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Comparison of Cu-Mg-Al-Ox and Cu/Al2O3 in selective catalytic oxidation of ammonia (NH3-SCO)
Catalysis Communications ( IF 3.4 ) Pub Date : 2018-03-05 , DOI: 10.1016/j.catcom.2018.03.003
Magdalena Jabłońska , Bernd Wolkenar , Andrew M. Beale , Stefan Pischinger , Regina Palkovits

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.



中文翻译:

Cu-Mg-Al-O x和Cu / Al 2 O 3在氨(NH 3 -SCO)选择性催化氧化中的比较

铜基材料是将氨选择性催化氧化为氮气和水蒸气(NH 3 -SCO)的有前途的催化剂。在这种材料的应用反应条件下进行的研究似乎很少,对所涉及的活性氧化铜物质的全面理解可以促进基于知识的催化剂优化。在目前的工作中,在NH 3 / O 2 / CO 2 / H 2 O / N 2反应条件下,研究了NH 3 -SCO中的Cu-Mg-Al-O x混合金属氧化物和Cu / Al 2 O 3活性催化剂。。粉末XRD,BET,NH 3 -TPD,H 2-TPR和XAFS方法用于表征Cu-Mg-Al-O x(Cu / Mg / Al = 8/63/29,mol%)和10wt%的Cu / Al 2 O 3。通过共沉淀获得Cu-Mg-Al-O x水滑石衍生的混合金属氧化物,而通过初期湿润浸渍制备Cu / Al 2 O 3。在Cu-Mg-Al-O x上形成了高度分散的氧化铜物质,而在Cu / Al 2 O 3上形成了高度分散的(CuO x)和块状氧化铜物质(CuO和CuAl 2 O 4)的混合物。Cu-Mg-Al-O x和Cu / Al 2 O的比较3在NH 3 - SCO提供了良好的洞察存在于铜基催化剂的活性物种的性质。发现在NH 3 / O 2 / N 2和NH 3 / O 2 / CO 2 / H 2 O / N 2反应条件下,高度分散的易还原的氧化铜物种和块状氧化铜物种分别作为活性物种出现。

更新日期:2018-03-05
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