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Zhu J, Yan S, Xu G, Zhu X, Yang F. Fabrication of sheet-like HZSM-5 zeolites with various SiO2/Al2O3 and process optimization in hexane catalytic cracking. J SOLID STATE CHEM 2022. [DOI: 10.1016/j.jssc.2022.123772] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
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Dai L, Zhou N, Lv Y, Cobb K, Chen P, Wang Y, Liu Y, Zou R, Lei H, Mohamed BA, Ruan R, Cheng Y. Catalytic reforming of polyethylene pyrolysis vapors to naphtha range hydrocarbons with low aromatic content over a high silica ZSM-5 zeolite. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 847:157658. [PMID: 35908703 DOI: 10.1016/j.scitotenv.2022.157658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Revised: 07/05/2022] [Accepted: 07/23/2022] [Indexed: 06/15/2023]
Abstract
In this study, the microwave-assisted pyrolysis coupled with ex-situ catalytic reforming of polyethylene for naphtha range hydrocarbons, with low aromatic content, was investigated. Experimental results revealed that ZSM-5 zeolites with low SiO2/Al2O3 ratios led to high aromatic selectivity, while an extremely high SiO2/Al2O3 ratio significantly reduced the aromatic selectivity. The high selectivity of C5-C12 hydrocarbons (98.9 %) with low selectivity of C5-C12 aromatics (28.5 %) was obtained over a high silica ZSM-5 zeolite at a pyrolysis temperature of 500 °C, catalytic cracking temperature of 460 °C, and a weight hourly space velocity of 7 h-1. The liquid oil produced was mainly composed of C5-C12 olefins that can be easily converted into paraffin-rich naphtha by hydrogenation or hydrogen transfer reactions as the feedstock for new plastic manufacturing. 8 cycles of regeneration-reaction cycles were carried out successfully with little change on the product distribution, showing the great potential for continuous production of low-aromatic liquid oil. Catalyst characterization showed that the catalyst deactivation was primarily caused by coke deposition (approximately 16.0 wt%) on the surface of the catalysts, and oxidative regeneration was able to recover most of the pore structure and acidity of the zeolite by effectively removing coke. This study provides a better understanding for the plastic-to-naphtha process and even for scale-up studies.
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Affiliation(s)
- Leilei Dai
- Center for Biorefining and Department of Bioproducts and Biosystems Engineering, University of Minnesota, 1390 Eckles Ave., St. Paul, MN 55108, USA; State Key Laboratory of Food Science and Technology, Engineering Research Center for Biomass Conversion, Ministry of Education, Nanchang University, Nanchang 330047, China
| | - Nan Zhou
- Center for Biorefining and Department of Bioproducts and Biosystems Engineering, University of Minnesota, 1390 Eckles Ave., St. Paul, MN 55108, USA
| | - Yuancai Lv
- Center for Biorefining and Department of Bioproducts and Biosystems Engineering, University of Minnesota, 1390 Eckles Ave., St. Paul, MN 55108, USA
| | - Kirk Cobb
- Center for Biorefining and Department of Bioproducts and Biosystems Engineering, University of Minnesota, 1390 Eckles Ave., St. Paul, MN 55108, USA
| | - Paul Chen
- Center for Biorefining and Department of Bioproducts and Biosystems Engineering, University of Minnesota, 1390 Eckles Ave., St. Paul, MN 55108, USA
| | - Yunpu Wang
- State Key Laboratory of Food Science and Technology, Engineering Research Center for Biomass Conversion, Ministry of Education, Nanchang University, Nanchang 330047, China
| | - Yuhuan Liu
- State Key Laboratory of Food Science and Technology, Engineering Research Center for Biomass Conversion, Ministry of Education, Nanchang University, Nanchang 330047, China
| | - Rongge Zou
- Department of Biological Systems Engineering, Washington State University, Richland, WA 99354, USA
| | - Hanwu Lei
- Department of Biological Systems Engineering, Washington State University, Richland, WA 99354, USA
| | - Badr A Mohamed
- Department of Agricultural Engineering, Cairo University, Giza, Egypt
| | - Roger Ruan
- Center for Biorefining and Department of Bioproducts and Biosystems Engineering, University of Minnesota, 1390 Eckles Ave., St. Paul, MN 55108, USA.
| | - Yanling Cheng
- Center for Biorefining and Department of Bioproducts and Biosystems Engineering, University of Minnesota, 1390 Eckles Ave., St. Paul, MN 55108, USA; Biochemical Engineering College, Beijing Union University, No. 18, Fatouxili 3 Area, Chaoyang District, Beijing 100023, China.
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Tao J, Zhang J, Fan SB, Gao X, Ma Q, Zhao TS. Cocrystalline Synthesis of ZSM-5/ZSM-11 and Catalytic Activity for Methanol to Propylene. CRYSTAL RESEARCH AND TECHNOLOGY 2020. [DOI: 10.1002/crat.202000027] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Jiayi Tao
- State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering; Faculty of Chemistry and Chemical Engineering; National Chemical Experimental Teaching Demonstration Center; Ningxia University; Yinchuan 750021 China
| | - Jianli Zhang
- State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering; Faculty of Chemistry and Chemical Engineering; National Chemical Experimental Teaching Demonstration Center; Ningxia University; Yinchuan 750021 China
| | - Su-Bing Fan
- State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering; Faculty of Chemistry and Chemical Engineering; National Chemical Experimental Teaching Demonstration Center; Ningxia University; Yinchuan 750021 China
| | - Xinhua Gao
- State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering; Faculty of Chemistry and Chemical Engineering; National Chemical Experimental Teaching Demonstration Center; Ningxia University; Yinchuan 750021 China
| | - Qingxiang Ma
- State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering; Faculty of Chemistry and Chemical Engineering; National Chemical Experimental Teaching Demonstration Center; Ningxia University; Yinchuan 750021 China
| | - Tian-Sheng Zhao
- State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering; Faculty of Chemistry and Chemical Engineering; National Chemical Experimental Teaching Demonstration Center; Ningxia University; Yinchuan 750021 China
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