Zhao Guofeng, Fan Songyua, Pan Xiaxia, Chen Pengjing, Liu Ye, Lu Yong
Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200062, P.R. China.
ChemSusChem. 2017 Apr 10;10(7):1380-1384. doi: 10.1002/cssc.201601848. Epub 2017 Feb 17.
A high-performance SiC-foam-structured nanocomposite catalyst of CoO@Cu O (i.e., 50-100 nm CoO partially covered with ca. 10 nm Cu O) was engineered from nano- to macro-scales in one step for the high-throughput gas-phase aerobic oxidation of bioethanol to acetaldehyde. This special CoO@Cu O nanostructure shows much higher activity/selectivity than other binary metal-oxide assemblies such as CuO &CoO nano-mixtures or inverse Cu O@CoO nanostructures. The catalyst was facilely but exclusively obtainable by in situ reaction-induced transformation of the respective metal nitrates supported on SiC-foam into the CoO@Cu O nanostructure in the reaction stream. It achieved 95 % conversion with 98 % selectivity under mild conditions and was stable for at least 150 h for a feed of 20 vol % ethanol (much higher than in the literature: 1-6 vol %) at a high EtOH weight hourly space velocity of 8.5 h . Abundant Cu O-CoO interfaces and high stability of the CoO@Cu O nanostructure were responsible for the high activity/selectivity and promising stability in this reaction.
一种高性能的CoO@CuO SiC泡沫结构纳米复合催化剂（即50 - 100纳米的CoO部分被约10纳米的CuO覆盖）通过一步法从纳米尺度到宏观尺度构建而成，用于生物乙醇气相高通量有氧氧化制乙醛。这种特殊的CoO@CuO纳米结构比其他二元金属氧化物组合（如CuO和CoO纳米混合物或反相CuO@CoO纳米结构）表现出更高的活性/选择性。该催化剂通过在反应流中将负载在SiC泡沫上的相应金属硝酸盐原位反应诱导转化为CoO@CuO纳米结构，简便而唯一地获得。在温和条件下，它实现了95%的转化率和98%的选择性，对于20体积%乙醇进料（远高于文献中的1 - 6体积%），在8.5 h的高乙醇重量时空速下至少稳定150 h。丰富的CuO - CoO界面和CoO@CuO纳米结构的高稳定性是该反应中高活性/选择性和良好稳定性的原因。
