摘要
采用光化学还原法,在复合半导体基础上表面作进一步钯改性,制备了钯锡改性的纳米二氧化钛光催化剂Pd-SnO2/TiO2,以二氧化碳光催化还原反应为探针,对催化剂进行了评价,并与复合半导体基础上,表面铜改性光催化剂的光催化还原性能进行了比较。结果表明,表面钯改性、二氧化碳光催化还原产物只检测到甲醇,这说明,复合半导体基础上钯的沉积,比铜掺杂更有利于深度还原产物甲醇的生成。结合XRD、XPS、TEM等催化剂表征结果,对钯锡改性纳米二氧化钛光激发机制进行了讨论,提出了二氧化碳光催化还原的可能机制。
Nano titanium dioxide modified by palladium and tin,denoted by Pd-SnO2/TiO2,was prepared by photochemical reduction of Pd2＋ on the SnO2/TiO2 composite semiconductor support.Photocatalytic reduction of carbon dioxide was chosen as a probe reaction to investigate the performances of the photocatalyst,and the difference of photocatalytic behaviors between the Pd-SnO2/TiO2 and the SnO2/TiO2 modified by copper（CuOx-SnO2/TiO2） was discussed.The results showed that methanol was the only product in the reduction of carbon dioxide on Pd-SnO2/TiO2,however,three reduction products were detected when the reaction occured on CuOx-SnO2/TiO2.The difference in products indicates that the capability of photocatalytic reduction of Pd-SnO2/TiO2 is more powerful than that of CuOx-SnO2/TiO2.On the basis of the characterization results from XRD,XPS and TEM,the mechanism of photo-excitation on Pd-SnO2/TiO2 was discussed and a possible mechanism of carbon dioxide photocatalytic reduction was proposed.
出处
《天然气化工—C1化学与化工》
CAS
CSCD
北大核心
2011年第3期26-29,共4页
Natural Gas Chemical Industry
