Effects on the Combustion Characteristics and Denitrification of Modified TiO2 in the Combustion with Biomass and Coal

Abstract

The V/Mn modified TiO2 samples were prepared by sol-gel method assisted by microwave. At the same time, the denitrification experiments were carried out in the tube furnace and the combustion characteristics of the samples were analyzed by thermogravimetric analyzer. The results showed that the denitrification efficiency of V-Mn-TiO2 was 10% and 15% higher than that of V-TiO2 and Mn-TiO2 respectively. The calcination temperature of the catalyst prepared by microwave assisted sol-gel process was 100°C lower than that of using sol-gel method but the two catalysts have the same efficiency. The BET analysis showed that the modified TiO2 can reduce the emission of NOX because of the larger specific surface area, adsorption and the pore volume. V-Mn-TiO2 could make effects such as reducing apparent activation energy in combustion, and it had a great influence on the early stage of coal burning. Without CaO, V-Mn-TiO2 made the ignition lowered than 33.2°C; mixed with CaO, V-Mn-TiO2 made the ignition lowered than 39.9°C. Thus the coal and biomass co-combustion were suitable for the first-order kinetic model. The results showed that modified TiO2 can help to make the fault coal available and reduce the emissions of NOX to achieve ultra-low emission standard.