Catalytic decomposition of N<sub>2</sub>O over Cu–Al–O<sub>x</sub> mixed metal oxides

Jabłońska, Magdalena; Agote-Arán, Miren; Beale, Andrew M.; Góra‐Marek, Kinga; Delahay, Gérard; Petitto, Carolina; Pacultová, Kateřina; Palkovits, Regina

doi:10.1039/c8ra10509j

Cited by 20 publications

(7 citation statements)

References 26 publications

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“…Influence of Nd addition on the reducibility of the materials can be visualized by the change of the shape of H 2 ‐TPR profiles and H 2 consumption. Cu 0.8 Al 0.2 showed a broad peak in range from 200–400 °C, associated to the reduction of copper oxide to metallic copper . In fact, its hydrogen consumption was 10.3 mmol g −1 , almost the same as expected amount (Table ).…”

Section: Resultssupporting

confidence: 64%

Effect of Neodymium on the Physico‐chemical Properties and N₂O Decomposition Activity of Co(Cu)−Al Mixed Oxides

Jabłońska

Nocuń

et al. 2019

ChemCatChem

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Cu−Al and Co−Al (M/Al=0.8/0.2, molar ratio; M=Cu or Co) mixed metal oxides showed a moderate activity in N2O decomposition (deN2O) with full conversion at about 500–550 °C. Addition of Nd modified the physico‐chemical and catalytic properties of both Cu−Al and Co−Al materials, though an optimal Nd loading was required. The addition of Nd in Cu0.8Al0.2 and Co0.8Al0.2 with Nd/Co(Cu)/Al = 0.5/0.8/0.2 molar ratio, improved significantly their catalytic activity. In particular, the temperatures needed for full N2O conversion were 100 °C lower than those of the bare materials. Furthermore, the most active Nd0.5Co0.8Al0.2 catalyst exhibited a stable 60 % N2O conversion at 450 °C for 50 h in presence of NO (200 ppm), O2 (20,000 ppm) and H2O (2500 ppm). The enhancement in the activity of both Cu‐ and Co‐containing materials was related to the formation of CuNd2O4 for Nd0.5Cu0.8Al0.2 and NdCoO3 for Nd0.5Co0.8Al0.2. The presence of CuNd2O4 or NdCoO3 accounted for changes in redox properties, e. g., easier reduction or faster release of oxygen, and in turn an increased catalyst activity in deN2O. The investigation of rare earth‐based catalysts for deN2O is limited in the scientific literature, while a comprehensive understanding of the involved active species may facilitate a knowledge‐based catalyst optimization.

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Section: Resultssupporting

confidence: 64%

Effect of Neodymium on the Physico‐chemical Properties and N₂O Decomposition Activity of Co(Cu)−Al Mixed Oxides

Jabłońska

Nocuń

et al. 2019

ChemCatChem

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“…The hydrogen consumption of both CuAl and CuO started around 130°C but the reduction of copper oxide to metallic copper was completed at 350°C on CuO and 400°C on CuAl, despite the lower amount of CuO present in the latter sample (Fig. 4A) [47]. This effect is similar to the delayed reduction of CuO when deposited in a limited amount on c-Al 2 O 3 support, the lower reducibility being attributed to strong oxide-support interaction [48].…”

Section: H 2 -Tpr Of Catalysts and Benchmark Materialsmentioning

confidence: 82%

Promotion effect of rare earth elements (Ce, Nd, Pr) on physicochemical properties of M-Al mixed oxides (M = Cu, Ni, Co) and their catalytic activity in N2O decomposition

