氨氧化反应中铂铑钯合金热力学研究  

Researches on thermodynamics of PtRhPd alloy in ammonia oxidation

作　　者：刘欣 刘晓红 李志 时一春 

机构地区：[1]中海油太原贵金属有限公司,山西太原030006

出　　处：《工业催化》2012年第9期62-64,共3页Industrial Catalysis

摘　　要：依据铂铑钯贵金属的电子结构和催化活性关系,通过热力学计算得到标准状况下铂铑钯固溶体反应吉布斯自由能变和合金组态熵,推断870℃氨氧化反应中的铂铑钯固溶体形成条件。计算出△Gm(T)PtRh=-3 500.52<0,△Gm(T)RhPd=-3 229.34<0,△Gm(T)PtPd=-3 941.56<0。研究氨氧化反应过程中回收铂及形成表面固溶体的条件,得出T>300 K时铂钯形成固溶体可以继续参与氨氧化反应。使用场发射扫描电镜观察DEC产品与传统二元网表面形貌。The A Gm （T） and configurational entropy （ Sm） of Pt, Rh, Pd alloy were calculated according to the relationship between the electronic structure of Pt, Rh, Pd, catalytic activity and thermodynamics under the standard condition. The formation condition of PtRhPd solid solution was inferred in the ammox- idation at 870 ℃. The results of computation were as follows ： △ Gm （T） PtRh = - 3 500.52 〈 0, A Gm （T） RhPd = - 3 229.34 〈 0, A Gm （T） PtPd = - 3 941.56 〈 0. The conditions of platinum recovery and PtPd solid solution formation in the ammonia oxidation were studied. It was found that PtPd solid solution of the gauze surface was formed at the temperature 〉 300 K and could catalyze the ammonia oxidation. The sur- face morphologies of DEC product and traditional binary uauze were characterized by FESEM.

关 键 词：催化动力学 热力学 PtRhPd合金 氨氧化 固溶体 

分 类 号：O643.1[理学—物理化学] TQ013.1[理学—化学]