燃料化学学报2012，Vol.40Issue(2)：235-240,6.
分子筛硅铝比及晶粒粒径对Cu-ZnO-Al2O3/HZSM-5催化剂直接合成二甲醚反应性能的影响
Effects of silicon to aluminum ratio and crystal size of zeolite on catalytic properties of Cu-ZnO-Al2O3/HZSM-5 for the direct synthesis of dimethyl ether from syngas
摘要
Abstract
A series of HZSM-5 zeolite samples with different n(SiO2)/n( A12O3) ratios and crystal sizes were hydrothermally synthesized and physically mixed with a methanol synthesis component (CuO-ZnO-Al2 O3) to form hybrid catalysts. The direct synthesis of dimethyl ether (DME) from syngas was carried out over the prepared hybrid catalysts in a pressurized fixed-bed under continuous flow conditions. The results indicated that the selectivity for CO2 decreased with the increase of n(SiO2)/n( A12O3) ratios in HZSM-5 zeolite due to the decrease in the amount and strength of the acid sites, so the selectivity for DME was enhanced greatly. On the other hand, although the activity was not enhanced on the smaller sized HZSM-5 compared to the larger sized one, the selectivity for CO2 and hydrocarbons was decreased evidently.关键词
HZSM-5分子筛/硅铝比/晶粒大小/二甲醚/双功能催化剂/甲醇脱水Key words
HZSM-5 zeolite/ silicon to aluminum ratio/ crystal size/ dimethyl ether/ hybrid catalyst/ dehydration of methanol分类
化学化工引用本文复制引用
毛东森,夏建超..分子筛硅铝比及晶粒粒径对Cu-ZnO-Al2O3/HZSM-5催化剂直接合成二甲醚反应性能的影响[J].燃料化学学报,2012,40(2):235-240,6.基金项目
上海市科委项目(08520513600) （08520513600）
上海市教委重点学科建设项目(J51503). （J51503）
