超声浸渍制备钒催化剂催化氧化SO_2性能的研究
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摘要
以硅藻土为载体,分别采用浸渍法、混碾法和超声浸渍法制备钒催化剂V/SiO_2-Imp、V/SiO_2-Mix和V/SiO_2-Uimp,利用SEM、MIP、EDS、XRD和TG/DSC对钒催化剂进行表征分析,并用固定床反应器测定了钒催化剂催化氧化SO2的活性。结果表明,超声浸渍法制备钒催化剂V/SiO_2-Uimp结构完整、表面孔道清晰、孔容较大、活性组分分散均匀且晶体尺寸较小、熔融相变温度较低,使得该催化剂催化氧化SO2的转化率较高。
The vanadium catalysts V/SiO_2-Imp,V/SiO_2-Mix and V/SiO_2-Uimp with diatomiteas support were prepared by impregnation method,mixed-milling method and ultrasonic impregnation method respectively,and characterized by SEM,MIP,EDS,XRD and TG/DSC. The oxidation activity for sulfur dioxide were investigated in a fixed bed reactor. Results showed that V/SiO_2-Uimp had complete structure,clear surface pores,large pore volume,uniform dispersion of active components,small crystal size and low melt transition temperature,which made the conversion rate of V/SiO_2-Uimp catalyze the oxidation of sulfur dioxide was higher.
The vanadium catalysts V/SiO_2-Imp,V/SiO_2-Mix and V/SiO_2-Uimp with diatomiteas support were prepared by impregnation method,mixed-milling method and ultrasonic impregnation method respectively,and characterized by SEM,MIP,EDS,XRD and TG/DSC. The oxidation activity for sulfur dioxide were investigated in a fixed bed reactor. Results showed that V/SiO_2-Uimp had complete structure,clear surface pores,large pore volume,uniform dispersion of active components,small crystal size and low melt transition temperature,which made the conversion rate of V/SiO_2-Uimp catalyze the oxidation of sulfur dioxide was higher.
引文
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[2]郭坤,宋存义,常冠钦,等.超声波浸渍法制备V2O5-WO3/Ti O2选择性催化还原脱硝催化剂[J].环境工程,2013,31(2):76-79.
[3]杨永辉,林彦军,冯俊婷,等.超声浸渍法制备Pd/Al2O3催化剂及其催化蒽醌加氢性能[J].催化学报,2006,27(4):304-308.
[4]张继光.催化剂制备过程技术[M].北京:中国石化出版社,2011:16-25.
[5]李春喜,宋红艳,王子镐.超声波在化工中的应用与研究进展[J].石油学报,2001,17(3):86-94.
[6]闪俊杰,杜振雷,李青,等.超声波在化学工业中的应用[J].河北工业科技,2009,26(2):127-130.
[7]王颖,吴丹,马来波,等.超声波在化学工业中的应用与研究进展[J].盐科学与化工,2017,46(3):1-4.
[8] Yahyavi S R,Haghighi M,Shafiei S,et al. Ultrasound-assisted synthesis and physicochemical characterization of Ni-Co/Al2O3-MgO nanocatalysts enhanced by different amounts of MgO used for CH4/CO2reforming[J]. Energy Conversion&Management,2015,97:273-281.
[9] Zhu L,Zhang L,Qu H,et al. A study on chemisorbed oxygen and reaction process of Fe-CuOX/ZSM-5 via ultrasonic impregnation method for low-temperature NH3-SCR[J]. Journal of Molecular Catalysis A Chemical,2015,409:207-215.
[10] Dou J,Yu J,Tahmasebi A,et al. Ultrasonic-assisted preparation of highly reactive Fe-Zn sorbents supported on activated-char for desulfurization of COG[J]. Fuel Processing Technology,2015,135:187-194.
[11]邓红,韦藤幼,童张法.超声浸渍法制备吗啉催化剂及其催化性能[J].化工进展,2015,34(2):425-429.
[12]孙剑峰.超声浸渍法、溶胶凝胶法制备高温煤气脱硫剂[D].杭州:浙江大学,2010:27-30.
[13]周晓峰,程庆龄,陶跃武,等.超声浸渍对费托合成Co/Zr/Si O2催化剂性能的影响[J].催化学报,2011,32:1156-1165.
[14]王祖兴,郑小明.压汞法研究硅藻土和沸石的孔结构[J].非金属矿,1989(6):7-9.
[15]田华,张水昌,柳少波,等.压汞法和气体吸附法研究富有机质页岩孔隙特征[J].石油学报,2012,33(3):419-427.
[16] Niu X,Gao J,Wang K,et al. Influence of crystal size on the catalytic performance of H-ZSM-5 and Zn/H-ZSM-5in the conversion of methanol to aromatics[J]. Fuel Processing Technology,2017,157:99-107.
[17] Madsen R S K,Motuzas J,Vaughan J,et al. Fine control of Na Cl crystal size and particle size in percrystallisation by tuning the morphology of carbonised sucrose membranes[J]. Journal of Membrane Science,2018,567:157-165.
[18] Wang J,Shao L,Wang C,et al. Controllable preparation of various crystal size and nature of intra-crystalline diffusion in Cu/SSZ-13 NH3-SCR catalysts[J]. Journal of Catalysis,2018,367:221-228.
[19] Chen Z,Pan H,Lin Q,et al. The modification of Pd coresilica shell catalysts by functional molecules(KBr,CTAB,SC)and their application to the direct synthesis of hydrogen peroxide from hydrogen and oxygen[J]. Catal Sci Technol,2017,7(6):1415-1422.
[20] Hu P,Pan H,Lin Q,et al. Modified with transition metals(Cu,Fe,Ni,Co)as efficient deoxidizers for O2removal from low-concentration coal bed methane[J]. Energy&Fuels,2018,32(5):6136-6143.
[21]陈振兴.高活性低温钒催化剂的研制及其应用基础研究[D].长沙:中南大学,2002:5-9.
[22]郭少辉.粒度和形貌对纳米颗粒热力学性质影响的理论研究和量化计算[D].太原:太原理工大学,2015:2-4.
[23]赵培玲.纳米晶金属材料的热力学性质研究[D].沈阳:东北大学,2013:2-5.
[24] Loskyll J,Stwe K,Maier W F. Search for new catalysts for the oxidation of SO2[J]. Acs Combinatorial Science,2013,15(9):464.