Heterostructured Copper–Ceria and Iron–Ceria Nanorods: Role of Morphology, Redox, and Acid Properties in Catalytic Diesel Soot Combustion

Sudarsanam, Putla; Hillary, Brendan; Amin, Mohamad Hassan; Rockstroh, Nils; Bentrup, Ursula; Brückner, Angelika; Bhargava, Suresh K.

doi:10.1021/acs.langmuir.7b03998

Cited by 77 publications

(71 citation statements)

References 58 publications

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“…There are two very small peaks at 2θ values ~35.96 and 54.26° in Fe2O3/CeO2 samples which correspond to the hematite (Fe2O3) phase (JCPDS card 33-0664) [40,52]. However, the peak at 2θ 41.03° present in the Fe2O3-D sample, which is attributed to the hematite phase [40], is not observed in the mixed oxides. The peaks are characteristic of the cerianite and hematite phases in accordance with the nominal composition of the mixed oxides (Table 1).…”

Section: Textural and Structural Characteristics (Bet/xrd)mentioning

confidence: 95%

“…In this regard, it is of great importance to develop cost-effective and highly efficient catalysts based on iron oxide (Fe 2 O 3 ), which is considered to be one of the cheapest metal oxides [30]. Among the various catalytic systems, iron-ceria mixed oxides have been studied in several catalytic reactions, such as oxidation processes [30][31][32][33][34], reduction processes [35,36], decomposition reactions [37,38], soot combustion [39,40], etc.…”

Section: Of 21mentioning

confidence: 99%

“…Furthermore, the support role on the decomposition of sulfuric acid has been studied through the development of a series of supported iron oxide-based catalysts [37]. Also, Sudarsanam et al [40] studied the role of support morphology in copper-ceria and iron-ceria nanorods for diesel soot combustion, and revealed an abundance in oxygen vacancies in both catalytic systems, with copper-ceria nanorods, however, exhibiting the best catalytic performance, which was ascribed to the high reducibility of ceria and the large amount of acid sites.…”

Section: Of 21mentioning

confidence: 99%

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Facet-Dependent Reactivity of Fe2O3/CeO2 Nanocomposites: Effect of Ceria Morphology on CO Oxidation

et al. 2019

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Ceria has been widely studied either as catalyst itself or support of various active phases in many catalytic reactions, due to its unique redox and surface properties in conjunction to its lower cost, compared to noble metal-based catalytic systems. The rational design of catalytic materials, through appropriate tailoring of the particles’ shape and size, in order to acquire highly efficient nanocatalysts, is of major significance. Iron is considered to be one of the cheapest transition metals while its interaction with ceria support and their shape-dependent catalytic activity has not been fully investigated. In this work, we report on ceria nanostructures morphological effects (cubes, polyhedra, rods) on the textural, structural, surface, redox properties and, consequently, on the CO oxidation performance of the iron-ceria mixed oxides (Fe2O3/CeO2). A full characterization study involving N2 adsorption at –196 °C, X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), temperature programmed reduction (TPR), and X-ray photoelectron spectroscopy (XPS) was performed. The results clearly revealed the key role of support morphology on the physicochemical properties and the catalytic behavior of the iron-ceria binary system, with the rod-shaped sample exhibiting the highest catalytic performance, both in terms of conversion and specific activity, due to its improved reducibility and oxygen mobility, along with its abundance in Fe2+ species.

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Section: Textural and Structural Characteristics (Bet/xrd)mentioning

confidence: 95%

Section: Of 21mentioning

confidence: 99%

Section: Of 21mentioning

confidence: 99%

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Facet-Dependent Reactivity of Fe2O3/CeO2 Nanocomposites: Effect of Ceria Morphology on CO Oxidation

et al. 2019

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“…However, not all methods lead to particles of well-ordered size and shape with uniform dispersion on the catalyst surface [145]. Among the different methods, the hydrothermal one has attracted considerable attention, due to the simplicity of the precursor compounds used, the short reaction time, the homogeneity in morphology, as well as the acquisition of various nanostructures, such as rods, polyhedra, cubes, wires [107,117,121,124,131,134,135,[146][147][148][149][150][151][152][153][154][155][156][157][158][159]. Ceria nanocrystals have three low-index lattice facets of different activity and stability, namely, {100}, {110}, {111} [48,106], as shown in Figure 6.…”

Section: Shape Effectsmentioning

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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“…Focusing on the purification of SOF, CeO 2 -based oxygen storage materials (OSM) have been greatly impressed by considerable researchers due to the superior catalytic activity on hydrocarbons and SOF oxidation [16][17][18]. Meanwhile, controlled synthesized of nanostructured CeO 2 -based catalysts and their catalytic performance in diesel soot oxidation are lucubrated [19,20]. However, CeO 2 -based catalysts are easily poisoned by SO 2 [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Sulfur-Resistant TiO2-CeO2 Composite and Its Catalytic Performance in the Oxidation of a Soluble Organic Fraction from Diesel Exhaust

et al. 2018

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Sulfur poisoning is one of the most important factors deteriorating the purification efficiency of diesel exhaust after-treatment system, thus improving the sulfur resistibility of catalysts is imperative. Herein, ceria oxygen storage material was introduced into a sulfur-resistant titania by a co-precipitation method, and the sulfur resistibility and catalytic activity of prepared TiO 2 -CeO 2 composite in the oxidation of diesel soluble organic fraction (SOF) were studied. Catalytic performance testing results show that the CeO 2 modification significantly improves the catalytic SOF purification efficiency of TiO 2 -CeO 2 catalyst. SO 2 uptake and energy-dispersive X-ray (EDX) results suggest that the ceria doping does not debase the excellent sulfur resistibility of bare TiO 2 , the prepared TiO 2 -CeO 2 catalyst exhibits obviously better sulfur resistibility than the CeO 2 and commercial CeO 2 -ZrO 2 -Al 2 O 3 . X-ray powder diffraction (XRD) and Raman spectra indicate that cerium ions can enter into the TiO 2 lattice and not form complete CeO 2 crystals. X-ray photoelectron spectroscopy (XPS), H 2 -temperature programmed reduction (H 2 -TPR) and oxygen storage capacity (OSC) testing results imply that the addition of CeO 2 in TiO 2 -CeO 2 catalyst can significantly enhance the surface oxygen concentration and oxygen storage capacity of TiO 2 -CeO 2 .

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Heterostructured Copper–Ceria and Iron–Ceria Nanorods: Role of Morphology, Redox, and Acid Properties in Catalytic Diesel Soot Combustion

Cited by 77 publications

References 58 publications

Facet-Dependent Reactivity of Fe2O3/CeO2 Nanocomposites: Effect of Ceria Morphology on CO Oxidation

Facet-Dependent Reactivity of Fe2O3/CeO2 Nanocomposites: Effect of Ceria Morphology on CO Oxidation

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

Synthesis of Sulfur-Resistant TiO2-CeO2 Composite and Its Catalytic Performance in the Oxidation of a Soluble Organic Fraction from Diesel Exhaust

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