个人信息Personal Information
副教授
博士生导师
硕士生导师
主要任职:Associate Professor
其他任职:系教工党支部书记
性别:男
毕业院校:大连理工大学
学位:博士
所在单位:化工学院
学科:工业催化. 能源化工
办公地点:大连理工大学西校区化工实验楼B421
电子邮箱:lium@dlut.edu.cn
Synthesis of Hollow Nanocubes and Macroporous Monoliths of Silicalite-1 by Alkaline Treatment
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论文类型:期刊论文
发表时间:2013-11-12
发表刊物:CHEMISTRY OF MATERIALS
收录刊物:SCIE、EI、Scopus
卷号:25
期号:21
页面范围:4197-4205
ISSN号:0897-4756
关键字:hollow nanocubes; macroporous monoliths; silicalite-1; desilication; competitive adsorption; alkaline treatment
摘要:A simple strategy involving desilication and recrystallization of silicalite-1 in tetrapropylammonium hydroxide (TPAOH) solution was successfully developed to prepare hollow zeolite nanocubes and three-dimensionally macroporous zeolite monoliths. Large voids were introduced to silicalite-1 crystals by controlled silicon leaching with OH- and thin intact shells were formed by the recrystallization of silicon with TPA(+). The size of nanocubes could be easily controlled from similar to 150 nm to similar to 600 nm by simply adjusting the size of parent silicalite-1. Apart from template function to increase the yield of hollow silicalite-1, TPA(+) adsorbed on the zeolite protects the parent crystal surface where the recrystallization occurred. The size of the mesopores and/or macropores in the hollow zeolite shell can be controlled by varying the amount of competitive Na+ adsorbent added to the TPAOH solution. Furthermore, three-dimensional macroporous zeolite monoliths can be formed when an electrolyte, such as NaCl, was added to the TPAOH solution. When the sample was used as the support for iron-based catalyst for hydrogenation of CO2 to hydrocarbons, both the conversion of CO2 and the selectivity of C-5(+) higher hydrocarbons were improved.