水热处理对SAPO-34分子筛在合成气一步法制烯烃反应中性能的影响  

Effect of hydrothermal treatment on performances of SAPO-34 zeolites in direct conversion of syngas to light olefins

作　　者：尚蕴山 刘意 陈昊源 韦慧 段雪蕾 冯波 邢爱华 季生福[3] SHANG Yunshan;LIU Yi;CHEN Haoyuan;WEI Hui;DAUN Xuelei;FENG Bo;XING Aihua;JI Shengfu(National Institute of Clean-and-low-carbon Energy,Beijing 102211,China;College of Electrical Engineering,North China Electric Power University,Beijing 102206,China;State Key Laboratory of Chemical Resource Engineering,Beijing University of Chemical Technology,Beijing 102209,China)

机构地区：[1]北京低碳清洁能源研究院,北京102211 [2]华北电力大学电气与电子工程学院,北京102206 [3]北京化工大学化工资源有效利用国家重点实验室,北京102209

出　　处：《天然气化工—C1化学与化工》2022年第3期73-80,共8页Natural Gas Chemical Industry

摘　　要：对SAPO-34分子筛在700℃、质量分数为100%的水蒸汽下进行水热处理,采用XRD、NH;-TPD及固体MAS-NMR等表征分析了水热处理对分子筛的结构、酸性的影响。结果表明,SAPO-34分子筛在水热处理过程中结晶度提高,Si(4Al)物种逐渐向Si(3Al)物种转变,SAPO-34分子筛酸强度增加。固定床评价结果显示,SAPO-34分子筛经水热处理12 h后与ZnCr_(2)O_(4)制得的双功能催化剂(BS-12)在合成气一步法制烯烃反应中性能最佳,CO转化率约为23%,C_(2)^(=)~C_(2)^(=)的烯烃选择性约为75%。长周期实验显示,催化剂运行120 h无明显失活。SAPO-34 zeolites were hydrothermally treated by water steam with a mass fraction of 100%under 700℃.Fresh and hydrothermally treated SAPO-34 zeolites were characterized by XRD,NH;-TPD and solid-state MAS-NMR to investigate the effects of hydrothermal treatment conditions on the structure and acidity of SAPO-34 zeolites.The results show that the crystallinity of SAPO-34 zeolites increases,Si(4Al) species gradually transform to Si(3Al) species,and acid strength of SAPO-34 zeolites increases during hydrothermal treatment.The results of fixed-bed evaluation show that the bifunctional catalyst (BS-12) prepared by mixing ZnCr_(2)O_(4)and SAPO-34 after 12 h of hydrothermal treatment,has the best reaction performance in direct conversion syngas to light olefins reaction.The CO conversion and C_(2)^(=)-C_(2)^(=)selectivity in hydrocarbon is about 23% and 75%,respectively.The long period experiment shows that the catalyst has no obvious deactivation after 120 h running.

关 键 词：SAPO-34分子筛 水热处理 合成气 烯烃 硅分布 酸性质 

分 类 号：TQ241[化学工程—有机化工] O643.36[理学—物理化学]