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Renchun Yang - One of the best experts on this subject based on the ideXlab platform.
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synthesis of nax zeolite influence of crystallization time temperature and batch Molar Ratio sio2 al2o3 on the particulate properties of zeolite crystals
Powder Technology, 2013Co-Authors: Xu Zhang, Dingxing Tang, Min Zhang, Renchun YangAbstract:Abstract In this study, the effects of crystallization time, temperature and SiO 2 /Al 2 O 3 Molar Ratio in the synthesis gel on the end products (NaX zeolite) were investigated. The results revealed that crystallization time and temperature determined whether or not NaX zeolite was formed. Furthermore, SiO 2 /Al 2 O 3 Molar Ratio was found to play a significant role in the particulate properties of the crystalline end products. A single phase NaX zeolite was obtained only with the SiO 2 /Al 2 O 3 Molar Ratio of 1.5–4.0; the NaA zeolite was developed at SiO 2 /Al 2 O 3 = 1.0 in addition to the NaX zeolite. However, at SiO 2 /Al 2 O 3 = 0.5, a single phase NaA zeolite was generated. The Si/Al Molar Ratios of NaX zeolites were tested to be 1.38, 1.33, 1.29, 1.24 and 1.18 for the SiO 2 /Al 2 O 3 Molar Ratios of 4.0, 3.5, 2.9, 2.0 and 1.5. The corresponding samples had the mean particle sizes of 464, 548, 689, 836 and 980 nm, with the particle size distribution ranges of 120–810, 202–815, 445–975, 605–1096 and 770–1218 nm, respectively. N 2 adsorption–desorption results showed that the BET surface areas and micropore volume of the end product increased with the decrease of SiO 2 /Al 2 O 3 Molar Ratio in synthesis gel, but all the NaX zeolite particles have relatively high total pore volumes. In addition, the effect of Molar Ratio of SiO 2 /Al 2 O 3 on the amount of NaX zeolite formed in the products was also considered.
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Synthesis of NaX zeolite: Influence of crystallization time, temperature and batch Molar Ratio SiO2/Al2O3 on the particulate properties of zeolite crystals
Powder Technology, 2013Co-Authors: Xu Zhang, Dingxing Tang, Min Zhang, Renchun YangAbstract:In this study, the effects of crystallization time, temperature and SiO2/Al2O3 Molar Ratio in the synthesis gel on the end products (NaX zeolite) were investigated. The results revealed that crystallization time and temperature determined whether or not NaX zeolite was formed. Furthermore, SiO2/Al2O3 Molar Ratio was found to play a significant role in the particulate properties of the crystalline end products. A single phase NaX zeolite was obtained only with the SiO2/Al2O3 Molar Ratio of 1.5-4.0; the NaA zeolite was developed at SiO2/Al2O3=1.0 in addition to the NaX zeolite. However, at SiO2/Al2O3=0.5, a single phase NaA zeolite was generated. The Si/Al Molar Ratios of NaX zeolites were tested to be 1.38, 1.33, 1.29, 1.24 and 1.18 for the SiO2/Al2O3 Molar Ratios of 4.0, 3.5, 2.9, 2.0 and 1.5. The corresponding samples had the mean particle sizes of 464, 548, 689, 836 and 980nm, with the particle size distribution ranges of 120-810, 202-815, 445-975, 605-1096 and 770-1218nm, respectively. N2 adsorption-desorption results showed that the BET surface areas and micropore volume of the end product increased with the decrease of SiO2/Al2O3 Molar Ratio in synthesis gel, but all the NaX zeolite particles have relatively high total pore volumes. In addition, the effect of Molar Ratio of SiO2/Al2O3 on the amount of NaX zeolite formed in the products was also considered. © 2012 Elsevier B.V.
In Kyu Song - One of the best experts on this subject based on the ideXlab platform.
