摘要
以铝酸钠和硅溶胶作为主要原料,在没有引入晶种或有机添加剂的情况下,通过控制合成体系的水含量以及水热合成条件（凝胶摩尔组成：5.1 Na2O·Al2O3·10 SiO2.（140-220）H2O,室温陈化1-3 d及100℃晶化9 h）,可获得粒径为0.30-0.35μm的小晶粒NaY分子筛.借助于XRD,SEM,XRF和DLS等分析手段对分子筛进行了表征,表明所合成的小晶粒NaY分子筛具有粒度均匀、分散性好的特点.对比了两种不同粒径的La/Y催化剂对1-丁烯脉冲芳构化反应的催化性能和反应过程中催化剂的积炭行为,表明粒径较小的催化剂具有较好的稳定性,其容炭能力和抗积炭能力较强.
The NaY zeolite with small crystal size between 0.30 and 0.35μm could be directly synthesized by the hydrothermal method, using sodium aluminate and silica sol as the main raw materials without seed gel or organic additives under hydrothermal conditions. The molar composition of reactants was 5.1 Na2O·Al2O3·10 SiO2·（140-220） H2O, and the reaction system was aged at room temperature for 3 d and was then crystallized at 100 ℃（3 for 9 h）. The NaY zeolite samples were characterized by XRD, SEM, XRF, and DLS techniques. The samples have uniform granularity and good dispersibility. The catalytic performance of two La/Y catalyst samples with different crystal sizes for 1-butene pulse aromatization was measured. The La/Y catalyst sample with smaller crystal size has better aromatization stability, coke accommodation capability, and resistance ability to coke deposition.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
2007年第9期761-765,共5页
关键词
直接合成
水热法
NAY分子筛
小晶粒
丁烯
芳构化
direct synthesis
hydrothermal method
NaY zeolite
small crystal size
butene
aromatization
