科研之友
微信
新浪微博
Facebook
分享链接
摘要
Porous monolithic gels based on silica with pore size from 16 nm to 3-5 mu m have been synthesized using sol-gel technology. Parameters of porous structure are determined by the components molar ratio in the reaction mixture. The reduction processes of silver ions by formamide in the synthesized porous gel were studied. It has been shown that at the initial stage of the reaction, silver particles with size up to 10 nm are formed in the absence of any stabilizers. The composites Ag/SiO2 were synthesized by means of the threefold impregnation of porous monoliths using the solution of silver nitrate in the mixture of methanol and formamide. Their catalytic activity in the CO oxidation was studied. It was discovered that after activation in oxygen and hydrogen the samples display a low temperature activity, which depends on the number of Si-O-nonbridging oxygen groups on the surface of silica porous monoliths.
- 出版日期2013-12