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elevated temperature co2 capture on nano structured mgo al2o3 aerogel effect of mg al Molar Ratio
Chemical Engineering Journal, 2014Co-Authors: Y Bang, Hyuk Jae Kwon, Vishwanath Hiremath, In Kyu SongAbstract:Abstract Nano-structured MgO–Al2O3 aerogel adsorbents (denoted as MgAl-AE-X) with different Mg/Al Molar Ratio (X) were prepared by a single-step epoxide-driven sol–gel method and a subsequent CO2 supercritical drying method. The effect of Mg/Al Molar Ratio of nano-structured MgO–Al2O3 aerogel adsorbents on their physicochemical properties and CO2 adsorptive performance at elevated temperature (200 °C) was investigated. Successful formation of flower-like nano-structured MgAl-AE-X adsorbents was confirmed by N2 adsorption–desorption isotherms and SEM analyses. The crystalline structure of MgAl-AE-X adsorbents was transformed in the sequence of Al2O3 → MgAl2O4 → MgO-MgAl2O4 with increasing Mg/Al Molar Ratio from 0 to 3. All the MgAl-AE-X adsorbents were found to possess weak base site and medium base site except for strong base site. In the dynamic CO2 adsorption, both the total CO2 capacity and the 90% breakthrough CO2 capacity showed volcano-shaped curves with respect to Mg/Al Molar Ratio, and they were decreased in the order of MgAl-AE-0.5 > MgAl-AE-1.0 > MgAl-AE-2.0 > MgAl-AE-3.0 > MgAl-AE-0. It was found that the 90% breakthrough CO2 capacity increased with increasing medium basicity of the adsorbents. Among the adsorbents tested, MgAl-AE-0.5 (Mg/Al = 0.5) adsorbent with the highest medium basicity showed the best CO2 adsorptive performance. Thus, medium basicity of nano-structured MgO–Al2O3 aerogel adsorbents served as a crucial factor in determining CO2 adsorptive performance at elevated flue gas temperature (200 °C).
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hydrogen production by steam reforming of ethanol over mesoporous ni al2o3 zro2 xerogel catalysts effect of zr al Molar Ratio
International Journal of Hydrogen Energy, 2013Co-Authors: Y Bang, In Kyu SongAbstract:Abstract A series of mesoporous Ni–Al 2 O 3 –ZrO 2 xerogel catalysts (denoted as Ni-AZ- X ) with different Zr/Al Molar Ratio (X) were prepared by a single-step epoxide-driven sol–gel method, and they were applied to the hydrogen production by steam reforming of ethanol. The effect of Zr/Al Molar Ratio of Ni-AZ- X catalysts on their physicochemical properties and catalytic activities was investigated. Textural and chemical properties of Ni-AZ- X catalysts were strongly influenced by Zr/Al Molar Ratio. Surface area of Ni-AZ- X catalysts decreased with increasing Zr/Al Molar Ratio due to the lattice contraction of ZrO 2 caused by the incorpoRation of Al 3+ into ZrO 2 . Interaction between nickel oxide species and support (Al 2 O 3 –ZrO 2 ) decreased with increasing Zr/Al Molar Ratio through the formation of NiO–Al 2 O 3 –ZrO 2 composite structure. Acidity of reduced Ni-AZ- X catalysts decreased with increasing Zr/Al Molar Ratio due to the loss of acid sites of Al 2 O 3 by the addition of ZrO 2 . Acidity of Ni-AZ- X catalysts served as a crucial factor determining the catalytic performance in the steam reforming of ethanol; an optimal acidity was required for maximum production of hydrogen. Among the catalysts tested, Ni-AZ-0.2 (Zr/Al = 0.2) catalyst with an intermediate acidity exhibited the best catalytic performance in the steam reforming of ethanol.
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hydrogen production by auto thermal reforming of ethanol over nickel catalysts supported on ce modified mesoporous zirconia effect of ce zr Molar Ratio
International Journal of Hydrogen Energy, 2008Co-Authors: Min Hye Youn, Sunyoung Park, Dong Ryul Park, Ji Chul Jung, In Kyu SongAbstract:Abstract Ce-modified mesoporous zirconia (Zr–Ce- X ) supports were prepared by a templating sol–gel method with a variation of Ce/Zr Molar Ratio ( X ). 20 wt% Ni catalysts supported on Zr–Ce- X ( X = 0, 0.1, 0.3, 0.5, 0.7, and 0.9) were then prepared by an incipient wetness impregnation method for use in hydrogen production by auto-thermal reforming of ethanol. The effect of Ce/Zr Molar Ratio ( X ) on the catalytic performance of Ni/Zr–Ce- X ( X = 0, 0.1, 0.3, 0.5, 0.7, and 0.9) catalysts was investigated. All the Ni/Zr–Ce- X ( X = 0, 0.1, 0.3, 0.5, 0.7, and 0.9) catalysts exhibited complete conversion of ethanol at 500 °C, while product distributions over the catalysts were different depending on the Ce/Zr Molar Ratio ( X ). Hydrogen selectivity over Ni/Zr–Ce- X ( X = 0, 0.1, 0.3, 0.5, 0.7, and 0.9) catalysts showed a volcano-shaped curve with respect to Ce/Zr Molar Ratio ( X ). Among the catalysts tested, Ni/Zr–Ce-0.7 showed the best catalytic performance in hydrogen production by auto-thermal reforming of ethanol.
