A strategy for constructing highly efficient Co3O4-C@SiO2 nanofibers
catalytic membrane for NOx-SCR and dust removal
Abstract
The strategy of constructing catalytic membrane has a significant
influence on its structure and performance. In this work, Co3O4-Cx@SiO2
nanofiber membranes (NFMs) were fabricated by an in-situ
growth–pyrolysis–oxidation strategy. The Co3O4-Cx catalyst derived
from ZIF-67 was wrapped around nanofibers, which helps to maintain a
stable membrane structure, then suppressing the reduction of gas
permeability. Among the Co3O4-Cx catalyst, the carbon skeleton can
prevent the agglomeration of Co3O4 nanoparticles, obtaining an
ultra-fine Co3O4 nanoparticles with high dispersibility, redox property
and surface area. The obtained Co3O4-C300@SiO2 NFM exhibits excellent
filtration efficiency and low pressure drop for PM2.5 (99.99% and 55
Pa) and outstanding catalytic performance with T90 of 245 °C for
NH3-SCR, which is 40.3% higher than that of Co3O4@SiO2 NFM. This work
might provide a universal strategy for the preparation of catalytic
membrane with high-performance.