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Takao Kimura - One of the best experts on this subject based on the ideXlab platform.

  • 115 The development of sulfated zirconium oxide catalyst for isomerization of Light Naphtha
    Studies in Surface Science and Catalysis, 2007
    Co-Authors: Takao Kimura
    Abstract:

    Abstract Platinum loaded sulfated zirconium oxide catalyst (Pt/SO42−/ZrO2) for the isomerization of Light Naphtha was found in the joint research between Cosmo Oil Co., Ltd. and Mitsubishi Heavy Industries, Ltd. in 1983. After the license from us, UOP LLC has developed ommercial isomerization process for Light Naphthal using Pt/SO42−/ZrO2 catalyst. This novel catalyst has not only lower temperature activites than that of zeolite-based catalysts but also less sensitive to water in the feed oil than that of chlorided-alumina based catalysts. The first commercial operation using the developed catalyst had started in USA in the end of 1996. The developed catalyst revealed 25% increasing of throughput of isomerate and the increasing of its RON compare to former zeolite catalyst at the existing isomerization process-xb[1]

  • Effect of metals on the catalytic activity of sulfated zirconia for Light Naphtha isomerization
    Catalysis Surveys from Asia, 2005
    Co-Authors: Katsuya Watanabe, Takahito Kawakami, Koji Baba, Nobuyasu Oshio, Takao Kimura
    Abstract:

    We studied on the function of the metal in the sulfated zirconia(SO _4 ^2− /ZrO_2) catalyst for the isomerization reaction of Light paraffins. The addition of Pt to the SO _4 ^2− /ZrO_2 carrier could keep the high catalytic activity. The improvement in this isomerization activity is because Pt promotes removal of the coke precursor deposited on the catalyst surface. Though this catalytic function was observed in other transition metals, such as Pd, Ru, Ni, Rh and W, Pt exhibited the highest effect among them. It was further found that the Pd/SO _4 ^2− /ZrO_2–Al_2O_3 catalyst possessed a catalytic function for desulfurization of sulfur-containing Light Naphtha in addition to the skeletal isomerization. The sulfur tolerance of catalyst depended on the method of adding Pd, and the catalyst prepared by impregnation of the SO _4 ^2− /ZrO_2–Al_2O_3 with an aqueous solution of Pd exhibited the highest sulfur tolerance. Further, we investigated the improvement in sulfur tolerance of the Pt/SO _4 ^2− /ZrO_2–Al_2O_3 catalyst by impregnation of Pd. The results of EPMA analysis indicated that this catalyst was a hybrid-type one (Pt/SO _4 ^2− /ZrO_2–Pd/Al_2O_3) in which Pt/SO _4 ^2− /ZrO_2 particles and Pd/Al_2O_3 particles adjoined closely. This hybrid catalyst possessed a very high sulfur tolerance to the raw Light Naphtha that was obtained from the atmospheric distillation apparatus, although this Light Naphtha contained much sulfur. We assume that such a high sulfur tolerance in the hybrid catalyst is brought about by the isomerization function of Pt/SO _4 ^2− /ZrO_2 particles and the hydrodesulfurization function of Pd/Al_2O_3 particles. Besides, since the hybrid catalyst also provides high catalytic activity in the isomerization of HDS Light Naphtha, we suggest that the Pd/Al_2O_3 particles supply atomic hydrogen to the Pt/SO _4 ^2− /ZrO_2 particles by homolytic dissociation of gaseous hydrogen and also enhance the sulfur tolerance of Pt/SO _4 ^2− /ZrO_2 particles. Finally, we also propose the most suitable location of Pd and Pt in the metal-supported SO _4 ^2− /ZrO_2–Al_2O_3 catalyst.

  • Simultaneous isomerization and desulfurization of sulfur-containing Light Naphtha over metal/SO42−/ZrO2-Al2O3 catalyst
    Applied Catalysis A-general, 2004
    Co-Authors: Watanabe Katsuya, Takahito Kawakami, Koji Baba, Nobuyasu Oshio, Takao Kimura
    Abstract:

