Mg改性CuZnAlY催化剂对CO_(2)加氢制甲醇性能影响  

Effect of Mg modified CuZnAlY catalyst on the performance of CO_(2)hydrogenation to methanol

作　　者：王雷 崔海涛[2] 李国强 李枫[2] 李彪 刘刚[1] 李磊[2] WANG Lei;CUI Haitao;LI Guoqiang;LI Feng;LI Biao;LIU Gang;LI Lei(College of Chemistry and Chemical Engineering,Taiyuan University of Technology,Taiyuan 030024,China;State Key Laboratory of Coal Conversion,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001,China)

机构地区：[1]太原理工大学化学与化工学院,山西太原030024 [2]中国科学院山西煤炭化学研究所,煤炭高效低碳利用全国重点实验室,山西太原030001

出　　处：《洁净煤技术》2025年第3期72-82,共11页Clean Coal Technology

基　　金：山西省重点研发计划资助项目(202202090301013,202102090301008);江苏省人才攻关联合体建设资助项目((2024)LHT2024018-03);山西省科技创新人才团队专项资助项目(202204051001012);山西煤化所自主创新项目-基础研究资助项目(SCJC-DT-2023-03);天津市科技计划资助项目(22YFYSHZ00290)。

摘　　要：CO_(2)加氢制备甲醇是实现“双碳”目标的重要途径,通过添加不同含量的Mg对CuZnAlY催化剂进行改性,并系统研究了其对CO_(2)加氢制甲醇性能的影响。通过XRD、TPR、TPD和XPS等表征手段对催化剂结构特征进行了系统分析。结果表明,Mg的添加构筑了合适的碱性位点,增强了CO_(2)吸附能力,提升了CO_(2)转化率和甲醇选择性。其中CZAYM_(2.5)复合催化剂时空产率最高,在T=250℃,P=3.0 MPa,GHSV=4000 mL/(mL·h),反应气n(H2)∶n(CO_(2))=3∶1(物质的量比)条件下,CO_(2)转化率、甲醇选择性和甲醇时空产率分别达到了18.95%、51.49%和0.1549 g/(g·h)。在提高反应压力P=5.0 MPa条件下进行了720 h稳定性试验。结果表明:CO_(2)转化率达到了22.00%,CH_(3)OH选择性保持在63.00%左右,时空产率保持在0.2100 g/(g·h)左右,催化剂表现出良好的稳定性能。CO_(2)hydrogenation to methanol is an important way to achieve the goal of"double carbon".In this paper,CuZnAlY catalyst was modified by adding different contents of Mg,and its effect on the performance of CO_(2)hydrogenation to methanol was systematically studied.XRD,TPR,TPD and XPS were used to analyze the structure of the catalyst.The results showed that the addition of Mg built a suitable alkaline site,enhanced the CO_(2)adsorption capacity,improved the CO_(2)conversion and methanol selectivity.Among them,CZAYM_(2.5) composite catalyst has the highest space-time yield.Under the conditions of T=250℃,P=3.0 MPa,GHSV=4000 mL/(mL·h),reaction gas H2∶CO_(2)=3∶1(molar ratio),the CO_(2)conversion,methanol selectivity and methanol space-time yield reached 18.95%,51.49%and 0.1549 g/(g·h),respectively.Meanwhile,stability tests were carried out for 720 h at improved pressure P=5.0 MPa.The results showed that:the CO_(2)conversion reached 22.00%,the selectivity of CH_(3)OH was about 63.00%,and the methanol space-time yield was about 0.2100 g/(g·h).The catalyst showed good stability.

关 键 词：CO_(2)排放 CO_(2)加氢 甲醇 复合催化剂 Mg改性 

分 类 号：TQ426[化学工程]