ZSM-5分子筛水热合成参数对VOCs吸附影响权重及机制探究
- Study on the Influence Weight and Mechanism of Hydrothermal Synthesis Parameters of ZSM-5 Molecular Sieve on VOCs Adsorption
- 基金项目：重2022247涂装工业挥发性有机污染物治理关键技术研发(JSGG20210802154804013)
- 摘要：工业涂装产生的VOCs废气组分复杂，而ZSM-5作为VOCs吸附剂，对于不同VOCs组分的吸附容量差距较大，所以为了提升ZSM-5分子筛对VOCs的吸附容量，本文考察了不同制备过程对ZSM-5吸附典型工业涂装VOCs(丙酮、苯、甲苯、苯乙烯、对二甲苯、乙酸丁酯)的吸附容量影响。基于Plackett-Burman(PB)筛选设计试验，探究了6种制备参数对吸附特性影响的权重，其中晶化温度对复杂组分中苯乙烯的吸附性能表现出最显著的影响。基于单因素试验，发现当晶化温度由100℃升高到190℃，苯乙烯的吸附量从2.68 mg/g明显提升至27.90 mg/g，这是由于晶化温度的升高有利于大量微孔及强酸位点的形成，使微孔表面积由259.85 m2/g增长至404.02 m2/g，强酸的酸量由0.042 mmol/g增加至0.302 mmol/g。本研究明确了制备参数的影响权重以及显著影响参数对于吸附组分及吸附量的影响机理，为复杂组分VOCs废气处理提供了针对性的调控策略。
- Abstract：The composition of volatile organic compounds (VOCs) emitted by the coating industry is highly complex. ZSM-5 is a typical adsorbent for VOCs, while its adsorption capacity varies significantly for different VOC components. In order to improve its overall adsorption capacity for complex VOCs, the effect of synthesis parameters on the adsorption of typical VOCs components (acetone, benzene, toluene, styrene, p-xylene, and butyl acetate) was investigated. The contributions of six synthesis parameters to adsorption performance were evaluated by Plackett-Burman (PB) design. Crystallization temperature exhibited the most significant influence on the adsorption performance of styrene among these VOCs. Further one-way experiments revealed that increasing the crystallization temperature from 100℃ to 190℃ significantly enhanced the adsorption capacity for styrene, rising from 2.68 mg/g to 27.90 mg/g. This improvement was attributed to the formation of more micropores and strong acid sites, with the micropore surface area increasing from 259.85 m2/g to 404.02 m2/g and the strong acid site concentration increasing from 0.042 mmol/g to 0.302 mmol/g. This study clarified the contributions of synthesis parameters and the influence mechanisms of the key factor on adsorption performance, providing a targeted strategy for addressing complex VOC emissions.
