RESEARCH PROGRESS ON APPLICATION OF CATALYSTS IN HYDROTHERMAL CARBONIZATION PROCESS OF BIOMASS
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摘要: 在追求废弃物资源化利用的过程中,生物质转化技术受到广泛关注。水热碳化法目前被认为是将高含水率生物质转化为生物炭的最有效技术之一,其与传统的热解炭相比,获得的水热炭具有灰分低、热值高、比表面积大、吸附能力强等特点。然而,生物质原料的差异需要更高的能耗优化,以此提高水热炭产率和性能。添加催化剂可以克服这一问题,对提高原料的反应速率及水热炭热稳定性具有重要意义,但少有文献归纳总结催化剂在生物质水热碳化过程中的应用。将催化剂分为盐类、酸类、金属氧化物、沸石和组合催化5种类型,探讨添加催化剂对水热炭产率和理化性质的影响,分析各类催化剂的催化反应机理,总结其在水热碳化中的催化特点,并讨论了催化剂在生物质水热碳化中未来重点研究方向。Abstract: In the process of pursuing the recycling of waste, biomass conversion technology has received extensive attention. Hydrothermal carbonization is considered as one of the most effective technologies for converting high moisture-content biomass into biochar. Compared with traditional pyrolysis carbon, hydrothermal carbon has the characteristics of low ash content, high calorific value, large specific surface area, and strong adsorption capacity. However, the differences in biomass raw materials require higher energy consumption optimization to improve the yield and properties of hydrothermal carbon. The addition of catalysts can solve this problem, which is of great significance for improving the reaction rate of raw materials and the thermal stability of hydrothermal carbon, but the application of catalysts in the hydrothermal carbonization process of biomass is rarely summarized. This paper divides catalysts into five types: salts, acids, metal oxides, zeolites, and combined catalysis. The effects of catalyst addition on hydrothermal carbon yield and physicochemical properties are discussed, the mechanisms of different types of catalytic reactions are analyzed, and the catalytic characteristics in hydrothermal carbonization are summarized. Finally, the future key research directions of catalysts in hydrothermal carbonization of biomass are proposed.
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Key words:
- biomass /
- hydrothermal carbonization /
- catalyst /
- hydrothermal carbon yield
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