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本文以多晶铂-10％铑丝为催化剂,研究了氨催化氧化生成氧化亚氮的反应动力学.在静态反应体系中,采用Fourier变换红外光谱仪连续监测反应过程中NH_3和N_2O的压力变化,测得仅生成N_2O(无NO或N_2)的热丝温度范围为250～350℃.在NH_3和O_2混合气体总压力为20～300 Torr范围内,测得反应速率对NH_3分压呈一级,对O_2分压呈半级关系.该反应的动力学方程式为v=k_(app)P_(NH_3)·P_(O_2)~(1/2).通过测定不同温度下氨催化氧化反应的表观速率常数,求得表观活化能为25kcal/mol.用Eley-Rideal机理对该催化反应进行了解释,认为控制反应速率的主要一步可能是气相中氨分子与化学吸附在表面上的氧原子间的反应.
In this paper, polycrystalline platinum -10% rhodium wire as a catalyst to study the catalytic oxidation of ammonia to form nitrous oxide reaction kinetics.In the static reaction system, Fourier transform infrared spectroscopy continuous monitoring of the reaction process of NH 3 and N 2 O pressure changes, The results showed that the temperature of the hot filament that only produced N 2 O (NO or N 2) ranged from 250 to 350 ° C. The total reaction pressure of NH 3 and O 2 was 20-300 Torr, The partial pressure of O2 is half-order, and the kinetic equation of the reaction is v = k_ (app) P_ (NH_3) · P_ (O_2) ~ (1/2) .According to the determination of apparent ammonia catalytic oxidation reaction at different temperatures The apparent activation energy was calculated to be 25 kcal / mol. The Eley-Rideal mechanism was used to explain the catalytic reaction. It is believed that the main step to control the reaction rate may be that the ammonia molecules in the gas phase and the oxygen atoms on the surface chemically adsorbed Reaction.