Xu Zhang - One of the best experts on this subject based on the ideXlab platform.
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synthesis of nax zeolite influence of crystallization time temperature and batch Molar Ratio sio2 al2o3 on the particulate properties of zeolite crystals
Powder Technology, 2013Co-Authors: Xu Zhang, Dingxing Tang, Min Zhang, Renchun YangAbstract:Abstract In this study, the effects of crystallization time, temperature and SiO 2 /Al 2 O 3 Molar Ratio in the synthesis gel on the end products (NaX zeolite) were investigated. The results revealed that crystallization time and temperature determined whether or not NaX zeolite was formed. Furthermore, SiO 2 /Al 2 O 3 Molar Ratio was found to play a significant role in the particulate properties of the crystalline end products. A single phase NaX zeolite was obtained only with the SiO 2 /Al 2 O 3 Molar Ratio of 1.5–4.0; the NaA zeolite was developed at SiO 2 /Al 2 O 3 = 1.0 in addition to the NaX zeolite. However, at SiO 2 /Al 2 O 3 = 0.5, a single phase NaA zeolite was generated. The Si/Al Molar Ratios of NaX zeolites were tested to be 1.38, 1.33, 1.29, 1.24 and 1.18 for the SiO 2 /Al 2 O 3 Molar Ratios of 4.0, 3.5, 2.9, 2.0 and 1.5. The corresponding samples had the mean particle sizes of 464, 548, 689, 836 and 980 nm, with the particle size distribution ranges of 120–810, 202–815, 445–975, 605–1096 and 770–1218 nm, respectively. N 2 adsorption–desorption results showed that the BET surface areas and micropore volume of the end product increased with the decrease of SiO 2 /Al 2 O 3 Molar Ratio in synthesis gel, but all the NaX zeolite particles have relatively high total pore volumes. In addition, the effect of Molar Ratio of SiO 2 /Al 2 O 3 on the amount of NaX zeolite formed in the products was also considered.
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Synthesis of NaX zeolite: Influence of crystallization time, temperature and batch Molar Ratio SiO2/Al2O3 on the particulate properties of zeolite crystals
Powder Technology, 2013Co-Authors: Xu Zhang, Dingxing Tang, Min Zhang, Renchun YangAbstract:In this study, the effects of crystallization time, temperature and SiO2/Al2O3 Molar Ratio in the synthesis gel on the end products (NaX zeolite) were investigated. The results revealed that crystallization time and temperature determined whether or not NaX zeolite was formed. Furthermore, SiO2/Al2O3 Molar Ratio was found to play a significant role in the particulate properties of the crystalline end products. A single phase NaX zeolite was obtained only with the SiO2/Al2O3 Molar Ratio of 1.5-4.0; the NaA zeolite was developed at SiO2/Al2O3=1.0 in addition to the NaX zeolite. However, at SiO2/Al2O3=0.5, a single phase NaA zeolite was generated. The Si/Al Molar Ratios of NaX zeolites were tested to be 1.38, 1.33, 1.29, 1.24 and 1.18 for the SiO2/Al2O3 Molar Ratios of 4.0, 3.5, 2.9, 2.0 and 1.5. The corresponding samples had the mean particle sizes of 464, 548, 689, 836 and 980nm, with the particle size distribution ranges of 120-810, 202-815, 445-975, 605-1096 and 770-1218nm, respectively. N2 adsorption-desorption results showed that the BET surface areas and micropore volume of the end product increased with the decrease of SiO2/Al2O3 Molar Ratio in synthesis gel, but all the NaX zeolite particles have relatively high total pore volumes. In addition, the effect of Molar Ratio of SiO2/Al2O3 on the amount of NaX zeolite formed in the products was also considered. © 2012 Elsevier B.V.
Min Zhang - One of the best experts on this subject based on the ideXlab platform.
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Influences of the concentRation and the Molar Ratio of mixed surfactants on the performance of vesicle pseudostationary phase.
