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Fabrication of MnOx–CeO2‑Based Catalytic Filters and Their Application in Low-Temperature Selective Catalytic Reduction of NO with NH3
journal contribution
posted on 2020-07-01, 00:13 authored by Weiman Li, Haidi Liu, Yunfa ChenCatalytic filters (CFs) were fabricated
by coating manganese and
ceria oxides on mullite filters with a high porosity and a relatively
low pressure drop and were used in the selective catalytic reduction
of NOx by NH3 (NH3-SCR). The influences of Mn/Ce ratios and loading weights were investigated.
The CF with a Mn/Ce molar ratio of 6/4 can achieve >90% NO conversion
in the temperature range of 120–250 °C, owing to abundant
surface oxygen species, Ce3+, and Mn4+ on it.
NO conversion in the temperature range of 120–250 °C increased
when the loading weight increased from 1.05 to 4.18%; however, when
the loading weight was further increased, the catalytic activity remained
unchanged. A possible growth mechanism of catalyst particles on mullite
filters was proposed: the active species tended to disperse finely
when the loading weight was lower than ∼4.00%; however, when
the loading weight was more than 4.00%, the particles tended to grow
at the conjunction of fibers, leading to a considerable pressure drop
increase. The CFs showed a dust removal ability of more than 99% in
a pilot experiment, which may provide a chance for the coprocessing
of dust and NOx in practical use.