铂-二氧化钛纳米复合物的超重力技术组装制备及催化加氢性能
|
摘要
利用超重力技术将具有相同表面电荷的两种材料铂纳米粒子与二氧化钛纳米粒子组装成了铂-二氧化钛复合物。元素分析结果表明,与自然吸附法相比,超重力法所得金属铂的负载量由0.13%上升为0.83%。超重力技术所制得的纳米复合物比常规法制备所得催化剂对硝基苯加氢具有更高的催化加氢活性,其活性由0.48s~(-1)升高至0.79s~(-1)。该结果表明,超重力条件下得到的纳米复合物中铂与二氧化钛有更强的金属-载体相互作用;同时,超重力技术所得纳米复合物具有更高的催化性能稳定性,其周转数达到40000r时,硝基苯转化率仍可达96%以上,高于常规法所得催化剂上硝基苯的转化率(92%)。
The Pt-TiO_2 nanocomposites were fabricated from Pt nanoparticles and TiO_2 nanoparticles with the same surface charges via supergravity technology.The elemental analysis results revealed that the loading percentage of Pt(0.83%)on TiO_2 via supergravity technology was higher than that via natural adsorption(0.13%).The catalytic hydrogenation activitie(0.79 s~(-1))over the nanocomposites prepared with supergravity technology were higher than that with regular method(0.48 s~(-1)),revealing the stronger metal-support interaction between Pt and TiO_2 via supergravity condition than that via regular method.Meanwhile,the nanocomposites prepared with supergravity technology had higher catalytic stability than that prepared with regular method.When the turnover number reached 40000,the conversion of nitrobenzene can remain up to 96%,which is higher than that on the catalyst prepared with regular method(92%).
The Pt-TiO_2 nanocomposites were fabricated from Pt nanoparticles and TiO_2 nanoparticles with the same surface charges via supergravity technology.The elemental analysis results revealed that the loading percentage of Pt(0.83%)on TiO_2 via supergravity technology was higher than that via natural adsorption(0.13%).The catalytic hydrogenation activitie(0.79 s~(-1))over the nanocomposites prepared with supergravity technology were higher than that with regular method(0.48 s~(-1)),revealing the stronger metal-support interaction between Pt and TiO_2 via supergravity condition than that via regular method.Meanwhile,the nanocomposites prepared with supergravity technology had higher catalytic stability than that prepared with regular method.When the turnover number reached 40000,the conversion of nitrobenzene can remain up to 96%,which is higher than that on the catalyst prepared with regular method(92%).
引文
[1]Kacar R,Mucur S P,Yildiz F.et al.Solution processed ternary blend nano-composite charge regulation layer to enhance inverted OLED performances[J].Applied Physics Letters,2018,112(16):163302.
[2]Szczepanik B.Photocatalytic degradation of organic contaminants over clay-TiO2 nanocomposites:A review[J].Applied Clay Science,2017(141):227.
[3]Doluda V Y,Tereshchenkov A Yu.Catalytic nitrobenzene hydrogenation in supercritical carbon dioxide[J].Russian Journal of Physical Chemistry B,2015,8(7):958.
[4]于婷婷,安宏乐.浸渍法制备La-Al-SBA-15介孔分子筛及其催化合成棕榈酸甲酯[J].天津化工,2018,32(5):18.
[5]Wang J,Yuan C K.Effect of the nanostructure and the surface composition of bimetallic Ni-Ru nanoparticles on the performance of CO methanation[J].Applied Surface Science,2018(441):816.
[6]Vichaphund S,Aht-ong D.Production of aromatic compounds from catalytic fast pyrolysis of Jatropha residues using metal/HZSM-5prepared by ion-exchange and impregnation methods[J].Renewable Energy,2015(79):28.
[7]曾东,李振虎.超重力技术的应用研究[J].石油化工,2018,47(7):763.
[8]孙继良.超重力技术的应用与研究进展[J].炼油与化工,2012,23(6):14.
[9]Vargas M,M E Rincon,E Ramos.Formation and characterization of TiO2/CNT nanomaterials dried under supergravity conditions[J].Journal of Nanomaterials,2009(2009):879016.
[10]官益豪,黄卫星,肖泽仪,等.超重力技术及其应用研究进展[J].化工机械,2005(1):55.
[11]赵祥迪,孙万付,徐银谋,等.超重力技术在危化品气体处理中的应用[J].安全、健康和环境,2016,16(7):1.
[12]LI Xin,WANG Yue.Deficient copper decorated platinum nanoparticles for selective hydrogenation of chloronitrobenzene[J].Journal of Materials Chemistry A,2017,5(22):11294.
[13]赵梦梦,陈梦寅,张鹏举,等.负载型V2O5-WO3/NiO-TiO2脱硝催化剂上Ni组分的催化作用[J].粉末冶金工业,2019,29(1):59.
[14]何翡翡,李静,聂敏,等.三聚氰胺甲醛-乙二胺四草酰乙酸/纳米碳管复合物修饰电极测定重金属离子Pb(II)、Cd(II)和Zn(II)[J].金属功能材料,2013,20(3):36.
[2]Szczepanik B.Photocatalytic degradation of organic contaminants over clay-TiO2 nanocomposites:A review[J].Applied Clay Science,2017(141):227.
[3]Doluda V Y,Tereshchenkov A Yu.Catalytic nitrobenzene hydrogenation in supercritical carbon dioxide[J].Russian Journal of Physical Chemistry B,2015,8(7):958.
[4]于婷婷,安宏乐.浸渍法制备La-Al-SBA-15介孔分子筛及其催化合成棕榈酸甲酯[J].天津化工,2018,32(5):18.
[5]Wang J,Yuan C K.Effect of the nanostructure and the surface composition of bimetallic Ni-Ru nanoparticles on the performance of CO methanation[J].Applied Surface Science,2018(441):816.
[6]Vichaphund S,Aht-ong D.Production of aromatic compounds from catalytic fast pyrolysis of Jatropha residues using metal/HZSM-5prepared by ion-exchange and impregnation methods[J].Renewable Energy,2015(79):28.
[7]曾东,李振虎.超重力技术的应用研究[J].石油化工,2018,47(7):763.
[8]孙继良.超重力技术的应用与研究进展[J].炼油与化工,2012,23(6):14.
[9]Vargas M,M E Rincon,E Ramos.Formation and characterization of TiO2/CNT nanomaterials dried under supergravity conditions[J].Journal of Nanomaterials,2009(2009):879016.
[10]官益豪,黄卫星,肖泽仪,等.超重力技术及其应用研究进展[J].化工机械,2005(1):55.
[11]赵祥迪,孙万付,徐银谋,等.超重力技术在危化品气体处理中的应用[J].安全、健康和环境,2016,16(7):1.
[12]LI Xin,WANG Yue.Deficient copper decorated platinum nanoparticles for selective hydrogenation of chloronitrobenzene[J].Journal of Materials Chemistry A,2017,5(22):11294.
[13]赵梦梦,陈梦寅,张鹏举,等.负载型V2O5-WO3/NiO-TiO2脱硝催化剂上Ni组分的催化作用[J].粉末冶金工业,2019,29(1):59.
[14]何翡翡,李静,聂敏,等.三聚氰胺甲醛-乙二胺四草酰乙酸/纳米碳管复合物修饰电极测定重金属离子Pb(II)、Cd(II)和Zn(II)[J].金属功能材料,2013,20(3):36.