CuZnAl/碳纤维复合材料催化合成气制备低碳醇

采用共沉淀法制备CuZnAl类水滑石，将其担载于活化碳纤维（ACFs）表面，通过焙烧还原合成功能化复合催化剂（CuZnAl/ACFs）。借助XRD、FT-IR及N₂吸附-脱附等方法对该复合物进行表征，并将其应用于合成气制备低碳醇的反应中，进行活性评价。结果表明，复合催化剂中活性组分在碳纤维表面均匀分散，碳纤维表面催化剂的颗粒尺寸减小，比表面积增大。ACFs的导电性加速醇合成过程中的电子传递，促进反应进行，因而CO转化率的提高（最高可达47%）。同时，ACFs提高催化剂表面ZnO的分散度，从而促进Cu与ZnO形成金属氧化物界面。这有利于低碳醇的生成，因而使C2以上醇的选择性高达39%。

Catalytic Synthesis of Higher Alcohols Form Syngas over Composite Material of CuZnAl/Carbon Fibers

In this work, CuZnAl hydrotalcite-like compounds were prepared by a co-precipitation method, and the obtained hydrotalcite-like compounds were loaded on the surface of activated carbon fibers (ACFs). The composites consisting of CuZnAl phase and ACFs were prepared by calcination of the hydrotalcite-like compounds with ACFs and then reduction. The composites were characterized by XRD, FTIR and N₂ adsorption-desorption analyses, and catalytic activity of the composites was evaluated for synthesis of higher alcohols form syngas. The results suggest that the active components of the composites are well dispersed on the surface of the ACFs. The particle size of the catalyst decreases and its specific surface area increase with addition of ACFs. The electrical conductivity of ACFs improves electron transfer during alcohol synthesis, which promotes the synthesis reaction and thus increases CO conversion (the highest conversion of 47%). In addition, ACFs enhance dispersity of ZnO and therefore promote formation of metal-oxide interface between Cu and ZnO. This facilities synthesis of higher alcohols, and therefore the selectivity for the alcohols with more than one carbon atoms reached up to 39%.