Synthesis of Cu-Ce/KIT-6 materials for SOx removal

Gaudin, Pierrick; Dorge, Sophie; Nouali, Habiba; Kehrli, Damaris; Michelin, Laure; Josien, Ludovic; Fioux, Philippe; Vidal, Loı̈c; Soulard, Michel; Vierling, Matthieu; Molière, Michel; Brilhac, Jean-François; Patarin, Joël

doi:10.1016/j.apcata.2014.11.024

Cited by 37 publications

(16 citation statements)

References 62 publications

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“…The Cu 2 + /Cu + ratio decreases significantly from 2.06 for CuZr/Ti to 1.68 for CuCeZr/Ti. This result is in agreement with those reported by Gaudin et al [9] and indicates that the presence of cerium oxide favors the formation of Cu + species. Quantitative data give Ce 3 + /Ce 4 + ratios of 0.319 for CuCeZr/Ti and 0.758 for CeZr/Ti.…”

Section: Xps Analysissupporting

confidence: 94%

Self-sustained catalytic combustion of carbon monoxide ignited by dielectric barrier discharge

Bin

Wei

et al. 2017

Proceedings of the Combustion Institute

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This paper presents the results of a study of self-sustained catalytic combustion of CO ignited by dielectric barrier discharge (DBD) using Ce 0.5 Zr 0.5 O y /TiO 2 (CeZr/Ti), CuZr 0.25 O y /TiO 2 (CuZr/Ti), and CuCe 0.75 Zr 0.25 O y /TiO 2 (CuCeZr/Ti) catalysts. DBD excites and dissociates some of the reactant molecules in the gas phase. These are more easily adsorbed on the catalyst surface than are ground-state species, therefore induction begins at a lower background temperature than in thermal catalysis. CO is adsorbed on copper sites, therefore CeZr/Ti is inactive in CO ignition, but CuZr/Ti and CuCeZr/Ti achieve DBD ignition at 34 and 44 s, respectively, at a specific energy density (SED) of 1500 J/L. CO catalytic ignition by DBD involves two steps. The induction process is dominated by plasma catalysis. At the same SEDs, induction with CuCeZr/Ti begins earlier than those with CuZr/Ti, in good agreement with the reducibilities and oxygen-transfer properties of these catalysts. The ignition process is governed by thermal catalysis because the enhancement of external diffusion induced by increasing the temperature improves the reaction rate. CuZr/Ti provided more CO adsorption sites than did CuCeZr/Ti, contributing to shortening of the ignition delay.

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Section: Xps Analysissupporting

confidence: 94%

Self-sustained catalytic combustion of carbon monoxide ignited by dielectric barrier discharge

Bin

Wei

et al. 2017

Proceedings of the Combustion Institute

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“…This result suggests that the addition of CuO can inhibit the growth of CeO 2 crystals during the calcination process. [27][28][29] On the other hand, the crystal size of CeO 2 enlarged slightly with the increase in metal loading from 10 to 40 wt%, which is connected with excessive Ce species aggregation on the surface of MCF.…”

Section: Effect Of the Total Metal Loadingmentioning

confidence: 99%

“…Therefore, the signal is only partially collected. 29 The O 1s, Ce 3d, and Cu 2p 3/2 XPS spectra of the CuO-CeO 2 / MCF catalysts are shown in Fig. 5(A-C).…”

Section: Effect Of the Total Metal Loadingmentioning

confidence: 99%

Preparation and characterization of mesostructured cellular foam silica supported Cu–Ce mixed oxide catalysts for CO oxidation

