Issue 109, 2016, Issue in Progress

Low-temperature selective catalytic reduction of NO with NH3 over Ni–Mn–Ox catalysts

Abstract

A series of manganese–nickel oxide catalysts with different Ni/Mn ratios were prepared using a hard template method with KIT-6 as the template. These mesoporous nanomaterials were characterized using Brunauer–Emmett–Teller (BET), X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy and X-ray photoelectron spectroscopy (XPS). The low temperature selective catalytic reduction (SCR) of NO with NH3 in the presence of excess O2 was investigated. At a gas hourly space velocity (GHSV) of 38 000 h−1, the Ni(1 : 3)–MnOx (Ni/Mn = 1 : 3) catalyst had the highest activity, giving an NO conversion of 81.3% at 60 °C and 100% from 100 to 220 °C. The Ni(1 : 3)–MnOx catalyst had high N2 selectivity, excellent stability, good H2O resistance and functioned well at various GHSVs. The BET, XRD and XPS results showed that the Ni(1 : 3)–MnOx catalysts had large surface areas (187 m2 g−1) and that a more amorphous phase was formed as the nickel content was increased. The Mn4+ and chemisorbed oxygen are the main active species for the SCR reaction. These properties are desirable for low-temperature SCR catalysts.

Graphical abstract: Low-temperature selective catalytic reduction of NO with NH3 over Ni–Mn–Ox catalysts

Article information

Article type
Paper
Submitted
24 Aug 2016
Accepted
01 Nov 2016
First published
02 Nov 2016

RSC Adv., 2016,6, 107270-107277

Low-temperature selective catalytic reduction of NO with NH3 over Ni–Mn–Ox catalysts

P. Zhang, Y. Sun, W. Su, Y. Wei and J. Liu, RSC Adv., 2016, 6, 107270 DOI: 10.1039/C6RA21267K

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