ZSM-5的表面酸性对模拟高炉煤气吸附脱硫性能的影响  

Effect of surface acidity of ZSM-5 on the adsorptive desulfurization of blast furnace gas

作　　者：刘孝 王琛 马静红 程文萍[2] 廖俊杰 李瑞丰 LIU Xiao;WANG Chen;MA Jinghong;CHENG Wenping;LIAO Junjie;LI Ruifeng(State Key Laboratory of Clean and Efficient Coal Utilization,College of Chemical Engineering and Technology,Taiyuan University of Technology,Taiyuan 030024;College of Chemistry,Taiyuan University of Technology,Taiyuan 030024;Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering,Taiyuan 030024)

机构地区：[1]太原理工大学化学工程与技术学院,省部共建煤基能源清洁高效利用国家重点实验室,太原030024 [2]太原理工大学化学学院,太原030024 [3]山西浙大新材料与化工研究院,太原030024

出　　处：《环境科学学报》2024年第1期167-174,共8页Acta Scientiae Circumstantiae

基　　金：山西浙大新材料与化工研究院技术开发项目(No.2022SX-TD014)。

摘　　要：随着超低排放要求的发布及工业生产过程的优化,高炉煤气的深度脱硫势在必行.本研究选用4个ZSM-5沸石分子筛,研究ZSM-5的表面酸性对其在模拟高炉煤气气氛中脱硫性能的影响.同时,采用XRD、SEM-ED5、^(29)Si MAS NMR、N_(2)吸/脱附和NH_(3)-TPD表征ZSM-5沸石分子筛的理化性质,并采用固定床装置评价其在模拟高炉煤气气氛中的H_(2)S脱除性能.结果表明,在模拟高炉煤气中,ZSM-5沸石分子筛具备较好的脱硫能力,随着硅铝比和钠铝比的升高,ZSM-5沸石分子筛的酸量和酸强度的降低,其H_(2)S穿透硫容也随之降低,H_(2)S的穿透硫容最高可达2.21 mg·g^(-1).进一步的研究表明,ZSM-5沸石分子筛的H_(2)S穿透硫容与中强酸和强酸的量有关,其中,强酸量的影响更大,其吸附H_(2)S的机理为羟基吸附机理.The desulfurization of blast furnace gas(BFG)is imperative due to the strict regulation of the ultra-low sulfur emission and the optimal industrial processes required recently.In this study,the effects of surface acidity on desulfurization performance in simulated BFG on four ZSM-5 zeolite molecular sieves were investigated.The physical and chemical properties of ZSM-5 were characterized by XRD,SEM-EDS,^(29)Si MAS NMR,N_(2)adsorption and NH_(3)-TPD,and the H_(2)S removal were evaluated in a fixed bed reactor using the simulated BFG.The results showed that ZSM-5 present a good desulfurization capacity using simulated BFG.With the increase of silica/alumina ratio and sodium/alumina ratio,the acid strength and the acid amount of ZSM-5 decreased,and the breakthrough sulfur capacity decreased simultaneously.Meanwhile,the highest breakthrough sulfur capacity of 2.21 mg·g^(-1)was observed on sample Z1.Further research indicates that the breakthrough sulfur capacity is correlated with the amount of the medium and strong acid on ZSM-5,especially the amount of strong acid,and H_(2)S adsorption mechanism is supposed to be the hydroxyl adsorption mechanism.

关 键 词：ZSM-5 高炉煤气 H_(2)S脱除 吸附脱硫 

分 类 号：X701.3[环境科学与工程—环境工程]