Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 20, Issue 17, Pages 11702-11712Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8cp00946e
Keywords
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Funding
- National Natural Science Foundation of China [21522310, 21473244, 91645112, 21773296]
- Natural Science Foundation of Hubei Province of China [2014CFA043]
- Key Research Program of Frontier Sciences, CAS [QYZDB-SSW-SLH026]
- Program for Applied Research on Super Computation of the NSFC-Guangdong Joint Fund [U1501501]
- Open Project Program of State Key Laboratory of Catalytic Materials and Reaction Engineering (RIPP, SINOPEC), Beijing, China
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In this work, a density functional theory (DFT) study was carried out to address the fundamental description of the effective phosphorous species that could improve the framework stability and reduce the coke deposition formation on the P-ZSM-5 zeolite. On the basis of the dealumination barriers of ZSM-5 with all the possible phosphorous species bound on the zeolite framework, PO4H 4 was ascertained to be the effective phosphorous species that could improve the ZSM-5 zeolite hydrothermal stability and reduce its acid strength. Apart from this, the olefin polymerization reaction is the main cause of coking deactivation for ZSM-5. Thus, the effect of the modification P-ZSM-5 on the reactivity of light olefins dimerization was also studied. Compared to the unmodified ZSM-5, the activation energy of the rate-limiting step of ethylene dimerization was increased from 20.3 kcal mol(1) to 34.6 kcal mol (1), thereby apparently inhibiting ethylene dimerization and improving the resistance to coke deposition for P-ZSM-5. Our calculation results should provide a beneficial theoretical guide for designing and improving a catalyst for the methanol-to-olefins process and bioethanol dehydration.
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