摘要
在碱性和水热条件下,以十八烷基三甲基氯化胺(ODTMA)为模板剂、有机硅为硅源,合成出含磺酸基的介孔有机硅分子筛PMO-SO3H。分别进行了XRD、红外光谱和TGA分析,并用N2吸附-脱附法测定其比表面积和孔分布,同时进行了苯酚烷基化反应。结果表明,磺酸基摩尔分数高达0.15时,仍然具有介孔分子筛MCM-41的完整晶体结构;比表面积和孔径随磺酸基含量的增加而降低,磺酸基摩尔分数为0.25时,比表面积和孔径仍保持较高值;含磺酸基的介孔分子筛比沸石分子筛催化剂具有更高的活性,介孔有机硅分子筛比介孔硅基分子筛具有更高的水热稳定性;磺酸基在分子筛表面的最佳摩尔分数为0.15。
Under basic and hydrolytic conditions,PMO - SO3H molecular sieve was synthesized using octadecyl - trimethylammonium chloride (ODTMA) as template agent,organicsilica as silicate source. The obtained PMO - SO3H molecular was characterized by XRD,FTIR and TGA. Relative surface area and pore distribution were measured by N2 adsorption - desorption, and alkylation of phenol was carried out. When x = n (MPTMS)/ n (MPTMS+ BTSE) = 0.15, perfect crystalline structure of MCM - 41 molecular sieve still remained. Relative surface area and pore diameter decreased with increasing amount of -SO3H,but even when x =0.25 they were still high. Mesoporous molecular sieve with -SO3H had higher reaction activity and stability than molecular sieve catalysts, x = 0.15 was the optimum.
出处
《石油化工》
CAS
CSCD
北大核心
2003年第11期929-932,共4页
Petrochemical Technology
关键词
介孔有机硅分子筛
固体酸
磺酸
表面改性
多相催化剂
烷基化
合成
催化性能
organosilica mesoporous molecular sieves
solid acid
sulfonic acid
surf ace modification
heteroge-neous catalysis
alkylation
