Ternary Cobalt–Copper–Niobium Catalysts for the Selective CO Hydrogenation to Higher Alcohols
Ternary Cobalt–Copper–Niobium Catalysts for the Selective CO Hydrogenation to Higher Alcohols
复制标题
三元钴-铜-铌催化剂用于 CO 选择性加氢生成高级醇
DOI：
10.1021/acscatal.5b00388
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发表时间：
2015
期刊：
影响因子：
12.9
通讯作者：
Kruse, Norbert
中科院分区：
文献类型：
--
作者：
Xiang, Yizhi;Barbosa, Roland;Li, Xiaonian;Kruse, Norbert
设计了具有双峰纳米颗粒结构的新型“CoCuNb”三元催化剂，在没有通用载体材料的情况下，并成功地在CO加氢制备高级醇中进行了测试。优化后的C2-C5体系对伯醇的选择性通常超过50 wt %，CO转化率在15%~ 20%之间时，对1-醇/1-烯烃的综合选择性可达173 wt %.通过草酸盐共沉淀实现的双峰纳米尺寸的颗粒分布，含有尺寸范围为25至40 nm的Co-Cu颗粒。在4和8 nm之间的较小颗粒被鉴定为Nb氧化物，并且起到结构分散剂（“间隔物”）和1-醇/1-烯烃生产的促进剂的作用。X-射线光电子能谱显示NbOxto含有大量的4+氧化态的Nb物种。
Novel “CoCuNb” ternary catalysts with bimodal nanosized particle structure, in the absence of a generic support material, were designed and successfully tested in higher alcohol production via CO hydrogenation. The selectivities to primary alcohols with an optimized C2–C5slate usually exceeded the 50 wt % level, and the combined selectivities to 1-alcohols/1-alkenes reached up to ∼73 wt % for CO conversions ranging between ∼5% and nearly 20%. The bimodal nanosized particle distribution, achieved through oxalate coprecipitation, contained Co–Cu particles with sizes ranging from 25 to 40 nm. Smaller particles between 4 and 8 nm were identified as Nb oxides and played the role of a structural dispersant (“spacer”) and promoter of 1-alcohol/1-olefin production. X-ray photoelectron spectroscopy revealed NbOxto contain major amounts of species with Nb in the 4+ oxidation state.