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

DOI: 10.1016/j.catcom.2018.03.003 DOI Help

Authors: Magdalena Jablonska (RWTH Aachen University) , Bernd Wolkenar (RWTH Aachen University) , Andrew M. Beale (Research Complex at Harwell; University College London) , Stefan Pischinger (RWTH Aachen University) , Regina Palkovits (RWTH Aachen University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Catalysis Communications , VOL 110 , PAGES 5 - 9

State: Published (Approved)
Published: May 2018
Diamond Proposal Number(s): 14834

Abstract: Copper-based materials are promising catalysts in the selective catalytic oxidation of ammonia into nitrogen and water vapour (NH3-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 knowledge-based catalyst optimization. In the present work, Cu-Mg-Al-Ox mixed metal oxides and Cu/Al2O3 active catalysts in NH3-SCO were investigated under NH3/O2/CO2/H2O/N2 reaction conditions. Powder XRD, BET, NH3-TPD, H2-TPR and XAFS methods were used to characterize Cu-Mg-Al-Ox (Cu/Mg/Al = 8/63/29, mol%) and 10 wt% Cu/Al2O3. Cu-Mg-Al-Ox hydrotalcite derived mixed metal oxides were obtained by coprecipitation, while Cu/Al2O3 was prepared by incipient wetness impregnation. A highly dispersed copper oxide species formed on Cu-Mg-Al-Ox, while a mixture of highly dispersed (CuOx) and bulk copper oxide species (CuO and CuAl2O4) formed on Cu/Al2O3. The comparison of Cu-Mg-Al-Ox and Cu/Al2O3 in NH3-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 NH3/O2/N2 and NH3/O2/CO2/H2O/N2 reaction conditions, respectively.

Journal Keywords: Copper; Alumina; Mixed metal oxides; Large-scale NH3-SCO

Subject Areas: Chemistry, Materials

Instruments: B18-Core EXAFS

Added On: 13/03/2018 09:40

Discipline Tags:

Physical Chemistry Catalysis Chemistry Materials Science

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS)