摘要
将纳米ZnO作为甲醇脱水制备二甲醚催化剂的组分,考察了纳米ZnO的含量对催化剂H4SiW12O40-La2O3/纳米ZnO∶γ-Al2O3催化活性的影响。采用TPD和BET等技术探讨分析了纳米ZnO的加入与催化剂结构和表面性质的关系。结果表明:纳米ZnO增大了催化剂的比表面,改善了催化剂的孔结构,提高了催化剂活性组分分散度,增大了中等强度的酸量,提高了甲醇的转化率;催化剂H4SiW12O40-La2O3/纳米ZnO∶γ-Al2O3(1∶3)有最佳催化活性。
The effects of the nano ZnO content on the surface structure and catalyst activity of H4SiW12O40 - La2O3/nano ZnO： γ- Al2O3 are studied which uses ZnO as a component of catalyst to prepare dimethyl ether by dehydration of methanol. With the technologies of TPD and BET, the relation- ship between addition of nano ZnO and the structure of catalyst and surface characteristics is analyzed. The results demonstrate that the application of nano ZnO can increase the specific surface area of catalyst, improve the pore structure of catalyst, enhance the disperse degree of active components, and also the medium strong acid content has been increased as well as the methanol conversion. The catalytic activity is optimal when the ratio of H4SiW12O40 - La2O3 to nano ZnO： γ- Al2O3 is 1 ： 3.
出处
《化学与粘合》
CAS
2008年第4期20-22,共3页
Chemistry and Adhesion
基金
黑龙江省自然科学基金(编号:B2007-13)
黑龙江省教育厅科学技术研究项目资助(编号:11531298)
关键词
纳米ZNO
二甲醚
甲醇脱水
杂多酸
Nano ZnO
dimethyl ether
dehydration of methanol
heteropoly acid
