Synthesis of Hollow Nanocubes and Macroporous Monoliths of Silicalite-1 by Alkaline Treatment
发布时间：2019-03-09
点击次数：
- 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：
- Scopus、EI、SCIE
- 文献类型：
- J
- 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.
- 第一作者
- Dai, Chengyi
- 合写作者
- Song, Chunshan,Liu, Min,Li, Jie,Mu, Dengyou,Hou, Keke,Ding, Fanshu,Zhang, Anfeng,Li, Lingling,Guo, Xinwen
- 通讯作者
- Song, CS (reprint author), Dalian Univ Technol, Sch Chem Engn, PSU DUT Joint Ctr Energy Res, State Key Lab Fine Chem, Dalian 116012, Peoples R China.