Introducing secondary component into magnesium oxide borne the titanium dioxide(MnOx/TiO2)

a catalyst of two-element metal oxide(MnOx-A/TiO2) has been made

here

A is Fe2O3

WO3

and Cr2O3 respectively

their low temperature catalytic activity

selectivity of N2

and SO2-resistant behavior being tested and studied.Results show that the sequence of thier low temperatureactivity is as follows:Mn-W/TiO2Mn-Fe/TiO2Mn-Cr/TiO2Mn-Mo/TiO2;the sequence in selectivity of N2 is:Mn-Fe/TiO2Mn-W/TiO2Mn-Mo/TiO2Mn-Cr/TiO2;at the time of keeping low temperature activity

Mn-Fe/TiO2 and Mn-W/TiO2 can enhance the selectivity of N2.In the case of SO2 and H2O content in the reaction gas being 0.01% and 6% respectively

after 8 h as the speed and temperature of air

becoming 12600 h-1 and 120 ℃

the conversion rate of NOx by using Mn-W/TiO2

Mn-Fe/TiO2 and Mn-Mo/TiO2 is kept at 98.5%

95.8%

and 94.2% respectively.Therefore

it is clear that the WO3 and Fe2O3 are effective catalyst aids for MnOx

they can greatly enhance the selectivity and SO2-resistant ability of MnOx/TiO2.Infrared spectrum of Fourier transfom shows that the WO3 is different from the Fe2O3

being able also to provide partial Lewis acid active points

under existence of low concentration SO2

the Mn-W/TiO2 has very good catalystic activity of low temperature NH3 selective reduction for NOx.