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P Simonsen - One of the best experts on this subject based on the ideXlab platform.
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activity and deactivation of sulphated tio2 and zro2 based v cu and fe Oxide catalysts for no abatement in alkali containing flue gases
Applied Catalysis B-environmental, 2007Co-Authors: Arkady Kustov, Soren Birk Rasmussen, Rasmus Fehrmann, P SimonsenAbstract:Abstract Vanadia, copper and iron Oxide catalysts supported on conventional TiO2, ZrO2, and sulphated-TiO2 and ZrO2 have been prepared. These catalysts were characterized by elemental analysis, N2-BET, XRD, and NH3-TPD methods. The influence of Potassium Oxide additives on the acidity and activity in NO selective catalytic reduction (SCR) with ammonia was studied. The absolute activity of the samples does not vary significantly depending on the nature of the active metal and the acidic properties of the support used, seem to be influenced mainly by the concentration of active metal. Loading of the catalysts with Potassium leads to a considerable decrease of their catalytic activity. In the case of the traditional carriers (TiO2, ZrO2), the poisoning of the catalyst with small amounts of Potassium Oxide (K/metal ratio
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vanadia on sulphated zro2 a promising catalyst for no abatement with ammonia in alkali containing flue gases
Applied Catalysis B-environmental, 2005Co-Authors: Arkady Kustov, Rasmus Fehrmann, Yu M Kustova, P SimonsenAbstract:Abstract Vanadia supported on TiO2, ZrO2, and sulphated-ZrO2 have been prepared. These catalysts were characterized by elemental analysis, N2-BET, XRD, FTIR, and NH3-TPD methods. The stability of surface sulphated groups, studied by FTIR-spectroscopy, was found to depend dramatically on the temperature of the calcination of the samples. No considerable decomposition of surface sulphates was observed below 350 °C. The influence of Potassium Oxide additives on the acidity and activity in NO SCR with ammonia was studied. It was found that the introduction of small amounts of Potassium (K/V molar ratio
Masaru Ichikawa - One of the best experts on this subject based on the ideXlab platform.
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xps and tpd characterization of manganese substituted iron Potassium Oxide catalysts which are selective for dehydrogenation of ethylbenzene into styrene
Applied Catalysis A-general, 2001Co-Authors: Akihiko Miyakoshi, Akifumi Ueno, Masaru IchikawaAbstract:Abstract Manganese-substituted (0–100%) iron–Potassium Oxide (Mn–Fe–K) catalysts which are selective for dehydrogenation of ethylbenzene to styrene were prepared by the alcOxide sol–gel method. They have been characterized by XPS, BET surface area measurement and TPD studies. The differences of surface properties between the Mn–Fe–K catalysts and unsubstituted iron–Potassium Oxide (Fe–K) catalyst were reasonably reflected in the XPS spectrum of oxygen (O 1s) and Potassium (K 2p). The XPS spectra of Mn–Fe–K catalysts based on the binding energy shifts of O 1s and K 2p bands resembled those of KFeO2 as an active phase for the dehydrogenation of ethylbenzene. On the contrary, the unsubstituted Fe–K catalyst showed the XPS spectra including KOH and Fe3O4 as inactive phases. The presence of Mn ions in the catalyst matrix (γ-Fe2O3, MnFe2O4) results in stabilization of the KFeO2 active phase, and did not affect catalytic behavior of the K-promoted iron based Oxide. The maximum enhancement of catalytic activity at the optimum 20% Mn-substitution is owing to the large surface area, the minimization of carbonaceous deposition, and the retardation of pyrolysis of KFeO2 to KOH and Fe3O4.
