Research progress on synthesis and modification of solid waste-based ZSM-5
In the industrial production process,a large amount of fly ash,red mud,and coal gasification slag is generated.The accumula-tion of these wastes not only occupies land but also severely damages the ecological environment and endangers human health.These three types of solid waste all contain silicon and aluminum elements,with relatively high contents and significant fluctuations in the silicon-to-aluminum ratio(molar ratio of silicon dioxide to aluminum oxide).ZSM-5(Zeolite Socony Mobil 5)is a type of zeolite molecular sieve with a wide range of silicon-to-aluminum ratios,featuring a unique pore structure and good stability,widely used in adsorption and catal-ysis.Utilizing silicon-aluminum-rich solid waste to prepare ZSM-5 is one of the important ways to achieve high-value and resource-effi-cient utilization.The general methods for activation and impurity removal pretreatment of silicon-aluminum-rich solid waste were systemat-ically summarized.Based on the physical and chemical properties of fly ash,red mud,and coal gasification slag,the research progress on the synthesis of solid waste-based ZSM-5 and its metal modification,phosphorus modification,hydrothermal modification,and acid-base modification were reviewed.The effects of using solid waste as a silicon-aluminum source on the synthesis,structure,and perform-ance of ZSM-5 were analyzed,highlighting the importance of regulating the silicon-to-aluminum ratio,removing and transforming impuri-ty elements,and understanding the migration and transformation rules of major elements during the activation and impurity removal process.The impact mechanisms of different modification methods on the structure and performance of ZSM-5 were discussed.The distri-bution of silicon and aluminum in the framework and non-framework,the content and forms of impurity elements like iron and calcium,and the pore structure were emphasized as crucial factors influencing the modification outcomes.Through analyzing and discussing the ex-isting problems and research status in the synthesis and modification of typical silicon-aluminum-rich solid waste-based ZSM-5,the fu-ture development should focus on the co-utilization of multiple sources of solid waste such as fly ash,red mud,and coal gasification slag,and the hydrothermal crystallization preparation of ZSM-5 under conditions without inorganic or no template agents.Efficient and pre-cise modification of solid waste-based ZSM-5 is highlighted as the future direction.
coal fly ashred mudcoal gasification slagpretreatment of solid wastesynthesis of ZSM-5modification of ZSM-5
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