硝酸工业氨氧化反应铂合金催化网的百年发展:Ⅱ.氨氧化铂合金催化网的性质、表面状态和结构再造  

The Centennial Development of Platinum Alloy Catalytic Gauzes for Ammonia Oxidation in Nitric Acid Plants:Ⅱ.Performances,Main Species and Reconstruction of Platinum Alloy Catalytic Gauzes

作　　者：宁远涛[1] 

机构地区：[1]昆明贵金属研究所,云南昆明650106

出　　处：《贵金属》2008年第4期41-46,54,共7页Precious Metals

摘　　要：评述了Pt—Rh、Pt—Pd—Rh和Pt—Pd—Rh—RE合金催化网的应用性能、结构再造和失活方面的问题。在Pt—Rh合金中添加Pd组元或在Pt—Pd—Rh合金中增大Pd的浓度或添加微量RE元素，可使氨转化率在原合金基础上再提高1．0～1．5％，并可一定程度降低铂耗率和氨耗率，减轻了催化网的腐蚀和表面结构再造的程度。分析了铂合金催化网的表面化学状态和结构再造及其机制，讨论了铂合金催化网的瞬态高热反应与失活效应。The application performances, main chemical species and reconstruction of Pt - Rh, Pt - Pd - Rh and Pt - Pd - Rh - RE alloy catalytic gauzes were reviewed. Adding Pd or RE components in Pt - Rh or Pt - Pd - Rh alloys, or increasing the content of Pd component in the alloys, can increase about 1.0% -1.5% of the ammonia conversion rate, decrease the platinumloss rate and ammonia consumption rate, and reduce the extent of corrosion and reconstruction of the platinum alloy catalytic gauzes. The chemical species of main components on surface and sub - surface and the reconstruction mechanism of the catalytic gauzes were analyzed. The transient high heat reactions and deactivation of the catalytic gauzes in the high pressure ammonia oxidation equipment were discussed.

关 键 词：合金材料 铂合金 催化网 氨转化率 铂耗 氨耗 结构再造 

分 类 号：TG146.33[一般工业技术—材料科学与工程]