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In situ IR spectroscopic studies on molybdenum nitride catalysts: active sites and surface reactions
Wu, ZL; Yang, SW; Xin, Q; Li, C
KeywordIr Mo2n/gamma-al2o3 Surface Sites Surface Reactions
Source PublicationCATALYSIS SURVEYS FROM ASIA
2003-09-01
Volume7Issue:2-3Pages:103-119
Indexed BySCI
SubtypeArticle
Department503
Funding Project503
Contribution Rank1;1
WOS HeadingsScience & Technology ; Physical Sciences
WOS SubjectChemistry, Physical
WOS Research AreaChemistry
WOS KeywordTEMPERATURE-PROGRAMMED DESORPTION ; TRANSITION-METAL PHOSPHIDES ; FREQUENCY GENERATION SFG ; NO-CO REACTION ; FT-IR ; THIOPHENE HYDRODESULFURIZATION ; MO2N/GAMMA-AL2O3 CATALYST ; HYDRAZINE DECOMPOSITION ; ADSORPTION EQUILIBRIUM ; INFRARED-SPECTROSCOPY
AbstractRecent IR spectroscopic studies on the surface properties of fresh Mo2N/gamma-Al2O3 catalyst are presented in this paper. The surface sites of fresh Mo2N/gamma-Al2O3, both Modelta+ (0<δ<2) and N sites, are probed by CO adsorption. Two characteristic IR bands were observed at 2045 and 2200 cm(-1), due to linearly adsorbed CO on Mo and N sites, respectively. The surface N sites are highly reactive and can react with adsorbed CO to form NCO species. Unlike adsorbed CO on reduced passivated one, the adsorbed CO on fresh Mo2N/gamma-Al2O3 behaves similarly to that of group VIII metals, suggesting that fresh nitride resembles noble metals. It is found that the surface of Mo nitrides slowly transformed into sulfide under hydrotreating conditions, which could be the main reason for the activity drop of molybdenum nitride catalysts in the presence of sulfur-containing species. Some surface reactions, such as selective hydrogenation of 1,3-butadiene, isomerization of 1-butene, and hydrodesulfurization of thiophene, were studied on both fresh and reduced passivated Mo2N/gammaAl(2)O(3) catalysts using IR spectroscopy. The mechanisms of these reactions are proposed. The adsorption and reaction behaviors of these molecules on fresh molybdenum nitride also resemble those on noble metals, manifesting the unique properties of fresh molybdenum nitride catalysts. Mo and N sites are found to play different roles in the adsorption and catalytic reactions on the fresh Mo2N/gammaAl(2)O(3) catalyst. Generally, Mo sites are the main active sites for the adsorption and reactions of adsorbates; N sites are not directly involved in catalytic reactions but they modify the electronic properties of Mo sites.
Language英语
URL查看原文
WOS IDWOS:000184812500001
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/82909
Collection中国科学院大连化学物理研究所
AffiliationChinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
Recommended Citation
GB/T 7714
Wu, ZL,Yang, SW,Xin, Q,et al. In situ IR spectroscopic studies on molybdenum nitride catalysts: active sites and surface reactions[J]. CATALYSIS SURVEYS FROM ASIA,2003,7(2-3):103-119.
APA Wu, ZL,Yang, SW,Xin, Q,&Li, C.(2003).In situ IR spectroscopic studies on molybdenum nitride catalysts: active sites and surface reactions.CATALYSIS SURVEYS FROM ASIA,7(2-3),103-119.
MLA Wu, ZL,et al."In situ IR spectroscopic studies on molybdenum nitride catalysts: active sites and surface reactions".CATALYSIS SURVEYS FROM ASIA 7.2-3(2003):103-119.
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