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ACS Appl Mater Interfaces. 2019 May 29;11(21):19066-19076. doi: 10.1021/acsami.9b01267. Epub 2019 May 15.

Alkaline-Etched NiMgAl Trimetallic Oxide-Supported KMoS-Based Catalysts for Boosting Higher Alcohol Selectivity in CO Hydrogenation.

Author information

1
State Key Laboratory of Heavy Oil Processing , China University of Petroleum , Beijing 102249 , China.

Abstract

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 Mo-precursor strategy. The enriched surface anion groups in alkaline-etched MMO affect the textural properties, metal-support interaction, and sulfidation degree of the as-synthesized KMoS-based 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 C2+ 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 C2+ alcohols over unit mass of molybdenum.

KEYWORDS:

KMoS/MMO catalyst; alkaline-etching process; alkalinity/acidity; higher alcohols; synthesis gas; trimetallic Oxides (MMOs)

PMID:
31066261
DOI:
10.1021/acsami.9b01267

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