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Influence of Mg Addition on the Catalytic Activity of Alumina Supported Ag for C3H6-SCR of NO

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Abstract

The influence of different magnesium (Mg) weight percentages (1, 2.5, 5, 7.5 and 10) over silver (3 wt%) impregnated alumina (SA) catalyst was investigated for the reduction of NO by C3H6. Mg doped SA catalysts were prepared by conventional impregnation method and characterized by XRD, BET-SA, ICP-MS, XPS, SEM, UV-DRS, H2-TPR and O2-TPD. The existence of MgO and MgAl2O4 phases on Mg doped SA catalysts were observed from XRD and XPS analyses. Existence of high percentage MgAl2O4 phase on 5% Mg doped SA catalyst (Mg (5) SA) enhances the dispersion and stabilization of silver phases (Ag2O). Mg (5) SA catalyst shows a 51% of high selectivity (NO to N2) in presence of SO2 (80 ppm) at low temperatures (350 °C) and maintained high selectivity’s with a wide temperature window (350–500 °C). An optimal high surface availability of Ag0 and Ag+ species were observed from XPS analysis over Mg (5) SA catalyst. H2-TPR analysis shows high temperature reduction peak over Mg (5) SA compared to SA catalyst. XPS analysis confirms the high percent availability of MgAl2O4 species over Mg (5) SA catalyst. DRIFTS study reveals the molecular evidences for the evolution of enolic species during NO reduction over the highly active Mg (5) SA catalyst at low temperatures. It also confirms further transformation of enolic species into –NCO species with NO + O2 and finally into N2 and CO2.

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Abbreviations

Al2(SO4)3 :

Aluminum sulfate

BET-SA:

Brunauer Emmett Teller surface area

CO2 :

Carbon dioxide

DRIFTS:

Diffuse reflectance infrared Fourier transform spectroscopy

GC:

Gas chromatograph

ICP-MS:

Inductively coupled plasma mass spectrometry

–NCO:

Isocyanate

JCPDS:

Joint committee on powder diffraction spectra

MgAl2O4 :

Magnesium aluminate

Mg:

Magnesium

MgO:

Magnesium oxide

MgSO4 :

Magnesium sulfate

MCT-A:

Mercury cadmium telluride-A

NIR:

Near infrared

NOx :

Nitric oxides

NDIR:

Non dispersive infrared

PGM:

Platinum group metals

C3H6 :

Propylene

SEM:

Scanning electron microscopy

SCR:

Selective catalytic reduction

Ag2SO4 :

Silver sulfate

SO2 :

Sulfur dioxide

H2-TPR:

Temperature programmed reduction by H2

O2-TPD:

Temperature programmed desorption of O2

TCD:

Thermal conductivity detector

UV-DRS:

Ultraviolet diffuse reflectance spectroscopy

XRD:

X-ray diffraction

XPS:

X-ray photoelectron spectroscopy

SA:

3 wt% silver impregnated on alumina

Mg (1) SA:

1 wt% magnesium impregnated on 3 wt% silver alumina

Mg (2.5) SA:

2.5 wt% magnesium impregnated on 3 wt% silver alumina

Mg (5) SA:

5 wt% magnesium impregnated on 3 wt% silver alumina

Mg (7.5) SA:

7.5 wt% magnesium impregnated on 3 wt% silver alumina

Mg (10) SA:

10 wt% magnesium impregnated on 3 wt% silver alumina

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Acknowledgments

This research work was supported by a grant (07K1501-01812) from ‘Center for Nanostructured Materials Technology’ under ‘21st Century Frontier R&D Programs’ of the Ministry of Science and Technology, Korea.

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Authors and Affiliations

  1. Advanced Functional Materials Research Center, Korea Institute of Science and Technology, Cheongryang, Seoul, 130-650, Republic of Korea

    Pullur Anil Kumar, Maddigapu Pratap Reddy, Bae Hyun-Sook & Ha Heon Phil

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  1. Pullur Anil Kumar
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  2. Maddigapu Pratap Reddy
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  3. Bae Hyun-Sook
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Correspondence to Ha Heon Phil.

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Kumar, P.A., Reddy, M.P., Hyun-Sook, B. et al. Influence of Mg Addition on the Catalytic Activity of Alumina Supported Ag for C3H6-SCR of NO. Catal Lett 131, 85–97 (2009). https://doi.org/10.1007/s10562-009-9895-0

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