硅钨酸为钨源制备介孔WO_(3)/SiO_(2)催化剂的研究  

Study on the Preparation of Mesoporous WO_(3)/SiO_(2)Catalysts Using Silicotungstic Acid as Tungsten Source

作　　者：张兰芬 赵茹玉 张敬唯 向晓蓉 李颢[1] Zhang Lanfen;Zhao Ruyu;Zhang Jingwei;Xiang Xiaorong;Li Hao(College of Chemistry and Environmental Engineering,Yangtze University,Jingzhou 434023,China)

机构地区：[1]长江大学化学与环境工程学院,湖北荆州434023

出　　处：《云南化工》2024年第10期111-115,共5页Yunnan Chemical Technology

摘　　要：以硅钨酸为钨源,稻壳为硅源和介孔模板,通过等体积浸渍法制备了一系列不同WO_(3)负载量的介孔WO_(3)/SiO_(2)催化剂。通过XRD、UV-Vis和N_(2)吸附-脱附等温线的手段对样品进行了表征。结果表明,当w(WO_(3))低于2.4%时,样品中的WO_(3)晶粒在载体SiO_(2)上分散较好;当w(WO_(3))高于2.4%时,样品中开始出现单斜晶系的WO_(3)晶体。样品具有较大的比表面积和明显的介孔结构,最可几孔径为3.6 nm。在优化的氧化脱硫条件下,质量分数为2.4%的WO_(3)/SiO_(2)样品给出了99.7%的二苯并噻吩转化率和99.6%的4,6-二甲基二苯并噻吩转化率。Using silicotungstic acid as tungsten source,rice husk as both silicon source and mesoporous template,a series of mesoporous WO_(3)/SiO_(2)catalysts with different WO_(3)loadings were prepared by an incipient-wetness impregnation method.The samples were characterized by means of XRD,UV-Vis and N_(2)adsorption-desorption isotherms.The results showed that,when the WO_(3)loading was lower than 2.4%,the WO_(3)grains in the samples were well dispersed on the carrier SiO_(2).When the WO_(3)loading was higher than 2.4%,monoclinic WO_(3)crystals began to appear in the samples.The samples had a large specific surface area and a pronounced mesoporous structure,and the most probable pore size of samples was 3.6 nm.Under optimized oxidative desulfurization conditions,the 2.4%WO_(3)/SiO_(2)sample gave a dibenzothiophene conversion of 99.7%and a 4,6-dimethyldibenzothiophene conversion of 99.6%.

关 键 词：硅钨酸 稻壳 WO_(3)/SiO_(2) 氧化脱硫 

分 类 号：O643.3[理学—物理化学]