摘要
以三嵌段共聚物P123为模板剂,采用静电纺丝法制备了多孔Ni/SiO2催化剂,考察其在CO甲烷化中的催化性能。采用N2物理吸脱附测试、扫描电子显微镜(SEM)、X射线衍射(XRD)、H2-程序升温还原(H2-TPR)、透射电子显微镜(TEM)、热重分析(TGA)对催化剂的结构性质进行表征。结果表明,静电纺丝法制备的多孔Ni/SiO2催化剂活性组分Ni在SiO2载体纤维上高度分散,比表面积大,Ni颗粒尺寸小,金属与载体相互作用强,在CO甲烷化反应中表现出优异的催化活性和稳定性。在温度450℃,压力0.1MPa,质量空速15000ml/(g·h)条件下,多孔Ni/SiO2催化剂CO转化率最高可达96.4%,CH4选择性可达86.4%。此方法为工业上制备高催化活性且无须二次成型的甲烷化催化剂提供了新思路。
Porous Ni/SiO2 catalysts were prepared by electrospinning using P123 as template and the catalytic performance in CO methanation was evaluated.The synthesized catalyst was characterized by N2 physisorption measurements,scanning electron microscopy(SEM),X-ray diffraction(XRD),hydrogen temperature-programmed reduction(H2-TPR),transmission electron microscopy(TEM)and thermogravimetric analysis(TGA).The results showed that Ni particles were highly dispersed on the silica nanofibers.The presence of pore structure in electrospun fibers immensely increased the specific surface area.Moreover,the porous Ni/SiO2 catalyst exhibited small particle size and strong metal-support interaction,which led to excellent catalytic activity with 96.4%CO conversion and 86.4%CH4 selectivity at 450°C under 0.1 MPa with a WHSV of 15000 ml/(g·h).The 100-hour lifetime test indicated that the porous Ni/SiO2 catalyst had excellent stability.This method provides a new idea for the industrial preparation of methanation catalysts with high catalytic activity and without secondary molding.
作者
何璐铭
辛忠
高文莉
顾佳
孟鑫
HE Luming;XIN Zhong;GAO Wenli;GU Jia;MENG Xin(Shanghai Key Laboratory of Multiphase Materials Chemical Engineering,School of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China;State Key Laboratory of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China)
出处
《化工学报》
EI
CAS
CSCD
北大核心
2020年第11期5007-5015,共9页
CIESC Journal
基金
国家自然科学基金项目(U1203293,21776091,21808062)
中央高校基本科研业务费专项资金(22A1817025)
上海市领军人才计划项目(2013)。