    Abstract The isomerization reaction of sulfur-containing Light Naphtha was studied. The Pd/SO 4 2− /ZrO 2 -Al 2 O 3 catalyst in which the active metal was modified into Pd indicates the stable isomerization activity, although the isomerization activity of the conventional Pt/SO 4 2− /ZrO 2 -Al 2 O 3 catalyst decreases due to the existence of sulfur in the feed. But the increase of sulfur content in feed caused a drop of the isomerization level over Pd/SO 4 2− /ZrO 2 -Al 2 O 3 catalyst. The increase in the amount of sulfur supplied to the catalyst invites the increase of the amount of Pd required for a desulfurization reaction, and leads to the decrease in the relative amount of Pd that performs the homogeneous dissociation of gaseous hydrogen. By preparing the catalysts so that the methods of the Pd addition are different, one could study the correlation between the position of Pd in SO 4 2− /ZrO 2 -Al 2 O 3 carrier and the isomerization activity. The catalyst, which forms Pd/Al 2 O 3 shows the highest isomerization activity. This fact suggests that the optimal position of Pd in SO 4 2− /ZrO 2 -Al 2 O 3 carrier is on Al 2 O 3 and that the high desulfurization function is obtained by the formation of Pd/Al 2 O 3 . Furthermore, we researched about a catalyst that would work effectively in the isomerization of Light Naphtha, which contains sulfur in high concentrations. The catalyst where Pd is impregnated into Pt/SO 4 2− /ZrO 2 -Al 2 O 3 can obtain the stably high activity in the isomerization of Light Naphtha that contains sulfur of 490 massppm at a reaction temperature of 200 °C. The results of EPMA analysis indicate that this catalyst forms a unique hybrid structure where Pt exists on zirconia and Pd exists on alumina, respectively. The high sulfur tolerance of hybrid-type catalyst is brought about by the isomerization function of Pt/SO 4 2− /ZrO 2 particles and the hydrodesulfurization function of Pd/Al 2 O 3 particles. We propose a model of the optimal metal position for the isomerization of Light Naphtha, which contains sulfur in high concentration, and we consider more deeply about the catalytic action of the hybrid-type catalyst.

  • simultaneous isomerization and desulfurization of sulfur containing Light Naphtha over metal so42 zro2 al2o3 catalyst
    Applied Catalysis A-general, 2004
    Co-Authors: Katsuya Watanabe, Takahito Kawakami, Koji Baba, Nobuyasu Oshio, Takao Kimura
    Abstract:

    Abstract The isomerization reaction of sulfur-containing Light Naphtha was studied. The Pd/SO 4 2− /ZrO 2 -Al 2 O 3 catalyst in which the active metal was modified into Pd indicates the stable isomerization activity, although the isomerization activity of the conventional Pt/SO 4 2− /ZrO 2 -Al 2 O 3 catalyst decreases due to the existence of sulfur in the feed. But the increase of sulfur content in feed caused a drop of the isomerization level over Pd/SO 4 2− /ZrO 2 -Al 2 O 3 catalyst. The increase in the amount of sulfur supplied to the catalyst invites the increase of the amount of Pd required for a desulfurization reaction, and leads to the decrease in the relative amount of Pd that performs the homogeneous dissociation of gaseous hydrogen. By preparing the catalysts so that the methods of the Pd addition are different, one could study the correlation between the position of Pd in SO 4 2− /ZrO 2 -Al 2 O 3 carrier and the isomerization activity. The catalyst, which forms Pd/Al 2 O 3 shows the highest isomerization activity. This fact suggests that the optimal position of Pd in SO 4 2− /ZrO 2 -Al 2 O 3 carrier is on Al 2 O 3 and that the high desulfurization function is obtained by the formation of Pd/Al 2 O 3 . Furthermore, we researched about a catalyst that would work effectively in the isomerization of Light Naphtha, which contains sulfur in high concentrations. The catalyst where Pd is impregnated into Pt/SO 4 2− /ZrO 2 -Al 2 O 3 can obtain the stably high activity in the isomerization of Light Naphtha that contains sulfur of 490 massppm at a reaction temperature of 200 °C. The results of EPMA analysis indicate that this catalyst forms a unique hybrid structure where Pt exists on zirconia and Pd exists on alumina, respectively. The high sulfur tolerance of hybrid-type catalyst is brought about by the isomerization function of Pt/SO 4 2− /ZrO 2 particles and the hydrodesulfurization function of Pd/Al 2 O 3 particles. We propose a model of the optimal metal position for the isomerization of Light Naphtha, which contains sulfur in high concentration, and we consider more deeply about the catalytic action of the hybrid-type catalyst.

