四乙基氯化铵对SAPO-34分子筛制备及其甲醇制烯烃性能的影响  

Effect of tetraethyl ammonium chloride on the preparation of SAPO-34molecular sieve and its methanol to olefin performance

作　　者：刘志强 程士敏 魏晓娜 李丽 王闯 Liu Zhiqiang;Cheng Shimin;Wei Xiaona;Li Li;Wang Chuang(CP Energy Material(DaLian)Co.,Ltd.,Dalian 116000,Liaoning,China)

机构地区：[1]正大能源材料(大连)有限公司,辽宁大连116000

出　　处：《工业催化》2024年第9期45-49,共5页Industrial Catalysis

摘　　要：以三乙胺和吗啉为主模板剂,四乙基氯化铵(TEAC)为辅助模板剂,采用水热法合成SAPO-34分子筛,通过XRD、SEM、NH 3-TPD、XRF以及N 2吸附-脱附等方法对分子筛进行表征。结果表明,TEAC用量对分子筛粒径和酸性性质有明显影响,当n(TEAC)∶n(Al_(2)O_(3))=0.6时,产物为纯相SAPO-34分子筛;当n(TEAC)∶n(Al_(2)O_(3))增加到0.8时,SAPO-34分子筛粒径减小至约1.2μm,进一步增加TEAC用量分子筛粒径基本不变,此时分子筛的中强酸酸量最多。在甲醇制烯烃反应中,分子筛催化剂寿命长达180 min,乙烯和丙烯选择性达85.41%。The SAPO-34 molecular sieve was synthesized by hydrothermal method with triethylamine and morpholine as the template agent and tetraethylammonium chloride(TEAC)as the auxiliary template agent.The molecular sieve was characterized by XRD,SEM,NH 3-TPD,XRF and N 2 adsorption-desorption.The results showed that the amount of TEAC had significant effects on the particle size and acidity of the molecular sieve.When n(TEAC)∶n(Al_(2)O_(3))=0.6,the product was pure SAPO-34 molecular sieve.When n(TEAC)∶n(Al_(2)O_(3))increased to 0.8,the particle size of SAPO-34 molecular sieve decreased to about 1.2μm,and the molecular sieve particle size remained basically unchanged with the further increase of TEAC dosage,and the amount of medium and strong acid in the molecular sieve was the highest at this time.In the methanol to olefin reaction,the life of the molecular sieve catalyst was 180 min,and the selectivity of ethylene and propylene reached 85.41%.

关 键 词：催化化学 四乙基氯化铵 SAPO-34分子筛 甲醇制烯烃 

分 类 号：O643.36[理学—物理化学] TQ426.6[理学—化学]