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Structural features of core–shell zeolite–zeolite composite and its performance for methanol conversion into gasoline and diesel

Published online by Cambridge University Press:  06 June 2016

Jiajun Zheng ,
Xiaobo Sun ,
Yanze Du ,
Bo Qin ,
Yanyu Zhang ,
Hongyan Zhang ,
Meng Pan  and
Ruifeng Li
Jiajun Zheng*
Affiliation:
Research Centre of Energy Chemical & Catalytic Technology, Taiyuan University of Technology, Taiyuan 030024, China
Xiaobo Sun
Affiliation:
Research Centre of Energy Chemical & Catalytic Technology, Taiyuan University of Technology, Taiyuan 030024, China
Yanze Du
Affiliation:
Research Centre of Energy Chemical & Catalytic Technology, Taiyuan University of Technology, Taiyuan 030024, China; and Fushun Research Institute of Petroleum and Petrochemicals, SINOPEC Fushun 113001, China
Bo Qin
Affiliation:
Fushun Research Institute of Petroleum and Petrochemicals, SINOPEC Fushun 113001, China
Yanyu Zhang
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
Meng Pan
Affiliation:
Research Centre of Energy Chemical & Catalytic Technology, Taiyuan University of Technology, Taiyuan 030024, China
Ruifeng Li*
Affiliation:
Research Centre of Energy Chemical & Catalytic Technology, Taiyuan University of Technology, Taiyuan 030024, China
*
a)Address all correspondence to these authors. e-mail: [email protected]
b)e-mail: [email protected]
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Abstract

Zeolite–zeolite composite composed of alumina-rich hierarchically porous ZSM-5 cores and high-silicon MFI shells was prepared by a hydrothermal synthesis procedure, in which a commercial ZSM-5 zeolite with a SiO2/Al2O3 of 36 was treated by an alkaline solution and then used as a supporter for epitaxial growth of a polycrystalline Silicalite-1 zeolite shell (denoted as MMZsa). Acid sites associated with framework Al on exterior surfaces of ZSM-5 zeolite cores are therefore passivated in different degrees by the epitaxial MFI zeolite shell. The structural, crystalline, and textural properties of the as-synthesized samples were characterized by x-ray powder diffraction (XRD), energy-dispersive x-ray spectroscopy, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), N2 adsorption-desorption, in situ IR spectra of pyridine and NH3-TPD. Aluminum species were observed to transfer from the alumina-rich cores to the high-silica shells. The adjustable thickness and SiO2/Al2O3 ratio of the shell offer the as-synthesized composite a potential and high-efficiency catalyst for methanol conversion into gasoline and diesel. As compared with the commercial ZSM-5 zeolite, the composite catalyst exhibits excellent catalytic performances with a longer catalytic life as well as a higher conversion and a slightly higher yield of diesel oil.

Keywords

zeolite–zeolite compositescore–shellMFI–MFIdehydration of methanolfuel oil
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 15 , 15 August 2016 , pp. 2302 - 2316
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Copyright
Copyright © Materials Research Society 2016 

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