Ethyl Acetate Abatement on Copper Catalysts Supported on Ceria Doped with Rare Earth Oxides

Carabineiro, Sónia A.C.; Konsolakis, Michalis; Marnellos, George; Asad, M.F.; Soares, O.S.G.P.; Tavares, Pedro B.; Pereira, M.F.R.; Órfão, J.J.M.; Figueiredo, José L.

doi:10.3390/molecules21050644

Cited by 32 publications

(19 citation statements)

References 86 publications

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“…X-ray Photoelectron-Spectroscopy Analysis of Catalysts XPS analysis was conducted to assess the impact of doping on elemental valence. Figure 5a shows the Ce 3d XPS spectra of cat-K/ZC, cat-CZ, and cat-ZC, which demonstrate the presence of eight components, as reported in several relevant studies [34][35][36][37][38][39][40][41]. The Ce 3d spectrum consists of two series of spin-orbit lines u and v. Figure 5a displays that Ce 3d 3/2 spin-obit components of cat-ZC which correspond to u lines include three characteristic peaks labeled as u (901.7 eV), u" (908.9 eV), and u Catalysts 2019, 9, x FOR PEER REVIEW phases coexist with CexZr1−xO2 solid solution, the ignition temperature o catalytic performance of the catalyst gets improved as presented in Figure 4a K/ZC exhibited an excellent effect and the ignition temperature was 351 C oxidation of soot was promoted by increasing the catalyst contact with the hi [15][16][17][18][19].…”

Section: Samples or Sootsupporting

confidence: 62%

“…2.1.5. X-ray Photoelectron-Spectroscopy Analysis of Catalysts XPS analysis was conducted to assess the impact of doping on elem shows the Ce 3d XPS spectra of cat-K/ZC, cat-CZ, and cat-ZC, which dem eight components, as reported in several relevant studies [34][35][36][37][38][39][40][41]. The Ce 3d series of spin-orbit lines u and v. Figure 5a displays that Ce 3d3/2 spin-ob which correspond to u lines include three characteristic peaks labeled as u and u‴ (917.0 eV).…”

Section: Samples or Sootmentioning

confidence: 99%

“…In summary, Ce-Zr solid solutions show good cat performance for soot combustion, and the Co/CZ (Co3O4/CZ) sample exhibits the best cat performance. [34][35][36][37][38][39][40][41]. The Ce 3d spectrum consists o series of spin-orbit lines u and v. Figure 5a displays that Ce 3d3/2 spin-obit components of c which correspond to u lines include three characteristic peaks labeled as u (901.7 eV), u" (908.9 and u‴ (917.0 eV).…”

Section: Samples or Sootmentioning

confidence: 99%

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Catalytic Combustion of Diesel Soot on Ce/Zr Series Catalysts Prepared by Sol-Gel Method

Zhang

Wang

et al. 2019

Catalysts

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Cerium-zirconium (Ce-Zr) solid solutions have been extensively used in a wide variety of catalytic processes due to their unique catalytic features in conjunction with lower cost compared to noble metal-based systems. A series of Ce-Zr-based catalysts was prepared by the sol-gel method. The structure and morphology of these catalysts were characterized by X-ray diffraction, thermogravimetric-differential scanning calorimetry, scanning electron microscopy, energy dispersive spectroscopy, and X-ray photoelectron spectroscopy. Furthermore, investigation on catalytic performance was carried out by constructing a test platform, and the result indicated that the catalysts apparently decreased the soot ignition temperature. These catalysts exhibited higher catalytic activity for soot oxidation under narrow contact conditions. The results revealed that some soot particles could react with adsorbed oxygen, and other part of diesel soot reacted with lattice oxygen. The activity of these catalysts was attributed to synergistic effect arising from the combination of K/Co/Zr and Ce-Zr solid solution, which led to the decrease in the ignition temperature to 294 • C (data from the test platform). The catalyst still keeps good stability and catalytic activity after the cycle oxidation experiment. A reaction pathway was proposed to explain catalytic combustion process of soot, i.e., combination of K/Co/Zr with Ce-Zr solid solution reduced the binding energy of Ce-Zr solid solution, which was conducive to provide more active sites to release the active oxygen (O 2 − ) or lattice oxygen (O 2− ).Catalysts 2019, 9, 646 2 of 18 the filter becomes necessary. Soot burns at 500-600 • C under air conditions, while the diesel exhaust temperature is only 200-400 • C. Therefore, igniting soot combustion under these conditions requires catalytic oxidation. The filter should be able to trap and burn soot particles when it collects them, so that the filter does not saturate. A large number of catalysts has been investigated for controlling the exhaust emissions of diesel engines, and the main objective of most of these studies is to improve the catalytic performance for soot combustion. Numerous articles reporting the use of CeO 2 as an effective catalyst for soot combustion are available [11,12], and a mechanism has been proposed to explain these catalytic processes. The Ce 4+ /Ce 3+ redox cycle confers the ability to absorb gaseous O 2 , thus forming active oxygen at the catalyst surface (O ads ), which can be transferred to the soot catalyst interface by superficial diffusion. For this reason, properties of the Ce 4+ /Ce 3+ couple and the capacity of CeO 2 to exchange oxygen with the gas phase make CeO 2 -based materials one of the most promising catalysts for soot combustion [13,14]. They are widely known to favor the oxidation of soot by increasing the catalyst/soot contact with the high mobility of alkali metals or alkaline-earth metals [15][16][17][18][19][20]. Fan et al. studied the effect of Ba loading on Cu-Ce catalysts, and it was sh...

