The Composition of Ni-Mo Phases Obtained by NiMoOx-SiO2 Reduction and Their Catalytic Properties in Anisole Hydrogenation Full article
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Applied Catalysis A: General
ISSN: 0926-860X , E-ISSN: 1873-3875 |
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| Output data | Year: 2016, Volume: 514, Pages: 224-234 Pages count : 11 DOI: 10.1016/j.apcata.2016.01.025 | ||||||
| Tags | Anisole, Hydrodeoxygenation, Hydrogenation, Ni-Mo alloys, NiMo-based catalysts | ||||||
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Abstract:
The specific features of the formation of nickel- and molybdenum-containing phases during the reductionof the oxide precursor of the NiMoOx-SiO2catalyst with hydrogen at three different temperatures (470,570, and 750◦C) were studied. The reduction behavior was investigated and the reduction temperature ofoxide forms was determined with the use of the methods of temperature-programmed reduction, X-raydiffraction analysis, and X-ray photoelectron spectroscopy. It was shown that, at a reduction temperaturefrom 470 to 570◦C, one can observe the formation of NiMoOxparticles with the NiO-type structure, Ni-Moalloys of different composition, and MoO2, which pass into the metallic phases Mo, Ni3Mo, and NixMo1-xat 750◦C. Nickel located at the surface is completely reduced to the metallic state in the temperaturerange of 300–750◦C, the Mo◦content increases with the growing of treatment temperature and reaches100% at 750◦C. Based on the data obtained, a reduction scheme for the catalytic system is proposed.The catalytic properties of the systems obtained are studied in the anisole hydrogenation reaction at atemperature of 300◦C and a hydrogen pressure of 6 MPa. The results of catalytic experiments showed thatthe 750-NiMo-SiO2catalyst possesses the highest specific activity in the anisole hydrogenation, which isprobably due to the complete reduction of nickel oxide forms and molybdenum to metallic forms, whichare highly active in the hydrogenation of C O bonds and aromatic rings. The highest selectivity in theformation of oxygen-free products can be attributed to the catalysts reduced at 470–570◦C and whoseactive component contains coordinatively unsaturated molybdenum atoms. The most stable during thethermal treatment in acetic acid is the 750-NiMo-SiO2catalyst, which can be explained by the fact thatit contains Ni-Mo alloys highly stable in the acid medium.
Cite:
Smirnov A.A.
, Khromova S.A.
, Ermakov D.Y.
, Bulavchenko O.A.
, Saraev A.A.
, Aleksandrov P.V.
, Kaichev V.V.
, Yakovlev V.A.
The Composition of Ni-Mo Phases Obtained by NiMoOx-SiO2 Reduction and Their Catalytic Properties in Anisole Hydrogenation
Applied Catalysis A: General. 2016. V.514. P.224-234. DOI: 10.1016/j.apcata.2016.01.025 WOS Scopus РИНЦ ANCAN OpenAlex
The Composition of Ni-Mo Phases Obtained by NiMoOx-SiO2 Reduction and Their Catalytic Properties in Anisole Hydrogenation
Applied Catalysis A: General. 2016. V.514. P.224-234. DOI: 10.1016/j.apcata.2016.01.025 WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | Jul 27, 2015 |
| Accepted: | Jan 19, 2016 |
| Published online: | Jan 21, 2016 |
| Published print: | Mar 25, 2016 |
Identifiers:
| Web of science: | WOS:000371551200023 |
| Scopus: | 2-s2.0-84956533092 |
| Elibrary: | 26864593 |
| Chemical Abstracts: | 2016:190563 |
| Chemical Abstracts (print): | 164:253173 |
| OpenAlex: | W2262456546 |