Abstract：In the paper, the NRC and PRC columnar denitration catalysts were prepared using aluminum sol binders (nano-alumina and pseudo-boehmite) through the extrusion molding method. Their denitration performance was studied. It was shown that, compared to the original tailings, the denitration activity of the columnar catalysts was significantly improved. Compared to PRC, the denitration efficiency of NRC was found to be higher, reaching 67%. With the increase in the addition of the two binders, the mechanical strength was found to be improved to a certain extent. A more uniform surface distribution was observed in PRC, which allowed the catalyst to have a larger specific surface area and more surface acid sites. It was shown by H2-TPR experiments that the area of the reduction peaks of PRC was decreased, the number of reduction peaks was reduced, and the redox ability was weakened, which was identified as the reason for its relatively smaller improvement in denitration performance. Both the E-R mechanism and L-H mechanism were observed on the surfaces of rare earth tailings and NRC, and the E-R mechanism of NRC was found to play a stronger role.
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