|
The NO reduction by activated carbon catalyst with ammonia in this study. The reaction were progress in U-type pyrex reactor, the reaction temperature rang was 140-230℃. The sample of catalysts were prepared from a sub-bituminous coal and two bituminous coals, the catalyst with different surface characteristic were prepared by different preparation process. This study explored two objects： the reactivity of AD catalysts and the influence of the kinds of catalysis.
The reactivity of AD catalyst in this study, experiment results show that the catalyst reactivity of NO reduction is increased with the BET surface area of catalysts which prepared with the same coal precursor. Added 1% O2 into the reaction gas, the reactivity of NO reduction will enhance more than 1 times. It show that the reaction of NO reduction on activated carbon catalyst, the O2 present in the reaction gas is necessary.
In the kinetic study, for AD catalyst in absent O2, the NO conversion increase with the reaction temperature, activation energy 18 kJ/mol. The rate of NO disappear increase with the concentration of the NO and NH3. The reaction order of global kinetics of NO and NH3 is 0.52 and 0.26 respectively.
The influence of reactivity for different catalyst series, the catalyst prepared from different coal precursor, the NO conversion also increased with the BET surface area. But the ratio of reactivity increased differently with different coal precursor. For different catalyst, added 1% O2 into the reactant gas, the NO conversion enhanced profusely.
|