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Partial oxidation of methane over Ni/Ce-Ti-O catalysts [An article from: Chemical Engineering Journal]
Book Details
Author(s)Y. Zhang, Z. Li, X. Wen, Y. Liu
PublisherElsevier
ISBN / ASINB000PA9Y4S
ISBN-13978B000PA9Y43
MarketplaceFrance 🇫🇷
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:
Partial oxidation of methane (POM) was studied in this work. The supported nickel catalysts were prepared by the coprecipitation-impregnation method. The influence of the molar ratio of Ce/Ti, the calcination temperature, and the content of active component were investigated during the process of preparation. The results show that the mixed oxides of the Ce-Ti-O-supported Ni catalysts exhibited high catalytic activity and stability. Among the catalysts investigated, the highest catalytic activity was observed over 10wt.% NiO/Ce"0"."5"0Ti"0"."5"0O"2-700^oC which showed excellently stable performance during 100h on stream at 750^oC. The catalysts were characterized by DTA/TG, BET, XRD, and TPR. XRD and TPR results confirmed that the NiO in all catalysts was highly dispersed. There was no NiO but only NiTiO"3 in the NiO/TiO"2 catalyst, due to the reaction between NiO and TiO"2. NiTiO"3 is harder to be reduced to Ni^0 than NiO. The addition of CeO"2 could form a solid solution of Ce-Ti-O, which was able to restrain the reaction between NiO and TiO"2 and improve the storage capacity and mobility of oxygen. It was shown that Ni^0 reduced from NiTiO"3 was active for the POM reaction.
Description:
Partial oxidation of methane (POM) was studied in this work. The supported nickel catalysts were prepared by the coprecipitation-impregnation method. The influence of the molar ratio of Ce/Ti, the calcination temperature, and the content of active component were investigated during the process of preparation. The results show that the mixed oxides of the Ce-Ti-O-supported Ni catalysts exhibited high catalytic activity and stability. Among the catalysts investigated, the highest catalytic activity was observed over 10wt.% NiO/Ce"0"."5"0Ti"0"."5"0O"2-700^oC which showed excellently stable performance during 100h on stream at 750^oC. The catalysts were characterized by DTA/TG, BET, XRD, and TPR. XRD and TPR results confirmed that the NiO in all catalysts was highly dispersed. There was no NiO but only NiTiO"3 in the NiO/TiO"2 catalyst, due to the reaction between NiO and TiO"2. NiTiO"3 is harder to be reduced to Ni^0 than NiO. The addition of CeO"2 could form a solid solution of Ce-Ti-O, which was able to restrain the reaction between NiO and TiO"2 and improve the storage capacity and mobility of oxygen. It was shown that Ni^0 reduced from NiTiO"3 was active for the POM reaction.
