高等学校化学学报2011，Vol.32Issue(3)：765-771,7.
SAPO-34分子筛的合成及甲醇制烯烃催化性能
Synthesis and MTO Catalytic Performance of SAPO-34
摘要
Abstract
Effects of n ( SiO2 ): n ( Al2 O3 ), n ( P205 ): n ( A1203 ) and n ( H2 O): n ( Al2 O3 ) in the synthesis gel on the crystallization of SAPO-34 were systematically studied with triethylamine as a templating molecule for the purpose of improving its catalytic performance in methanol to olefin(MTO) reaction. Pure SAPO-34 phase can only be synthesized with the synthesis gel having a n( SiO2 ): n( A1203 ) larger than 0.25, demonstrating the structure-directing role of Si. Nevertheless, a further increase in the Si content in the synthesis gel led to not only the formation of Al2 O3 but also the decrease in the crystallinity, surface area and catalytic stability of SAPO-34. The n(P205 ): n(Al2O3 ) and n( H20): n( A1203 ) in the synthesis gel also significantly influenced the crystallization and catalytic performance of SAPO-34. When n( P2O5 ): n( A1203 ) and n(H2O): n( Al2O3 ) were 1.1 and 36, respectively, the synthesized sample with a n( P + Si): n(Al) close to 1 showed high sur face area and appropriate acidity, resulting in a catalytic lifetime of 520 min without lowering olefin selectivity.The catalytic performance of SAPO-34 is also highly dependent on its calcination conditions. The sample cal cined at 550 ℃ for 8 h in flowing air showed a much higher catalytic stability( its catalytic lifetime reached 580min) than the sample calcined for 10 h under the same conditions as a result of different hydrocarbon residuals kept in SAPO-34 after calcination.关键词
SAPO-34分子筛/焙烧/催化性能/甲醇制烯烃(MTO)反应Key words
SAPO-34 zeolite/ Calcination/ Catalytic performance/ Methanol to olefin(MTO) reaction分类
化学化工引用本文复制引用
李俊汾,樊卫斌,董梅,何月,秦张峰,王建国..SAPO-34分子筛的合成及甲醇制烯烃催化性能[J].高等学校化学学报,2011,32(3):765-771,7.基金项目
国家自然科学基金(批准号:21003148,10979068)和国家"九七三"计划项目(批准号:2010CB234603,2011CB201403)资助. （批准号:21003148,10979068）
