低温等离子体制备低碳醇合成用KNiMo基催化剂及其结构性能表征

采用低温等离子体法在温和条件下制备了低碳醇合成（HAS）用的高性能KNiMo基催化剂，利用XRD、氮吸附、TEM、H₂-TPD、CO-TPD和原位CO吸附DRIFTS等技术对其进行了表征。结果表明，与传统的热法制备相比，低温等离子体法不仅缩短了制备时间，而且得到的KNiMo基催化剂层数少、粒径小、分散度高，有利于形成更薄和更短的片层，并暴露大量位于边、角位的催化活性位，促进CO转化和醇的形成，表现出优异的低碳醇合成催化性能。其中，采用低温等离子体直接制备的KNiMo-DPS催化剂，在5 MPa、350℃、空速为5000 h^-1的反应条件下，CO转化率达到32.3%，总醇选择性为75.1%，总醇中C₂₊醇的选择性为65.2%。

Preparation of KNiMo-based catalysts by using non-thermal plasma and their catalytic performance in the synthesis of higher alcohols from syngas

A series of KNiMo-based catalysts were prepared by using non-thermal plasma and characterized by XRD, nitrogen sorption, TEM, H₂-TPD, CO-TPD, and in-situ CO adsorption DRIFTS; their catalytic performance in the higher alcohol synthesis (HAS) from syngas was investigated. The results indicate that in comparison with those prepared by the conventional thermal method, the KNiMo-based catalysts prepared by using non-thermal plasma display thinner and shorter MoS₂ slabs and more highly dispersed and coordinatively unsaturated sites, which endow the KNiMo-based catalysts excellent performance in HAS. In particular, for the HAS over the KNiMo-DPS catalyst under 350 ℃, 5 MPa, and a gas hourly space velocity (GHSV) of 5000 h^-1, the conversion of CO reaches 32.3%, with a selectivity of 75.1% to total alcohol and a C₂₊ alcohol selectivity of 65.2% in the total alcohols.