摘要
以盐酸浸泡的方法处理SiO2载体,采用两步气相法制备(SiO2)-O-AlCl2催化剂,考察了其在苯与长链烯烃(C10～C13)烷基化反应中的活性、选择性及稳定性,并同未经酸处理SiO2载体制备的催化剂进行了比较。结果表明,采用盐酸处理过的SiO2制备的(SiO2)-O-AlCl2催化剂稳定性提高,在烯烃完全转化的情况下可以循环使用17次,而未经盐酸处理过的SiO2制备的催化剂仅使用11次。IR、TGA及化学分析的结果发现,酸处理后SiO2载体表面的羟基浓度显著提高,并使催化剂上氯化物的固载量从11.18%(质量)提高到15.67%(质量)。但是经酸处理后SiO2产生的表面羟基稳定性较差,较高的催化剂制备温度不利于提高催化剂表面氯化物含量。在200～300℃范围内,200℃制备的催化剂稳定性较好。
SiO2 support was pretreated by hydrochloric acid solution and used to prepare （SiO2）-O-AlCl2 catalyst by the two-step vapor method. Its catalytic performance of activity, stability and selectivity in the alkylation reaction of benzene with mixed long chain olefins （C10-C13） were tested, and compared with that obtained over the catalyst of AlCl3 immobilized on untreated SiO2 support. The catalyst using acidtreated SiO2 as support exhibited the stability of 17 cycles, which was much higher than that of the catalyst of AlCl3 immobilized on untreated SiO2. The results of IR, TGA and chemical analysis indicated that the concentration of hydroxyl and the amount of halide on the surface of SiO2 were increased by the acidtreatment process, which was beneficial to the lifetime of （SiO2）-O-AlCl3 catalyst. Moreover, the immobilization temperature of AlCl3 on the SiO2 support pretreated by hydrochloric acid solution influenced the lifetime of （SiO2）-O AlCl3 catalyst. The （SiO2）-O-AlCl3 catalyst prepared at 200℃ was better.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2007年第8期1973-1977,共5页
CIESC Journal
