The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
R. Le Van Mao - One of the best experts on this subject based on the ideXlab platform.
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Catalytic Compatibility of Methanol with Petroleum Naphtha in Mixed Feeds Used in the Thermal-Catalytic/Steam-Cracking (TCSC) Process for the Production of Propylene and Ethylene
Catalysis Letters, 2012Co-Authors: H. T. Yan, R. Le Van MaoAbstract:In the Thermal-Catalytic steam-cracking (TCSC) of “naphtha–methanol” mixtures, the increasing presence of methanol in the feed significantly modified the kinetics of the Catalytic cracking. The gradual and significant decrease of the apparent activation energy with increasing methanol concentration in the mixed feed was attributed to the effect of intensive interactions between the two types of molecules: hydrocarbons and methanol. The addition of methanol into petroleum naphtha feed, up to 25 wt%, did not significantly change the Catalytic performance of the TCSC hybrid nano-catalyst, suggesting that this catalyst could create at such relatively low methanol concentrations, a certain compatibility between the feed components. Graphical Abstract
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Mixed Naphtha/Methanol Feed Used in the Thermal Catalytic/Steam Cracking (TCSC) Process for the Production of Propylene and Ethylene
Catalysis Letters, 2010Co-Authors: H. T. Yan, R. Le Van MaoAbstract:The addition of some methanol to petroleum light naphtha used as feed in the Thermal Catalytic/Steam Cracking(TCSC) process significantly increases the product yield of C2–C4 olefins, particularly that of ethylene + propylene. However, over 20–25 wt% of methanol content in the naphtha feed, the beneficial effect is attenuated. At relatively high values of contact time, the (Zn–Pd) co-catalyst of the hybrid catalyst exerts noticeably its coke cleaning effect on the zeolite acid sites, particularly when methanol is present in the feed. The product weight ratio (propylene/ethylene) is not affected by such “moderate” addition of methanol and remains higher than 1.3.
H. T. Yan - One of the best experts on this subject based on the ideXlab platform.
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Catalytic Compatibility of Methanol with Petroleum Naphtha in Mixed Feeds Used in the Thermal-Catalytic/Steam-Cracking (TCSC) Process for the Production of Propylene and Ethylene
Catalysis Letters, 2012Co-Authors: H. T. Yan, R. Le Van MaoAbstract:In the Thermal-Catalytic steam-cracking (TCSC) of “naphtha–methanol” mixtures, the increasing presence of methanol in the feed significantly modified the kinetics of the Catalytic cracking. The gradual and significant decrease of the apparent activation energy with increasing methanol concentration in the mixed feed was attributed to the effect of intensive interactions between the two types of molecules: hydrocarbons and methanol. The addition of methanol into petroleum naphtha feed, up to 25 wt%, did not significantly change the Catalytic performance of the TCSC hybrid nano-catalyst, suggesting that this catalyst could create at such relatively low methanol concentrations, a certain compatibility between the feed components. Graphical Abstract
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Mixed Naphtha/Methanol Feed Used in the Thermal Catalytic/Steam Cracking (TCSC) Process for the Production of Propylene and Ethylene
Catalysis Letters, 2010Co-Authors: H. T. Yan, R. Le Van MaoAbstract:The addition of some methanol to petroleum light naphtha used as feed in the Thermal Catalytic/Steam Cracking(TCSC) process significantly increases the product yield of C2–C4 olefins, particularly that of ethylene + propylene. However, over 20–25 wt% of methanol content in the naphtha feed, the beneficial effect is attenuated. At relatively high values of contact time, the (Zn–Pd) co-catalyst of the hybrid catalyst exerts noticeably its coke cleaning effect on the zeolite acid sites, particularly when methanol is present in the feed. The product weight ratio (propylene/ethylene) is not affected by such “moderate” addition of methanol and remains higher than 1.3.
Seyed Mojtaba Sadrameli - One of the best experts on this subject based on the ideXlab platform.
