Bimodal micro-mesoporous aluminosilicates for heavy oil cracking: Porosity tuning and catalytic properties
✍ Scribed by Qingfeng Tan; Yu Fan; Haiyan Liu; Tengchun Song; Gang Shi; Baojian Shen; Xiaojun Bao
- Publisher
- American Institute of Chemical Engineers
- Year
- 2008
- Tongue
- English
- Weight
- 464 KB
- Volume
- 54
- Category
- Article
- ISSN
- 0001-1541
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✦ Synopsis
Abstract
Through a two‐step synthesis procedure, bimodal micro‐mesoporous aluminosilicates, denoted as B‐MASs, were synthesized by assembling preformed zeolite Y nanoclusters using a triblock polymer as template. By controlling the aging conditions of preformed zeolite nanoclusters the porosity of the B‐MASs was suitably tuned. The characterization results showed that the pore walls of the mesoporous phase in theB‐MASs consist of zeolite Y nanoclusters and the microporosity of the B‐MASs is inherited from the incorporated nanoclusters. It was suggested that more incorporation of the well‐developed zeolite nanoclusters accounts for the increasing microporosity of the B‐MASs with the increasing aging temperature of the preformed zeolite nanoclusters. The incorporated nanoclusters have much shorter pore channels and mainly contribute weak Lewis acid sites to the B‐MASs. The resulting bimodal micro‐mesoporous materials B‐MASs with mutually connected mesopores and shorter micropores showed superior catalytic properties when used for cracking heavy crude oil. © 2008 American Institute of Chemical Engineers AIChE J, 2008