Show simple item record

dc.contributor.authorYan, QG
dc.contributor.authorWeng, WZ
dc.contributor.author翁维正
dc.contributor.authorWan, HL
dc.contributor.author万惠霖
dc.contributor.authorToghiani, H
dc.contributor.authorToghiani, RK
dc.contributor.authorPittman, CU
dc.date.accessioned2012-04-30T01:53:51Z
dc.date.available2012-04-30T01:53:51Z
dc.date.issued2002-10-12
dc.identifier.citationAPPLIED CATALYSIS A-GENERAL,2003,239(1-2):43-58zh_CN
dc.identifier.issn0926-860X
dc.identifier.urihttp://dx.doi.org/10.1016/S0926-860X(02)00351-4
dc.identifier.urihttps://dspace.xmu.edu.cn/handle/2288/12205
dc.description.abstractPartial oxidation of methane (POM) to syngas and CH4/CO2 reforming have been investigated over a Ni/TiO2 catalyst in a fixed-bed reactor. The Ni/TiO2 catalyst has high initial activity but undergoes significant deactivation during the partial oxidation of methane reaction. Deactivation is due largely to the oxidation of Ni(0) to NiTiO3. After the partial oxidation of methane at 700degreesC the catalyst was pale yellow. XRD confirmed that Ni(0) had been converted to NiTiO3 and oxygen pulse reactions found only traces of carbon were present after the POM reaction. The Ni/TiO2 catalyst has a high activity and a long term stability in the CO2 reforming reaction. XRD found Ni(0) was present after the reforming reaction but NiO and NiTiO3 were absent. Activation of methane over Ni/TiO2 was also investigated using pulse reaction techniques in the absence of gas phase oxygen. Methane pulse reactions demonstrated that the mechanism of methane oxidation changes as the oxidation state of nickel changes. CH4 may have been oxidized by oxygen from solid NiO or by active oxygen within the TiO2 Support via the non-selective Rideal-Eley mechanism over the oxidized Ni/TiO2 catalyst surface. In contrast, CH4 is efficiently converted to CO and H-2 via a direct oxidation mechanism when Ni/TiO2 is reduced. Pulse reaction studies provide evidence that the oxidation state of nickel controls the methane activation mechanism and the product distribution. (C) 2002 Elsevier Science B.V. All rights reserved.zh_CN
dc.language.isoenzh_CN
dc.publisherELSEVIER SCIENCE BVzh_CN
dc.subjectmethanezh_CN
dc.subjectNi/TiO2 catalystzh_CN
dc.subjectsyngaszh_CN
dc.subjectpartial oxidationzh_CN
dc.subjectCO2 reformingzh_CN
dc.subjectoxidation state of nickelzh_CN
dc.subjectTiO2zh_CN
dc.titleActivation of methane to syngas over a Ni/TiO2 catalystzh_CN
dc.typeArticlezh_CN


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record