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Qin Q, Liu H, Guo Y, Wang B, Zhu J, Ma J. Insights into the mechanism of the solvolysis of propylene oxide over titanium silicalite-1: a theoretical study. Phys Chem Chem Phys 2023; 25:21358-21375. [PMID: 37530074 DOI: 10.1039/d3cp01696j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/03/2023]
Abstract
In order to probe into the mechanism of solvolysis (alcoholysis/hydrolysis) of propylene oxide (PO), the formation of propylene glycol (PG), 1-methoxy-2-propanol (PPM) and 2-methoxy-1-propanol (SPM) over the TS-1 catalyst with tetrahedral Ti and Ti/defect sites was systematically discussed using an embedded quantum mechanical/molecular mechanics (QM/MM) approach. The results showed that the activity of PO solvolysis is closely related to the ring-opening ability of active substances, and the ring-opening ability is in the following order: Si-O(H)-Ti > Ti-OH > 5MR Ti-OOH > Ti-OCH3 (tetrahedral Ti site); 3MR Ti-OOH > Ti-OH > 5MR Ti-OOH > Ti-OCH3 (Ti/defect site). At the tetrahedral site, the concerted mechanism is the dominant pathway for PO ring opening to form PPM, while a competitive relationship exists between stepwise and concerted mechanisms to form PG and SPM. Si-O(H)-Ti exhibits excellent PO ring-opening activity because of its strong Brønsted acidity, but it is difficult to form. At the Ti/defect site, the stepwise mechanism via PO ring opening with 3MR Ti-OOH and then successive hydrolysis/alcoholysis to form product is the dominant pathway. The overall energy barrier of the optimal route is relatively lower as compared to the tetrahedral Ti site. This work opens up a new path for providing more information on the detailed mechanism in the solvolysis of PO over the TS-1 catalyst from a theoretical point of view.
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Affiliation(s)
- Qiaoyun Qin
- Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, No. 90, Weijin Road, Nankai District, Tianjin, 300072, China.
- Key Laboratory for Green Chemical Technology of Ministry of Education, R&D Center for Petrochemical Technology, Tianjin University, Tianjin 300072, China
| | - Hongxia Liu
- School of Chemistry and Chemical Engineering, Wuhan Textile University, Wuhan, 430200, China
| | - Yanke Guo
- Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, No. 90, Weijin Road, Nankai District, Tianjin, 300072, China.
- Key Laboratory for Green Chemical Technology of Ministry of Education, R&D Center for Petrochemical Technology, Tianjin University, Tianjin 300072, China
| | - Baohe Wang
- Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, No. 90, Weijin Road, Nankai District, Tianjin, 300072, China.
- Key Laboratory for Green Chemical Technology of Ministry of Education, R&D Center for Petrochemical Technology, Tianjin University, Tianjin 300072, China
| | - Jing Zhu
- Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, No. 90, Weijin Road, Nankai District, Tianjin, 300072, China.
- Key Laboratory for Green Chemical Technology of Ministry of Education, R&D Center for Petrochemical Technology, Tianjin University, Tianjin 300072, China
| | - Jing Ma
- Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, No. 90, Weijin Road, Nankai District, Tianjin, 300072, China.
- Key Laboratory for Green Chemical Technology of Ministry of Education, R&D Center for Petrochemical Technology, Tianjin University, Tianjin 300072, China
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Gao X, Luo B, Hong Y, He P, Zhang Z, Wu G. Controllable synthesis of a large TS-1 catalyst for clean epoxidation of a C=C double bond under mild conditions. Front Chem Sci Eng 2023. [DOI: 10.1007/s11705-022-2280-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
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Wang F, Li Q, Wu F, Chu X, Zhu F, Zhao P, Liu B, Xiao G. Catalytic upgradation of crude glycerol to produce bio-based aromatics over hierarchical MFI zeolite: Effect of bimodal hierarchical porosity enhancement and porosity-acidity interaction. MOLECULAR CATALYSIS 2023. [DOI: 10.1016/j.mcat.2022.112858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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The Synergistic Effect of Hydroxylated Carbon Nanotubes and Ultrasound Treatment on Hierarchical HZSM-5 in the Selective Catalytic Upgrading of Biomass Derived Glycerol to Aromatics. Catal Letters 2021. [DOI: 10.1007/s10562-021-03823-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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