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XPS and TPD characterization of manganese-substituted iron–Potassium Oxide catalysts which are selective for dehydrogenation of ethylbenzene into styrene
Applied Catalysis A-general, 2001Co-Authors: Akihiko Miyakoshi, Akifumi Ueno, Masaru IchikawaAbstract:Abstract Manganese-substituted (0–100%) iron–Potassium Oxide (Mn–Fe–K) catalysts which are selective for dehydrogenation of ethylbenzene to styrene were prepared by the alcOxide sol–gel method. They have been characterized by XPS, BET surface area measurement and TPD studies. The differences of surface properties between the Mn–Fe–K catalysts and unsubstituted iron–Potassium Oxide (Fe–K) catalyst were reasonably reflected in the XPS spectrum of oxygen (O 1s) and Potassium (K 2p). The XPS spectra of Mn–Fe–K catalysts based on the binding energy shifts of O 1s and K 2p bands resembled those of KFeO2 as an active phase for the dehydrogenation of ethylbenzene. On the contrary, the unsubstituted Fe–K catalyst showed the XPS spectra including KOH and Fe3O4 as inactive phases. The presence of Mn ions in the catalyst matrix (γ-Fe2O3, MnFe2O4) results in stabilization of the KFeO2 active phase, and did not affect catalytic behavior of the K-promoted iron based Oxide. The maximum enhancement of catalytic activity at the optimum 20% Mn-substitution is owing to the large surface area, the minimization of carbonaceous deposition, and the retardation of pyrolysis of KFeO2 to KOH and Fe3O4.
Arkady Kustov - One of the best experts on this subject based on the ideXlab platform.
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activity and deactivation of sulphated tio2 and zro2 based v cu and fe Oxide catalysts for no abatement in alkali containing flue gases
Applied Catalysis B-environmental, 2007Co-Authors: Arkady Kustov, Soren Birk Rasmussen, Rasmus Fehrmann, P SimonsenAbstract:Abstract Vanadia, copper and iron Oxide catalysts supported on conventional TiO2, ZrO2, and sulphated-TiO2 and ZrO2 have been prepared. These catalysts were characterized by elemental analysis, N2-BET, XRD, and NH3-TPD methods. The influence of Potassium Oxide additives on the acidity and activity in NO selective catalytic reduction (SCR) with ammonia was studied. The absolute activity of the samples does not vary significantly depending on the nature of the active metal and the acidic properties of the support used, seem to be influenced mainly by the concentration of active metal. Loading of the catalysts with Potassium leads to a considerable decrease of their catalytic activity. In the case of the traditional carriers (TiO2, ZrO2), the poisoning of the catalyst with small amounts of Potassium Oxide (K/metal ratio
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vanadia on sulphated zro2 a promising catalyst for no abatement with ammonia in alkali containing flue gases
Applied Catalysis B-environmental, 2005Co-Authors: Arkady Kustov, Rasmus Fehrmann, Yu M Kustova, P SimonsenAbstract:Abstract Vanadia supported on TiO2, ZrO2, and sulphated-ZrO2 have been prepared. These catalysts were characterized by elemental analysis, N2-BET, XRD, FTIR, and NH3-TPD methods. The stability of surface sulphated groups, studied by FTIR-spectroscopy, was found to depend dramatically on the temperature of the calcination of the samples. No considerable decomposition of surface sulphates was observed below 350 °C. The influence of Potassium Oxide additives on the acidity and activity in NO SCR with ammonia was studied. It was found that the introduction of small amounts of Potassium (K/V molar ratio
Akihiko Miyakoshi - One of the best experts on this subject based on the ideXlab platform.
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xps and tpd characterization of manganese substituted iron Potassium Oxide catalysts which are selective for dehydrogenation of ethylbenzene into styrene
Applied Catalysis A-general, 2001Co-Authors: Akihiko Miyakoshi, Akifumi Ueno, Masaru IchikawaAbstract:Abstract Manganese-substituted (0–100%) iron–Potassium Oxide (Mn–Fe–K) catalysts which are selective for dehydrogenation of ethylbenzene to styrene were prepared by the alcOxide sol–gel method. They have been characterized by XPS, BET surface area measurement and TPD studies. The differences of surface properties between the Mn–Fe–K catalysts and unsubstituted iron–Potassium Oxide (Fe–K) catalyst were reasonably reflected in the XPS spectrum of oxygen (O 1s) and Potassium (K 2p). The XPS spectra of Mn–Fe–K catalysts based on the binding energy shifts of O 1s and K 2p bands resembled those of KFeO2 as an active phase for the dehydrogenation of ethylbenzene. On the contrary, the unsubstituted Fe–K catalyst showed the XPS spectra including KOH and Fe3O4 as inactive phases. The presence of Mn ions in the catalyst matrix (γ-Fe2O3, MnFe2O4) results in stabilization of the KFeO2 active phase, and did not affect catalytic behavior of the K-promoted iron based Oxide. The maximum enhancement of catalytic activity at the optimum 20% Mn-substitution is owing to the large surface area, the minimization of carbonaceous deposition, and the retardation of pyrolysis of KFeO2 to KOH and Fe3O4.
