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Alumina-supported nickel oxide for ozone decomposition and catalytic ozonation of CO and VOCs [An article from: Chemical Engineering Journal]
Book Details
PublisherElsevier
ISBN / ASINB000P6OWSA
ISBN-13978B000P6OWS6
AvailabilityAvailable for download now
MarketplaceUnited States 🇺🇸
Description
This digital document is a journal article from Chemical Engineering Journal, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
An alumina-supported nickel oxide system with overstoichiometric oxygen (NiO"x/Al"2O"3) was investigated with respect to heterogeneous catalytic decomposition of ozone, complete oxidation of volatile organic compounds (VOCs) and oxidation of CO. The catalyst was prepared by a deposition oxidation-precipitation method and was characterized by chemical analysis, XPS, XRD, IR techniques, magnetic and adsorption measurements. The experiments were performed in the temperature range of -50 to 250^oC in an isothermal plug-flow reactor. A very high activity of the catalyst towards ozone decomposition was observed even at temperatures below -45^oC and at the same time the catalyst remained active for a long time. The activity of the catalyst with respect to complete oxidation of VOCs and oxidation of carbon monoxide was studied in presence of different oxidizing agents (ozone or oxygen). A significant increase in catalytic activity and decrease in reaction temperature were observed using ozone as an oxidant. Two main reasons for this behaviour were found: (i) the high content of active and mobile oxygen obtained during the synthesis on the catalyst surface, and (ii) the catalytically active complex of Ni^4^+O(OH)"2, formed during the reaction of ozone decomposition and able to oxidize VOCs at room temperature.
Description:
An alumina-supported nickel oxide system with overstoichiometric oxygen (NiO"x/Al"2O"3) was investigated with respect to heterogeneous catalytic decomposition of ozone, complete oxidation of volatile organic compounds (VOCs) and oxidation of CO. The catalyst was prepared by a deposition oxidation-precipitation method and was characterized by chemical analysis, XPS, XRD, IR techniques, magnetic and adsorption measurements. The experiments were performed in the temperature range of -50 to 250^oC in an isothermal plug-flow reactor. A very high activity of the catalyst towards ozone decomposition was observed even at temperatures below -45^oC and at the same time the catalyst remained active for a long time. The activity of the catalyst with respect to complete oxidation of VOCs and oxidation of carbon monoxide was studied in presence of different oxidizing agents (ozone or oxygen). A significant increase in catalytic activity and decrease in reaction temperature were observed using ozone as an oxidant. Two main reasons for this behaviour were found: (i) the high content of active and mobile oxygen obtained during the synthesis on the catalyst surface, and (ii) the catalytically active complex of Ni^4^+O(OH)"2, formed during the reaction of ozone decomposition and able to oxidize VOCs at room temperature.
