Promotional effects of Ce, Mn and Fe oxides on CuO/SiO2 catalysts for CO oxidation

Xi, Xiaoyan; Ma, Shuangyan; Chen, Jianfeng; Zhang, Yi

doi:10.1016/j.jece.2014.03.021

Cited by 33 publications

(11 citation statements)

References 33 publications

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“…These results well consist of various reports 57. Xi et al54 observed a strong peak near 300 C in the TPR spectrum of Mn/SiO 2 catalyst, while other peaks occurred at 410 C which was weak. In the TPR spectrum of Mn/Al 2 O 3 catalyst, the reduction peaks are located at about 365 C and 460 C.…”

supporting

confidence: 92%

“…64 According to Figure 4, the peaks assigned to the strong interaction between active metals (Fe, Mn and Cu) with each other were not seen. However, Xi et al 54 pointed to a strong interaction between Fe 2 O 3 with CuO and Mn 2 O 3 with copper oxide which reveals the excellent dispersion of the copper oxide in the prepared catalyst. Also, no peaks related to the interaction between active metals with ZrO 2 support in the XRD spectrum were observed, which agreed well with TPR results.…”

Section: Resultsmentioning

confidence: 97%

“…This could be related to the segment of the Fe and Mn species which were not precipitated on the support surface during the catalyst preparation. 54 The XRD profile of the Fe-Mn-Cu/ZrO 2 catalyst was displayed in 60 The narrow sharp peaks display the hematite species have high crystallinity and prove the high purity of hematite nanoparticles via the coprecipitation method. All the peaks of iron (III) oxide agreed well with the hexagonal structure of α-Fe 2 O 3 and lattice constants of a = 0.5034 nm and c = 1.375 nm.…”

Section: Resultsmentioning

confidence: 99%

“…First peak was attributed to the reduction of small CuO particles which were highly dispersed on the CeO 2 , the second peak to bigger CuO particles on the support, the third peak to agglomerated CuO species and the fourth peak to the interaction between CuO and CeO 2 species 54. …”

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confidence: 99%

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Combined steam and dry reforming of methanol over Fe‐Mn‐Cu / ZrO ₂ catalyst to syngas formation: Study about kinetic and fuzzy model approaches

Mosayebi

Ahmadi

2021

Int J Energy Res

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Combined steam and dry reforming of methanol (CSDRM) experiments were applied to measure the responses of CH 3 OH conversion, H 2 /CO ratio, H 2 and CO yield at a temperature range of 300 C to 900 C, CO 2 /H 2 O ratio of 0.5 to 2.5 and (CO 2 + H 2 O)/CH 3 OH ratio of 1 to 3 on Fe-Mn-Cu/ZrO 2 catalyst in a fixed bed reactor. Fe-Mn-Cu/ZrO 2 catalyst was synthesized via the co-precipitation approach, and its physicochemical properties were examined through X-ray diffractometer, X-ray fluorescence, temperature-programmed reduction, N 2 adsorption/desorption and thermal gravimetric analysis tests. A kinetic model for CSDRM reaction was derived via the Langmuir-Freundlich method and the proposed mechanism included three reversible reactions on three types of active sites. A Mamdani-type fuzzy model was also developed for comparison purposes, as there was no need for detailed knowledge of the process. The error of the kinetic and Mamdani-type fuzzy model approaches obtained 12.69% and 16.42%, respectively. H 2 yield obtained from kinetic model values was closer to the experimental data compared to other responses. However, for the fuzzy model approach, the difference between experimental and calculated methanol conversion was lower. K E Y W O R D S combined steam and dry reforming of methanol, Fe-Mn-Cu/ZrO 2 catalyst, kinetic model, Langmuir-Freundlich, Mamdani-type fuzzy model

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supporting

confidence: 92%

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

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Combined steam and dry reforming of methanol over Fe‐Mn‐Cu / ZrO ₂ catalyst to syngas formation: Study about kinetic and fuzzy model approaches

Mosayebi

Ahmadi

2021

Int J Energy Res

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“…It is necessary to note that SiO 2 is an inert support in addition to its high mechanical strength and thermal stability . Although the activity of Cu–SiO 2 catalysts in the CO oxidation reaction was generally unsatisfactory, it has been reported that the addition of CeO 2 could considerably enhance their catalytic activity. ,− Particularly, Águila et al found that compared to Al 2 O 3 , the inertness of SiO 2 facilitated the formation of the copper–ceria interface on its surface, which was the active phase in CO oxidation . Afterward, they found out that loading CuO after impregnating with a Ce precursor was more conducive to the formation of CuO species in contact with CeO 2 than the co-impregnation method .…”

Section: Introductionmentioning

confidence: 99%

CeO₂@SiO₂ Core–Shell Nanostructure-Supported CuO as High-Temperature-Tolerant Catalysts for CO Oxidation

Song

Wang

et al. 2019

Langmuir

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Supported CuO–CeO2 catalysts have been extensively studied for their outstanding catalytic activity in CO oxidation. Unfortunately, they are prone to sintering and deactivation when exposed to high-temperature automotive exhausts. Herein, taking advantage of the heat-resistant SiO2 microspheres, we fabricated a series of core–shell-structured yCuO–xCeO2@SiO2 (x is the weight ratio of CeO2–SiO2 and y is the weight ratio of Cu–(CeO2@SiO2)) composite catalysts. All the small CeO2 particles were bound to the SiO2 spheres, forming an xCeO2@SiO2 structure, on the surface of which a certain amount of CuO was well-dispersed. The 5CuO–50CeO2@SiO2 catalyst exhibited good activity, with the full conversion of CO achieved at around 130 °C, and no obvious deactivation was observed in the stability test. Importantly, the interaction between CuO and CeO2@SiO2 enhanced its durability at high temperatures. Even at 800 °C and with a space velocity of 800 000 mL·gcat –1·h–1, CO conversion could be maintained at 90%, which is prospectively applied in a real CO elimination system. The result of the temperature-programmed reduction in hydrogen demonstrated that this special core–shell-structured 5CuO–50CeO2@SiO2 catalyst improved the reduction ability of the CuO species. In situ diffuse reflectance infrared Fourier transform spectroscopy measurements further confirmed that CO molecules preferred to be adsorbed on Cu(I) species to form reactive CO–Cu(I) that enhanced the reactivity of the 5CuO–50CeO2@SiO2 catalyst.

