Citation: WANG Kang-zhou, ZHANG Jian-li, FAN Su-bing, MA Qing-xiang, ZHAO Tian-sheng. Catalytic performance of SAPO-11/HZSM-5 composite supported Cr₂O₃ in the transformation of LPG to light olefins[J]. Journal of Fuel Chemistry and Technology, ;2017, 45(11): 1376-1383. shu

Catalytic performance of SAPO-11/HZSM-5 composite supported Cr₂O₃ in the transformation of LPG to light olefins

State Key Laboratory of Highly-efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China

Corresponding author: FAN Su-bing, zhaots@nxu.edu.cn ZHAO Tian-sheng, fansb@nxu.edu.cn
Received Date: 30 June 2017
Revised Date: 25 August 2017

Fund Project: Graduate Innovation Program of Ningxia University GIP2017024The project was supported by the National Natural Science Foundation of China (21563024) and Graduate Innovation Program of Ningxia University (GIP2017024)the National Natural Science Foundation of China 21563024

Figures(9)

HZSM-5(core)/SAPO-11(shell) composite molecular sieves were hydrothermally synthesized by crystallization of SAPO-11 outside HZSM-5 surface. After loading 10% Cr₂O₃, the pore distribution, acidity, and catalytic activity of the composite supported Cr₂O₃ in the transformation of liquefied petroleum gas (LPG) to ethene and propene were investigated. The results showed the HZSM-5 surface was coated with SAPO-11 microcrystalline of different thicknesses. With the increase of crystallization time, the shell thickness of the composite molecular sieves is increased; the mesoporosity and acidity can then be regulated by controlling the shell thickness. The composite supported Cr₂O₃ exhibits superior activity in the transformation of LPG to olefins than the single molecular sieves or mechanically mixed ones. The Cr₂O₃ catalyst supported on the composite by crystallization for 12 h gives the highest activity and selectivity to the target products; the feed conversion and the selectivity to ethene and propene are 42.63% and 65.89%, respectively, while the selectivities to CH₄ and C₅₊ are 6.32% and 15.48%, respectively.
- composite zeolite,
- chromium oxide,
- LPG,
- selective conversion,
- ethene and propene
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Catalytic performance of SAPO-11/HZSM-5 composite supported Cr2O3 in the transformation of LPG to light olefins

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Catalytic performance of SAPO-11/HZSM-5 composite supported Cr₂O₃ in the transformation of LPG to light olefins