不同改性组分对Cu-ZnO基催化剂低温甲醇合成性能的影响  

Effect of modifiers on the performance of Cu-ZnO-based catalysts for low-temperature methanol synthesis

作　　者：汤小波[1,2] NORITATSU Tsubaki 解红娟[1] 韩怡卓[1] 谭猗生[1] 

机构地区：[1]中国科学院山西煤炭化学研究所煤转化国家重点实验室,山西太原030001 [2]中国科学院大学,北京100049 [3]日本国立富山大学应用化学系

出　　处：《燃料化学学报》2014年第6期704-709,共6页Journal of Fuel Chemistry and Technology

基　　金：中国科学院山西煤炭化学研究所创新基金(2012SSTBZQT01)

摘　　要：通过共沉淀法制备了Al、Zr和Ce改性的Cu-ZnO基低温甲醇合成催化剂,采用氮气物理吸附、H2-TPR、CO2-TPD、N2O滴定、XRD和TEM等技术对其进行了表征,并考察了改性组分和煅烧温度对其在170℃下合成气制甲醇催化性能的影响。结果表明,经Zr改性的Cu-ZnO基催化剂,其低温甲醇合成性能较好;随着煅烧温度的降低,Cu在催化剂表面的分散度逐渐变大、颗粒逐渐变小,所得到的催化剂其活性也较高;其中,未经煅烧的Cu-ZnO/ZrO2催化剂的活性最佳,其甲醇时空产率为106.02 g/(kg·h),选择性达87.04%。A series of Cu-ZnO-based catalysts modified with Al, Zr, and Ce for the low-temperature methanol synthesis were prepared through co-precipitation and characterized by N2 sorption, H2-TPR, CO2-TPD, N2 O titration, XRD, and high-resolution TEM; the effect of various modifiers and calcination temperature on their catalytic performance in methanol synthesis at 170 ℃ was investigated. The results showed that the Cu-ZnO-based catalyst modified with ZrO2 , among the various modifiers, exhibits the highest activity. Meanwhile, a lower calcination temperature is propitious to get a higher Cu dispersion, a smaller Cu crystal size, and a higher low temperature activity for methanol synthesis; as a result, the uncalcined catalyst exhibits excellent catalytic performance, with a productivity of 106. 02 g/（kg＆#183;h） and a selectivity of 87. 04% to methanol.

关 键 词：改性组分 合成气 低温甲醇合成 煅烧温度 Cu-ZnO基催化剂 

分 类 号：O643[理学—物理化学]