MTO废弃催化剂资源化利用制备A型分子筛  

Resource Utilization of MTO Spent Catalysts to Prepare Type A Molecular Sieve

作　　者：齐升东 孙晓雪 王德举[1] 刘丽[1] QI Shengdong;SUN Xiaoxue;WANG Deju;LIU Li(State Key Laboratory of Green Chemical Engineering and Industrial Catalysis,Shanghai Research Institute of Petrochemical Technology,Shanghai 201208,SINOPEC,China)

机构地区：[1]中国石油化工股份有限公司上海石油化工研究院,绿色化工与工业催化国家重点实验室,上海201208

出　　处：《化学反应工程与工艺》2022年第6期509-514,533,共7页Chemical Reaction Engineering and Technology

基　　金：国家重点研发计划(2018YFC1803303,2018YFC1803304,2022YFA1503504);国家自然科学基金区域创新发展联合基金(U20A20122)。

摘　　要：采用硝酸溶液对甲醇制低碳烯烃(MTO)废弃催化剂进行预处理,通过调控浸出过程的液固比、硝酸浓度以及浸出温度等,控制浸出固渣硅铝物质的量比(Si/Al)约为1、磷的浸出率大于90%。对利用浸出固渣作为硅铝原料制备A型分子筛进行了系统研究。结果表明:通过碱熔活化-水热晶化可将固渣成功转化为A型分子筛。加入固渣量为60%(质量分数)的氢氧化钠,于450℃下碱熔活化3 h,在水渣比为5和晶化温度为80℃的条件下晶化24 h,制备的A型分子筛静态水吸附容量不低于24%,达到一等品4A分子筛活化粉的性能标准。Methanol to olefins(MTO)spent catalysts were pretreated with the nitric acid solution.By adjusting the ratio of solid to liquid,nitric acid concentration and leaching temperature,the molar ratio of Si to Al(Si/Al)of leaching slag was about 1,and the leaching rate of phosphorus was greater than 90%.The preparation of zeolite A using slag as raw materials was systematically studied.The results showed that the slag could be successfully converted into zeolite A through alkali fusion-hydrothermal crystallization under conditions of 60%dosage of NaOH in slag,alkali-activated at 450℃for 3 h followed crystallization for 24 h at 80℃with the water-slag ratio of 5.The static water adsorption rate of the prepared zeolite A was more than 24%,which reached the first-class of 4A molecular sieve activated powder.

关 键 词：甲醇制低碳烯烃 废弃催化剂 硝酸溶液 固渣 碱熔活化 A型分子筛 

分 类 号：X705[环境科学与工程—环境工程] TQ426.95[化学工程]