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Antimony Oxide
The Experts below are selected from a list of 252 Experts worldwide ranked by ideXlab platform
Sang-eon Park – 1st expert on this subject based on the ideXlab platform
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An Overview on the Dehydrogenation of Alkylbenzenes with Carbon DiOxide over Supported Vanadium–Antimony Oxide Catalysts
Catalysis Surveys from Asia, 2007Co-Authors: Jong-san Chang, Vladislav P. Vislovskiy, Do-young Hong, Sang-eon ParkAbstract:Utilization of carbon diOxide as a soft oxidant for the catalytic dehydrogenation of ethylbenzene (CO_2-EBDH) has been recently attempted to explore a new technology for producing styrene selectively. This article summarizes the results of our recent attempts to develop effective catalyst systems for the CO_2-EBDH on the basis of alumina-supported vanadium Oxide catalysts. Its initial activity and on-stream stability were essentially improved by the introduction of Antimony Oxide as a promoter into the alumina-supported catalyst. Insertion of zirconium Oxide into alumina support substantially increased the catalytic activity. Modification of alumina with magnesium Oxide yielded an increase of catalyst stability of alumina-supported V–Sb Oxide due to the coking suppression. Carbon diOxide has been confirmed to play a beneficial role of selective oxidant in improving the catalytic performance through the oxidative pathway, avoiding excessive reduction and maintaining desirable oxidation state of vanadium ion (V^5+). The positive effect of carbon diOxide in dehydrogenation reactions of several alkylbenzenes such as 4-diethylbenzene, 4-ethyltoluene, and iso- and n- propylbenzenes was also observed. Along with the easier redox cycle between fully oxidized and partially reduced vanadium species, the optimal surface acidity of the catalyst is also responsible for achieving high activity and catalyst stability. It is highlighted that supra-equilibrium EBDH conversions were obtained over alumina-supported V–Sb Oxide catalyst in CO_2-EBDH as compared with those in steam-EBDH in the absence of carbon diOxide.
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Catalytic dehydrogenation of ethylbenzene with carbon diOxide: promotional effect of Antimony in supported vanadium–Antimony Oxide catalyst
Catalysis Today, 2003Co-Authors: Min-seok Park, Vladislav P. Vislovskiy, Jong-san Chang, Yong-gun Shul, Sang-eon ParkAbstract:Abstract Alumina-supported vanadium Oxide, VO x /Al 2 O 3 , and binary vanadium–Antimony Oxides, VSbO x /Al 2 O 3 , have been tested in the ethylbenzene dehydrogenation with carbon diOxide and characterized by S BET , X-ray diffraction, X-ray photoelectron spectroscopy, hydrogen temperature-programmed reduction and CO 2 pulse methods. VSbO x /Al 2 O 3 exhibited enhanced catalytic activity and especially on-stream stability compared to VO x /Al 2 O 3 catalyst. Incorporation of Antimony into VO x /Al 2 O 3 increased dispersion of active VO x species, enhanced redox properties of the systems and formed a new mixed vanadium–Antimony Oxide phase in the most catalytically efficient V 0.43 Sb 0.57 O x /Al 2 O 3 system.
Jong-san Chang – 2nd expert on this subject based on the ideXlab platform
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An Overview on the Dehydrogenation of Alkylbenzenes with Carbon DiOxide over Supported Vanadium–Antimony Oxide Catalysts
Catalysis Surveys from Asia, 2007Co-Authors: Jong-san Chang, Vladislav P. Vislovskiy, Do-young Hong, Sang-eon ParkAbstract:Utilization of carbon diOxide as a soft oxidant for the catalytic dehydrogenation of ethylbenzene (CO_2-EBDH) has been recently attempted to explore a new technology for producing styrene selectively. This article summarizes the results of our recent attempts to develop effective catalyst systems for the CO_2-EBDH on the basis of alumina-supported vanadium Oxide catalysts. Its initial activity and on-stream stability were essentially improved by the introduction of Antimony Oxide as a promoter into the alumina-supported catalyst. Insertion of zirconium Oxide into alumina support substantially increased the catalytic activity. Modification of alumina with magnesium Oxide yielded an increase of catalyst stability of alumina-supported V–Sb Oxide due to the coking suppression. Carbon diOxide has been confirmed to play a beneficial role of selective oxidant in improving the catalytic performance through the oxidative pathway, avoiding excessive reduction and maintaining desirable oxidation state of vanadium ion (V^5+). The positive effect of carbon diOxide in dehydrogenation reactions of several alkylbenzenes such as 4-diethylbenzene, 4-ethyltoluene, and iso- and n- propylbenzenes was also observed. Along with the easier redox cycle between fully oxidized and partially reduced vanadium species, the optimal surface acidity of the catalyst is also responsible for achieving high activity and catalyst stability. It is highlighted that supra-equilibrium EBDH conversions were obtained over alumina-supported V–Sb Oxide catalyst in CO_2-EBDH as compared with those in steam-EBDH in the absence of carbon diOxide.
