Copper-based materials are promising catalysts in the selective catalytic oxidation of ammonia into nitrogen and water vapour (NH 3 -SCO). Investigations under applied reaction conditions over such materials seem to be rare and a comprehensive understanding of the involved active copper oxide species could facilitate a knowledgebased catalyst optimization. In the present work, Cu-Mg-Al-O x mixed metal oxides and Cu/Al 2 O 3 active catalysts in NH 3 -SCO were investigated under NH 3 /O 2 /CO 2 /H 2 O/N 2 reaction conditions. Powder XRD, BET, NH 3 -TPD, H 2 -TPR and XAFS methods were used to characterize Cu-Mg-Al-O x (Cu/Mg/Al = 8/63/29, mol%) and 10 wt% Cu/Al 2 O 3 . Cu-Mg-Al-O x hydrotalcite derived mixed metal oxides were obtained by coprecipitation, while Cu/ Al 2 O 3 was prepared by incipient wetness impregnation. A highly dispersed copper oxide species formed on Cu-Mg-Al-O x , while a mixture of highly dispersed (CuO x ) and bulk copper oxide species (CuO and CuAl 2 O 4 ) formed on Cu/Al 2 O 3 . The comparison of Cu-Mg-Al-O x and Cu/Al 2 O 3 in NH 3 -SCO provided good insight into the nature of the active species present in both copper-based catalysts. It was found that highly dispersed easily reducible copper oxide species and bulk copper oxide species appear as active species under NH 3 /O 2 /N 2 and NH 3 /O 2 / CO 2 /H 2 O/N 2 reaction conditions, respectively.

Magdalena Jabłońska

Bernd Wolkenar

Andrew M. Beale

Stefan Pischinger

Regina Palkovits

Catalysis Communications

CATALYSIS COMMUNICATIONS 旨在快速发表重要、新颖和及时的均相、非均相和酶催化研究成果。

Catalysis Communications aims to rapidly publish significant, novel, and timely research findings in homogeneous, heterogeneous, and enzymatic catalysis.

《Catalysis Communications》旨在快速发表重要、新颖和及时的均相、非均相及酶催化研究成果。

Category	Quartile
化学	3
化学, 物理化学	3

Comparison of Cu-Mg-Al-Ox and Cu/Al2O3 in selective catalytic oxidation of ammonia (NH3-SCO)

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Journal Info

Category	Quartile
CHEMISTRY, PHYSICAL	2