A spectroscopic study of the effect of H2O and NiO on the surface structure of NiO$z.sbnd;MoO3/Al2O3*1

Autor:	John M. Stencel, J.R. Diehl, T.A. Sarkus, L. E. Makovsky
Rok vydání:	1985
Předmět:	In situ Chemistry Scattering Non-blocking I/O Inorganic chemistry Molybdate Mass spectrometry Catalysis Ion symbols.namesake chemistry.chemical_compound symbols Physical chemistry Physical and Theoretical Chemistry Raman spectroscopy
Zdroj:	Journal of Catalysis. 95:414-422
ISSN:	0021-9517
DOI:	10.1016/0021-9517(85)90119-8
Popis:	The molecular speciation of two sets of NiOMoO 3 Al 2 O 3 catalysts, containing 0–7% NiO with 7.5% MoO3 or 15% MoO3, is examined spectroscopically as a function of in situ O2 calcination-H2O exposure cycles. The sensitivity of ion scattering spectrometry to detect Mo in these catalysts is dependent upon their exposure to H2O but is not dependent upon NiO concentration. This dependence, in conjunction with in situ Raman spectroscopic data, is used to describe sites of interaction of Ni or H2O with the surface molybdate. These NiMo and H2OMo interactions are shown to be distinct and are discussed in relation to previously published data on the structure and HDS activity Of NiOMoO 3 Al 2 O 3 Catalysts.
Databáze:	OpenAIRE
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