Hydrogen-rich syngas production by catalytic cracking of tar in wastewater under supercritical condition |
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| Affiliation: | 1. Institute of Energy and Power Engineering, Zhejiang University of Technology, Hangzhou, 310014, China;2. Center of Excellence in Environmental Catalysis and Adsorption, Faculty of Engineering, Thammasat University, Pathumthani, 12120, Thailand;3. Zhejiang Energy Group R&D, Hangzhou, 310026, China;4. Institute of Process Equipment and Control Engineering, Zhejiang University of Technology, Hangzhou, 310032, China;1. CNR-ISC, U.O.S. Sapienza, Piazzale A. Moro 5, 00185, Roma, Italy;2. Dipartimento di Chimica, Università di Roma La Sapienza, Piazzale Aldo Moro 5, 00185, Roma, Italy;3. Dipartimento Fusione e Tecnologie per la Sicurezza Nucleare, ENEA, Via E. Fermi 45, 00044, Frascati, (RM), Italy;1. Institute of Energy and Power Engineering, Zhejiang University of Technology, Hangzhou 310014, China;2. Zhejiang Carbon Neutral Innovation Institute, Zhejiang University of Technology, Hangzhou 310014, China;3. Center of Excellence in Environmental Catalysis and Adsorption, Faculty of Engineering, Thammasat University, Pathumthani 12120, Thailand;4. Jeffrey Sachs Center on Sustainable Development, Sunway University, Bandar Sunway 47500, Malaysia;5. Graphene & Advanced 2D Materials Research Group (GAMRG), School of Engineering and Technology, Sunway University, Bandar Sunway 47500, Malaysia;1. School of Chemistry, College of Science, University of Tehran, Tehran, Iran;2. Department of Energy Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran;3. Gas Research Department, Research Institute of Petroleum Industry, Tehran, Iran;1. Xi''an University of Technology, NO.5 South Jinhua Road, Xi''an, Shaanxi, 710048, PR China;2. Key Laboratory of Thermo-Fluid Science and Engineering of MOE, Xi''an Jiaotong University, No.28, Xianning West Road, Xi''an, Shaanxi, 710049, PR China;3. Jinneng Group Co., Ltd., No.82 Kaihuasi Street, Taiyuan, Shanxi, 030002, PR China |
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| Abstract: | This paper presents the results from experimental study of syngas production by catalytic cracking of tar in wastewater under supercritical condition. Ni/Al2O3 catalysts were prepared via the ultrasonic assisted incipient wetness impregnation on activated alumina, and calcined at 600 °C for 4 h. All catalysts showed mesoporous structure with specific surface area in a range of 146.6–215.3 m2/g. The effect of Ni loading (5–30 wt%), reaction temperature (400–500 °C), and tar concentration (0.5–7 wt%) were systematically investigated. The overall reaction efficiency and the gas yields, especially for H2, were significantly enhanced with an addition of Ni/Al2O3 catalysts. With 20%Ni/Al2O3, the H2 yield increased by 146% compared to the non-catalytic experiment. It is noteworthy that the reaction at 450 °C with the addition of 20%Ni/Al2O3 had a comparable efficiency to the reaction without catalyst at 500 °C. The maximum H2 yield of 46.8 mol/kgtar was achieved with 20%Ni/Al2O3 at 500 °C and 0.5 wt% tar concentration. The catalytic performance of the catalysts gradually decreased as the reuse cycle increased, and could be recovered to 88% of the fresh catalyst after regeneration. 20%Ni/Al2O3 has a potential to improve H2 production, as well as a good reusability. Thus, it is considered a promising catalyst for energy conversion of tar in wastewater. |
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| Keywords: | Catalytic Tar cracking Supercritical water Syngas Hydrogen |
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