Insight into the improvement effect of the Ce doping into the SnO2 catalyst for the catalytic combustion of methane

Liu, Cheng; Xian, Hui; Jiang, Zheng; Wang, Lihua; Zhang, Houcheng; Zheng, Lirong; Tan, Yisheng; Li, Xingang

doi:10.1016/j.apcatb.2015.04.042

Cited by 124 publications

(90 citation statements)

References 59 publications

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“…For CuO, the big reduction peak centered at 307 8Ci sa ssigned to the reduction of Cu 2+ + to Cu 0 .F or SnO 2 ,t he resultso fm any previouss tudies indicate that the reduction peak below 400 8C is relatedt os urfaceS n 4+ + to Sn 2+ + reduction, [11,24] whereas the high-temperature reduction peak (at approximately 600 8C) is attributed to the reduction of both the surface Sn 2+ + and bulk Sn 4+ + to Sn 0 . [11] Clearly,t he H 2 -TPR profiles of the CuO-SnO 2 catalysts display as imilars hape. We can divide these profiles into three groups: below 250 8C, at approximately 350 8C, and above 450 8C.…”

Section: H 2 -Tprmentioning

confidence: 52%

“…They modified SnO 2 with Cu, [1a] Fe, [10a] Ce, [10b] Ta , [10c] Cr, [10d] and Pr, [10e] and the obtained catalysts showedc onsiderable activity for catalytic CO or/and CH 4 oxidation. In our previous work, [11] Sn 1Àx Ce x O 2 catalysts showed an excellent catalytic performance in the catalytic combustion of CH 4 .S urface Sn 4+ + was identified as the active site fort he reaction. Moreover,t hese Sn 1Àx Ce x O 2 catalysts show an excellent water resistance.…”

Section: Introductionmentioning

confidence: 95%

“…This may be because the replenishmentp rocess of the consumed active oxygen species, that is, surfacel attice oxygen,i ss of ast that the reactionr ate is not influenced by the partial pressure of gaseous O 2 . [11] In addition, SnCu30 has the highest O latt. /O ads.…”

Section: Kinetics Measurementsmentioning

confidence: 99%

“…Moreover,t hese Sn 1Àx Ce x O 2 catalysts show an excellent water resistance. [11] Presently,C u-modified SnO 2 materials have attracted much attention in many fields, such as in gas sensors, [12] electrodes, [13] ceramics, [14] and photocatalysts, [15] but there have been relativelyf ew studies on CuO-SnO 2 catalysts for pollutant elimination. [1a, b, 16] Wang et al [1a] prepared as eries of Cu x Sn 1Àx O y catalysts with high surface areas by coprecipitation.…”

Section: Introductionmentioning

confidence: 99%

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Insight into Copper Oxide‐Tin Oxide Catalysts for the Catalytic Oxidation of Carbon Monoxide: Identification of Active Copper Species and a Reaction Mechanism

et al. 2017

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Herein, we report the high activity of CuO‐SnO2 catalysts for the catalytic oxidation of CO. In particular, SnCu30 shows the highest activity and a high water resistance. If we compare the XRD, X‐ray absorption fine structure, and H2 temperature‐programmed reduction results of SnCu30 before and after HNO3 treatment, we find the existence of three kinds of Cu species in the catalyst, that is, highly dispersed CuO, bulk CuO, and Cu incorporated in the SnO2 lattice. The highly dispersed CuO and the surface lattice oxygen species are the active sites for the catalytic oxidation of CO. We used X‐ray photoelectron spectroscopy and in situ diffuse reflectance infrared Fourier transform spectroscopy to confirm the existence of Cu+ species on the surface of the CuO‐SnO2 catalysts, which can provide the adsorption sites for CO. Our results show that the reaction pathways of the catalytic oxidation of CO over the CuO‐SnO2 catalysts follow the Mars–van Krevelen model.

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Section: H 2 -Tprmentioning

confidence: 52%

Section: Introductionmentioning

confidence: 95%

Section: Kinetics Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Insight into Copper Oxide‐Tin Oxide Catalysts for the Catalytic Oxidation of Carbon Monoxide: Identification of Active Copper Species and a Reaction Mechanism

et al. 2017

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“…Methane is an economical and clean alternative to fuels; it is used to produce energy in gas turbine combustors and as a new energy for vehicles [1]. The advantage of catalytic combustion of methane is that operates at much lower temperatures than flame combustion, which greatly reduces the noxious emissions of nitrogen oxides, NO x and unburned hydrocarbons [2].…”

Section: Introductionmentioning

confidence: 99%

Effect of Zirconium and Cerium Loadings on Aerogel Pd-Based Catalysts for Methane Combustion

Sadouki¹,

Fessi²,

Ksibi³

et al. 2018

AMPC

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Aerogel Pd/(Ce 0.33 Zr 0.66 O 2 )SiO 2 catalysts (CeZry) were prepared with variable Ce and Zr loadings (molar ratio Ce/Zr = 1/2) by combining sol-gel and impregnation methods. First, N 2 -physisorption was used to investigate the texture evolution. Then, H 2 -chimisorption and TEM were performed to study the effect on particle dispersion. After, TPR was used to determine the catalyst reducibility. Furthermore, XPS characterization was done to identify the palladium oxidation state and to evaluate the Pd-support interaction. Finally, the prepared catalysts were tested in methane combustion to assess their catalytic activity. The obtained results showed that, when the Zr and Ce loadings are varied between 0% and 8% and between 0% and 6% respectively, the BET surface area was increased from 615 to 744 m 2 /g, the porosity diameter from 45.7 to 83.6 Å, the Pd particle diameter from 5.2 to 7.0 nm, the CeO 2 and ZrO 2 particle size from 0 to 68 nm, the reduction temperature shift reached 16˚C, the Pd binding energy shift attained 0.6 eV, but an optimum amounts of Zr (4 wt.%) and Ce (3 wt.%) are needed to maximize the PdO reducibility and to enhance the catalytic activity. In effect, 100% conversion of methane was reached at around 415˚C on the CeZr4 catalyst.

