摘要
利用硅油对HZSM-5分子筛进行液相沉积S iO2改性,制备了S iO2/HZSM-5催化剂(简称催化剂);考察了S iO2沉积量及反应条件对催化剂催化C4烯烃裂解生产丙烯性能的影响;采用X射线衍射、N2等温吸附-脱附、透射电子显微镜、扫描电子显微镜、吡啶吸附-脱附红外光谱等方法对催化剂进行了表征。实验结果表明,在HZSM-5分子筛上沉积SiO2调变了催化剂的孔结构和酸性,SiO2沉积量影响催化剂的性能,当SiO2沉积量为7.0%(质量分数)时,催化剂具有适当的孔结构和酸性,催化剂的性能较好。在530℃、0.1MPa、原料重时空速2.0 h-1、催化剂中SiO2沉积量7.0%的条件下,C4烯烃转化率为42.9%,丙烯收率为28.3%。
HZSM-5 molecular sieve catalyst modified with SiO2 was prepared by impregnation of HZSM-5 molecular sieve in liquid silicon oil. Activity of catalyst for catalytic cracldng of C4 olefins to propylene was evaluated in a mini-fixed-bed reactor. The catalyst was characterized by means of XRD, N2 isothermal adsorption-desorption, TEM, SEM and Py-PTIR. Effects of SiO2 deposition amount and reaction conditions on catalytic activity were investigated. When SiO2 deposition amount is 7.0% （ mass fraction）, activity of SiO2/HZSM-5 catalyst is the best. Under optimal reaction conditions：530℃ ,0.1 MPa and weight hourly space velocity 2.0 h^-1, yield of propylene and conversion of C4 olefins can reach 28.3% and 42.9%, respectively. The SiO2 deposition on HZSM-5 molecular sieve modifies acidity and pore structure of catalyst, so activity of catalyst is improved.
出处
《石油化工》
EI
CAS
CSCD
北大核心
2006年第8期735-739,共5页
Petrochemical Technology
