Abstract
The see-saw effect of catalytic activity and N2 selectivity is a long-stand challenge towards industrial nitrogen-containing volatile organic compounds (NVOCs) deep degradation. Herein, a series of Ca doped LaMnO3 perovskite catalysts with varied acidity were engineered by a H3PO4 post-modification strategy, which remarkably improve the catalytic activity and N2 selectivity in n-butylamine purification. Amongst, Ca-1-P20 exhibits superior activity (T90 at 156 °C), high N2 selectivity (98 % at 200 °C), and satisfactory stability under dry/humid conditions. Surface La(PO)4 species weaken the Mn-O bonds and result in the generation of oxygen vacancy and adsorbed oxygen species, accelerating the cleavage of C-C and C-N bonds of n-butylamine and intermediates as amide and alcohols. H3PO4 post-modification-induced acidity facilitates the adsorption of n-butylamine and provides plenty of NH2* species, further promoting the internal SCR process and ultimately enhancing the N2 selectivity. Nevertheless, excessive acid sites can strongly absorb amide species and reduce the catalytic activity.
Published Version
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