Abatement of nitrous oxide by ruthenium catalysts: Influence of the support

Zheng, Jian; Meyer, Simon; Köhler, Klaus

doi:10.1016/j.apcata.2015.07.019

Cited by 25 publications

(20 citation statements)

References 39 publications

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“…Several types of catalysts have been employed for energy and environmental applications, which can be generally classified into: Noble metal (NMs)-based catalysts and NMs-free metal oxides (MOs), such as bare oxides, mixed metal oxides (MMOs), perovskites, zeolites, hexaaluminates, hydrotalcites, spinels, among others. Among these, NMs-based catalysts have been traditionally used in numerous processes, such as CO oxidation [8][9][10][11], nitrous oxide (N 2 O) decomposition [12][13][14][15][16][17], water-gas shift reaction [18][19][20], carbon dioxide (CO 2 ) hydrogenation [21][22][23][24][25], etc., exhibiting high activity and selectivity. However, their scarcity and extremely high cost render mandatory the development of highly active, stable and selective catalysts that will be of low cost, nonetheless [26,27].…”

Section: Introductionmentioning

confidence: 99%

Recent Advances on the Rational Design of Non-Precious Metal Oxide Catalysts Exemplified by CuOx/CeO2 Binary System: Implications of Size, Shape and Electronic Effects on Intrinsic Reactivity and Metal-Support Interactions

Konsolakis

Lykaki

2020

Catalysts

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Catalysis is an indispensable part of our society, massively involved in numerous energy and environmental applications. Although, noble metals (NMs)-based catalysts are routinely employed in catalysis, their limited resources and high cost hinder the widespread practical application. In this regard, the development of NMs-free metal oxides (MOs) with improved catalytic activity, selectivity and durability is currently one of the main research pillars in the area of heterogeneous catalysis. The present review, involving our recent efforts in the field, aims to provide the latest advances—mainly in the last 10 years—on the rational design of MOs, i.e., the general optimization framework followed to fine-tune non-precious metal oxide sites and their surrounding environment by means of appropriate synthetic and promotional/modification routes, exemplified by CuOx/CeO2 binary system. The fine-tuning of size, shape and electronic/chemical state (e.g., through advanced synthetic routes, special pretreatment protocols, alkali promotion, chemical/structural modification by reduced graphene oxide (rGO)) can exert a profound influence not only to the reactivity of metal sites in its own right, but also to metal-support interfacial activity, offering highly active and stable materials for real-life energy and environmental applications. The main implications of size-, shape- and electronic/chemical-adjustment on the catalytic performance of CuOx/CeO2 binary system during some of the most relevant applications in heterogeneous catalysis, such as CO oxidation, N2O decomposition, preferential oxidation of CO (CO-PROX), water gas shift reaction (WGSR), and CO2 hydrogenation to value-added products, are thoroughly discussed. It is clearly revealed that the rational design and tailoring of NMs-free metal oxides can lead to extremely active composites, with comparable or even superior reactivity than that of NMs-based catalysts. The obtained conclusions could provide rationales and design principles towards the development of cost-effective, highly active NMs-free MOs, paving also the way for the decrease of noble metals content in NMs-based catalysts.

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Section: Introductionmentioning

confidence: 99%

Recent Advances on the Rational Design of Non-Precious Metal Oxide Catalysts Exemplified by CuOx/CeO2 Binary System: Implications of Size, Shape and Electronic Effects on Intrinsic Reactivity and Metal-Support Interactions

Konsolakis

Lykaki

2020

Catalysts

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“…However, it can be clearly seen that the difference in the catalytic activities was smaller and smaller with the increase in reaction temperature above 375 °C among the Ru/Al2O3-H2, Ru/Al2O3-NaBH4 and Ru/Al2O3-air catalysts, and the N2O conversions were nearly 95% over these catalysts at 425 °C. In the literature [13,27,30,31,[36][37][38][39][40], the catalytic activity of catalysts was different for N2O decomposition, as shown in Table S1. Ru/r-TiO2 exhibited better activity than our prepared catalysts; however, the Ru content in Ru/r-TiO2 was far higher than 0.5%.…”

Section: Characterization Of Prepared Samplesmentioning

confidence: 99%

“…The presence of O2 has an inhibitory effect on the N2O decomposition and decreases reaction rates over supported noble metal catalysts [32]. Zhang et al [30] reported that the sensitivity of noble metal to O2 in feed gas was dependent on the reducibility of support material. It was concluded to be Ru/SiO2 > Ru/Al2O3 > Ru/TiO2 > Ru/CeO2.…”

