载钯TiO_2半导体悬浮催化体系中CO_2的光还原

PHOTOREDUCTION OF CO 2 IN THE SUSPENSION SYSTEM OF SEMICONDUCTOR CATALYST TiO 2 MODIFIED BY PALLADIUM

在半导体光催化还原ＣＯ２的反应过程中，一般都伴有氢气的产生［１，２］．为了提高ＣＯ２还原产物的收率，必须设法抑制析氢过程．在催化剂表面担载某种吸氢物质是抑制氢气产生的有效方法之一．理想的吸氢物质不仅能吸附氢，且被其吸附的氢还具有还原ＣＯ２的能力．Ｇｏ...

The experiment of photoreduction of CO 2 was made in the suspension system of Pd/TiO 2 under the illumination of visible light. The findings from the experiments are: (1) Formic acid is the major product of the photoreduction process and its quantum yield is relatively high; (2) The reaction rate increases with the increase of the illumination intensity as well as the feed flowrate of CO 2. It can also be increased by adding an electron donor to the system and the increasing capacity is in the sequence of Na 2C 2O 4>Na 2SO 3>NaH 2PO 2; (3) The photoreduction process was found to be an opposing reaction by dynamics analysis. A model of reaction mechanism, by which the calculated result consisted well with the experimental one, was proposed.