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XPS and TPD characterization of manganese-substituted iron–Potassium Oxide catalysts which are selective for dehydrogenation of ethylbenzene into styrene
Applied Catalysis A-general, 2001Co-Authors: Akihiko Miyakoshi, Akifumi Ueno, Masaru IchikawaAbstract:Abstract Manganese-substituted (0–100%) iron–Potassium Oxide (Mn–Fe–K) catalysts which are selective for dehydrogenation of ethylbenzene to styrene were prepared by the alcOxide sol–gel method. They have been characterized by XPS, BET surface area measurement and TPD studies. The differences of surface properties between the Mn–Fe–K catalysts and unsubstituted iron–Potassium Oxide (Fe–K) catalyst were reasonably reflected in the XPS spectrum of oxygen (O 1s) and Potassium (K 2p). The XPS spectra of Mn–Fe–K catalysts based on the binding energy shifts of O 1s and K 2p bands resembled those of KFeO2 as an active phase for the dehydrogenation of ethylbenzene. On the contrary, the unsubstituted Fe–K catalyst showed the XPS spectra including KOH and Fe3O4 as inactive phases. The presence of Mn ions in the catalyst matrix (γ-Fe2O3, MnFe2O4) results in stabilization of the KFeO2 active phase, and did not affect catalytic behavior of the K-promoted iron based Oxide. The maximum enhancement of catalytic activity at the optimum 20% Mn-substitution is owing to the large surface area, the minimization of carbonaceous deposition, and the retardation of pyrolysis of KFeO2 to KOH and Fe3O4.
Rasmus Fehrmann - One of the best experts on this subject based on the ideXlab platform.
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activity and deactivation of sulphated tio2 and zro2 based v cu and fe Oxide catalysts for no abatement in alkali containing flue gases
Applied Catalysis B-environmental, 2007Co-Authors: Arkady Kustov, Soren Birk Rasmussen, Rasmus Fehrmann, P SimonsenAbstract:Abstract Vanadia, copper and iron Oxide catalysts supported on conventional TiO2, ZrO2, and sulphated-TiO2 and ZrO2 have been prepared. These catalysts were characterized by elemental analysis, N2-BET, XRD, and NH3-TPD methods. The influence of Potassium Oxide additives on the acidity and activity in NO selective catalytic reduction (SCR) with ammonia was studied. The absolute activity of the samples does not vary significantly depending on the nature of the active metal and the acidic properties of the support used, seem to be influenced mainly by the concentration of active metal. Loading of the catalysts with Potassium leads to a considerable decrease of their catalytic activity. In the case of the traditional carriers (TiO2, ZrO2), the poisoning of the catalyst with small amounts of Potassium Oxide (K/metal ratio
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vanadia on sulphated zro2 a promising catalyst for no abatement with ammonia in alkali containing flue gases
Applied Catalysis B-environmental, 2005Co-Authors: Arkady Kustov, Rasmus Fehrmann, Yu M Kustova, P SimonsenAbstract:Abstract Vanadia supported on TiO2, ZrO2, and sulphated-ZrO2 have been prepared. These catalysts were characterized by elemental analysis, N2-BET, XRD, FTIR, and NH3-TPD methods. The stability of surface sulphated groups, studied by FTIR-spectroscopy, was found to depend dramatically on the temperature of the calcination of the samples. No considerable decomposition of surface sulphates was observed below 350 °C. The influence of Potassium Oxide additives on the acidity and activity in NO SCR with ammonia was studied. It was found that the introduction of small amounts of Potassium (K/V molar ratio