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Thermal/Catalytic cracking of hydrocarbons for the production of olefins; a state-of-the-art review III: Process modeling and simulation
Fuel, 2019Co-Authors: Mohammad Fakhroleslam, Seyed Mojtaba SadrameliAbstract:Abstract Ethylene and propylene are among the light olefins which are the main building blocks in the petrochemical and chemical industry. They are produced from Thermal/Catalytic cracking of gaseous and liquid hydrocarbons and recently from methanol. This paper continues the two review articles published before entitled Thermal and Catalytic cracking of hydrocarbons for the production of light olefins. In the last two review articles, the processes and the kinetics of Thermal and Catalytic cracking have been discussed in details. This paper reviews the mathematical modeling and simulation of the olefin plants including mechanisms and kinetic models, CFD simulations, rigorous models, and abstract models.
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Thermal Catalytic cracking of liquid hydrocarbons for the production of olefins a state of the art review ii Catalytic cracking review
Fuel, 2016Co-Authors: Seyed Mojtaba SadrameliAbstract:Abstract Light olefins such as ethylene and propylene, are considered as main raw materials for the production of numerous plastic materials, synthesis fibers and rubbers in the petrochemical industry. The conventional process for the production of light olefins is Thermal cracking in the presence of steam called Steam Cracking (SC). This has been the main technology for the production of olefins for more than ninety years. This technology has reached to its full capacity and cannot accommodate excessive demands of the petrochemical industry although still 95% of the light olefins are produced by this technology. In addition there are a few drawbacks for this technology such as en extensive energy consumption, and production of greenhouse gasses. An alternative and promising route for the production of light olefins which consumes less energy and produces fewer pollutants to the environment is Thermal Catalytic Cracking (TCC). This paper reviews the main research works done on the process in the literature in the last five decades. An eight-lump mathematical model is presented for the Catalytic cracking kinetics. Some of the main experimental laboratory setup systems in the world have also been reviewed and parts of the results are presented and discussed.
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Thermal/Catalytic cracking of liquid hydrocarbons for the production of olefins: A state-of-the-art review II: Catalytic cracking review
Fuel, 2016Co-Authors: Seyed Mojtaba SadrameliAbstract:Light olefins such as ethylene and propylene, are considered as main raw materials for the production of numerous plastic materials, synthesis fibers and rubbers in the petrochemical industry. The conventional process for the production of light olefins is Thermal cracking in the presence of steam called Steam Cracking (SC). This has been the main technology for the production of olefins for more than ninety years. This technology has reached to its full capacity and cannot accommodate excessive demands of the petrochemical industry although still 95% of the light olefins are produced by this technology. In addition there are a few drawbacks for this technology such as en extensive energy consumption, and production of greenhouse gasses. An alternative and promising route for the production of light olefins which consumes less energy and produces fewer pollutants to the environment is Thermal Catalytic Cracking (TCC). This paper reviews the main research works done on the process in the literature in the last five decades. An eight-lump mathematical model is presented for the Catalytic cracking kinetics. Some of the main experimental laboratory setup systems in the world have also been reviewed and parts of the results are presented and discussed.
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Effect of process variables on product yield distribution in Thermal Catalytic cracking of naphtha to light olefins over Fe/HZSM-5
Korean Journal of Chemical Engineering, 2011Co-Authors: Mina Alyani, Jafar Towfighi, Seyed Mojtaba SadrameliAbstract:The effect of temperature, WHSV and Fe loading over HZSM-5 catalyst in Thermal-Catalytic cracking (TCC) of naphtha for the production of light olefins has been studied. The response surface defined by three most significant parameters is obtained from Box-Behnken design method and the optimal parameter set is found. The results show that ethylene increases with temperature, while propylene shows an optimum at 650 °C. Moderate WHSV is favorable for maximum production of light olefins. Addition of Fe to HZSM-5 has a favorable effect on the production of light olefins up to 6% of loading. Excess amount of loading decreases the conversion of naphtha, which leads to a drop in light olefin yields. The yield of light olefins (ethylene and propylene) at 670 °C, 44 hr^−1 and 6 wt% Fe has been increased to 5.43 wt% compared to the unmodified HZSM-5 and reaches to 42.47 wt%.
