摘要
采用Mg、Ce双金属对USY分子筛催化剂进行改性.通过XRD、SEM、N_2吸附-脱附、NH3-TPD、Py-FTIR和TG-DTA分析方法对催化剂进行了表征.结果表明,双金属改性并没有改变USY的孔道结构,活性组分均匀负载在USY分子筛表面;Mg的加入能够更好地促进Ce元素在USY表面的分散,改性金属元素之间的酸碱相互作用显著提高催化剂表面弱酸强度的L酸中心数量.将改性催化剂应用于苯酚甲醇烷基化反应,邻甲酚选择性达到68.7%,高于Ce-USY的42.4%.
Microporous molecule sieve of Mg / Ce-USY were prepared by impregnation method. The samples were characterized by XRD,SEM,N2 adsorption-desorption,NH_3-TPD,Py-FTIR and TG-DTA. The results showed that modification did not change the structure of USY,active ingredients highly dispersed on the surface of support. The introduction of Mg can promote the dispersion of Ce on the surface of USY better. Acid-base interaction between Mg and Ce increase both the amount and the strength of surface acids especially weak Lewis acids. The catalyst of Mg /Ce-USY were applied in the phenol alkylation with methanol. As a result,the selectivity to o-cresol was 68. 7%compared with 42.4% of Ce-USY only.
作者
明阳
王俊丰
沈健
任铁强
MING Yang WANG Jun-feng SHEN Jian REN Tie-qiang(College of Petrochemical Engineering, Liaoning Shihua University, Fushun 113001, China)
出处
《分子催化》
EI
CAS
CSCD
北大核心
2017年第1期46-52,共7页
Journal of Molecular Catalysis(China)
