摘要
多级孔硅铝材料因优异的性能而成为金属催化剂的重要载体。研究采用水热法以硝酸铝为铝源、正硅酸乙酯(TEOS)为硅源合成了Al掺杂SiO2(Al-SiO2)的多级孔材料,然后采用等体积浸渍法负载钴,制备了具有多级孔结构的Co/Al-SiO2催化剂。对Al-SiO2材料的表征结果表明:以四丙基氢氧化铵(TPAOH)为结构导向剂,经80℃水热处理可以合成多级孔Al-SiO2,呈尺寸在30~40 nm范围的“蠕虫状”大孔分布形态。将催化剂用于费–托合成反应,与商业SiO2负载的钴催化剂相比,Co/Al-SiO2的CO转化率提高近一倍,CH4选择性降低19.3wt%,C2-C4选择性降低13.3wt%,汽油段产物(C5-C12)选择性达到53.3wt%。
Hierarchically porous silica-aluminum is an important support material for metal-catalysts,because of its excellent properties.Herein,an efficient hydrothermal approach for the production of hierarchical aluminumdoped silica(Al-SiO2)architectures was reported by employing aluminum nitrate as an aluminium source and TEOS as silicon source.Effects of the structure-oriented agent on the structure of Al-SiO2 were investigated.Structural features of Al-SiO2 were characterized by XRD,SEM and N2-physisorption.The results showed that hierarchical Al-SiO2 with"worm-like"porous of 30–40 nm can be synthesized by using TPAOH as the structure-oriented agent and hydrothermal treatment at 80℃.The cobalt catalysts were prepared by the wetness impregnation method.Compared with commercial SiO2 supported cobalt catalysts,the Fischer-Tropsch synthesis performance of the catalyst Co/Al-SiO2 is significantly enhanced,i.e.,CO conversion nearly doubled,CH4 selectivity reduced by 19.3wt%,C2-C4 selectivity reduced by 13.3wt%,and the selectivity of gasoline products(C5-C12)reached 53.3wt%.
作者
王举汉
文雄
刘成超
张煜华
赵燕熹
李金林
WANG Juhan;WEN Xiong;LIU Chengchao;ZHANG Yuhua;ZHAO Yanxi;LI Jinlin(Hubei Key Laboratory of Catalysis and Materials Science,Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education,South-Central University for Nationalities,Wuhan 430074,China)
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2020年第9期999-1004,共6页
Journal of Inorganic Materials
基金
国家自然科学基金(21972170,21902187)
湖北省自然科学基金(2018CFB365)。
关键词
水热法
多级孔材料
Al-SiO2
钴催化剂
费–托合成
hydrothermal method
hierarchical porous materials
Al-SiO2
Cobalt catalyst
Fischer-Tropsch synthesis
