MWCNT-Supported Ni–Mo–K Catalyst for Higher Alcohol Synthesis from Syngas
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- Ma, CH., Li, HY., Lin, GD. et al. Catal Lett (2010) 137: 171. doi:10.1007/s10562-010-0343-y
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A type of novel MWCNT-supported Ni–Mo–K catalysts for higher alcohol synthesis (HAS) from syngas was developed, which displayed excellent performance for the selective formation of C1–3-alcohols and DME from syngas. Over the 15%Ni1Mo1K0.05/CNTs catalyst under the reaction conditions of 5.0 MPa and 538 K, the C-based selectivity of (C1–3-alc. + DME) reached 59.0%, with the corresponding STY of 205 mg h−1 g−1. This value was 1.16 times that of the 35%Ni1Mo1K0.05/AC catalyst with the optimal Ni1Mo1K0.05 loading, and 1.76 times that of the non-supported co-precipitated Ni1Mo1K0.05 host system, under the same reaction conditions. The results of the catalyst characterizations revealed that the CNT-support has strong influence on the chemical states of catalyst via its interaction with the supported Ni–Mo components, leading to the increase of the molar percentage of NiO(OH) and Mo4+/Mo5+ (the two kinds of catalytically active surface-species related closely to selective formation of C1–3-alcohols) and the dramatic decrease of the molar percentage of Ni0 and Mo0 (the two kinds of catalytically active surface-species related closely to selective formation of hydrocarbons, especially methanation of CO). Moreover, the CNT-support also provided the sp2-C surface-sites for adsorption-activation of H2. All these factors contribute to an increase in selectivity of generating C1–3-alcohols.