Gold, palladium and gold–palladium supported on silica catalysts prepared by sol–gel method: synthesis, characterization and catalytic behavior in the ethanol steam reforming

Silva, Anderson G. M. da; Robles-Dutenhefner, Patrícia A.; Dias, Anderson; Fajardo, Humberto V.; Lovón, Adriana S.P.; Lovón-Quintana, Juan J.; Valença, Gustavo Paim

doi:10.1007/s10971-013-3076-8

Cited by 19 publications

(16 citation statements)

References 41 publications

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“…Small amounts of methane and carbon monoxide detected in the reaction effluent, indicating that acetaldehyde decomposition to CO and CH 4 (CH 3 CHO → CH 4 + CO) occurred to a minor extent. These results show the role of Au (in Ausupported catalysts for ethanol steam reforming) in mainly catalyzing ethanol dehydrogenation [20,43]. Besides, the presence of ethylene in the product stream…”

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confidence: 68%

“…[3,[8][9][10][13][14][15][16] Common catalyst supports include activated carbon, silica, alumina and, to a lesser extent, polymers and zeolites. [17][18][19][20][21] Ordered mesoporous silicas, such as MCM-41, SBA-15 and HMS, have been shown to be suitable catalyst supports. [22] These mesoporous materials possess some important properties for catalytic purposes, such as high BET surface areas, large pore volumes and highly ordered pore structures with narrow pore size distributions in the range of 2-50 nm, depending on the precursor chemicals and synthetic conditions.…”

Section: Introductionmentioning

confidence: 99%

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Versatile and efficient catalysts for energy and environmental processes: Mesoporous silica containing Au, Pd and Au-Pd

Silva

Fajardo

Balzer

et al. 2015

Journal of Power Sources

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We described a versatile approach for the synthesis of Au/MCM-41, Pd/MCM-41 and Au-Pd/MCM-41 by the direct incorporation of the noble metals into the MCM-41 framework. The structural, textural and chemical properties were characterized by X-ray diffraction (XRD), temperature-programmed reduction (TPR), N 2 -adsorption (BET and BJH methods), H 2 -chemisorption, small angle X-ray scattering (SAXS), transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS). The nanomaterials, being comprised of Au, Pd and Au-Pd nanoparticles and possessing high surface areas were applied as versatile and efficient catalysts in benzene, toluene and o-xylene (BTX) oxidation and in the steam reforming of ethanol for hydrogen production. The results revealed that the catalytic behavior in both processes was influenced by the experimental conditions and the nature of the catalyst employed.The Au-Pd/MCM-41 catalyst was the most active in the BTX total oxidation. On the basis of characterization data, it was proposed that the close contact between Pd and Au and the higher dispersion of Pd may be responsible for the enhanced activity of the bimetallic catalyst. However, the strong interaction between the noble metals did not improve the performance of the bimetallic catalyst in ethanol steam reforming, the Pd/MCM-41 catalyst being the most active and selective for hydrogen production.

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confidence: 68%

Section: Introductionmentioning

confidence: 99%

Versatile and efficient catalysts for energy and environmental processes: Mesoporous silica containing Au, Pd and Au-Pd

Silva

Fajardo

Balzer

et al. 2015

Journal of Power Sources

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“…XRD studies confirmed the amorphous nature of Lip/Pd/MCF catalyst. The highly amorphous MCF showed a hump at 24.1° in the XRD spectra . The catalyst does not show a change in pattern in comparison with MCF, as a very low amount of palladium was impregnated on silica.…”

Section: Resultsmentioning

confidence: 99%

One‐pot synthesis of (R)‐1‐(pyridin‐4‐yl)ethyl acetate using tandem catalyst prepared by co‐immobilization of palladium and lipase on mesoporous foam: Optimization and kinetic modeling

Magadum

Yadav

2017

Chirality

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The synthesis of (R)-1-(pyridin-4-yl)ethyl acetate was achieved over tandem palladium-lipase catalyst with 100% selectivity using 4-acetyl pyridine as a reactant. The 2% w/w palladium and lipase catalyst was successfully co-immobilized in the microenvironment of the mesocellular foam and characterized by various techniques. The palladium metal from catalyst hydrogenated 4-acetyl pyridine to form 1-(pyridin-4-yl)ethanol. The generated intermediate product then underwent kinetic resolution over lipase and selectively gave (R)-1-(pyridin-4- yl)ethyl acetate. The catalytic conditions were then studied for optimal performance of both steps. The reaction conditions were optimized to 50 °C and toluene as a solvent. Both chemical and enzymatic kinetic models of the reaction were developed for a given set of reaction conditions and kinetic parameters were predicted. At optimal conditions, the obtained selectivity of intermediate (1-(pyridin-4-yl)ethanol) was 51.38%. The final product yield of ((R)-1-(pyridin-4-yl)ethyl acetate) was 48.62%.

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“…However, the double-reciprocal plot, i.e. 1/v 0 versus 1/[A] at the different concentrations of B, significantly distinct between a sequential or ping-pong mechanism [13,63,64].…”

Section: Enzyme Inhibitors and Activatorsmentioning

confidence: 97%

Kinetic Modelling of Enzyme Catalyzed Biotransformation Involving Activations and Inhibitions

Yadav¹,

Magadum²

2017

Enzyme Inhibitors and Activators

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To achieve transition from lab scale enzyme studies to industrial applications, understanding of enzyme kinetics plays a critical role. The widely applied Michaelis Menten equation of the single substrate kinetics, sequential and double replacement mechanism of bisubstrate reaction and the relevant kinetics, inhibition and activation of enzyme are all integral parts of this discussion. In this chapter, we have discussed different types of inhibition and kinetic modelling. Systematic approach to generate data and its interpretation as well as designing of inhibitors is also explained.

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Gold, palladium and gold–palladium supported on silica catalysts prepared by sol–gel method: synthesis, characterization and catalytic behavior in the ethanol steam reforming

Cited by 19 publications

References 41 publications

Versatile and efficient catalysts for energy and environmental processes: Mesoporous silica containing Au, Pd and Au-Pd

Versatile and efficient catalysts for energy and environmental processes: Mesoporous silica containing Au, Pd and Au-Pd

One‐pot synthesis of (R)‐1‐(pyridin‐4‐yl)ethyl acetate using tandem catalyst prepared by co‐immobilization of palladium and lipase on mesoporous foam: Optimization and kinetic modeling

Kinetic Modelling of Enzyme Catalyzed Biotransformation Involving Activations and Inhibitions

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