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OALib Journal期刊
ISSN: 2333-9721
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在泡沫碳化硅载体上自转化合成silicalite--1型沸石晶体
Keywords: 无机非金属材料,复合材料,自转化合成,泡沫碳化硅,silicalite--1型沸石晶体
Abstract:
？以泡沫碳化硅载体内的残余硅为硅源,在泡沫碳化硅载体上自转化合成silicalite--1型沸石晶体.用残余硅含量为16.7%的泡沫碳化硅作为载体,可制备出负载均匀、耐热性好、抗热冲击、比表面积为36m2g-1的silicalite--1型沸石晶体/泡沫碳化硅复合材料.研究了泡沫碳化硅载体的残余硅含量和水热合成溶液的组成等因素对沸石晶体的自转化合成及其形貌的影响.结果表明,泡沫碳化硅载体中的残余硅含量是影响沸石晶体层结晶的关键因素.当载体中硅的含量过低时,溶液中的硅酸根浓度过低,不具备形成沸石晶体的条件;而当载体中硅的含量过高时,溶液中的硅酸根浓度过高,沸石晶体优先在残余硅的表面形核,随着这些硅的溶解,在其上形成的沸石晶体也随之脱落.增加模板剂的含量可促进沸石晶体形核,从而使沸石晶体的尺寸变小.
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