Optimum reductants ratio for CO2 reduction by overlapped Cu/TiO2
Optimum reductants ratio for CO2 reduction by overlapped Cu/TiO2
复制标题
DOI：
10.3934/matersci.2019.2.214
复制
发表时间：
2019-01-01
影响因子：
1.8
通讯作者：
Hu, Eric
中科院分区：
文献类型：
--
作者：
Nishimura, Akira;Toyoda, Ryuki;Hu, Eric
采用溶胶-凝胶法、浸涂法和脉冲电弧等离子体法相结合制备了Cu掺杂TiO2(Cu/TiO2)薄膜光催化剂。研究了Cu/TiO2光催化剂对H2O和H-2还原剂CO2还原性能的影响。此外，本研究还研究了将两个涂覆在网状玻璃纤维盘上的 Cu/TiO2 重叠，以有效利用光并增加用于二氧化碳减排的光催化剂的量。采用SEM、EPMA、TEM和EELS对制备的网状玻璃纤维Cu/TiO2薄膜进行了表征。此外，分别在有或没有紫外（UV）光的氙灯照射下测试了Cu/TiO2薄膜的CO2还原性能。结果表明，在CO2/H-2/H2O = 1:0.5:0.5条件下，有紫外光照射和无紫外光照射时，均取得了最佳的CO2还原性能。在紫外光照射条件下，Cu/TiO2重叠的CO最高浓度是单个Cu/TiO2的1.4倍，而Cu/TiO2重叠的CH4的最高浓度是单个Cu/TiO2的1.7倍。在无紫外光照射的条件下，重叠的Cu/TiO2光催化剂单位重量CO的最高摩尔质量是单个Cu/TiO2光催化剂的1.1倍。产生CO的CO2/H2O或CO2/H-2的理论摩尔比为1:1，而产生CH4的CO2/H2O或CO2/H 2 的理论摩尔比为1:4。由于CO2/H-2/H2O的摩尔比=1:0.5:0.5可以视为CO2/总还原剂的摩尔比=1:1，因此认为本研究的结果遵循CO2/H2O和CO2/H-2的反应方案。
Cu-doped TiO2 (Cu/TiO2) film photocatalyst was prepared by combination of sol-gel and dip-coating process, and pulse arc plasma method. The effect of Cu/TiO2 photocatalyst on CO2 reduction performance with reductants of H2O and H-2 was investigated. In addition, this study investigated overlapping two Cu/TiO2 coated on netlike glass fiber discs in order to utilize the light effectively as well as increase the amount of photocatalyst used for CO2 reduction. The characterization of prepared Cu/TiO2 film coated on netlike glass fiber was analyzed by SEM, EPMA, TEM and EELS. Furthermore, the CO2 reduction performance of Cu/TiO2 film was tested under illumination of Xe lamp with or without ultraviolet (UV) light, respectively. As a result, the best CO2 reduction performance has been achieved under the condition of CO2/H-2/H2O = 1:0.5:0.5 with UV light illumination as well as without UV light illumination. Under the illumination condition with UV light, the highest concentration of CO for Cu/TiO2 overlapped is 1.4 times as large as that for single Cu/TiO2, while the highest concentration of CH4 for Cu/TiO2 overlapped is 1.7 times as that for single Cu/TiO2. Under the illumination condition without UV light, the highest molar quality of CO per weight of photocatalyst for Cu/TiO2 overlapped is 1.1 times as that for single Cu/TiO2. The theoretical molar ratio of CO2/H2O or CO2/H-2 to produce CO is 1:1, while the theoretical molar ratio of CO2/H2O or CO2/H 2 to produce CH4 is 1:4. Since the molar ratio of CO2/H-2/H2O = 1:0.5:0.5 can be regarded as the molar ratio of CO2/total reductants = 1:1, it is believed that the results of this study follow the reaction schemes of CO2/H2O and CO2/H-2.