  • Development of Pt/SO42-/ZrO2 catalyst for isomerization of Light Naphtha
    Catalysis Today, 2003
    Co-Authors: Takao Kimura
    Abstract:

    Abstract Platinum-loaded sulfated zirconium oxide catalyst (Pt/SO42−/ZrO2) for isomerization of Light Naphtha had been developed through the joint research between Cosmo Oil Co., Ltd., and Mitsubishi Heavy Industries, Ltd., in 1983. The role of small amount of noble metal in this novel catalyst is presented. Platinum improved catalyst stability by preventing formation of coke precursors on strong acid site of sulfated zirconium. After the collaboration for commercialization of this catalyst with UOP LLC for many years, we had reached to a success of the first commercial operation for Naphtha isomerization catalysts in 1996. The expected performance and stability during the commercial operation of Par-Isom have been obtained.

Chems Eddine Chitour - One of the best experts on this subject based on the ideXlab platform.

  • Palladium–sulfated zirconium pillared montmorillonite: Catalytic evaluation in Light Naphtha hydroisomerization reaction
    Catalysis Today, 2006
    Co-Authors: Rachid Issaadi, François Garin, Chems Eddine Chitour
    Abstract:

    Abstract The present work is an evaluation of 1 wt.% Pd/sulfated zirconium pillared montmorillonite catalyst in the hydroisomerization reaction of two fractions of Light Naphtha composed mainly of C 5 and C 6 paraffins (feeds 1 and 2). Catalyst activity test was carried out in a fixed-bed flow reactor at reaction temperature of 300 °C, under atmospheric hydrogen pressure and weight hourly space velocity of 0.825 h −1 . The reaction products showed high isomer and cyclane selectivity. Monobranched and multibranched isomers were formed as well as C5 and C6 cyclane products. After the catalytic reaction, the total amount of benzene and cyclohexane decreased by 30% for the “feed 1” and by 40% for the “feed 2” leading to methylcyclopentane formation in the products. A long-term performance test catalyst for the two Light Naphtha fractions was also performed and we observed an improving of the research octane number (RON) by 15–17 for, respectively, feeds 1 and 2.

  • palladium sulfated zirconium pillared montmorillonite catalytic evaluation in Light Naphtha hydroisomerization reaction
    Catalysis Today, 2006
    Co-Authors: Rachid Issaadi, François Garin, Chems Eddine Chitour
    Abstract:

    Abstract The present work is an evaluation of 1 wt.% Pd/sulfated zirconium pillared montmorillonite catalyst in the hydroisomerization reaction of two fractions of Light Naphtha composed mainly of C 5 and C 6 paraffins (feeds 1 and 2). Catalyst activity test was carried out in a fixed-bed flow reactor at reaction temperature of 300 °C, under atmospheric hydrogen pressure and weight hourly space velocity of 0.825 h −1 . The reaction products showed high isomer and cyclane selectivity. Monobranched and multibranched isomers were formed as well as C5 and C6 cyclane products. After the catalytic reaction, the total amount of benzene and cyclohexane decreased by 30% for the “feed 1” and by 40% for the “feed 2” leading to methylcyclopentane formation in the products. A long-term performance test catalyst for the two Light Naphtha fractions was also performed and we observed an improving of the research octane number (RON) by 15–17 for, respectively, feeds 1 and 2.

Binbin Bao - One of the best experts on this subject based on the ideXlab platform.

  • effect of selective oxidation and sulphur phosphorus containing compounds on coking behaviour during Light Naphtha thermal cracking
    Canadian Journal of Chemical Engineering, 2017
    Co-Authors: Binbin Bao, Jinglei Liu, Shun Wan, Weifeng Zhang
    Abstract:

    The investigation was aimed at evaluating the effect of selective oxidation and sulphur/phosphorus-containing compounds on coking behaviour at the surface of HP40 alloy during thermal cracking of Light Naphtha. The surface morphology and composition of the selectively oxidized alloy were characterized by SEM, EDX, and XRD. Coking tests show that the coking rate of blank alloy decreased with sulphur/phosphorus-containing compounds, while the effect of sulphur/phosphorus-containing compounds on coking rate for selectively oxidized alloy is complex, and a mass concentration of µg/g results in the lowest coking rate. The morphology and microstructure of cokes were investigated by SEM and Raman spectra. SEM and Raman spectra analyses indicated that either selective oxidation or sulphur/phosphorus-containing compounds resulted in more disordered graphite structures and amorphous carbon.

