摘要
以聚乙二醇(PEG)作为分散剂,采用溶胶-凝胶法制备了镧离子修饰的SiO2负载型磷钼酸催化剂La-Mo/SiO2,并对其进行了FT-IR、XRD、SEM和比表面积及孔隙结构分析等表征。结果表明,制备中引入分散剂PEG及镧离子改性后,催化剂保持了磷钼酸的Keggin结构,同时促进了MoO3在SiO2表面的高度分散,催化剂的比表面积和孔体积也得到提高。在H2O2氧化脱硫体系中考察了不同制备条件下的催化剂及体系反应条件对模型油脱硫效率的影响。结果显示,最佳条件下合成催化剂且在其用量0.05g、氧化剂H2O2用量0.20mL、反应温度70℃时,二苯并噻吩(DBT)反应3h的脱除率为95.2%,苯并噻吩(BT)反应5h的脱除率为59.2%。
La-Mo/SiO2 composite was prepared by the sol-gel method using PEG as the dispersing agent. The catalyst was characterized by means of Fourier transform infrared spectroscopy （FT-IR）, X-ray diffraction （XRD）, scanning electron microscope （SEM） and pore structure parameters. The results showed that the catalyst kept the Keggin structures and promoted the high dispersion of MoO3 over SiO2 with the modification of La^3＋ , and increased the specific surface area and pore volume of the catalyst. The effects of catalysts prepared under different conditions and reaction conditions on oxidative desulfurization of model oil were investigated with hydrogen peroxide as oxidant. The desulfurization rates of dibenzothiophene （DBT） and benzothiophene （BT） can be up to 95.2% and 59.2% for 3 h and 5 h, respectively,with the conditions of catalyst 0. 05 g, H2O2 0. 20 mL and reaction temperature 70 ℃.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2013年第12期75-79,共5页
Materials Reports
基金
高等学校博士学科点专项科研基金(20114219120002)
湖北省教育厅科研项目(Q20111104)
关键词
磷钼酸
溶胶-凝胶法
分散剂
氧化脱硫
phosphomolybdic acid, sol-gel method, dispersing agent, oxidative desulfurization
