Hydrogen production by steam reforming of ethanol over Co3O4/La2O3/CeO2 catalysts synthesized by one-step polymerization method

Carvalho, Flávio L.S.; Asencios, Yvan J.O.; Rego, A.M. Botelho do; Assaf, Elisabete Moreira

doi:10.1016/j.apcata.2014.06.027

Cited by 40 publications

(17 citation statements)

References 89 publications

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“…However, by the addition of second metal oxide, the specific diffraction peaks of La 2 O 3 had nearly vanished and the whole diffraction peaks of LCDSHs shift to smaller angle, implying that La 2 O 3 were replaced by the distinctive peaks for the lattice planes of crystalline Ce. As reported, the La atoms were substituted by Ce atoms with smaller ionic radius [r (Ce 4+ ) = 0.097 nm, r (La 3+ ) = 0.106 nm)]in a solid solution . After Pt NPs were impregnated into DSHs, the product Pt‐CDSHs displayed the characteristic diffraction peaks located at 2θ = 39.6° (Figure d) indexing as the (111) lattice patterns of platinum (JCPDS, 04–0802).…”

Section: Resultsmentioning

confidence: 79%

Highly active catalysts: Double‐shelled hollow nanospheres with tiny Pt NPs

Yao

Gao

Yang

et al. 2019

Applied Organom Chemis

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A facile strategy was reported to fabricate a novel Pt‐based metal oxide double‐shelled hollow nanospheres (MDSHs), which avoided the traditional tedious procedures. It was attractive that the formation mechanism of DSHs involved redeposition of etch‐released silica species and self‐assembly of metal oxide units. To verify the successful synthesis and structure features of Pt‐LCDSHs catalyst, the as‐prepared samples were characterized by several techniques, such as SEM, N2 adsorption–desorption isotherm analysis, TEM, EDX, XRD and XPS. Results indicated that all of MDSHs possessed double‐shelled structures with both the inner and outer shells composing of metal oxide units. Interestingly, the metal oxide of the DHSs could offer abundant active points for Pt NPs and the space between the double shells also could be filled with Pt NPs. What's more, compared with the pure samples, the Pt‐embedded La2O3‐CeO2‐DSHs exhibited the highest catalytic performance (6.58 × 10−3 min−1) and good reusability with a conversion of 94% even after eight cycles, which were evaluated by means of the reduction of 4‐nitrophenol monitored by UV–vis spectra. Finally, a possible reaction mechanism for the reduction reaction on Pt‐based La2O3‐CeO2‐DSHs was also proposed.

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Section: Resultsmentioning

confidence: 79%

Highly active catalysts: Double‐shelled hollow nanospheres with tiny Pt NPs

Yao

Gao

Yang

et al. 2019

Applied Organom Chemis

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“…5, the peaks located at 220-370°C could be decomposed into two components for the Pt/Co 3 O 4 -PP-X (X = 250, 350, 550) catalyst. Therefore, two reduction components may appear over the Co-based catalyst in the H 2 -TPR patterns [29][30][31]. The first component at the lower temperature is assigned to the reduction of Co 3?…”

Section: Surface Component and Reducibilitymentioning

confidence: 99%

Tricobalt tetraoxide-supported palladium catalyst derived from metal organic frameworks for complete benzene oxidation

Liu

et al. 2016

Catal Lett

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The structure and the chemical state of the metal oxide support have significant effect on the activity of noble metal nanoparticles for the catalytic oxidation of organic pollutants. In this work, we report the synthesis of porous tricobalt tetraoxide-supported palladium (Pd/ Co 3 O 4 ) catalysts derived from direct pyrolysis of metalorganic framework (MOF) for the complete oxidation of benzene. The porosity and nanoparticle size of the catalyst could be controlled by adjusting the calcination temperature. The X-ray photoelectron spectroscopy (XPS) analyses reveal that the surface adsorbed oxygen, which is associated with the PdO x species, is crucial for catalytic performance. H 2 -temperature programmed reduction (H 2 -TPR) results indicate that the reducibility of the catalyst has significant effect on the catalytic activity for the oxidation of benzene. In general, Pd nanoparticles supported on the porous polyhedron Co 3 O 4 support calcined at 350°C (Co 3 O 4 -PP-350), which possess abundant porous structures and the most active surface adsorbed oxygen, exhibit the highest activity for the complete catalytic conversion of benzene compared with those supported on the porous polyhedron Co 3 O 4 support calcined at 250°C (Co 3 O 4 -PP-250), 550°C (Co 3 O 4 -PP-550), and the Co 3 O 4 nanoparticle support calcined at 350°C (Co 3 O 4 -NP-350). Graphical Abstract 0 50 100 150 200 250 0 20 40 60 80 100 Temperature (°C) Benzene conversion (%) 2 m Pd/Co3O4-PP-350 Pd/Co3O4-PP-550 Pd/Co3O4-PP-250 Benzene CO 2 + H 2 O 2 m 2 m

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“…The absorption seen at ~3417 cm -1 is thought to be due to the symmetric vibration of the -OH groups of the absorbed H 2 O molecules. 31 32,33 The surface morphology of La 2 O 3 /Co 3 O 4 nanocomposite was examined via SEM image (Fig. 1c)…”

Section: Morphology and Structure Of La 2 O 3 /Co 3 O 4 Nanocompositementioning

confidence: 99%

La2O3/Co3O4 nanocomposite modified screen printed electrode for voltammetric determination of sertraline

Mohammadi

Beitollahi

Rohani

et al. 2020

JSCS

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La 2 O 3 /Co 3 O 4 nanocomposite was synthesized and then used for the modification of screen-printed electrode (SPE) prior to the electrochemical determination of sertraline. A significant increment in peak current response was observed and peak potential also shifted towards less positive potentials showing the facilitated oxidation procedure at surface of modified SPE (La 2 O 3 / /Co 3 O 4 /SPE). The quantitative determination of sertraline was carried out by using different pulse voltammetry and the anodic peak current was found to increase with increasing sertraline concentration in the linear range of 5.0-400.0 µM with limit of detection as 1.0 μM. The prepared La 2 O 3 /Co 3 O 4 /SPE has been successfully used for detecting sertraline in sertraline tablet and urine samples with excellent recoveries.

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Hydrogen production by steam reforming of ethanol over Co3O4/La2O3/CeO2 catalysts synthesized by one-step polymerization method

Cited by 40 publications

References 89 publications

Highly active catalysts: Double‐shelled hollow nanospheres with tiny Pt NPs

Highly active catalysts: Double‐shelled hollow nanospheres with tiny Pt NPs

Tricobalt tetraoxide-supported palladium catalyst derived from metal organic frameworks for complete benzene oxidation

La2O3/Co3O4 nanocomposite modified screen printed electrode for voltammetric determination of sertraline

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