et al. 2017

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“…As mentioned, if only linking the change trend of Ce(III) composition with that of the oxygen vacancy concentration among samples, a con°ict result could present; however, when taking the sum composition of Ce(III) and Cu(I) as a comprehensive indication among samples, interestingly, a roughly proportional increase in oxygen vacancy concentration or Os composition with the increased (Ce(III) þ Cu(I)) composition appeared among samples, clearly illuminating that besides of Ce(III), Cu(I) was also an important contributor to manipulate the surface feature such as the composition of active oxygen species along Ce-O-Cu interface. 19,22,24,[34][35][36][37] The phenomenon was particularly prominent on CeO x^C uO-EE samples, again, which could be attributed to the advantage of constructing more interactive Ce-O-Cu interface from the etchingembedding preparation. In addition, Ce(III) composition change was opposite to Cu(I) composition change among samples, the situation could be mainly assigned to the feature of etching-embedding preparation for getting CeO x^C uO-EE samples, as mentioned, Ce(IV) etch Cu 2 O to produce Cu 2þ and Ce(III), the reaction direction would lead to an opposite composition change for Cu(I) and Ce(III) species.…”

Section: -7mentioning

confidence: 99%

Efficiently Engineering Cu-Based Oxide by Surface Embedding of Ce for Selective Catalytic Reduction of NO with NH₃

Sun

Zeng

Xing

et al. 2019

NANO

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Deliberately engineering oxide composites on constructing and manipulating interactive structures particularly in surface layers was highly desirable for heterogeneous catalysis. Herein, upon the redox replacement reaction between Ce(IV) precursor (Ce(NO[Formula: see text] and Cu2O nano-substrate, an attempt to directly engineer the surface structure of Cu-based substrate was performed by the Ce(IV)–Cu2O etching-embedding process, then the obtained powders were thermo-treated to get a series of Ce–O–Cu catalysts with different Ce:Cu molar ratios for NH3 selective catalytic reduction (NH3-SCR) of NO. Characterized by ICP-OES, XRD, Raman, XPS, SEM, BET, H2-TPR, NO- and NH3-TPD measurements, it was demonstrated that the Cu–O–Ce catalysts were structured as CuO matrix with an interactive surface composed by co-present Cu(I)–Cu(II) and Ce(III)–Ce(IV) species, even the introduction of Ce was confined in a quite low loading range (0.83–2.3[Formula: see text]wt.%); such a surface exhibited the distinct synergistic effect with positively manipulated physical-chemistry properties such as active site distributions, redox features and surface reactivity compared to pure CuO and traditional Cu–Ce composite catalyst, leading to attractive catalytic performance such as [Formula: see text]% NO conversion with [Formula: see text]% N2 selectivity and the two-fold TOF enhancement versus traditional catalysts, even SO2 was present in reactant mixture on well-manipulated catalyst (Ce loading at 1.6[Formula: see text]wt.%) These results indicated that the etching-embedding strategy illuminated in this work could be referred as a feasible method to directly engineer and construct interactive oxide composite surface for advanced application as well as current efficient Ce–O–Cu catalytic interface for heterogeneous catalysis.

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Synthesis of Cu-Ce/KIT-6 materials for SOx removal

Cited by 37 publications

References 62 publications

Self-sustained catalytic combustion of carbon monoxide ignited by dielectric barrier discharge

Self-sustained catalytic combustion of carbon monoxide ignited by dielectric barrier discharge

Preparation and characterization of mesostructured cellular foam silica supported Cu–Ce mixed oxide catalysts for CO oxidation

Efficiently Engineering Cu-Based Oxide by Surface Embedding of Ce for Selective Catalytic Reduction of NO with NH₃

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Synthesis of Cu-Ce/KIT-6 materials for SOx removal

Cited by 37 publications

References 62 publications

Self-sustained catalytic combustion of carbon monoxide ignited by dielectric barrier discharge

Self-sustained catalytic combustion of carbon monoxide ignited by dielectric barrier discharge

Preparation and characterization of mesostructured cellular foam silica supported Cu–Ce mixed oxide catalysts for CO oxidation

Efficiently Engineering Cu-Based Oxide by Surface Embedding of Ce for Selective Catalytic Reduction of NO with NH3

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Efficiently Engineering Cu-Based Oxide by Surface Embedding of Ce for Selective Catalytic Reduction of NO with NH₃