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Ni-decorated carbon nanotube-promoted Ni–Mo–K catalyst for highly efficient synthesis of higher alcohols from syngas

Paper ID Volume ID Publish Year Pages File Format Full-Text
47166 46462 2010 9 PDF Available
Title
Ni-decorated carbon nanotube-promoted Ni–Mo–K catalyst for highly efficient synthesis of higher alcohols from syngas
Abstract

A type of metallic nickel-decorated CNT-doped Ni–Mo–K oxide-based catalysts was developed, with excellent performance for the selective formation of C1–3-alcohols from syngas. Under reaction condition of 8.0 MPa and 558 K, the space-time-yield of C1–3-alcohols plus dimethyl ether reached 555 mg h−1 g−1 over the Ni1Mo1K0.05–11% (5% Ni/CNT) catalyst. The addition of a minor amount of the Ni-decorated CNTs into the NiiMojKk host catalyst caused little change in the apparent activation energy for the higher alcohol synthesis (HAS), but led 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). An excellent adsorption performance of the Ni-decorated CNTs for H2 would be conducive to generating a surface micro-environment with a high concentration of H-adspecies in the form of sp2-C–H on the functioning catalyst. In addition, high concentration of H-adspecies on the catalyst would greatly inhibit the water-gas-shift side-reaction. All these factors contribute to an increase in the yield of C1–3-alcohols.

Graphical abstractA type of novel Ni-decorated CNT-doped Ni–Mo–K catalysts was developed, with much better performance for effective and selective formation of C1–3-alcohols from syngas, compared to the CNT-free Ni–Mo–K host and the simple CNT-doped counterpart. The catalysts were characterized and the nature of promoting action by the CNT-based promoter was inquired.Figure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights▶ Development of a type of Ni-decorated CNT-promoted Ni–Mo–K oxide-based catalyst with excellent performance for selective formation of C1–3-alcohols from syngas. Under reaction condition of 8.0 MPa and 558 K, the space-time-yield of C1–3-alcohols plus DME reached 555 mg h−1 g−1 over the developed Ni1Mo1K0.05–11% (5% Ni/CNT) catalyst. ▶ The characterization studies of the catalyst systems revealed that the promoter action by the CNTs was mainly in providing the sp2-C surface-sites for adsorption-activation of H2 (one of the reactants), while simultaneously enhancing the molar percentage of the two kinds of catalytically active species, NiO(OH) and Mo4+/Mo5+ (both related closely to selective formation of C1–3-alc.), via affecting the chemical states of catalyst. ▶ Appropriate decoration of the CNTs by a minor amount of metallic nickel could improve the capability of CNT's adsorbing H2, rendering their promoter action more remarkable.

Keywords
Higher alcohol synthesis; Multi-walled carbon nanotubes; Ni-decorated MWCNTs; x% Ni/CNT-doped Ni–Mo–K catalyst
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Ni-decorated carbon nanotube-promoted Ni–Mo–K catalyst for highly efficient synthesis of higher alcohols from syngas
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 100, Issues 1–2, 11 October 2010, Pages 245–253
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
You save - $31
Price after discount Only $4.95
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