摘要
进行了超微NaY分子筛的合成。以工业化为基础,系统研究了导向剂的老化时间、分子筛的成胶温度、凝胶的老化温度和时间、以及晶化温度和时间等因素对NaY分子筛细化的影响,合成出n(SiO2)/n(Al2O3)≥5,粒度分布范围小,平均粒径小于300nm的超微NaY分子筛。测定表明,BET比表面积大于890m2·g-1。分别采用合成的分子筛与常规分子筛作为催化剂载体,以甲苯作为模型化合物考察了催化剂的催化脱芳烃性能。结果表明,与常规微米分子筛相比,超微NaY分子筛负载的Pt催化剂的甲苯加氢活性相当,但在加氢产物分布中,环异构化产物的量明显增加,裂化产物则明显减少。
Ultrafine zeolite NaY was hydrothermally synthesized with silica gel and Al_2(SO_4)_3 as silicon and aluminium sources, respectively. The effects of time for aging of the gel and structure-directing reagent, temperature for colloiding, and crystallization temperature and time on crystal size of as-synthesized NaY zeolite wereinvestigated. NaY zeolite with crystal size of less than 200 nm, SiO_2/Al_2O_3 of higher than 5 and BET area of 890 m^2·g^(-1) was synthesized under optimum condition. Catalytic properties of the as-synthesized and conventional NaY zeolite catalysts as the carriers of platinum were investigated using toluene as the model compound. The results showed that activity and selectivity of the catalysts using as-synthesized ultrafine NaY zeolite as the carrier were comparable to the conventional catalyst, with remarkably increased cycloisomerization product and decreased cracking product.
出处
《工业催化》
CAS
2004年第11期41-44,53,共5页
Industrial Catalysis
基金
中国石油天然气集团公司石油科技创新基金资助项目(03E7026)
关键词
超微分子筛
甲苯
加氢脱芳烃
细化
ultrafine NaY zeolite
toluene
aromatics hydroconversion
