期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 21, 页码 19066-19076出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b01267
关键词
higher alcohols; synthesis gas; trimetallic Oxides (MMOs); alkaline-etching process; alkalinity/acidity; KMoS/MMO catalyst
资金
- NSFC [21576288, U1662104]
The acidity/alkalinity and structural properties of NiMgAl trimetallic oxides (MMOs) can be effectively modulated by the alkaline-etching process with various etching times, which are further used as a support to prepare KMoS-based catalysts through the cetyltrimethylammonium bromide-encapsulated Moprecursor strategy. The enriched surface anion groups in alkaline etched MMO affect the textural properties, metal-support interaction, and sulfidation degree of the as-synthesized KMoSbased catalysts. As a result, KMoS-based catalysts using alkaline etched MMO as supports effectively enhance the reducibility and dispersion of Mo species, which exert a positive influence on higher alcohol synthesis (HAS) performance in CO hydrogenation. A proper balance between acidity/alkalinity and structural properties in K, Mo/MMO-x catalysts can significantly enhance the alcohol selectivity in HAS from 55 to 65% (carbon selectivity). The formation of C-2(+) alcohols can be boosted by adol condensation with optimal acidic/basic properties via suppressing the acidity and increasing the amount of basic sites. The alkaline-etching process also significantly improves the space time yield of C-2(+) alcohols over unit mass of molybdenum.
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