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Section: Samples or Sootsupporting

confidence: 62%

Section: Samples or Sootmentioning

confidence: 99%

Section: Samples or Sootmentioning

confidence: 99%

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Catalytic Combustion of Diesel Soot on Ce/Zr Series Catalysts Prepared by Sol-Gel Method

Zhang

Wang

et al. 2019

Catalysts

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“…On the other hand, metal oxides (MOs) prepared from earth-abundant, and inexpensive transition metals have attracted considerable attention as alternatives to rare and expensive NMs, due to their particular features, such as enhanced redox properties, thermal stability and catalytic performance in conjunction to their lower cost [2,3,5,[28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43]. The latter is clearly manifested in Figure 1, which schematically depicts the cost of noble metals in comparison with copper (a typical transition metal massively involved in MOs) for the past five-year period.…”

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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“…Copper is also used as a catalyst, deposited on different lanthanide-doped cerium oxides (Ce 0.5 Ln 0.5 O 1.75 , where Ln: Gd, La, Pr, Nd) for the oxidation of ethyl acetate, a harmful volatile organic compound [4]. The best catalytic performance was obtained for Cu/CeO 2 and Cu/Ce 0.5 Pr 0.5 O 1.75 samples.…”

Section: Introductionmentioning

confidence: 99%

Special Issue: Coinage Metal (Copper, Silver, and Gold) Catalysis

Carabineiro

2016

Molecules

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Abstract:The subject of catalysis by coinage metals (copper, silver, and gold) comes up increasingly day-by-day. This Special Issue aims to cover the numerous aspects of the use of these metals as catalysts for several reactions. It deals with synthesis and characterization of copper, silver and gold based catalysis, their characterization and use, both for heterogeneous and homogeneous catalysis, and some of their potential applications.Keywords: copper; silver; gold; catalysis; selectivity Catalysts are materials that allow important reactions to be more selective, faster and require less energy. Coinage metals (copper, silver, and gold) are often found as important components of most catalysts and are known for their high activity and important properties. Thus the demand for research on this topic is continuously increasing.This Special Issue aims to cover several aspects of the usage of Cu, Ag and Au as catalysts for both homogenous and heterogeneous catalysis. It consists of nine important "cutting-edge" open access papers available to all online.The role of sub-nanometric Ag species (on Fe, Mg and Ce modified TiO 2 materials) on catalytic CO oxidation is studied by several techniques in [1]. The observed phenomena cannot be explained only considering the 1-13 nm Ag particle size distributions measured by HRTEM; the existence of Ag species with size < 1 nm, non-visible in HRTEM, and their interaction with the supports, needs also to be taken into account.Silver and copper are reported as catalysts, in a new and efficient way, for the cycloaddition of propargyl-substituted dihydroisoindolin-1-one with arylnitrile oxides to produce novel 3,5-disubstituted isoxazoles of the ethyl-2-benzyl-3-oxo-1-((3-arylisoxazol-5yl)methyl)-2,3-dihydro-1H-isoindole-1-carboxylate type [2]. Yields are significantly improved with the presence of Cu I as catalyst compared to the uncatalyzed reaction, without changing the selectivity.Aroylhydrazone Cu(II) complexes in keto form are reported as catalysts for the peroxidative oxidation of cyclohexane to cyclohexyl hydroperoxide, cyclohexanol and cyclohexanone, under mild conditions [3]. The activity exhibited by those complexes in the absence of any additive, is higher than that shown by other efficient Cu II systems reported in the literature.Copper is also used as a catalyst, deposited on different lanthanide-doped cerium oxides (Ce 0.5 Ln 0.5 O 1.75 , where Ln: Gd, La, Pr, Nd) for the oxidation of ethyl acetate, a harmful volatile organic compound [4]. The best catalytic performance was obtained for Cu/CeO 2 and Cu/Ce 0.5 Pr 0.5 O 1.75 samples. A strong correlation was found between the catalytic performance and the redox properties of the samples, in terms of reducibility and lattice oxygen availability.Gold incorporated on a mesoporous silica thin film is reported as a robust surface enhanced Raman scattering (SERS) and catalytically active substrate for the reduction of p-nitrophenol to p-aminophenol [6]. This material might offer a promising eco-friendly way for the product...

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Ethyl Acetate Abatement on Copper Catalysts Supported on Ceria Doped with Rare Earth Oxides

Cited by 32 publications

References 86 publications

Catalytic Combustion of Diesel Soot on Ce/Zr Series Catalysts Prepared by Sol-Gel Method

Catalytic Combustion of Diesel Soot on Ce/Zr Series Catalysts Prepared by Sol-Gel Method

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

Special Issue: Coinage Metal (Copper, Silver, and Gold) Catalysis

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