节点文献
氧对氨在Pt/α-Al2O3催化剂上吸附和解离性能的影响
O2 Effect on the Adsorption and Decomposition of Ammonia on Pt/α-Al2O3 Catalyst at Low Temperature
【摘要】 利用瞬态脉冲技术考察了氨在Pt/Al2O3催化剂表面的吸附、脱附和氧化动力学.结果表明,氨在Pt/Al2O3表面存在两种吸附态:可逆吸附和不可逆吸附.吸附在催化剂表面的氧和体相中的氧促进了氨的分解和氧化.不同的氧物种和反应温度影响产物的分布.体相晶格氧物种是可能形成水的重要因素,而表面氧物种是氮氧化物NO、N2O形成的主要来源.在氧存在的条件下低温有利于氨分解形成N2、N2O,而高温有利于NO的生成.
【Abstract】 TAP (temporal analysis of products) experiments show that NH3 dissociation is considerably promoted by the presence of oxygen. Different oxygen species influence product distribution. Chemisorbed oxygen species is favorable for the formation of NO and N2O. N2O is the main product at low temperatures. Bulkdissolved oxygen species (platinum oxide) is less active for ammonia oxidation, which may be responsible for the formation of H2O.
【关键词】 Pt;
氨氧化;
TAP反应器;
瞬态动力学;
【Key words】 platinum; ammonia oxidation; TAP reactor; instantaneous kinetics;
【Key words】 platinum; ammonia oxidation; TAP reactor; instantaneous kinetics;
【基金】 国家自然科学基金资助项目(20076045)
- 【文献出处】 复旦学报(自然科学版) ,Journal of Fudan University , 编辑部邮箱 ,2003年03期
- 【分类号】O643.3
- 【被引频次】5
- 【下载频次】130