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Catalytic dehydrogenation of ethylbenzene with carbon diOxide: promotional effect of Antimony in supported vanadium–Antimony Oxide catalyst
Catalysis Today, 2003Co-Authors: Min-seok Park, Vladislav P. Vislovskiy, Jong-san Chang, Yong-gun Shul, Sang-eon ParkAbstract:Abstract Alumina-supported vanadium Oxide, VO x /Al 2 O 3 , and binary vanadium–Antimony Oxides, VSbO x /Al 2 O 3 , have been tested in the ethylbenzene dehydrogenation with carbon diOxide and characterized by S BET , X-ray diffraction, X-ray photoelectron spectroscopy, hydrogen temperature-programmed reduction and CO 2 pulse methods. VSbO x /Al 2 O 3 exhibited enhanced catalytic activity and especially on-stream stability compared to VO x /Al 2 O 3 catalyst. Incorporation of Antimony into VO x /Al 2 O 3 increased dispersion of active VO x species, enhanced redox properties of the systems and formed a new mixed vanadium–Antimony Oxide phase in the most catalytically efficient V 0.43 Sb 0.57 O x /Al 2 O 3 system.
Vladislav P. Vislovskiy – 3rd expert on this subject based on the ideXlab platform
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An Overview on the Dehydrogenation of Alkylbenzenes with Carbon DiOxide over Supported Vanadium–Antimony Oxide Catalysts
Catalysis Surveys from Asia, 2007Co-Authors: Jong-san Chang, Vladislav P. Vislovskiy, Do-young Hong, Sang-eon ParkAbstract:Utilization of carbon diOxide as a soft oxidant for the catalytic dehydrogenation of ethylbenzene (CO_2-EBDH) has been recently attempted to explore a new technology for producing styrene selectively. This article summarizes the results of our recent attempts to develop effective catalyst systems for the CO_2-EBDH on the basis of alumina-supported vanadium Oxide catalysts. Its initial activity and on-stream stability were essentially improved by the introduction of Antimony Oxide as a promoter into the alumina-supported catalyst. Insertion of zirconium Oxide into alumina support substantially increased the catalytic activity. Modification of alumina with magnesium Oxide yielded an increase of catalyst stability of alumina-supported V–Sb Oxide due to the coking suppression. Carbon diOxide has been confirmed to play a beneficial role of selective oxidant in improving the catalytic performance through the oxidative pathway, avoiding excessive reduction and maintaining desirable oxidation state of vanadium ion (V^5+). The positive effect of carbon diOxide in dehydrogenation reactions of several alkylbenzenes such as 4-diethylbenzene, 4-ethyltoluene, and iso- and n- propylbenzenes was also observed. Along with the easier redox cycle between fully oxidized and partially reduced vanadium species, the optimal surface acidity of the catalyst is also responsible for achieving high activity and catalyst stability. It is highlighted that supra-equilibrium EBDH conversions were obtained over alumina-supported V–Sb Oxide catalyst in CO_2-EBDH as compared with those in steam-EBDH in the absence of carbon diOxide.
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Catalytic dehydrogenation of ethylbenzene with carbon diOxide: promotional effect of Antimony in supported vanadium–Antimony Oxide catalyst
Catalysis Today, 2003Co-Authors: Min-seok Park, Vladislav P. Vislovskiy, Jong-san Chang, Yong-gun Shul, Sang-eon ParkAbstract:Abstract Alumina-supported vanadium Oxide, VO x /Al 2 O 3 , and binary vanadium–Antimony Oxides, VSbO x /Al 2 O 3 , have been tested in the ethylbenzene dehydrogenation with carbon diOxide and characterized by S BET , X-ray diffraction, X-ray photoelectron spectroscopy, hydrogen temperature-programmed reduction and CO 2 pulse methods. VSbO x /Al 2 O 3 exhibited enhanced catalytic activity and especially on-stream stability compared to VO x /Al 2 O 3 catalyst. Incorporation of Antimony into VO x /Al 2 O 3 increased dispersion of active VO x species, enhanced redox properties of the systems and formed a new mixed vanadium–Antimony Oxide phase in the most catalytically efficient V 0.43 Sb 0.57 O x /Al 2 O 3 system.