期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 261, 期 -, 页码 1-8出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2017.10.052
关键词
Structured catalyst; Fiber; Alkali treatment; Hollow zeolite; Mesopore; Methanol-To-propylene
类别
资金
- NSF of China [21773069, 21703069, 21473057, U1462129]
- 973 program from the MOST of China [2011C13201403]
A promising thin-felt stainless-steel-fiber (SS-fiber) structured hollow-ZSM-5/SS-fiber catalyst is developed through alkali leaching of the full-silica core from the silicalite-1@ZSM-5/SS-fiber. A silicalite-1 seeded dry-gel/SS-fiber is obtained by dip-coating technique and is then transformed into the silicalite-1@ZSM-5/SS-fiber (overall SiO2/Al2O3 molar ratio of 93) via seed-assisted dry gel conversion method. Such catalyst shows marked enhancement of mesoporosity development because of the abundant hollow structures left behind after the silicalite-1 core removal by alkali treatment in a mild Na2CO3 media. The effect of alkali-treated time length on catalyst structure, textural and acidic properties as well as methanol-to-propylene (MTP) performance is systematically investigated. As-obtained catalyst, with well-maintained Bronsted acid sites after alkali treatment, shows hollow-structure-dependent stability improvement in the MTP and n-hexane cracking processes due to markedly enhanced diffusion.
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