Flame combustion synthetic method for primary preparation of NSR catalysts

• Main Authors: GAO WENGUI, CHEN DONGHUA, WENG JIAFENG, ZHU XIAOQIN, DAI YONGNIAN, HU JIN, SHEN LI, GUO YUZHONG
• Format: Patent
• Language: Chinese; English
• Published: 27.01.2010
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR RELEVANT APPARATUS; TRANSPORTING

The invention discloses a flame combustion synthetic method for primary preparation of NSR catalysts, comprising the steps: adopting metal organic compounds as a precursors; dissolving the metal organic compounds in an organic solvent; dissolving the organic compounds of platinum family metal and alkaline earth metal in the same solvent by a double-nozzle method; introducing the organic compounds into the same nozzle; dissolving the organic compound of metal aluminum in the solvent; introducing the other nozzle and simultaneously combusting. The high dispersibility of atomized liquid at a gas phase state and high-temperature and high-speed performance in gas phase combustion are skillfully applied, and a high-performance NSR catalytic material is obtained by selecting different precursors. The corresponding speed of a catalyst on NOx is effectively enhanced and the conversion quantity is raised. The prepared NSR catalyst has large specific surface area, high catalytic activity, high thermal stability and stro