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Synergistic Effect of CuGeO₃/Graphene Composites for Efficient Oxygen–Electrode Electrocatalysts in Li–O₂ Batteries

Lee

Sung

Kim

et al. 2018

Advanced Energy Materials

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density of lithium-oxygen batteries (LOBs) (3623 W h kg −1 ) approaches that of gasoline. [6][7][8][9] Oxygen is an environmentally benign and abundant gas source that can maximize the actual practical energy density due to its light weight. The reversible electrochemical reaction that leads to the operation of nonaqueous LOBs is 2Li + O 2 ↔ Li 2 O 2 (2.98 V vs Li/Li + ). This electrochemical reaction between lithium and oxygen forms solid discharge products (Li 2 O 2 ), nucleates, and grows on an oxygen electrode (cathode) during discharge, and subsequently decomposes during recharge. The electrocatalysts in the oxygen electrode for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) play a key role in improving the power density, cycle-life, and round-trip efficiency for LOBs.Because the oxygen-electrode structure needs oxygen pathway and Li 2 O 2 storage surface to complete the electrochemical reaction, the oxygen electrode is loaded with porous materials as the electrocatalysts with high surface area and a good electrical conductivity. Carbon materials have been intensively studied owing to their high electrical conductivity, light weight, low cost, and easy fabrication of porous structure. [10][11][12][13][14][15][16] Among carbon materials, 2D planar graphene has excellent performance that enables the adsorption of a large amount of oxygen on both sides to support preservative and discharge products compared to other carbon materials. [10,[17][18][19][20] The excellent performance of porous graphene was found to deliver an exceptionally high capacity, which is contributed to the unique porous structure of the electrode. Graphene with large interconnected tunnels can facilitate rapid O 2 diffusion and provide high reactive sites for combine reactions of lithium and oxygen. [21] Graphene exhibits ORR activity owing to the abundant defects in the discharging process. However, graphene alone is insufficient because it exhibits low catalytic activity toward OER in the charging process. [22][23][24][25][26] Thus, single graphene-loaded electrodes lead to large overpotentials and low round-trip efficiency.To solve these problems, bifunctional electrocatalysts integrated with oxygen electrodes have been developed to reduce the asymmetry between charge-discharge overpotentials and improve the round-trip efficiency of the LOBs. [10,15,16,22,24,27] Graphene has been used as the matrix for supporting 3d transition metal oxides, such as CuO, MnO 2 , and Co 3 O 4 , to form composite structures with synergistic effects for both ORR and OER.Hybridized 1D/2D CuGeO 3 /graphene composites are applied as the oxygenelectrode electrocatalysts for Li-O 2 batteries. The CuGeO 3 /graphene composites are synthesized by the crystallographic alignment of CuGeO 3 nanowires on graphene, rendering strong heteroepitaxial coupling between the 1D oxide nanostructures and the 2D electrically conducting graphene. The inherited excellent electrocatalytic activity of the CuGeO 3 /graphene composites leads to lower overpotentials...

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Promotional effects of Ce, Mn and Fe oxides on CuO/SiO2 catalysts for CO oxidation

Cited by 33 publications

References 33 publications

Combined steam and dry reforming of methanol over Fe‐Mn‐Cu / ZrO ₂ catalyst to syngas formation: Study about kinetic and fuzzy model approaches

Combined steam and dry reforming of methanol over Fe‐Mn‐Cu / ZrO ₂ catalyst to syngas formation: Study about kinetic and fuzzy model approaches

CeO₂@SiO₂ Core–Shell Nanostructure-Supported CuO as High-Temperature-Tolerant Catalysts for CO Oxidation

Synergistic Effect of CuGeO₃/Graphene Composites for Efficient Oxygen–Electrode Electrocatalysts in Li–O₂ Batteries

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Promotional effects of Ce, Mn and Fe oxides on CuO/SiO2 catalysts for CO oxidation

Cited by 33 publications

References 33 publications

Combined steam and dry reforming of methanol over Fe‐Mn‐Cu / ZrO 2 catalyst to syngas formation: Study about kinetic and fuzzy model approaches

Combined steam and dry reforming of methanol over Fe‐Mn‐Cu / ZrO 2 catalyst to syngas formation: Study about kinetic and fuzzy model approaches

CeO2@SiO2 Core–Shell Nanostructure-Supported CuO as High-Temperature-Tolerant Catalysts for CO Oxidation

Synergistic Effect of CuGeO3/Graphene Composites for Efficient Oxygen–Electrode Electrocatalysts in Li–O2 Batteries

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Combined steam and dry reforming of methanol over Fe‐Mn‐Cu / ZrO ₂ catalyst to syngas formation: Study about kinetic and fuzzy model approaches

Combined steam and dry reforming of methanol over Fe‐Mn‐Cu / ZrO ₂ catalyst to syngas formation: Study about kinetic and fuzzy model approaches

CeO₂@SiO₂ Core–Shell Nanostructure-Supported CuO as High-Temperature-Tolerant Catalysts for CO Oxidation

Synergistic Effect of CuGeO₃/Graphene Composites for Efficient Oxygen–Electrode Electrocatalysts in Li–O₂ Batteries