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Zeolite–zeolite composite fabricated by polycrystalline Y zeolite crystals parasitizing ZSM-5 zeolite

Published online by Cambridge University Press:  07 August 2015

Guangshuai Wang ,
Yujian Liu ,
Jiajun Zheng ,
Meng Pan ,
Hongyan Zhang ,
Biao Li ,
Shuai Yuan ,
Yuming Yi ,
Huiping Tian  and
Ruifeng Li
Guangshuai Wang
Affiliation:
Research Centre of Energy Chemical & Catalytic Technology, Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Yujian Liu
Affiliation:
Sinopec Research Institute of Petroleum Processing, Beijing 100083, China
Jiajun Zheng*
Affiliation:
Research Centre of Energy Chemical & Catalytic Technology, Taiyuan University of Technology, Taiyuan 030024, China
Meng Pan
Affiliation:
Research Centre of Energy Chemical & Catalytic Technology, Taiyuan University of Technology, Taiyuan 030024, China
Hongyan Zhang
Affiliation:
Research Centre of Energy Chemical & Catalytic Technology, Taiyuan University of Technology, Taiyuan 030024, China
Biao Li*
Affiliation:
Research Centre of Energy Chemical & Catalytic Technology, Taiyuan University of Technology, Taiyuan 030024, China
Shuai Yuan
Affiliation:
Sinopec Research Institute of Petroleum Processing, Beijing 100083, China
Yuming Yi
Affiliation:
Research Centre of Energy Chemical & Catalytic Technology, Taiyuan University of Technology, Taiyuan 030024, China
Huiping Tian
Affiliation:
Sinopec Research Institute of Petroleum Processing, Beijing 100083, China
Ruifeng Li*
Affiliation:
Research Centre of Energy Chemical & Catalytic Technology, Taiyuan University of Technology, Taiyuan 030024, China
*
b)e-mail: zhengjiajun@tyut.edu.cn
a)Address all correspondence to these authors. e-mail: rfli@tyut.edu.cn
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Abstract

A series of zeolite–zeolite composites were prepared by a two-step hydrothermal crystallization procedure in which the mixture of presynthesized ZSM-5 zeolite acts as nutrients for the growth of postsynthesized Y zeolite, and the as-synthesized products are denoted as MFI–FAU. The structural, crystalline, and textural properties of the as-synthesized materials, as well as the references Y, ZSM-5, and a corresponding physical mixture composed of Y and ZSM-5 zeolite, were characterized by x-ray powder diffraction (XRD), Fourier transform infrared spectrum (FTIR), temperature-programmed desorption of ammonia, N2 adsorption–desorption, scanning electron microscopy, energy-dispersive spectrometry, and Thermogravimetry. The results show that the ratio of Y to ZSM-5 in the composite can be adjusted by controlling the hydrothermal treatment time of the second-step synthesis. Steric hindrance provoked by the concurrently growing crystals offers the postsynthesized Y zeolite phase, a relatively smaller size. A hierarchical pores system, which results from the extraction of silicon species from ZSM-5 and the polycrystalline accumulation of Y zeolite, has been created in the zeolite–zeolite composite. Catalytic performances of the zeolite–zeolite composite catalysts as well as the references catalysts were investigated during the catalytic cracking of isopropylbenzene. As compared with the corresponding physical mixture, the composite catalysts display the excellent catalytic performances with a higher conversion of isopropylbenzene as well as a longer catalytic life because of the introduced hierarchical pores system and the formation of special composite structure.

Keywords

zeolite–zeolite compositehierarchicalMFI–FAUreverse growthisopropylbenzene cracking
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 16 , 28 August 2015 , pp. 2434 - 2446
Copyright
Copyright © Materials Research Society 2015 

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References

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