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Bowtie‐Shaped NiCo₂O₄ Catalysts for Low‐Temperature Methane Combustion

Dai

Kumar

Zhu

et al. 2019

Adv Funct Materials

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Bowtie-shaped NiCo 2 O 4 nanostructures are prepared using a hydrothermal method. Variation of the synthesis parameters, including reaction time, additives, and calcination temperature, allows an understanding of the origin of the bowtie-shaped structure to be developed. Methane oxidation experiments performed using temperature-programed oxidation (TPO) show that the new materials, which do not contain precious metals, have excellent activity for low-temperature methane combustion, with 100% conversion at ≈410 °C (gas hourly space velocity (GHSV): 90 000 mL (STP) g −1 h −1 ). The structure-activity relationships of the bowtie-shaped nanostructures are explored. The relatively low exhaust temperature in NGVs means that the activation of methane, which has the strongest CH bond of any hydrocarbon, is challenging from a chemical perspective. It is not surprising that the quest for effective lowtemperature methane oxidation catalysts has focused mainly on systems involving precious metals, such as platinum and palladium. [11][12][13][14][15] Metal oxidesupported PdO catalysts are generally considered to represent the state of the art for methane combustion catalysts. [16][17][18][19][20] Recent research in this field has focused on improving activity at low temperatures, [21,22] reducing the required loading of metal [23,24] and improving the thermal and hydrothermal stability of PdO catalysts. [25][26][27][28][29][30] Exciting recent advances include the development of core-shell Pd@CeO 2 catalysts with high activity and thermal stability, demonstrating complete conversion to CO 2 below 400 °C (gas hourly space velocity (GHSV) = 200 000 mL g −1 h −1 ). [21] Pd@ZrO 2 /Si-Al 2 O 3 catalysts that are stable in the presence of high concentrations of water vapor have also been proposed recently. [25] NiO@PdO/Al 2 O 3 catalysts that show good activity and stability with only 0.2 wt% Pd loading have been prepared [23] as well as Pd-based bimetallic nanocrystalline catalysts, in which the promotional effects of different transition metals have been examined. [26] Although Pd-based catalysts show excellent activity, the high price and low abundance of palladium are limiting factors to practical application, [31] and both the hydrothermal stability and SO 2 tolerance for these catalysts need to be improved. For this reason, the development of alternative catalysts based on non-noble metals is attractive. [32] These include single metal oxide-based catalysts (CuO, [33] Co 3 O 4 , [34] and MnO 2 [35] ), perovskite, [36,37] spinel, [38,39] and hexaaluminate [40] catalysts. Among these, Co 3 O 4 exhibits good activity for methane combustion attributed to a spinel-type structure with variable Co oxidation states and a high density of oxygen vacancies on the surface. [41] Additionally, the specific exposed facets and morphology of Co 3 O 4 plays an important role in the catalysis. [42,43] Materials with exposed (110) planes show enhanced catalytic activity for methane oxidation compared with those only exposing (100) or (111) face...

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Insight into the improvement effect of the Ce doping into the SnO2 catalyst for the catalytic combustion of methane

Cited by 124 publications

References 59 publications

Insight into Copper Oxide‐Tin Oxide Catalysts for the Catalytic Oxidation of Carbon Monoxide: Identification of Active Copper Species and a Reaction Mechanism

Insight into Copper Oxide‐Tin Oxide Catalysts for the Catalytic Oxidation of Carbon Monoxide: Identification of Active Copper Species and a Reaction Mechanism

Effect of Zirconium and Cerium Loadings on Aerogel Pd-Based Catalysts for Methane Combustion

Bowtie‐Shaped NiCo₂O₄ Catalysts for Low‐Temperature Methane Combustion

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Insight into the improvement effect of the Ce doping into the SnO2 catalyst for the catalytic combustion of methane

Cited by 124 publications

References 59 publications

Insight into Copper Oxide‐Tin Oxide Catalysts for the Catalytic Oxidation of Carbon Monoxide: Identification of Active Copper Species and a Reaction Mechanism

Insight into Copper Oxide‐Tin Oxide Catalysts for the Catalytic Oxidation of Carbon Monoxide: Identification of Active Copper Species and a Reaction Mechanism

Effect of Zirconium and Cerium Loadings on Aerogel Pd-Based Catalysts for Methane Combustion

Bowtie‐Shaped NiCo2O4 Catalysts for Low‐Temperature Methane Combustion

Contact Info

Product

Resources

About

Bowtie‐Shaped NiCo₂O₄ Catalysts for Low‐Temperature Methane Combustion