Jabłońska

Beltrami

et al. 2021

J Mater Sci

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A series of M-AlOx mixed oxides (M = Cu, Co, Ni) with the addition of high loadings of rare earth elements (REE, R = Ce, Nd, Pr; R0.5M0.8Al0.2, molar ratio) were investigated in N2O decomposition. The precursors were prepared by coprecipitation and subsequent calcination at 600 °C. The obtained mixed metal oxides were characterized by X-ray diffraction with Rietveld analysis, N2 sorption, and H2 temperature-programmed reduction. Depending on the nature of REE and the initial M-Al system, R cations could be separately segregated in oxide form or coordinated with the transition metal cations and form mixed structures. The addition of Ce3+ consistently led to nanocrystalline CeO2 mixed with the divalent oxides, whereas the addition of Nd3+ or Pr3+ resulted in the formation of their respective oxide phases as well as perovskites/Ruddlesden–Popper phases. The presence of REE modified the textural and redox properties of the calcined materials. The rare earth element-induced formation of low-temperature reducible MOx species that systematically improved the N2O decomposition on the modified catalysts compared to the pristine M-Al materials by the order of Co > Ni > Cu. The Ce0.5Co0.8Al0.2 catalyst revealed the highest activity and remained stable (approximately 90% of N2O conversion) for 50 h during time-on-stream in 1000 ppm N2O, 200 ppm NO, 20 000 ppm O2, 2500 ppm H2O/N2 balance at WHSV = 16 L g−1 h−1.

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“…30,31 Because of the potentially harmful effects of nitrous oxide on the global environment, urgent control and reduction of the emission has been required. Its catalytic decomposition into nitrogen and oxygen is considered the most effective and economic one, and various supported [32][33][34][35][36] and mixed oxide [37][38][39][40][41] catalysts have been developed. We previously indicated that copper supported silica-alumina hollow sphere particles were highly active for the decomposition reaction.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of copper supported porous silica–alumina hollow spheres for catalytic decomposition of nitrous oxide

et al. 2022

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Catalytic decomposition of N₂O over Cu–Al–O_x mixed metal oxides

Abstract: Cu–Al–Ox mixed metal oxides with intended molar ratios of Cu/Al = 85/15, 78/22, 75/25, 60/30, were prepared by thermal decomposition of precursors at 600 °C and tested for the decomposition of nitrous oxide (deN2O).

Cited by 20 publications

References 26 publications

Effect of Neodymium on the Physico‐chemical Properties and N₂O Decomposition Activity of Co(Cu)−Al Mixed Oxides

Effect of Neodymium on the Physico‐chemical Properties and N₂O Decomposition Activity of Co(Cu)−Al Mixed Oxides

Promotion effect of rare earth elements (Ce, Nd, Pr) on physicochemical properties of M-Al mixed oxides (M = Cu, Ni, Co) and their catalytic activity in N2O decomposition

Fabrication of copper supported porous silica–alumina hollow spheres for catalytic decomposition of nitrous oxide

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Catalytic decomposition of N2O over Cu–Al–Ox mixed metal oxides

Abstract: Cu–Al–Ox mixed metal oxides with intended molar ratios of Cu/Al = 85/15, 78/22, 75/25, 60/30, were prepared by thermal decomposition of precursors at 600 °C and tested for the decomposition of nitrous oxide (deN2O).

Cited by 20 publications

References 26 publications

Effect of Neodymium on the Physico‐chemical Properties and N2O Decomposition Activity of Co(Cu)−Al Mixed Oxides

Effect of Neodymium on the Physico‐chemical Properties and N2O Decomposition Activity of Co(Cu)−Al Mixed Oxides

Promotion effect of rare earth elements (Ce, Nd, Pr) on physicochemical properties of M-Al mixed oxides (M = Cu, Ni, Co) and their catalytic activity in N2O decomposition

Fabrication of copper supported porous silica–alumina hollow spheres for catalytic decomposition of nitrous oxide

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Catalytic decomposition of N₂O over Cu–Al–O_x mixed metal oxides

Effect of Neodymium on the Physico‐chemical Properties and N₂O Decomposition Activity of Co(Cu)−Al Mixed Oxides

Effect of Neodymium on the Physico‐chemical Properties and N₂O Decomposition Activity of Co(Cu)−Al Mixed Oxides