在泡沫碳化硅载体上自转化合成silicalite--1型沸石晶体

材料研究学报

2009, Vol. 23

Issue (5): 458-465

研究论文

本期目录 | 过刊浏览

在泡沫碳化硅载体上自转化合成silicalite--1型沸石晶体

矫义来; 杨振明; 曹小明; 田冲; 苏党生; 张劲松

中国科学院金属研究所沈阳 110016

Preparation of silicalite–1 coating on SiC foam ceramics by support self–transformation

JIAO Yilai; YANG Zhenming; CAO Xiaoming ; TIAN Chong; SU Dangsheng; ZHANG Jinsong

Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110016

引用本文:

矫义来杨振明曹小明田冲苏党生张劲松. 在泡沫碳化硅载体上自转化合成silicalite--1型沸石晶体[J]. 材料研究学报, 2009, 23(5): 458-465.
. Preparation of silicalite–1 coating on SiC foam ceramics by support self–transformation[J]. Chin J Mater Res, 2009, 23(5): 458-465.

全文: PDF(1461 KB)

摘要:

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36 m²g^-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.

关键词 ：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：

Silicalite–1 coating on SiC foam ceramic was prepared by support self–transformation method using the residual silicon as silicon source. Silicalite–1/SiC foam composite with a specific surface area of 36 m²g⁻¹ and homogeneous coverage and good thermal mechanical stability and good heat shock stability was fabricated on the SiC foam supports with a residual silicon amount of 16.7%. The influences of residual silicon amount in the supports, synthesis time and composition of the synthesis solution on the loading and morphology of the zeolite layer were investigated. It is found that the residual silicon amount is the key parameter to zeolite crystallization. Zeolite nucleus can not form on the SiC foam ceramic supports with too low amount of residual silicon, but can form on the residual silicon first when the amount is too high, which will make the zeolite crystal detached from the support during the subsequent silicon dissolution. In addition, increasing the template concentration can promote zeolite nucleation and
reduce the size of zeolite crystals.

Key words： inorganic non–metallic materials composites support self–transformation SiC foam silicalite–1 zeolite

收稿日期: 2009-05-04

ZTFLH:

TB321

基金资助:

国家863计划十一五新材料领域重点资助项目2007AA030205.

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https://www.cjmr.org/CN/ 或 https://www.cjmr.org/CN/Y2009/V23/I5/458

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