Highly efficient photocatalytic reduction of CO2 is essential for solving the greenhouse effect and energy crisis.In this paper,the Sm-TiO2 nanocomposites were successfully prepared via sol-gel method.The CO2 photored...Highly efficient photocatalytic reduction of CO2 is essential for solving the greenhouse effect and energy crisis.In this paper,the Sm-TiO2 nanocomposites were successfully prepared via sol-gel method.The CO2 photoreduction activities of synthesized samples were tested under irradiation for 6 h and the results indicate that the 0.5% Sm-TiO2 catalyst has superior performance and stability.The CO and CH4 yields of0.5% Sm-TiO2 catalyst are 55.47 and 3.82 μmol/g·cat respectively,which are 5.02 and 2.67 times the yield of TiO2.The possible mechanism of Sm doped TiO2 was investigated through comprehensive characterization and photoetectrochemical analysis,After the Sm doping,the photo-generated electrons in TiO2 could migrate to Sm 4 f,and some of them can be captured by reducing Sm3+ o Sm2+,which can lower the recombination rate of electron and hole pairs.Therefore,the enhanced photocatalytic performance could be ascribed to large specific surface area,fast separation rate of electron-hole pairs and high visible light response.This report provides some meaningful attempts in researching the CO2 photocatalytic reduction.展开更多
在微波辐射下,以稀土复合固体超强酸SO42-/TiO2/Sm3+为非均相催化剂,对环己醇与乙酸酐之间的酰化反应进行了研究.重点考察了催化剂用量、醇酐物质的量比、微波功率和辐射时间对乙酸环己酯收率的影响.实验结果表明,衔土复合固体超强酸SO4...在微波辐射下,以稀土复合固体超强酸SO42-/TiO2/Sm3+为非均相催化剂,对环己醇与乙酸酐之间的酰化反应进行了研究.重点考察了催化剂用量、醇酐物质的量比、微波功率和辐射时间对乙酸环己酯收率的影响.实验结果表明,衔土复合固体超强酸SO42-/TiO2/Sm3+有着良好的催化活性,当乙酸酐的加入量为0.1 mol,醇酐物质的量比为2.4∶1.0,催化剂用量为反应物总量的1.0%,微波炉功率为385 W,辐射时间15 m in,在此优化条件下,乙酸环己酯收率可达95.3%,且催化剂重复使用6次仍保持较高活性.所得产品无色透明,具有很高的纯度,并对产品进行了折光率和红外光谱的表征.展开更多
基金Project supported by the National Key R&D Program of China(2018YFB0605002)the National Natural Science Foundation of Shanghai(14ZR1417800)。
文摘Highly efficient photocatalytic reduction of CO2 is essential for solving the greenhouse effect and energy crisis.In this paper,the Sm-TiO2 nanocomposites were successfully prepared via sol-gel method.The CO2 photoreduction activities of synthesized samples were tested under irradiation for 6 h and the results indicate that the 0.5% Sm-TiO2 catalyst has superior performance and stability.The CO and CH4 yields of0.5% Sm-TiO2 catalyst are 55.47 and 3.82 μmol/g·cat respectively,which are 5.02 and 2.67 times the yield of TiO2.The possible mechanism of Sm doped TiO2 was investigated through comprehensive characterization and photoetectrochemical analysis,After the Sm doping,the photo-generated electrons in TiO2 could migrate to Sm 4 f,and some of them can be captured by reducing Sm3+ o Sm2+,which can lower the recombination rate of electron and hole pairs.Therefore,the enhanced photocatalytic performance could be ascribed to large specific surface area,fast separation rate of electron-hole pairs and high visible light response.This report provides some meaningful attempts in researching the CO2 photocatalytic reduction.
文摘在微波辐射下,以稀土复合固体超强酸SO42-/TiO2/Sm3+为非均相催化剂,对环己醇与乙酸酐之间的酰化反应进行了研究.重点考察了催化剂用量、醇酐物质的量比、微波功率和辐射时间对乙酸环己酯收率的影响.实验结果表明,衔土复合固体超强酸SO42-/TiO2/Sm3+有着良好的催化活性,当乙酸酐的加入量为0.1 mol,醇酐物质的量比为2.4∶1.0,催化剂用量为反应物总量的1.0%,微波炉功率为385 W,辐射时间15 m in,在此优化条件下,乙酸环己酯收率可达95.3%,且催化剂重复使用6次仍保持较高活性.所得产品无色透明,具有很高的纯度,并对产品进行了折光率和红外光谱的表征.
