摘要
针对SiO_(2)作为CO_(2)甲烷化催化剂载体比表面积小、不利于活性组分高分散的问题,采用醇分散水解法将TiO_(2)均匀包覆于SiO_(2)纳米颗粒表面,制备了具有大比表面积的TiO_(2)-SiO_(2)载体。采用络合浸渍法将活性组分Ni担载于该载体表面得到Ni/TiO_(2)-SiO_(2)催化剂,并考察了Ni负载量和煅烧温度对催化性能及微观结构的影响。研究发现,载体比表面积大,Ni分散度较高,并且金属-载体相互作用起到了固定活性组分的作用,使其不容易在还原过程中烧结,所制得质量分数为12%的Ni/TiO_(2)-SiO_(2)催化剂具有优良的活性、选择性和稳定性。实验结果显示,CO_(2)转化率随Ni的表面积线性增大,说明Ni分散度是活性高低的决定性因素。
Titanium dioxide(TiO_(2))has low specific surface area as a CO_(2)methanation catalyst support,which affects the dispersion of active components.TiO_(2)was uniformly coated on the surface of silica(SiO_(2))particles using an alcohol dispersion hydrolysis method.Nickel(Ni)was loaded onto the synthesized TiO_(2)-SiO_(2)support with a high specific surface area using a complexation impregnation method that resulted in the Ni/TiO_(2)-SiO_(2)catalyst.Effects of Ni loading and calcination temperature on the catalytic performance and microstructure were examined.The study reveals that Ni does not easily sinter during the reduction process due to the large specific surface area of the support,higher dispersion of Ni,and metal-support interaction that immobilizes the active components.The resulting 12%Ni/TiO_(2)-SiO_(2)catalyst exhibits excellent activity,selectivity,and stability.Experimental results indicate that CO_(2)conversion rate increases linearly with the surface area of Ni,which indicates that Ni dispersion is the decisive factor for activity.
作者
葛陶晨曦
杨妍
姜雅楠
张弦
刘源
GE Taochenxi;YANG Yan;JIANG Yanan;ZHANG Xian;LIU Yuan(School of Chemical Engineering and Technology,Tianjin University,Tianjin 300354,China;Ordos Carbon Neutrality Research and Application Co.Ltd.,Ordos 014300,China)
出处
《高校化学工程学报》
北大核心
2025年第1期75-84,共10页
Journal of Chemical Engineering of Chinese Universities
基金
国家自然科学基金(21872101,21962014)
鄂尔多斯市重点研发计划(YF20232313)
鄂尔多斯市产业创新人才团队和山西省区域合作项目(202204041101029)。
关键词
二氧化碳甲烷化
镍基催化剂
镍负载量
煅烧温度
高分散
carbon dioxide
methanation
nickel-based catalyst
nickel loading
calcination temperature
high dispersion
