Identifying the effective phosphorous species over modified P-ZSM-5 zeolite: a theoretical study

Literature Information

Publication Date 2018-04-04
DOI 10.1039/C8CP00946E
Impact Factor 3.676
Authors

Yueying Chu, Xiuzhi Gao, Xin Zhang, Guangtong Xu


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Abstract

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, PO4H4 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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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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