Monolithic Mn/Ce-based catalyst of fibrous ceramic membrane for complete oxidation of benzene

Cuo, Zhaxi; Deng, Yangbo; Li, Wenhui; Peng, Shengpan; Zhao, Feng; Liu, Haidi; Chen, Yunfa

doi:10.1016/j.apsusc.2018.06.207

Cited by 65 publications

(25 citation statements)

References 34 publications

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“…Nowadays, fiber-based membranes, having good mass transfer as well as relative low pressure drop, attract more and more attention as novel monolithic carriers [17]. Cuo et al [18] prepared porous ceramic membranes by using mullite fibers as a raw material, and kaolin and feldspar as binders. The uniform interconnected pore structure not only facilitated the dispersion of Mn-Ce particles but also kept a relative low pressure drop.…”

Section: Monolithic Carriersmentioning

confidence: 99%

Fabrication of Monolithic Catalysts: Comparison of the Traditional and the Novel Green Methods

et al. 2019

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Monolithic catalysts have great industrial application prospects compared to powdered catalysts due to their low pressure drop, the high efficiency of mass and heat transfer, and recyclability. Deposition of active phases on the monolithic carriers dramatically increases the utilization rate and has been attracting continuous attention. In this paper, we reviewed the traditional (impregnation, coating, and spraying) and novel (hydrothermal and electrodeposition) strategies of surface deposition integration, analyzed the advantages and disadvantages of both ways, and then prospected the possible directions for future development of integration technologies.

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Section: Monolithic Carriersmentioning

confidence: 99%

Fabrication of Monolithic Catalysts: Comparison of the Traditional and the Novel Green Methods

et al. 2019

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“…The original PCMs were prepared through molding method as detailed in our previous works [12,19]. In brief, a raw mixture containing short-cut mullite fiber, binder of kaolin and kalialbite, carboxymethylcellulose, corn starch, as well as deionized water was ball-milled proportionally to form the slurry.…”

Section: Preparation Of Pcms and Catalytic Pcmsmentioning

confidence: 99%

“…Therefore, a monolithic catalyst by functionalizing the PCMs with catalytic active ingredients is much necessary for the removal of VOCs during dedusting for air pollution control in the industrial application.Currently, the transition metal oxide catalysts, by considering economical and effective elements, are better alternatives in contrast to the noble metal catalysts [17,18]. Among all the transition metals, the synergistic effect of Mn and Ce mixed oxides exhibited enhanced catalytic activity during benzene oxidation [19][20][21][22][23] that generally attributed to the abundance, low cost, numerous oxidation states, and high poison-resistance of manganese oxides [24,25], and the super oxygen storage capacity of ceria oxides which are regarded as viable segments in the VOCs oxidation [26,27]. Moreover, to further improve physiochemical properties, the ternary metal oxides catalysts (e.g., Mn-Ce-Co [28,29], Mn-Ce-Zr [30], Mn-Ce-Cu [31-33],) are popularly used in the field of VOCs removal.…”

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confidence: 99%

A Novel Porous Ceramic Membrane Supported Monolithic Cu-Doped Mn–Ce Catalysts for Benzene Combustion

