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Effects of promoter La2O3 and supports on kinetic parameters of dissociation activation of CH4 over ni-based catalysts
Cui Yuehua; Xu Hengyong; Ge Qingjie; Wang Yuzhong; Hou Shoufu; Li Wenzhao
KeywordMethane Dissociation Nickel-based Catalyst Lanthana Activation Energy Pre-exponential Factor
Source PublicationCHINESE JOURNAL OF CATALYSIS
2006-06-01
Volume27Issue:6Pages:479-484
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
WOS SubjectChemistry, Applied ; Chemistry, Physical ; Engineering, Chemical
WOS Research AreaChemistry ; Engineering
WOS KeywordNICKEL-CATALYSTS ; METHANE ; CARBON ; CO2 ; MECHANISM ; NI(111) ; DECOMPOSITION ; EXPLANATION ; CRACKING ; GROWTH
AbstractThe influence of MgAl2O4 and alpha-Al2O3 supports, and La2O3 promoter on the CH4 dissociation was studied by pulsing CH4 over catalysts Ni/alpha-Al2O3 (A), Ni/La2O3/alpha-Al2O3 (A-L), Ni/MgAl2O4 (M), and Ni/La2O3/MgAl2O4 (M-L). In these unsteady pulse reactions, the carbon species coverage on the catalysts was kept less than 100% and the information about CH4 dissociation on the fresh Ni active sites was disclosed. Kinetic parameters for the CH4 dissociation over these catalysts were obtained under reaction conditions free from heat and mass transfer limitations. The CH4 dissociation activation energy (E.) on catalysts A, A-L, M, and M-L is 90.9, 111.8, 79.5, and 85.9 kJ/mol, respectively. The E-a values on catalysts M and M-L are lower than those on catalysts A and A-L. The La2O3 promoter increases the E. of CH4 dissociation. There is a compensation effect between the activation energy and the pre-exponential factor in the CH4 dissociation on the Ni-based catalysts, which reduces the influence of the supports and promoter on the CH4 dissociation.
Language英语
WOS IDWOS:000239190800007
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/140050
Collection中国科学院大连化学物理研究所
AffiliationChinese Acad Sci, Dalian Inst Chem Phys, Lab Nat Gas Utilizat & Appl Catalysis, Dalian 116023, Liaoning, Peoples R China
Recommended Citation
GB/T 7714
Cui Yuehua,Xu Hengyong,Ge Qingjie,et al. Effects of promoter La2O3 and supports on kinetic parameters of dissociation activation of CH4 over ni-based catalysts[J]. CHINESE JOURNAL OF CATALYSIS,2006,27(6):479-484.
APA Cui Yuehua,Xu Hengyong,Ge Qingjie,Wang Yuzhong,Hou Shoufu,&Li Wenzhao.(2006).Effects of promoter La2O3 and supports on kinetic parameters of dissociation activation of CH4 over ni-based catalysts.CHINESE JOURNAL OF CATALYSIS,27(6),479-484.
MLA Cui Yuehua,et al."Effects of promoter La2O3 and supports on kinetic parameters of dissociation activation of CH4 over ni-based catalysts".CHINESE JOURNAL OF CATALYSIS 27.6(2006):479-484.
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