金属改性碳脱除PH3和H2S动力学及反应机理研究

为综合利用黄磷尾气中的CO，通过计算平均活化能和测定XPS、TG／DTA和氮吸附特性的方法，研究了Cu2＋和某金属离子M^n＋改性碳脱除PH，和H2S的动力学和反应机理问题。结果表明：H2S在金属改性碳上反应时平均活化能为134．4J／mol为-0．76级反应，PH，在金属改性碳上反应时平均活化能为1247．6J／mol为-0．8级反应；减小改性碳粒径增加流量可以显著提高其脱除PH，和H。S的速率；XPS、TG／DTA和孔径分布分析证明，改性碳净化H2S和PH3是一个催化吸附过程，H2S和PH3首先与氧在改性碳表面进行催化氧化反应，然后生成S和P2O5沉积吸附在改性碳表面。

Research on dynamics and reaction mechanism of PH3 and H2S removal by metallic modified activated carbon

In order to comprehensively utilize CO in yellow phosphorus off-gas, activated carbon （AC） modified with Cu2＋ and Mn＋ was used to remove PH3 and H2S from yellow phosphorus off-gas. XPS,TG/DTA and nitrogen adsorption were measured, and average activation energy was calculated to illustrate the dynamics and reaction mechanism. Reaction orders were -0. 8 and -0.76 for PH3 and H2S respectively; and average activation energies were 1 247.6 J/mol and 134.4 J/tool for PH3 and H2S respectively. Average reaction rate of PH3 and H2S on metallic AC （MMAC） increased markedly with the decrease of diameter and increase of flow rate. XPS, TGA, DTA and nitrogen adsorption indicated that the removal of PH3 and H2S by MMAC was a cata- lytic-adsorptive process, in which PH3 and H2S was firstly oxidized catalytically on the surface of MMAC, and then deposited and adsorbed on the surface.