TiO_2纳米带光催化二氧化碳甲烷化

Photocatalytic Methanation of CO_2 over TiO_2 Nanoribbons

研究了在常温常压下TiO2纳米带光催化CO2催化加氢气反应。在紫外光照射下,二氧化碳的加氢还原产物为甲烷。利用高分辨TEM,XRD,UV-Vis DRS,低温氮吸附-脱附,TG等考察了催化剂与甲烷产率的构效关系。结果表明,在600℃焙烧时得到的双晶材料具有最佳的光催化活性。优异的光催化活性主要得益于TiO2双晶脱水纳米带(DNR Bicrystalline dehydratednanoribbon)。上面形成的纳米晶界能够提高催化剂在紫外区的光吸收能力,TiO2(B)和锐钛矿独特的双晶间隔结构也提高了界面电荷分离的效率。担载贵金属Pt显著地提高了反应速率。

The photocatalytic hydrogenation of CO2 over TiO2 bicrystalline dehydrated nanoribbons（DNR） was investigated at normal temperature and pressure.Under UV irradiation,generation of methane via CO2 hydrogenation was observed.Quantitative structure-activity relationship（QSAR） of photocatalysts and methane production rate was correlated,based on results of high-resolution TEM,XRD,UV-Vis DRS,nitrogen adsorption-adsorption,thermal gravimetric（TG） studies.The results indicate that bicrystalline photocatalyst obtained at 600 ℃ exhibits the highest photoactivity.Excellent photocatalytic activity could be mainly attributed to the enhanced absorption in UV region by nano-cavities of DNR,and the unique alternative bicrystalline structure of TiO2（B） and anatase in the samples,which could improve the efficiency of interfacial charge separation.Supporting of Pt significantly increases the reaction rate.