Hongpeng Jia - One of the best experts on this subject based on the ideXlab platform.
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Noble metal free, CeO2/LaMnO3 hybrid achieving efficient photo-Thermal Catalytic decomposition of volatile organic compounds under IR light
Applied Catalysis B: Environmental, 2019Co-Authors: Songcai Cai, Xi Chen, Jing Chen, Hongpeng JiaAbstract:Abstract Large amounts of anthropogenic VOCs emissions give rise to photochemical smog and ground-level ozone. Currently, Catalytic oxidation for VOCs elimination still requires energy-intensive high temperatures. Light-driven photo-thermocatalysis oxidation of VOCs holds great promise to substantially reduce energy consumption for sustainable development in comparison with conventional Thermal-based Catalytic oxidation. Herein, CeO2/LaMnO3 composite, featuring the broad light wavelength absorption (800∼1800 nm), can be used as a highly active photo-Thermal responsive catalyst on VOCs decomposition under IR irradiation. The maximum photo-Thermal conversion efficiency is able to reach 15.2% with a significant toluene conversion of 89% and CO2 yield of 87% under IR irradiation intensity of 280 mW/cm2, together with excellent stability of nearly 30 h. Comparative characterizations reveal that such photo-Thermal Catalytic activity enhancement is predominantly attributed to the synergistic effects of ultrabroadband strong light absorption, efficient light-to-heat conversion, good low temperature reducibility and high lattice oxygen mobility, originating from an intense interaction of LaMnO3 with CeO2. Toluene oxidation reaction on CeO2/LaMnO3 catalyst proceeds via a Mars-van Krevelen mechanism as evidenced by in situ diffuse reflectance infrared Fourier transform spectroscopy.
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noble metal free ceo2 lamno3 hybrid achieving efficient photo Thermal Catalytic decomposition of volatile organic compounds under ir light
Applied Catalysis B-environmental, 2019Co-Authors: Songcai Cai, Xi Chen, Jing Chen, Hongpeng JiaAbstract:Abstract Large amounts of anthropogenic VOCs emissions give rise to photochemical smog and ground-level ozone. Currently, Catalytic oxidation for VOCs elimination still requires energy-intensive high temperatures. Light-driven photo-thermocatalysis oxidation of VOCs holds great promise to substantially reduce energy consumption for sustainable development in comparison with conventional Thermal-based Catalytic oxidation. Herein, CeO2/LaMnO3 composite, featuring the broad light wavelength absorption (800∼1800 nm), can be used as a highly active photo-Thermal responsive catalyst on VOCs decomposition under IR irradiation. The maximum photo-Thermal conversion efficiency is able to reach 15.2% with a significant toluene conversion of 89% and CO2 yield of 87% under IR irradiation intensity of 280 mW/cm2, together with excellent stability of nearly 30 h. Comparative characterizations reveal that such photo-Thermal Catalytic activity enhancement is predominantly attributed to the synergistic effects of ultrabroadband strong light absorption, efficient light-to-heat conversion, good low temperature reducibility and high lattice oxygen mobility, originating from an intense interaction of LaMnO3 with CeO2. Toluene oxidation reaction on CeO2/LaMnO3 catalyst proceeds via a Mars-van Krevelen mechanism as evidenced by in situ diffuse reflectance infrared Fourier transform spectroscopy.
Yan Lin - One of the best experts on this subject based on the ideXlab platform.
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Thermo–Photo Catalysis for Methanol Synthesis from Syngas
ACS Sustainable Chemistry & Engineering, 2019Co-Authors: Junyu Lang, Yueyue Jiang, Yan LinAbstract:It is well-known that the synthesis of methanol from syngas is based on Thermal catalysis (TC). However, in this work, light was introduced into the Thermal Catalytic process, creating a novel ther...