沉淀及老化温度对浆态床合成甲醇CuO/ZnO/Al_2O_3催化剂活性及稳定性的影响

Influence of precipitation and aging temperature on the performance of CuO/ZnO/Al_2O_3 catalyst for methanol synthesis in slurry reactor

利用浆态床反应器,考察了沉淀及老化温度对CuO/ZnO/Al2O3催化剂催化合成甲醇的活性及稳定性的影响,并用XRD、BET、FT-IR以及XPS等技术对前驱体及催化剂进行了表征。结果表明,前驱体物相主要以孔雀石(Cu2(CO3)(OH)2)和类孔雀石((Cu,Zn)2(CO3)(OH)2)为主,其中,70℃沉淀和80℃老化条件下制备的前驱体具有适当的结晶度,焙烧后的催化剂中CuO分布均匀,Cu元素的电子结合能位移最大,CuO与ZnO之间作用较强,催化剂的性能最佳,时空收率和失活率分别达到了153.3 g/(kgcat.h)和1.44%/d。

The influence of the temperature of precipitation and aging on the performance of the CuO/ZnO/Al2O3 catalyst used for methanol synthesis was studied in a slurry reactor.The catalysts and precursors were characterized through XRD,BET,FT-IR and XPS.The results show that the phases of the precursors are mainly consisted of malachite（Cu2（CO3）（OH）2） and zinc malachite（（Cu,Zn）2（CO3）（OH）2）,the crystallinity degree of the precursor that precipitated at 70℃ and aged at 80℃ is proper,and the performance of the catalyst from the precursor is optimal,with its CuO phase dispersing homogeneously,the electron binding energy of Cu element shifting the largest and the electron binding energy of Zn element shifting the minimum.Its space time yield and deactivation rate reach 153.3g/（kgcat·h） and 1.44%/d respectively.