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The catalyst of Fe-Mo/ZSM-5 has been found to be more active than Fe-ZSM-5 and Mo/ZSM-5 separately for selective catalytic reduction (SCR) of nitric oxide (NO) with NH_3.The kinetics of the SCR reaction in the presence of O_2 was studied in this work.The results showed that the observed reaction orders were 0.74-0.99,0.01-0.13,and 0 for NO,O_2 and NH_3 at 350-450℃,respectively. And the apparent activation energy of the SCR was 65 kJ/mol on the Fe-Mo/ZSM-5 catalyst.The SCR mechanism was also deduced. Adsorbed NO species can react directly with adsorbed ammonia species on the active sites to form N_2 and H_2O.Gaseous O_2 might serve as a reoxidizing agent for the active sites that have undergone reduction in the SCR process.It is also important to note that a certain amount of NO was decomposed directly over the Fe-Mo/ZSM-5 catalyst in the absence of NH_3.
The catalyst of Fe-Mo / ZSM-5 has been found to be more active than Fe-ZSM-5 and Mo / ZSM-5 for selective catalytic reduction (SCR) of nitric oxide SCR reaction in the presence of O_2 was studied in this work. The results showed that the observed reaction orders were 0.74-0.99,0.01-0.13, and 0 for NO, O_2 and NH_3 at 350-450 ° C, respectively. And the apparent activation energy of the SCR was 65 kJ / mol on the Fe-Mo / ZSM-5 catalyst. The SCR mechanism was also deduced. Adsorbed NO species can react directly with the adsorbed ammonia species on the active sites to form N_2 and H_2O. Gaseous O_2 might serve as a reoxidizing agent for the active sites that have undergone reduction in the SCR process. It is also important to note that a certain amount of NO was decomposed directly over the Fe-Mo / ZSM-5 catalyst in the absence of NH_3.