催化合金Pt—Pd—Rh—M四元系的结构与性能

研究了Ｐｔ－Ｐｄ－Ｒｈ－Ｍ四元合金的结构、力学性能和氧化挥发特性。与Ｐｔ－１０Ｒｈ和Ｐｔ－４Ｐｄ－３．５Ｒｈ氨氧化催化合金比较，四元合金具有结构单一稳定、晶粒细化、再结晶温度高、室温与高温力学性能高以及氧化挥发失重小的特点，适合于作氨氧化催化合金，还讨论Ｐｔ－Ｐｄ－Ｒｈ系催化合金中Ｐｄ的作用及机制。

The Structure and Properties of the Quarternary Catalyst Alloy(Pt-Pd-Rh-M)

The structure and some properties, such as the mechanical properties as well as oxidation and volatilization, of a new quarternary alloy based on Pt-Pd-Rh-M system, were studied in the present paper. Comparing with Pt-10Rh and Pt-4Pd-3.5Rh catalyst alloys for ammonia oxidation, the quarternary alloy has simple and stable structure, finer crystal grains, higher recrystallization temperature, higher mechanical properties at ambient and elevated temperatures, and lower rates of PtO 2 formation and weight loss caused by volatilization. The quarternary alloy is suitable for application as catalyst for ammonia oxidation. The role and the mechanism of Pd in the quarternary alloy were discussed.