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Enhancement of NH3-SCR performance of LDH-based MMnAl (M = Cu, Ni, Co) oxide catalyst: influence of dopant M.

ABSTRACT: Transition metal (Cu, Ni, Co) doped MnAl mixed oxide catalysts were prepared through a novel method involving the calcination of hydrotalcite precursors for the selective catalytic reduction of NO x with NH3 (NH3-SCR). The effects of transition metal modification were confirmed by means of XRD, BET, TEM, XPS, NH3-TPD, and H2-TPR measurements. Experimental results evidenced that CoMnAl-LDO presented the highest NO x removal efficiency of over 80% and a relatively high N2 selectivity of over 88% in a broad working temperature range (150-300 °C) among all the samples studied. Moreover, the CoMnAl-LDO sample possessed better stability and excellent resistance to H2O and SO2. The reasons for such results could be associated with the good dispersion of Co3O4 and MnO x , which could consequently provide optimum redox behavior, plentiful acid sites, and strong NO x adsorption ability. Furthermore, dynamics calculations verified the meaningful reduction in apparent activation energy (E a) for the CoMnAl-LDO sample, which is in agreement with the DeNO x activity.

SUBMITTER: Du Y 

PROVIDER: S-EPMC9076116 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature

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Enhancement of NH<sub>3</sub>-SCR performance of LDH-based MMnAl (M = Cu, Ni, Co) oxide catalyst: influence of dopant M.

Du Yali Y   Liu Lili L   Feng Yalin Y   Yang Baoshuan B   Wu Xu X  

RSC advances 20191202 68

Transition metal (Cu, Ni, Co) doped MnAl mixed oxide catalysts were prepared through a novel method involving the calcination of hydrotalcite precursors for the selective catalytic reduction of NO <sub><i>x</i></sub> with NH<sub>3</sub> (NH<sub>3</sub>-SCR). The effects of transition metal modification were confirmed by means of XRD, BET, TEM, XPS, NH<sub>3</sub>-TPD, and H<sub>2</sub>-TPR measurements. Experimental results evidenced that CoMnAl-LDO presented the highest NO <sub><i>x</i></sub> r  ...[more]

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