Electrophoresis, 2018Co-Authors: Lingling Jiang, Xinjiong Ni, Min ZhangAbstract:: In our previous work, it was found that the vesicles were formed spontaneously by mixing octyltriethylammonium bromide (C8 NE3 Br) with sodium dodecyl benzene sulfonate (SDBS), and the vesicles have been developed as a pseudostationary phase (PSP) in EKC. In the present work, the effects of the concentRation and the Molar Ratio of cationic to anionic surfactant on the vesicle properties and the performances of vesicle PSP in EKC have been investigated. The aggregates at all mixing Ratio were negatively charged regardless of which surfactant surplus. As C8 NE3 Br proportion increased, the microviscosity of the vesicle became larger. With the increase in the total surfactant concentRation, the migRation time window broadened at the Molar Ratio of C8 NE3 Br to SDBS of 3:7. Unexpectedly, the window became narrowed at Molar Ratio of 5:5 and 6:4. However, the methylene selectivity of vesicle PSP at all above-mentioned Molar Ratios enhanced as the total surfactant concentRation increased, no matter whether the migRation time window enlarged or narrowed. It implied that the vesicle PSP at Molar Ratio of 5:5 and 6:4 made it possible to obtain a better sepaRation in a shorter time. When the total surfactant concentRation was fixed at 20 mM, the methylene selectivity of the vesicle PSP of Molar Ratio of 5:5 was comparable to that of 3:7, but the migRation time shortened by a half.
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synthesis of nax zeolite influence of crystallization time temperature and batch Molar Ratio sio2 al2o3 on the particulate properties of zeolite crystals
Powder Technology, 2013Co-Authors: Xu Zhang, Dingxing Tang, Min Zhang, Renchun YangAbstract:Abstract In this study, the effects of crystallization time, temperature and SiO 2 /Al 2 O 3 Molar Ratio in the synthesis gel on the end products (NaX zeolite) were investigated. The results revealed that crystallization time and temperature determined whether or not NaX zeolite was formed. Furthermore, SiO 2 /Al 2 O 3 Molar Ratio was found to play a significant role in the particulate properties of the crystalline end products. A single phase NaX zeolite was obtained only with the SiO 2 /Al 2 O 3 Molar Ratio of 1.5–4.0; the NaA zeolite was developed at SiO 2 /Al 2 O 3 = 1.0 in addition to the NaX zeolite. However, at SiO 2 /Al 2 O 3 = 0.5, a single phase NaA zeolite was generated. The Si/Al Molar Ratios of NaX zeolites were tested to be 1.38, 1.33, 1.29, 1.24 and 1.18 for the SiO 2 /Al 2 O 3 Molar Ratios of 4.0, 3.5, 2.9, 2.0 and 1.5. The corresponding samples had the mean particle sizes of 464, 548, 689, 836 and 980 nm, with the particle size distribution ranges of 120–810, 202–815, 445–975, 605–1096 and 770–1218 nm, respectively. N 2 adsorption–desorption results showed that the BET surface areas and micropore volume of the end product increased with the decrease of SiO 2 /Al 2 O 3 Molar Ratio in synthesis gel, but all the NaX zeolite particles have relatively high total pore volumes. In addition, the effect of Molar Ratio of SiO 2 /Al 2 O 3 on the amount of NaX zeolite formed in the products was also considered.
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Synthesis of NaX zeolite: Influence of crystallization time, temperature and batch Molar Ratio SiO2/Al2O3 on the particulate properties of zeolite crystals
Powder Technology, 2013Co-Authors: Xu Zhang, Dingxing Tang, Min Zhang, Renchun YangAbstract:In this study, the effects of crystallization time, temperature and SiO2/Al2O3 Molar Ratio in the synthesis gel on the end products (NaX zeolite) were investigated. The results revealed that crystallization time and temperature determined whether or not NaX zeolite was formed. Furthermore, SiO2/Al2O3 Molar Ratio was found to play a significant role in the particulate properties of the crystalline end products. A single phase NaX zeolite was obtained only with the SiO2/Al2O3 Molar Ratio of 1.5-4.0; the NaA zeolite was developed at SiO2/Al2O3=1.0 in addition to the NaX zeolite. However, at SiO2/Al2O3=0.5, a single phase NaA zeolite was generated. The Si/Al Molar Ratios of NaX zeolites were tested to be 1.38, 1.33, 1.29, 1.24 and 1.18 for the SiO2/Al2O3 Molar Ratios of 4.0, 3.5, 2.9, 2.0 and 1.5. The corresponding samples had the mean particle sizes of 464, 548, 689, 836 and 980nm, with the particle size distribution ranges of 120-810, 202-815, 445-975, 605-1096 and 770-1218nm, respectively. N2 adsorption-desorption results showed that the BET surface areas and micropore volume of the end product increased with the decrease of SiO2/Al2O3 Molar Ratio in synthesis gel, but all the NaX zeolite particles have relatively high total pore volumes. In addition, the effect of Molar Ratio of SiO2/Al2O3 on the amount of NaX zeolite formed in the products was also considered. © 2012 Elsevier B.V.
