Rapid synthesis of Fe-doped CuO-Ce0.8Zr0.2O2 catalysts for CO preferential oxidation in H2-rich streams: Effect of iron source and the ratio of Fe/Cu

Wang, Jing; Han, Cuiping; Gao, Xiaoya; Lu, Jichang; Wan, Gengpin; He, Dedong; Chen, Ran; Chen, Kezhen; He, Shan; Luo, Yongming

doi:10.1016/j.jpowsour.2017.01.084

Cited by 40 publications

(14 citation statements)

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“…Liable/reducible oxygen species are usually involved in the oxidation reactions over oxide catalysts. , In general, when an reactant is oxidized at the active surface, the oxidant is usually a surface lattice oxygen atom instead of gas-phase oxygen, which creates a surface oxygen vacancy. , The production of oxygen vacancies plays an important role in the formation of mobile oxygen species. As is known that the amount of oxygen vacancies can be estimated by several parameters, such as the ratio of Ce 3+ /(Ce 3+ +Ce 4+ ) from Ce 3d XPS, the value of A 599 / A 600 for Raman, and the ratio of O II /(O I +O II ) from O 1s XPS . According to the preceding result, these values are calculated to be 27.56, 0.67, 51.65 for CuCe-Fe sample, which is totally larger than that of 22.0, 0.60, 36.33, respectively, for CuCe sample.…”

Section: Resultsmentioning

confidence: 99%

“…In our previous literature, the different ratio of Fe/Cu and the different Fe precursors were selected to be doped on the CuO-Ce 0.8 Zr 0.2 O 2 materials for CO-PROX . In this work, simplified CuO-CeO 2 - and Fe-doped CuO-CeO 2 materials were prepared by the simple and solvent-free route of combustion synthesis.…”

Section: Introductionmentioning

confidence: 99%

“…In our previous literature, the different ratio of Fe/Cu and the different Fe precursors were selected to be doped on the CuO-Ce 0.8 Zr 0.2 O 2 materials for CO-PROX. 43 In this work, simplified CuO-CeO 2 -and Fe-doped CuO-CeO 2 materials were prepared by the simple and solvent-free route of combustion synthesis. With the aid of designed in situ TPR and the CO pulsing technique as well as in situ DRIFTS, the catalytic active center for CO-PROX over CuCe and CuCe-Fe were illuminated from the standpoint of the principle of were added into an agate mortar without additional water and then ground completely for 10 min, where a transparent and homogeneous viscous gel was obtained.…”

Section: Introductionmentioning

confidence: 99%

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Unravelling the Nature of the Active Species as well as the Doping Effect over Cu/Ce-Based Catalyst for Carbon Monoxide Preferential Oxidation

et al. 2019

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The active sites of a mixed Cu/Ce material and the doping effect of typical element (iron, Fe) on the active species and the catalytic behavior of Cu/Ce for CO preferential oxidation in rich H2 (CO-PROX) were investigated by in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), in situ oxygen storage capacity measurement (OSC) combined with designed temperature-programmed reduction (TPR), along with Raman, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and temperature-programmed desorption/reduction of CO (CO-TPD/TPR). These results showed that two kinds of surface active center were involved in the CuCe- and Fe-doped CuCe systems, that is, Cu+ as adsorption sites for the chemisorption and the activation of CO molecules, the surface reactive oxygen (the highly dispersed oxygen and surface lattice oxygen) that directly participated in the whole CO oxidation process. The addition of Fe into CuCe sample resulted in the incorporation of Fe into CeO2 lattice forming Fe–O–Ce structure and generated more oxygen vacancies, which not only enhanced the interaction between Cu and Ce to form more Cu+ absorption sites but also trapped the gas-phase oxygen and promoted the release of subsurface lattice oxygen to supply more reactive oxygen. Thus, the turnover frequency (TOF) value was increased from 3.62 × 10–2 s–1 for CuCe to 4.50 × 10–2 s–1 for Fe-doped CuCe. Moreover, with the enhancement of the lattice oxygen migration combined with the promotional role of Fe on the water gas shift (WGS), the capacity of the resistance to CO2 and H2O was enhanced for Fe-doping CuCe, and the corresponding stability time was largely prolonged from 170 to 400 h, in the coexistence of CO2 and H2O.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Unravelling the Nature of the Active Species as well as the Doping Effect over Cu/Ce-Based Catalyst for Carbon Monoxide Preferential Oxidation

et al. 2019

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“…A significant number of scientific publications have been devoted to the selective catalytic oxidation of CO, but the vast majority of works are based on noble and rare earth metals [2][3][4][5][6], the cost and limited availability of which prevents their widespread use, and therefore these works remain at the level of academic research. Replacement of expensive materials with relatively cheap onestransition metal oxides is the main line of research today [7][8][9][10].…”

