水热处理对SAPO-34分子筛在MTO反应中的影响  

Effect of steaming treatment on the performances of SAPO-34 in MTO reaction

作　　者：王宝杰[1] 赵红娟[1] 李志庆 王久江[1] 滕秋霞[1] 杨周侠 Wang Baojie;Zhao Hongjuan;Li Zhiqing;Wang Jiujiang;Teng Qiuxia;Yang Zhouxia(Lanzhou Petrochemical Research Center,PetroChina,Lanzhou,Gansu,China;Jingbo Petrochemical Company Ltd.,Bingzhou,Shandong,China)

机构地区：[1]中国石油兰州化工研究中心 [2]山东京博石油化工有限公司

出　　处：《石油与天然气化工》2018年第5期45-50,57,共7页Chemical engineering of oil & gas

摘　　要：对SAPO-34分子筛在800℃、质量分数为100%水蒸气下进行0～100h水热老化。结果表明:随着老化时间的延长,相对结晶度呈下降趋势;总比表面积下降了59.6m^2/g,微孔比表面积下降了95.0m^2/g。NH_3-TPD酸性测试表明,老化后SAPO-34的酸量大幅下降,尤其是强酸量下降幅度更大。在水热处理0～45h内,酸性的变化尤为明显,而水热处理45h以后,酸量变化幅度明显减少。固定床评价结果显示,在水热处理45h之内,MTO反应中SAPO-34分子筛的寿命明显增加,但低碳烯烃的选择性未有改变,水热处理45h以后,寿命几乎不变,但低碳烯烃的选择性明显变好,乙烯和丙烯收率最高可提高7.43%。SAPO-34 was undergone by hydrothermal treating with 800℃,100 w%steam for 0-100 h.XRD results showed that the relative crystallinity was decreased with the increase of the hydrothermal treating time.The BET surface area was decreased by 59.6 m 2/g and micropore surface area decreased by 95.0 m 2/g with treating time increased from 0 h to 100 h.NH 3-TPD indicated that when hydrothermal treating time was between 0~45 h,the total acidities sharply deceased,especially the strong acidities.After 45 h,the change of acidities was little.Fixed bed reaction tests showed that when hydrothermal treating time was between 0~45 h,the catalytic life of SAPO-34 was prolonged over two times,while the selectivity for C=2+C=3remained nearly the same with SAPO-34 untreated.After 45 h,the selectivity for C=2+C=3 was improved greatly but catalyst life didn’t chang.The yield of C=2+C=3 was up to 7.43%.

关 键 词：MTO SAPO-34 低碳烯烃 水热处理 

分 类 号：TQ221.2[化学工程—有机化工] TQ426