  • Anti-coking Effect of MnCr2O4 Spinel Coating during Light Naphtha Thermal Cracking
    Energy Procedia, 2017
    Co-Authors: Binbin Bao, Zhiyuan Wang, Jinglei Liu
    Abstract:

    Abstract The research aimed at fabricating MnCr 2 O 4 spinel coating on HP 40 alloy, and evaluating the influence of the spinel coating on coking behavior during thermal cracking of Light Naphtha. MnCr 2 O 4 spinel coating formed on the alloy surface by selectively oxidized under low oxygen partial pressure atmosphere at 1050 o C for 20 h. The as-formed spinel coating was characterized by scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD). The results show that the spinel scale is uniform and compact, with blade-like structures on the top. The coking behavior was studied from the morphology and microstructure of coke, and characterized by scanning electron microscope (SEM) and Raman spectra, respectively. The results show that, only globular coke presents on MnCr 2 O 4 spinel coating compared with blank alloy, and the coke exhibits more disordered graphite structures. Thus, the spinel scale has a favorable anti-coking property.

  • Investigation on Coking Performance with Sulfur / Phosphorous-containing Additive and Anti-coking SiO2/S Coating during Thermal Cracking of Light Naphtha
    Energy Procedia, 2017
    Co-Authors: Zhiyuan Wang, Binbin Bao
    Abstract:

    Abstract Coke deposits during thermal cracking of Light Naphtha in the presence of the sulfur/phosphorous-containing additive and the anti-coking SiO 2 /S coating were investigated. The structure of the coke layer was studied. The results show that the coke is more amorphous with the additive mass concentration of 200 μg.g -1 . The additive has altered the microstructure of the coke layer by effecting the dehydrogenation reaction during coke formation. Coke deposits on the SiO 2 /S coating prepared by atmosphere pressure chemical vapor deposition (APCVD) method are mainly composed of coke granules. The TGA results show that the coke deposits are mainly composed of a small amount of volatile coke and a large amount of hard coke. The results of the low H/C ratios show the highly condensed structure of the coke deposits. When additive is added, inorganic sulfur is mainly formed in the cokes based on the analysis of XPS spectra. Phosphorus in the cokes is in the form of PO 4 3- and phosphide species. The analyses of Raman spectra indicate that the coke deposits formed during thermal cracking are mainly composed of amorphous carbon. Cokes deposited on the SiO 2 /S coating are more disordered, which may make the decoking operation facilitated.

  • investigation on coking performance with sulfur phosphorous containing additive and anti coking sio2 s coating during thermal cracking of Light Naphtha
    Energy Procedia, 2017
    Co-Authors: Zhiyuan Wang, Binbin Bao
    Abstract:

    Abstract Coke deposits during thermal cracking of Light Naphtha in the presence of the sulfur/phosphorous-containing additive and the anti-coking SiO 2 /S coating were investigated. The structure of the coke layer was studied. The results show that the coke is more amorphous with the additive mass concentration of 200 μg.g -1 . The additive has altered the microstructure of the coke layer by effecting the dehydrogenation reaction during coke formation. Coke deposits on the SiO 2 /S coating prepared by atmosphere pressure chemical vapor deposition (APCVD) method are mainly composed of coke granules. The TGA results show that the coke deposits are mainly composed of a small amount of volatile coke and a large amount of hard coke. The results of the low H/C ratios show the highly condensed structure of the coke deposits. When additive is added, inorganic sulfur is mainly formed in the cokes based on the analysis of XPS spectra. Phosphorus in the cokes is in the form of PO 4 3- and phosphide species. The analyses of Raman spectra indicate that the coke deposits formed during thermal cracking are mainly composed of amorphous carbon. Cokes deposited on the SiO 2 /S coating are more disordered, which may make the decoking operation facilitated.

  • Inhibitory effect of MnCr2O4 spinel coating on coke formation during Light Naphtha thermal cracking
    RSC Advances, 2016
    Co-Authors: Binbin Bao, Jinglei Liu, Bo Liu, Weifeng Zhang
    Abstract:

    In this paper, MnCr2O4 spinel coating was fabricated on a HP40 alloy by pack cementation and subsequent thermal oxidation. The spinel coating was dense and uniform, and was applied to inhibit coke formation during Light Naphtha thermal cracking. Coking behaviors on the HP40 alloy and spinel coated alloy were compared under the same conditions. The anti-coking rate of the MnCr2O4 spinel coating exceeded 60% during Light Naphtha thermal cracking. Lots of filamentous coke formed on the uncoated HP40 alloy, but catalytic coke was completely inhibited on the MnCr2O4 spinel coated alloy resulting in a granular appearance of coke. Raman spectra analyses indicated that coke deposited on the surface of the spinel coating had a larger proportion of disordered carbon and amorphous carbon compared with that on the uncoated HP40 alloy.

