Abstract
Manganese-based bimetallic catalysts were prepared with self-made pyrolysis coke as carrier and its denitration performance of low-temperature SCR (selective catalyst reduction) was studied. The effects of different metal species, calcination temperature, calcination time and the metal load quantity on the denitration performance of the catalyst were studied by orthogonal test. The denitration mechanism of the catalyst was analyzed by XRD (X-ray diffraction), SEM (scanning electron microscope), BET test and transient test. The experiments show that: ① The denitration efficiency of Mn-based bimetallic catalysts mainly relates to the metal type, the metal load quantity and the catalyst adjuvant type. ② The optimal catalyst preparation conditions are as follows: the load quantity of monometallic MnO2 is 10%, calcined at 300°C for 4h, and then loaded with 8% CeO2, calcined at 350°Cfor 3h. ③ The denitration mechanism of manganese-based bimetallic oxide catalysts is stated as: NH3 is firstly adsorbed by B acid center Mn-OH which nears Mn4+==O to form NH4+, NH4+ was then attacked by the gas phase NO to form N2, H2O and Mn3+-OH. Finally, Mn3+-OH was oxidized by O2 to regenerate Mn4+.
Highlights
NOx is an unwanted by-product of high temperature combustion where N2 from the air combines with O2 to form oxides of nitrogen.[1]
The effects of different metal species, calcination temperature, calcination time and the metal load quantity on the denitration performance of the catalyst were studied by orthogonal test
The SCR denitration technology has realized industrialization all over the world with the advantage of higher denitration efficiency and higher utilization compared with other flue gas denitration technologies
Summary
NOx is an unwanted by-product of high temperature combustion where N2 from the air combines with O2 to form oxides of nitrogen.[1]. When we take V2O5/TiO2 as the catalyst in the flue gas SCR denitration, the operation temperature must be higher than 350◦C. It will leads the sintering of the activity sites on catalyst surface area when it was exposed to high temperatures for a long time, which results in the increasing catalyst particles and the decreasing surface area, reducing the catalyst activity.[3,4,5] Mn oxide has received great attention because of their abundant types and corresponding metal valence states, which can be converted mutually in the reaction process, contributing to the procedure of the catalytic oxidation reduction reaction. We took the manganese oxide as the main active component and Ce, Mo, or Co as the additives to prepare a Manganese-based bimetallic catalyst that can provide a theoretical basis and technical support for a better understanding of denitrifying catalysts at low temperature.[6,7,8]
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