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Near-Graphite Coke Deposit on Nano-HZSM-5 Aggregates for Methanol to Propylene and Butylene Reaction

National Institute of Clean-and-Low-Carbon Energy, Beijing 102209, China
Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
Author to whom correspondence should be addressed.
Academic Editors: Keith Hohn, Tian-Yi Ma, Jian-Rong (Jeff) Li and Cláudia Gomes Silva
Catalysts 2017, 7(6), 171;
Received: 23 March 2017 / Revised: 16 May 2017 / Accepted: 18 May 2017 / Published: 1 June 2017
(This article belongs to the Special Issue Nanostructured Materials for Applications in Heterogeneous Catalysis)
PDF [4071 KB, uploaded 2 June 2017]


Nanocrystal HZSM-5 zeolite aggregates with different SiO2/Al2O3 molar ratios were prepared under low temperature and were used to catalyze the conversion of methanol to propylene and butene. The coke location, coke content, and coke species deposited on HZSM-5 aggregates were investigated. The near-graphite carbon on the external surface of HZSM-5 zeolite (SiO2/Al2O3 molar ratio = 400) was distinguished by transmission electron microscopy (TEM) and energy dispersive spectrometer (EDS). The carbon distributions in the micropores and on the external surface of the spent HZSM-5 were revealed by thermogravimetric analysis (TGA) and Brunauer-Emmett-Teller (BET) results. Coke preferred to deposit in the mircopores of low SiO2/Al2O3 molar ratio samples (200, 300) with relatively uniform Al distribution, while coke also preferred to deposit on the external surface and in the intergranular spaces of high SiO2/Al2O3 molar ratio sample (400) with an obviously poor Al core and rich Al shell. View Full-Text
Keywords: HZSM-5 zeolite; nanocrystal; aggregate; coke; methanol; propylene and butylene HZSM-5 zeolite; nanocrystal; aggregate; coke; methanol; propylene and butylene

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Sang, Y.; Xing, A.; Wang, C.; Han, Z.; Wu, Y. Near-Graphite Coke Deposit on Nano-HZSM-5 Aggregates for Methanol to Propylene and Butylene Reaction. Catalysts 2017, 7, 171.

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