Rachid Issaadi - One of the best experts on this subject based on the ideXlab platform.

  • Palladium–sulfated zirconium pillared montmorillonite: Catalytic evaluation in Light Naphtha hydroisomerization reaction
    Catalysis Today, 2006
    Co-Authors: Rachid Issaadi, François Garin, Chems Eddine Chitour
    Abstract:

    Abstract The present work is an evaluation of 1 wt.% Pd/sulfated zirconium pillared montmorillonite catalyst in the hydroisomerization reaction of two fractions of Light Naphtha composed mainly of C 5 and C 6 paraffins (feeds 1 and 2). Catalyst activity test was carried out in a fixed-bed flow reactor at reaction temperature of 300 °C, under atmospheric hydrogen pressure and weight hourly space velocity of 0.825 h −1 . The reaction products showed high isomer and cyclane selectivity. Monobranched and multibranched isomers were formed as well as C5 and C6 cyclane products. After the catalytic reaction, the total amount of benzene and cyclohexane decreased by 30% for the “feed 1” and by 40% for the “feed 2” leading to methylcyclopentane formation in the products. A long-term performance test catalyst for the two Light Naphtha fractions was also performed and we observed an improving of the research octane number (RON) by 15–17 for, respectively, feeds 1 and 2.

  • palladium sulfated zirconium pillared montmorillonite catalytic evaluation in Light Naphtha hydroisomerization reaction
    Catalysis Today, 2006
    Co-Authors: Rachid Issaadi, François Garin, Chems Eddine Chitour
    Abstract:

    Abstract The present work is an evaluation of 1 wt.% Pd/sulfated zirconium pillared montmorillonite catalyst in the hydroisomerization reaction of two fractions of Light Naphtha composed mainly of C 5 and C 6 paraffins (feeds 1 and 2). Catalyst activity test was carried out in a fixed-bed flow reactor at reaction temperature of 300 °C, under atmospheric hydrogen pressure and weight hourly space velocity of 0.825 h −1 . The reaction products showed high isomer and cyclane selectivity. Monobranched and multibranched isomers were formed as well as C5 and C6 cyclane products. After the catalytic reaction, the total amount of benzene and cyclohexane decreased by 30% for the “feed 1” and by 40% for the “feed 2” leading to methylcyclopentane formation in the products. A long-term performance test catalyst for the two Light Naphtha fractions was also performed and we observed an improving of the research octane number (RON) by 15–17 for, respectively, feeds 1 and 2.

Jianxin Zhou - One of the best experts on this subject based on the ideXlab platform.

  • Influence of the SiO2/S coating and sulfur/phosphorus-containing coking inhibitor on coke formation during thermal cracking of Light Naphtha
    Fuel Processing Technology, 2012
    Co-Authors: Jianxin Zhou, Xiaojian Luan, Xiang Ling
    Abstract:

    Abstract The influence of the SiO 2 /S coating + sulfur/phosphorus-containing inhibitor on coke formation on the surface of HP40 cracking tube after 8 years of service was evaluated at 850 °C during thermal cracking of Light Naphtha. The surface morphology of HP40 alloy specimen after 8 years of service was characterized by scanning electron microscope (SEM), energy dispersive spectrometry (EDS), and X-ray diffraction (XRD). The morphologies and structures of cokes were studied by SEM and Raman spectra. The results were compared with those of adding sulfur/phosphorus-containing coking inhibitor only and the blank run. Compared with the blank run, the amount of coke is decreased by about 69% by adding 200 ppm sulfur/phosphorus-containing coking inhibitor only. However, the amount of coke is decreased by about 96% for the SiO 2 /S coating + 50 ppm sulfur/phosphorus-containing coking inhibitor. The surface of HP40 specimen is fully covered by the filamentous coke for the blank run, and the filamentous coke forms around microcracks using 200 ppm sulfur/phosphorus-containing coking inhibitor only. However, a small amount of granular coke is formed using 50 ppm sulfur/phosphorus-containing coking inhibitor + the SiO 2 /S coating. Meanwhile, the coke includes more amorphous coke according to SEM analyses and Raman spectra.

