摘要
以Cu-ZnO-Al2O3催化剂作为甲醇合成组分,以不同固体酸作为脱水组分,制备了一系列CO2加氢合成二甲醚的复合催化剂。研究表明CO2的转化率与固体酸的酸性无关,而取决于Cu-ZnO-Al2O3催化剂上甲醇的合成速率;二甲醚的选择性取决于固体酸的酸量和酸强度,脱水速率与固体酸的中/强酸有关。HZSM-5分子筛作为复合催化剂脱水组分时,二甲醚的收率最高;硅铝比对CO2转化率无影响,但可显著地影响二甲醚选择性;低硅铝比的HZSM-5更适合作为CO2加氢合成二甲醚复合催化剂的脱水组分。
Various hybrid catalysts composed of commercial Cu-ZnO-Al2O3 methanol synthetic catalyst and solid acid catalysts were prepared for the production of dimethyl ether（DME） from CO2 hydrogenation. Results show that the conversion of CO2 is not dependent on the acidity of hybrid catalyst, but is determined by the methanol synthesis rate of hybrid catalyst. The selectivity of CO2 to DME can be controlled by the surface acidity as well as the strength of hybrid catalyst; the middle/strong acid sites might be responsible for the formation of DME. It is also found that HZSM-5 zeolite with lower Si/Al ratio is a preferred solid acid catalyst for DME synthesis, the Si/AI ratio of HZSM-5 has little effect on the conversation of CO2, while greatly affects the selectivity of DME.
出处
《现代化工》
EI
CAS
CSCD
北大核心
2006年第1期35-39,共5页
Modern Chemical Industry
