Catalytic oxidation of CO in gases emitted by industrial processes and vehicle exhaust

Abstract

A new type of catalysts not containing noble metal oxides have been developed and the possibilities of their application both for the complete neutralization of carbon monoxide in exhaust gases and the process of deep oxidation of volatile hydrocarbons are studied. It has been found that the activity of catalysts based on vanadium and phosphorus oxides supported on Al2O3, SiO2, TiO2 by and their modification with of 1–3 % oxides of Cu, Cr, Co, Zn enhanced the conversion of the deep oxidation process to 95–100 % at the temperatures of 673–693 K and volumetric velocities of 5000–10000 h–1. During the simultaneous oxidation of CO and C3H8 at a CO conversion of 90 %, the C3H8 conversion was 70 %. It has been established that oxidation of CO and C1–C4 hydrocarbons, and especially propane, with the participation of synthesized catalytic series, occurs by stepwise and associative mechanisms. The oxidation of CO and C3H8 required a high oxygen content of 1:20–25 mol. Besides utilizing carbon monoxide in exhaust gases from motor vehicles, these catalytic systems can be successfully used to neutralize industrial gases, especially those emitted from oil refineries and thermal power plants. Preliminary research has shown that these catalytic systems can operate for about 50 000 hours without changing the activity.