  • influence of the sio2 s coating and sulfur phosphorus containing coking inhibitor on coke formation during thermal cracking of Light Naphtha
    Fuel Processing Technology, 2012
    Co-Authors: Jianxin Zhou, Xiaojian Luan, Xiang Ling
    Abstract:

    Abstract The influence of the SiO 2 /S coating + sulfur/phosphorus-containing inhibitor on coke formation on the surface of HP40 cracking tube after 8 years of service was evaluated at 850 °C during thermal cracking of Light Naphtha. The surface morphology of HP40 alloy specimen after 8 years of service was characterized by scanning electron microscope (SEM), energy dispersive spectrometry (EDS), and X-ray diffraction (XRD). The morphologies and structures of cokes were studied by SEM and Raman spectra. The results were compared with those of adding sulfur/phosphorus-containing coking inhibitor only and the blank run. Compared with the blank run, the amount of coke is decreased by about 69% by adding 200 ppm sulfur/phosphorus-containing coking inhibitor only. However, the amount of coke is decreased by about 96% for the SiO 2 /S coating + 50 ppm sulfur/phosphorus-containing coking inhibitor. The surface of HP40 specimen is fully covered by the filamentous coke for the blank run, and the filamentous coke forms around microcracks using 200 ppm sulfur/phosphorus-containing coking inhibitor only. However, a small amount of granular coke is formed using 50 ppm sulfur/phosphorus-containing coking inhibitor + the SiO 2 /S coating. Meanwhile, the coke includes more amorphous coke according to SEM analyses and Raman spectra.

  • anti coking property of the sio2 s coating during Light Naphtha steam cracking in a pilot plant setup
    Journal of Analytical and Applied Pyrolysis, 2011
    Co-Authors: Jianxin Zhou, Zhiyuan Wang, Xiaojian Luan, Hong Xu
    Abstract:

    Abstract On the basis of development in the laboratory, the SiO 2 /S coating was prepared on the internal surface of HK40 alloy tube in a pilot plant setup. The coating sampled on the outlet of furnace tube was characterized by scanning electron microscope (SEM). The anti-coking property of the SiO 2 /S coating was evaluated with Light Naphtha according to pressure changes. The morphologies and chemical components of cokes on the outlet of the coated and blank tubes were characterized by SEM and energy dispersive spectroscopy (EDS), respectively. The main product yields of Light Naphtha steam cracking were analyzed by gas chromatography–mass spectrometry (GC–MS). The results show that the SiO 2 /S coating is compact and has a thickness of 15 μm on the outlet of furnace tube. The SiO 2 /S coating reduces coke yield by 60% compared to that observed in the blank tube during 8 h cracking run. However, the coke reductions of the SiO 2 /S coating are both about 40% when the cracking time is 26 h and 66 h, respectively. The outlet of the coated tube has the exfoliated coke with a thickness of about 30 μm. The coke on the process side has many irregular particles, and the coke on the metal side is not filamentous coke but amorphous coke particles after the exfoliated coke is taken away. The yield of C 2 H 4 has a sLight increase in the coated tube, and the yield of C 4 H 8 has a decrease. However, the SiO 2 /S coating has little influence on the total yield of olefin.

  • Anti-coking property of the SiO2/S coating during Light Naphtha steam cracking in a pilot plant setup
    Journal of Analytical and Applied Pyrolysis, 2010
    Co-Authors: Jianxin Zhou, Zhiyuan Wang, Xiaojian Luan
    Abstract:

    Abstract On the basis of development in the laboratory, the SiO 2 /S coating was prepared on the internal surface of HK40 alloy tube in a pilot plant setup. The coating sampled on the outlet of furnace tube was characterized by scanning electron microscope (SEM). The anti-coking property of the SiO 2 /S coating was evaluated with Light Naphtha according to pressure changes. The morphologies and chemical components of cokes on the outlet of the coated and blank tubes were characterized by SEM and energy dispersive spectroscopy (EDS), respectively. The main product yields of Light Naphtha steam cracking were analyzed by gas chromatography–mass spectrometry (GC–MS). The results show that the SiO 2 /S coating is compact and has a thickness of 15 μm on the outlet of furnace tube. The SiO 2 /S coating reduces coke yield by 60% compared to that observed in the blank tube during 8 h cracking run. However, the coke reductions of the SiO 2 /S coating are both about 40% when the cracking time is 26 h and 66 h, respectively. The outlet of the coated tube has the exfoliated coke with a thickness of about 30 μm. The coke on the process side has many irregular particles, and the coke on the metal side is not filamentous coke but amorphous coke particles after the exfoliated coke is taken away. The yield of C 2 H 4 has a sLight increase in the coated tube, and the yield of C 4 H 8 has a decrease. However, the SiO 2 /S coating has little influence on the total yield of olefin.