et al. 2019

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Porous ceramic membranes (PCMs) are considered as an efficient hot gas filtration material in industrial systems. Functionalization of the PCMs with high-efficiency catalysts for the abatement of volatile organic compounds (VOCs) during dust elimination is a promising way to purify the industrial exhaust gases. In this work, we prepared PCMs (porosity: 70%) in a facile sintering process and integrated Cu-doped Mn-Ce oxides into the PCMs as monolithic catalysts by the sol-gel method for benzene oxidation. Through this method, the catalysts are dispersed evenly throughout the PCMs with excellent adhesion, and the catalytic PCMs provided more active sites for the reactant gases during the catalytic reaction process compared to the powder catalysts. The physicochemical properties of PCMs and catalytic PCMs were characterized systematically, and the catalytic activities were measured in total oxidation of benzene. As a result, all the prepared catalytic PCMs exhibited high catalytic activity for benzene oxidation. Significantly, the monolithic catalyst of Cu 0.2 Mn 0.6 Ce 0.2 /PCMs obtained the lowest temperature for benzene conversion efficiency of 90% (T 90 ) at 212 • C with a high gaseous hourly space velocity of 5000 h −1 and showed strong resistance to high humidity (90 vol.%, 20 • C) with long-term stability in continuous benzene stream, which is caused by abundant active adsorbed oxygen, more surficial oxygen vacancy, and lower-temperature reducibility.higher conversion efficiency at lower temperature [13][14][15][16]. A successful catalyst used for industrial applications usually requires high activity, stability, heat resistance, and low pressure drop during long-term operation for high airflow gaseous catalytic combustion. Therefore, a monolithic catalyst by functionalizing the PCMs with catalytic active ingredients is much necessary for the removal of VOCs during dedusting for air pollution control in the industrial application.Currently, the transition metal oxide catalysts, by considering economical and effective elements, are better alternatives in contrast to the noble metal catalysts [17,18]. Among all the transition metals, the synergistic effect of Mn and Ce mixed oxides exhibited enhanced catalytic activity during benzene oxidation [19][20][21][22][23] that generally attributed to the abundance, low cost, numerous oxidation states, and high poison-resistance of manganese oxides [24,25], and the super oxygen storage capacity of ceria oxides which are regarded as viable segments in the VOCs oxidation [26,27]. Moreover, to further improve physiochemical properties, the ternary metal oxides catalysts (e.g., Mn-Ce-Co [28,29], Mn-Ce-Zr [30], Mn-Ce-Cu [31-33],) are popularly used in the field of VOCs removal. Such series of catalysts exhibit higher catalytic activity than binary and single metal oxides and show excellent stability and water vapor resistance properties during a long-term reaction due to the synergistic effects. The ionic radius of Cu is between the ionic radius of Mn and Ce, so the Cu ions ...

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“…In this study, the electric field was applied to improve benzene oxidation over Pd based catalysts. It is generally recognized that Ce oxides possess high oxygen storage capacity and can improve the metal dispersion [2,7,9,[19][20][21]. Co addition in the support can increase the surface acidic sites and the dispersion of active components [22].…”

Section: Benzene Oxidation Activitymentioning

confidence: 99%

“…Exposure to VOCs can induce mutagenic and teratogenic effects on human body and cause cancer, cardiovascular, and other insusceptible diseases. Among various VOC removal methods, catalytic oxidation has been suggested as the most effective technique and has been extensively investigated for many decades [2][3][4][5][6][7][8][9][10][11]. Precious metal based catalysts such as Pd and Pt have be proved to be highly active for benzene oxidation.…”

Section: Introductionmentioning

confidence: 99%

Electric Field Promoted Complete Oxidation of Benzene over PdCexCoy Catalysts at Low Temperature

Shen

et al. 2019

Catalysts

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The application of electric field promotes benzene oxidation significantly over Pd/CoxCey catalysts. For 1% Pd loading catalysts, the complete oxidation of benzene can be realized at 175 °C with an electric field under an input current of 3 mA, 79 °C lower than the temperature demanded for complete benzene conversion without electric field. The introduction of electric field can save Pd loading in the catalysts while maintaining high benzene conversion. The characterization experiments showed that CeO2 reduction was accelerated with electric field and created more active oxygen, promoting the formation of active sites on the catalyst surface. The OH removal ability of PdO was enhanced by forming CoO(OH) species, which can easily dehydroxylate since the reduction of Co3+ was promoted by the electric field. The optimized Ce/Co ratio is a balance between oxygen availability and OH removal ability.

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Monolithic Mn/Ce-based catalyst of fibrous ceramic membrane for complete oxidation of benzene

Cited by 65 publications

References 34 publications

Fabrication of Monolithic Catalysts: Comparison of the Traditional and the Novel Green Methods

Fabrication of Monolithic Catalysts: Comparison of the Traditional and the Novel Green Methods

A Novel Porous Ceramic Membrane Supported Monolithic Cu-Doped Mn–Ce Catalysts for Benzene Combustion

Electric Field Promoted Complete Oxidation of Benzene over PdCexCoy Catalysts at Low Temperature

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