We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
The Carburization of Transition Metal Molybdates (MMoO, M = Cu, Ni or Co) and the Generation of Highly Active Metal/Carbide Catalysts for CO Hydrogenation.
- Authors
Xu, Wenqian; Ramírez, Pedro; Stacchiola, Dario; Brito, Joaquín; Rodriguez, José
- Abstract
A new approach has been tested for the preparation of metal/MoC catalysts using mixed-metal oxide molybdates as precursors. Synchrotron-based in situ time-resolved X-ray diffraction was used to study the reduction and carburization processes of Cu(MoO)(OH), α-NiMoO and CoMoO· nHO by thermal treatment under mixtures of hydrogen and methane. In all cases, the final product was β-MoC and a metal phase (Cu, Ni, or Co), but the transition sequence varied with the different metals, and it could be related to the reduction potential of the Cu, Ni and Co cations inside each molybdate. The synthesized Cu/MoC, Ni/MoC and Co/MoC catalysts were highly active for the hydrogenation of CO. The metal/MoC systems exhibited large variations in the selectivity towards methanol, methane and CH (n > 2) hydrocarbons depending on the nature of the supported metal and its ability to cleave C-O bonds. Cu/MoC displayed a high selectivity for CO and methanol production. Ni/MoC and Co/MoC were the most active catalysts for the activation and full decomposition of CO, showing high selectivity for the production of methane (Ni case) and CH (n > 2) hydrocarbons (Co case). Graphical Abstract: [Figure not available: see fulltext.]
- Subjects
CARBURIZATION; SURFACE preparation; HYDROGENATION; CATALYMETRIC titration; CATALYSTS; CATALYSIS; SURFACE chemistry; PHYSICAL &; theoretical chemistry
- Publication
Catalysis Letters, 2015, Vol 145, Issue 7, p1365
- ISSN
1011-372X
- Publication type
Article
- DOI
10.1007/s10562-015-1540-5