负载杂多酸的表面酸性质和甲醇脱水成醚的催化作用研究  

Study on surfacial acidic properties of loaded heteropoly acid and preparation of dimethytether by catalyzed dehydration of methyl alcohol

作　　者：华瑞年[1] 瞿伦玉[2] 刘勤[2] 王元鸿[2] 李宝利 

机构地区：[1]空军医学高等专科学校,吉林市132013 [2]东北师范大学

出　　处：《空军医高专学报》1996年第2期78-82,共5页

基　　金：国家自然科学基金;吉林省科委资助项目

摘　　要：用IR、TPD、TEM图片研究了H4SiW12O40-Ti(SO4)2-La2O3-HZSM-5的酸性质和表面性质,并与催化甲醇成二甲醚的活性和选择性进行了关联。结果表明,H4SiW12O40-Ti(SO4)2-La2O3-HZSM-5存在着B酸位与L酸位。催化剂的总酸度与甲醇转化率和二甲醚产率有关。反应温度180℃时有最佳的酸催化能力。Keqqin结构的[SiW12O40]4-不能渗入HZSM-5分子筛的孔径,而是完全沉积在HZSM-5分子筛的表面。The surfacial acidic properties of H4SiW12O40-Ti(SO4)2-La2O3-HZS-M-5 have been studied by means of IR,TPD and TEM,and referred to the activity and selectivity of the catalyst for methanol to dimethylether. The result shows that there are Bronsted and Lewis acid sites in H4SiW12O40-Ti(SO4)2-La2O3-HZSM-5,and that the total acidity of the catalyst has much to do with the conversion of methanol and the yield of dimethlether. 180℃ is the best suitable temperature. Keggin unit [SiW12O40]4-cannot penetrate the HZSM-5 pore system but merely becomes deposited on the external HZSM-5 surface.

关 键 词：HZSM-5 十二钨硅酸 负载 酸性 二甲醚合成 

分 类 号：O643.3[理学—物理化学]