摘要
本文采用光还原法将Pt沉积到钙钛矿LaCoO3的表面制备出Pt-LaCoO3系列催化剂,通过光催化还原二氧化碳来评价催化剂的活性。考察不同牺牲剂对光沉积影响,由XRD、XPS和SEM表征分析表明,在LaCoO3上光沉积的铂颗粒以Pt、Pt(OH)2和PtO2的形式存在,空穴捕捉剂有助于Pt的还原和提高Pt颗粒的分散度,而Pt的还原程度主要取决于与钙钛矿LaCoO3导带电子能级和PtCl62-/Pt还原电势的大小。负载后催化剂的光催化活性提高,这是由于Pt负载到钙钛矿LaCoO3表面能够有效地防止光生电子和空穴在表面的复合。
The Pt-LaCoO3 photocatalysts with Pt loading were prepared by the photodeposition method on different conditions. The photoeatalytie activity was investigated for reduction of carbon dioxide. The catalysts were characterized by XRD, SEM and XPS. The results indicate that the Pt, Pt （Oil） 2 and PtO2 species deposited on the surface of Pt-LaCoO3, the hole scavenger could enhance the reduetive degree of ehloroplatinie acid and the decentralization of platinum, but the reduction of ehloroplatinie acid was mainly decided by the electron potential energy on conduction band and the redox potential of PtCl6^2-/Pt. The photoeatalytie activity for reduction of carbon dioxide enhanced, because Pt species could prevent the combination of e^- and h^ ＋.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2008年第4期672-676,680,共6页
Bulletin of the Chinese Ceramic Society
基金
国家863计划项目(2007AA03Z347)
关键词
钙钛矿
负载
光催化
二氧化碳
perovskite
load
photocatalysis
carbon dioxide
