燃料化学学报Issue(3)：323-330,8.
焙烧温度对K改性Ag－Fe／ZnO－ZrO2催化剂结构和CO加氢合成低碳混合醇醚性能的影响
Effect of calcination temperature on K modified Ag-Fe/ZnO-ZrO2 catalyst structure and its performance for higher alcohols and DME synthesis fro m CO hydrogenation
摘要
Abstract
A series of K modif ed Ag-Fe/ZnO-ZrO2 catalysts were prepared by co-precipitation method under different calcination temperatures.The ef fect ofc alcination temperature on the catalytic performance for higher alcohols and dimethyl ether ( DME) synthesis from CO hydrogenation was investigated.The catalysts were characterized by nitrogen adsorption, XRD, H2-TPR and CO-TPD.The results s howed that the catalyst calcined at 250 ℃ coul d not rea ch the optimal performance due to insufficient active site s formed at the lower calcination temperature.The catalyst calcined at 300 ℃ exhibited highest CO conversion and higher selectivity of higher alcohols and DME and highest space time yield of higher alcohols and DME reached.As the calcination temperature increased further, the CO conversion decreased, while the selectivity of higher alcohols decreased at first and then increased, the selectivity of DME increased.The catalytic performance of the catalyst wasm ai nly related with its specific surface area, reduction capacity, the dispersi on of the σ-AgFeO2 species and CO adsorption-desorption properties.It was proved that the catalyst with larger specific surface area, being easily reduced, higher dispersion of σ-AgFeO2 specie and more CO adsorption active sites, would be helpful for CO hydrogenation conversion.The decrease of th e non-dissociative adsorption strength for CO on the surface active sites of the catalyst is favorable for the generation of higher alcohols and DME, while the increase of the dissociative adsorption strength for CO is not favorable for the formation of hydrocarbons.关键词
Ag-Fe 催化剂/焙烧温度/一氧化碳加氢/低碳混合醇醚Key words
Ag-Fe catalyst/calcination temperature/CO hydrogenation/higher alcohols and DME分类
化学化工引用本文复制引用
冉磊,华金铭,魏可镁..焙烧温度对K改性Ag－Fe／ZnO－ZrO2催化剂结构和CO加氢合成低碳混合醇醚性能的影响[J].燃料化学学报,2015,(3):323-330,8.基金项目
福州大学人才引进项目（0460－022474）。 （）
