Synthesis and characterization of CuO/ZnO–Al2O3 catalyst washcoat thin films with ZrO2 sols for steam reforming of methanol in a microreactor

Lin, Kuen‐Song; Pan, Cheng-Yu; Chowdhury, Sujan; Lu, Wei; Yeh, C.L.

doi:10.1016/j.tsf.2011.01.019

Cited by 9 publications

(10 citation statements)

References 29 publications

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“…They are dissolved into the liquid phase so they can closely interact with the powder surface, allowing particle dispersion and slurry stabilization [27][28][29]. Many papers are reported in the literature regarding formulation and its effect on resulting slurries [30][31][32]. However, to our knowledge, fewer works have been reported on the production of slurries for coating deposition, via dipping, of low surface area powders onto open cell foams.…”

Section: Introductionmentioning

confidence: 99%

Washcoat Deposition of Ni- and Co-ZrO2 Low Surface Area Powders onto Ceramic Open-Cell Foams: Influence of Slurry Formulation and Rheology

et al. 2015

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Abstract:The effect of formulations and procedures to deposit thin active layers based on low surface area powders on complex geometry substrates (open-cell foams) was experimentally assessed. An acid-free liquid medium based on water, glycerol, and polyvinyl alcohol was used for powder dispersion, while a dip-coating technique was chosen for washcoat deposition on 30 PPI ceramic open-cell foams. The rheological behavior was explained on the bases of both porosity and actual powder density. It was proved that the use of multiple dippings fulfills flexibility requirements for washcoat load management. Multiple depositions with intermediate flash drying steps at 350 °C were carried out. Washcoat loads in the 2.5 to 22 wt. % range were obtained. Pore clogging was seldom observed in a limited extent in samples with high loading (>20 wt. %). Adhesion, evaluated by means of accelerated stress test in ultrasound bath, pointed out good results of all the deposited layers.

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Section: Introductionmentioning

confidence: 99%

Washcoat Deposition of Ni- and Co-ZrO2 Low Surface Area Powders onto Ceramic Open-Cell Foams: Influence of Slurry Formulation and Rheology

et al. 2015

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“…51 A shoulder at 935.4 eV on the 2p3/2 peak suggests a charge transfer from metal ions toward the support, and the formation of species in which copper is in strong interaction with the support. 44,[52][53][54] A small satellite peak, arising from the 3d-4s transition during the relaxation process, 55 is observed at 944.5 eV, (11.2 eV from the main peak). XPS thus indicates the existence of Cu 2+ species in two different chemical environments: the contribution at BE = 933.3 eV is attributed to highly dispersed CuO, while the value at BE = 935.4 eV is assigned to copper in a CuAl2O4 spinel phase.…”

Section: Nature and Reducibility Of The Copper Phasesmentioning

confidence: 99%

Enhancement of the dispersion and catalytic performances of copper in the hydrogenation of cinnamaldehyde by incorporation of aluminium into mesoporous SBA-15 silica

Ungureanu

Chirieac

Ciotonea

et al. 2020

Applied Catalysis A: General

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Copper is a base metal active in hydrogenation reactions, but it is difficult to disperse on mesostructured supports by conventional methods, with adverse consequences on the catalytic properties. Incorporating aluminium into ordered mesoporous SBA-15 silicas via a simple two-step pH-adjustment route allows solving the Cu dispersion and activity problems jointly. The incorporation of 20 wt.% Al2O3 in the SBA-15 host structure leads to an increase of the copper metallic surface area by a factor 6 compared to the pure siliceous SBA-15-supported catalyst. The support also displays a high stability upon exposure to aqueous solutions, such as the impregnation solution, unlike ordered mesoporous alumina. Besides, Al introduction provides Lewis-acidic sites that favour the transformation of cinnamaldehyde into cinnamyl alcohol. As a consequence, the catalytic activity of materials prepared following this route is enhanced compared to a silica-supported system, while the chemoselectivity towards the unsaturated alcohol appears to be similar to that of a mesoporous alumina-supported system.

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“…The preparation procedure is influenced by low interactions between metallic reactor surfaces and catalyst slurries [4]. Several coating techniques have been applied for microchannels such as chemical vapor deposition, anodic oxidation, sol-gel process, washcoating, and electro-deposition [5]. The wash-coating method is commonly used for this application [6].…”

Section: Introductionmentioning

confidence: 99%

Cu/ZnO/Al2O3/Cr2O3/CeO2 Catalyst for Hydrogen Production by Oxidative Methanol Reforming via Washcoat Catalyst Preparation in Microchannel Reactor

Lesmana

2017

Bull. Chem. React. Eng. Catal.

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The oxidative methanol reforming reaction was carried out using Cu/ZnO/Al2O3/Cr2O3/CeO2 (15/15/2.5/1.25/1.25 mol%), with washcoat by EC sol on microchannel reactor. The experimental conditions were used various sol for washcoat of catalyst, various method for calcinations of catalyst, steam to methanol mole ratio, the mole ratio of oxygen to methanol, weight hourly space velocity, reaction temperature. The experiment result shows that methanol conversion achieved 98.8 % and carbon monoxide concentration equal to 1204 ppm when using Cu/ZnO/Al2O3/Cr2O3/CeO2 (15/15/2.5/1.25/1.25 mol%) catalyst mixed with EC sol at the reaction temperature of 200 o C.

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Synthesis and characterization of CuO/ZnO–Al2O3 catalyst washcoat thin films with ZrO2 sols for steam reforming of methanol in a microreactor

Cited by 9 publications

References 29 publications

Washcoat Deposition of Ni- and Co-ZrO2 Low Surface Area Powders onto Ceramic Open-Cell Foams: Influence of Slurry Formulation and Rheology

Washcoat Deposition of Ni- and Co-ZrO2 Low Surface Area Powders onto Ceramic Open-Cell Foams: Influence of Slurry Formulation and Rheology

Enhancement of the dispersion and catalytic performances of copper in the hydrogenation of cinnamaldehyde by incorporation of aluminium into mesoporous SBA-15 silica

Cu/ZnO/Al2O3/Cr2O3/CeO2 Catalyst for Hydrogen Production by Oxidative Methanol Reforming via Washcoat Catalyst Preparation in Microchannel Reactor

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