Section: Introductionmentioning

confidence: 99%

“…In the case of Rh catalysts [29], Rh/MgO, Rh/SiO2 with Rh sizes of 2.1-2.4 nm were more active than Rh/CeO2, Rh/Al2O3 and Rh/TiO2 with small particles of 1.0-1.4 nm for the N2O decomposition. For different supports [30], the strength of interaction between Ru and support was concluded to be MgO > TiO2 > Al2O3 = SiO2. However, catalytic activity was as follows: Ru/TiO2 > Ru/Al2O3 > Ru/SiO2 > Ru/MgO.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Ru Species on N2O Decomposition over Ru/Al2O3 Catalysts

et al. 2016

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Abstract:Ru is considered as an effective active species for N 2 O decomposition; however, there is disagreement about which ruthenium species is key for catalytic activity. In order to understand the role of Ru species in N 2 O decomposition, Ru/Al 2 O 3 (Ru/Al 2 O 3 -H 2 , Ru/Al 2 O 3 -NaBH 4 , Ru/Al 2 O 3 -air) catalysts with different ratios of metallic Ru were prepared and evaluated for their catalytic activities. Various characterizations, especially in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), were applied to investigate the relationship between activity and different Ru species. The results indicate that the N 2 O conversion displayed a linear relationship with the amount of metallic Ru. The DRIFTS results of adsorption for N 2 O show that metallic Ru was the active site. The catalytic processes are put forward based on metallic Ru species. The deactivation with increasing times used is due to the decrease in the amount of metallic Ru and agglomerates of Ru particles on the surface of catalysts.

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“…Figure a depicts the XRD pattern of obtained catalyst. The weak reflections at 2⊖=28.1°, 35.1° and 54.4° are assigned to the (110), (101) and (211) planes of crystalline RuO 2 . It might be due to the oxidation of small Ru particle in air.…”

Section: Resultsmentioning

confidence: 97%

CO₂Methanation over Supported Ru/Al₂O₃Catalysts: Mechanistic Studies byIn situInfrared Spectroscopy

et al. 2016

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Alumina supported ruthenium particles with an average diameter of 2 nm were prepared by a modified ethylene glycol reduction method. Catalytic methanation of CO2 over this catalyst was studied by in situ FTIR spectroscopy. After pretreatment in H2, different types of adsorbed species were detected on the catalyst surface at 200 °C. Based on a series of targeted experiments under variation of gas composition, order of addition, reaction time and temperature, a reaction scheme and the rate‐determining steps of CO2 methanation are proposed. Two potential reaction paths for the hydrogenation of CO2 to form CH4 were identified: (I) CO adsorbed on the Ru metal surface acted as active intermediate and the CO methanation followed. The dissociation of CO to form surface carbon represents the rate‐determining step. (II) Formyl species formed by hydrogenation of adsorbed CO2 are the active intermediate and the formation of formyl was the rate‐determining step.

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Abatement of nitrous oxide by ruthenium catalysts: Influence of the support

Cited by 25 publications

References 39 publications

Recent Advances on the Rational Design of Non-Precious Metal Oxide Catalysts Exemplified by CuOx/CeO2 Binary System: Implications of Size, Shape and Electronic Effects on Intrinsic Reactivity and Metal-Support Interactions

Recent Advances on the Rational Design of Non-Precious Metal Oxide Catalysts Exemplified by CuOx/CeO2 Binary System: Implications of Size, Shape and Electronic Effects on Intrinsic Reactivity and Metal-Support Interactions

Effect of Ru Species on N2O Decomposition over Ru/Al2O3 Catalysts

CO₂Methanation over Supported Ru/Al₂O₃Catalysts: Mechanistic Studies byIn situInfrared Spectroscopy

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Abatement of nitrous oxide by ruthenium catalysts: Influence of the support

Cited by 25 publications

References 39 publications

Recent Advances on the Rational Design of Non-Precious Metal Oxide Catalysts Exemplified by CuOx/CeO2 Binary System: Implications of Size, Shape and Electronic Effects on Intrinsic Reactivity and Metal-Support Interactions

Recent Advances on the Rational Design of Non-Precious Metal Oxide Catalysts Exemplified by CuOx/CeO2 Binary System: Implications of Size, Shape and Electronic Effects on Intrinsic Reactivity and Metal-Support Interactions

Effect of Ru Species on N2O Decomposition over Ru/Al2O3 Catalysts

CO2Methanation over Supported Ru/Al2O3Catalysts: Mechanistic Studies byIn situInfrared Spectroscopy

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CO₂Methanation over Supported Ru/Al₂O₃Catalysts: Mechanistic Studies byIn situInfrared Spectroscopy