硝酸生产用的Pt-Pd-Rh催化剂表面状态研究

贵金属, 1999, (1): 1-9. doi: 10.3969/j.issn.1004-0676.1999.01.001

硝酸生产用的Pt-Pd-Rh催化剂表面状态研究

宁远涛 ^1, , 杨正芬 ^2, , 赵怀志 ^3, , 胡新 ^4,

1.昆明贵金属研究所,中国,昆明,650221

2.昆明贵金属研究所,中国,昆明,650221

3.昆明贵金属研究所,中国,昆明,650221

4.昆明贵金属研究所,中国,昆明,650221

基金项目: 中国科学院资助项目(59271027)

关键词：硝酸 , 催化剂 , Pt-Pd-Rh合金 , 表面状态

Research on Surface State of Pt-Pd-Rh Catalysts Used in Nitric Acid Preparation

借助于CA,ICP-AES和XPS测定了在常压综合法氨氧化装置中使用的Pt-Pd-Rh合金系催化网的组成与表面状态的变化.随着催化网使用时间延长,Pt的体积浓度降低,Fe和Ca污染增大.催化网表层中主组元的化学状态为Pt°,Pd°,Rh°,RhO2和Rh2O3.催化网表面Pt明显贫化,而Pd和Rh相对富集.在合金中增高Pd的浓度,可降低Pt的损耗,降低表面Rh2O3浓度,因而有利于提高氨转换率.

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硝酸生产用的Pt-Pd-Rh催化剂表面状态研究

Research on Surface State of Pt-Pd-Rh Catalysts Used in Nitric Acid Preparation

参考文献