摘要
采用溶胶-凝胶法制备了一系列Cu-ZnO/SiO2催化剂,运用N2吸附-脱附、XRD和XRF等方法对催化剂进行了表征,考察了氨水浸泡和造孔剂的添加对催化剂物化性质的影响,并将其用于乙酸甲酯氢解制乙醇反应。实验结果表明,氨水浸泡提高了催化剂试样的比表面积;造孔剂聚乙二醇的添加则进一步增加了催化剂试样的孔体积和孔径,孔分布更集中,有利于活性组分的分散,CuO晶粒尺寸明显下降。在乙酸甲酯氢解反应中,各催化剂均表现出较高的活性和选择性;在反应温度250℃、反应压力7.0 MPa、n(H2)∶n(乙酸甲酯)=10、LHSV=0.50 h-1的条件下,乙酸甲酯转化率和乙醇选择性最高可分别达98.5%和96.2%;运行430 h后,其催化性能未见下降,且可在较低的压力下运行。
A series of Cu-ZnO/SiO2 catalysts were prepared by sol-gel method and characterized by means of N2 adsorption-desorption, XRD and XRF. The effects of pretreatment with NH3H2O and the addition of polyethylene glycol（PEG） on the structural properties of the prepared samples and their catalytic performances in the hydrogenolysis of methyl acetate were investigated. The results show that the pretreatment increases the specific surface areas of the samples and the addition of PEG increases their pore volume and pore size with the narrow distribution, which improves the dispersion of CuO. All the Cu-ZnO/SiO2 catalysts prepared by sol-gel method displayed high activity and selectivity to ethanol in the hydrogenolysis. The conversion of methyl acetate and selectivity to ethanol reached 98.5% and 96.2%, respectively under the conditions of 250 ℃, 7.0 MPa, n（H2） ： n（methyl acetate） 1 0 and LHSV 0.50 h^-1. And their catalytic performances remained unchanged after running 430 h. The catalysts can be used under low pressure.
出处
《石油化工》
CAS
CSCD
北大核心
2013年第5期512-517,共6页
Petrochemical Technology
