Hydrogen Production by Catalytic Gasification of Coal in Supercritical Water

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• 作者：Rihua Lan ; Hui Jin ; Liejin Guo ; Zhiwei Ge ; Simao Guo ; Ximin Zhang
• 刊名：Energy & Fuels
• 出版年：2014
• 出版时间：November 20, 2014
• 年：2014
• 卷：28
• 期：11
• 页码：6911-6917
• 全文大小：413K
• ISSN：1520-5029

文摘

A high-throughput batch reactor system was designed for hydrogen production by catalytic gasification of bituminous coal in supercritical water. The experimental system was made up of six subsystems with the same parameters, which was designed with a maximum temperature and pressure of 750 掳C and 30 MPa, respectively. The system ensures that a maximum of six series experiments are conducted at the same time, which promotes the efficiency of the experimental work. In this study, the experiments were conducted under different operational conditions: temperature of 600鈥?50 掳C, pressure of 23鈥?5 MPa, feed concentration of 5鈥?0 wt %, reaction time of 4鈥?5 min, and K₂CO₃ addition rate of 0鈥?00 wt %. The effects of operational conditions were examined. The results obtained show that the carbon gasification efficiency (CE) and gasification efficiency (GE) increased with decreasing feed concentration and increasing temperature, reaction time, and K₂CO₃ addition rate. The addition of K₂CO₃ promoted the gasification reactivity significantly. CE and GE in the catalytic case were about 1.7 and 2 times that in the non-catalytic case, respectively. Kinetic information on catalytic gasification of coal in supercritical water was experimentally investigated. The activation energy and pre-exponential factor obtained were 59.47 卤 4.87 kJ/mol and 43.89 卤 1.82 min^鈥?, respectively.