Section: Doimentioning

confidence: 99%

SYNTHESIS, CHARACTERISTIC AND ACTIVITY OF NANOSIZED Cu–Me (Me–Co, Zn, Ni) OXIDE SYSTEMS IN CO OXIDATION IN THE PRESENCE OF H2

Jafarova¹

2021

AChJ

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Nanooxides of Cu–Me composition (Me–Co, Zn, Ni) were synthesized by hydrothermal reduction of metal salts with subsequent calcination and the influence of their properties (size, morphology, structure) on catalytic activity of deep CO oxidation reaction in the presence of H2 was considered. The nanooxides have been characterized by XRD and SEM methods. It was revealed that particles of Cu–Co–O are nanoplates (30–35 nm), and Cu–Zn–O (12.5–20 nm) are nanorods. The SEM method revealed a higher structural organization of the Cu–Сo–O particles than Cu–Zn–O; the growth of nanocrystals is shown by varying the magnification of the scale grid of images. The highest activity of the Cu–Co–O system was found among the mentioned and corresponding individual oxides. The effect of metal (Cu/Co) ratio on the dispersibility and morphology of nanoparticles and their activity has been studied. The non-additive increase in activity is explained by the redox properties of cobalt oxides and the contribution of copper to electronic state of this element. The variation of composition, as well as high dispersibility (30–35 nm) make it possible to reduce the temperature of oxidation beginning (T50%) of CO to less than 1150C

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“…For metal supported catalysts on CeO 2 (i.e Au, Pt, Rh) the presence of punctual defects on the metal oxide facilitates the interaction of the metallic phase with the support surface allowing a high dispersion and special dynamic interaction (electronic enrichment, redispersion process etc) [31]. Additionally modifying the chemical composition of CeO 2 with other oxides (i.e ZrO 2 , MnOx) also greatly improves the catalyst activity [32,33]. It is known that the introduction of zirconium enhances oxygen mobility even further by the formation of solid solution improving the redox properties and the oxygen buffering action observed for the Ce oxides [34].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of Rh/MnO 2 -CeO 2 /Al 2 O 3 catalysts for CO-PrOx reaction

Laguna

López-Cartés

2017

Molecular Catalysis

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Rh/MnO 2 -CeO 2 /Al 2 O 3 catalysts with different manganese-to-ceria ratios have been synthesized, characterized and tested in CO-PrOx reaction. The physicochemical properties of the solids were studied by XRD, Raman spectroscopy, BET surface area, H 2 -TPR, TGA-DTG and TEM. The differences observed in the textural, structural and redox properties were related to the Mn-toceria ratio of the samples. The segregation of Mn species was observed at high Mn-to-Ce ratios.In opposite way, MnO 2 -CeO 2 solid solutions were obtained at low Mn to Ce ones. In this last case, the physicochemical properties of the solids were favored by the intimate Rh-Ce-Mn contact. The effect of the Mn-Ce presence on Rh catalysts which promotes the catalytic behavior towards selective CO oxidation was observed to be better at low temperatures. At higher temperatures, Mn species promote the Reverse Water Gas Shift reaction, whilst ceria promotes the H 2 oxidation in the whole range of working temperatures.

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Rapid synthesis of Fe-doped CuO-Ce0.8Zr0.2O2 catalysts for CO preferential oxidation in H2-rich streams: Effect of iron source and the ratio of Fe/Cu

Cited by 40 publications

References 58 publications

Unravelling the Nature of the Active Species as well as the Doping Effect over Cu/Ce-Based Catalyst for Carbon Monoxide Preferential Oxidation

Unravelling the Nature of the Active Species as well as the Doping Effect over Cu/Ce-Based Catalyst for Carbon Monoxide Preferential Oxidation

SYNTHESIS, CHARACTERISTIC AND ACTIVITY OF NANOSIZED Cu–Me (Me–Co, Zn, Ni) OXIDE SYSTEMS IN CO OXIDATION IN THE PRESENCE OF H2

Synthesis and characterization of Rh/MnO 2 -CeO 2 /Al 2 O 3 catalysts for CO-PrOx reaction

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