Dingxing Tang - One of the best experts on this subject based on the ideXlab platform.
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synthesis of nax zeolite influence of crystallization time temperature and batch Molar Ratio sio2 al2o3 on the particulate properties of zeolite crystals
Powder Technology, 2013Co-Authors: Xu Zhang, Dingxing Tang, Min Zhang, Renchun YangAbstract:Abstract In this study, the effects of crystallization time, temperature and SiO 2 /Al 2 O 3 Molar Ratio in the synthesis gel on the end products (NaX zeolite) were investigated. The results revealed that crystallization time and temperature determined whether or not NaX zeolite was formed. Furthermore, SiO 2 /Al 2 O 3 Molar Ratio was found to play a significant role in the particulate properties of the crystalline end products. A single phase NaX zeolite was obtained only with the SiO 2 /Al 2 O 3 Molar Ratio of 1.5–4.0; the NaA zeolite was developed at SiO 2 /Al 2 O 3 = 1.0 in addition to the NaX zeolite. However, at SiO 2 /Al 2 O 3 = 0.5, a single phase NaA zeolite was generated. The Si/Al Molar Ratios of NaX zeolites were tested to be 1.38, 1.33, 1.29, 1.24 and 1.18 for the SiO 2 /Al 2 O 3 Molar Ratios of 4.0, 3.5, 2.9, 2.0 and 1.5. The corresponding samples had the mean particle sizes of 464, 548, 689, 836 and 980 nm, with the particle size distribution ranges of 120–810, 202–815, 445–975, 605–1096 and 770–1218 nm, respectively. N 2 adsorption–desorption results showed that the BET surface areas and micropore volume of the end product increased with the decrease of SiO 2 /Al 2 O 3 Molar Ratio in synthesis gel, but all the NaX zeolite particles have relatively high total pore volumes. In addition, the effect of Molar Ratio of SiO 2 /Al 2 O 3 on the amount of NaX zeolite formed in the products was also considered.
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Synthesis of NaX zeolite: Influence of crystallization time, temperature and batch Molar Ratio SiO2/Al2O3 on the particulate properties of zeolite crystals
Powder Technology, 2013Co-Authors: Xu Zhang, Dingxing Tang, Min Zhang, Renchun YangAbstract:In this study, the effects of crystallization time, temperature and SiO2/Al2O3 Molar Ratio in the synthesis gel on the end products (NaX zeolite) were investigated. The results revealed that crystallization time and temperature determined whether or not NaX zeolite was formed. Furthermore, SiO2/Al2O3 Molar Ratio was found to play a significant role in the particulate properties of the crystalline end products. A single phase NaX zeolite was obtained only with the SiO2/Al2O3 Molar Ratio of 1.5-4.0; the NaA zeolite was developed at SiO2/Al2O3=1.0 in addition to the NaX zeolite. However, at SiO2/Al2O3=0.5, a single phase NaA zeolite was generated. The Si/Al Molar Ratios of NaX zeolites were tested to be 1.38, 1.33, 1.29, 1.24 and 1.18 for the SiO2/Al2O3 Molar Ratios of 4.0, 3.5, 2.9, 2.0 and 1.5. The corresponding samples had the mean particle sizes of 464, 548, 689, 836 and 980nm, with the particle size distribution ranges of 120-810, 202-815, 445-975, 605-1096 and 770-1218nm, respectively. N2 adsorption-desorption results showed that the BET surface areas and micropore volume of the end product increased with the decrease of SiO2/Al2O3 Molar Ratio in synthesis gel, but all the NaX zeolite particles have relatively high total pore volumes. In addition, the effect of Molar Ratio of SiO2/Al2O3 on the amount of NaX zeolite formed in the products was also considered. © 2012 Elsevier B.V.
