Potentiometric method for determining the number and relative strength of acid sites in colored catalysts

Cid, R.; Pecchi, Gina

doi:10.1016/s0166-9834(00)84340-7

Cited by 208 publications

(97 citation statements)

References 9 publications

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“…According to the criterion proposed in the literature [12], the CNT and Pd/CNT samples have very weak acid sites (E 0 < -100 mV), while the GO support has very strong acid sites (E 0 > 100 mV). However, the catalyst Pd/G displayed weak acid sites (0 < E 0 < -100 mV), this suggesting that it has lost the acidity of the parent GO support during the synthesis process, which might be due to the use of vacuum [16].…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Synthesis of palladium nanoparticles on carbon nanotubes and graphene for the chemoselective hydrogenation of para-chloronitrobenzene

Dongil

Pastor‐Pérez

Fierro

et al. 2016

Catalysis Communications

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We have studied the synthesis of palladium nanoparticles over carbon nanotubes (Pd/CNT) and graphene (Pd/G) and we have tested their catalytic performance in the liquid phase chemoselective hydrogenation of para-chloronitrobenzene at room temperature. The catalysts were characterized by N 2 adsorption/desorption isotherms, TEM, X-ray diffraction, infrared and X-ray photoelectron spectroscopy and ICP-OES.The palladium particle size on Pd/G (3.4 nm) and Pd/CNT (2.8 nm) was similar though the deposition was higher on Pd/G. Pd/CNT was more active which can be ascribed to the different surface area and electronic properties of the Pd nanoparticles over CNT, while the selectivity was 100% to the corresponding haloaniline over both catalysts and they were quite stable upon recycling.

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Section: Accepted M Manuscriptmentioning

confidence: 99%

Synthesis of palladium nanoparticles on carbon nanotubes and graphene for the chemoselective hydrogenation of para-chloronitrobenzene

Dongil

Pastor‐Pérez

Fierro

et al. 2016

Catalysis Communications

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“…The surface acidity was performed by potentiometric titration [16], adding 0.05 mL of a solution of butylamine in dissolution of 150 mg of sample in acetonitrile (0.1 mol / L -1 ) in constant agitation with a magnetic stirrer. The solution was agitated for 3h and then continuing the addition of 0.05 mL of butylamine in acetonitrile every 2 minutes until the potentiometric curve tends to a constant value of the potential.…”

Section: Characterization Of the Catalystsmentioning

confidence: 99%

“…For the calcined catalysts it is possible to observe that the acid strength increases with Mo loading up to 15 wt.%. According to the interpretation of the values of the initial electrode potential (E i, ) [16], the catalysts exhibited very strong acid sites. These strong acid sites can be attributed to Mo-OH terminal bonds from supported molybdenum oxide monomeric or polymeric species.…”

Section: Catalytic Testsmentioning

confidence: 99%

EFFECT OF MO CONTENT IN MO(X)/γ-AL2O3 CATALYSTS OVER THE CONVERSION OF 2-METHOXYPHENOL AS LIGNIN-DERIVATES COMPONENTS

Leiva¹,

Sepúlveda²,

Garcı́a³

et al. 2013

J. Chil. Chem. Soc.

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The effect of Mo loading (10, 12, 15, 17 and 20 wt.%) on the physicochemical properties and reactivities of Mo(x)/g-Al 2 O 3 sulfide catalysts for the conversion of 2-methoxyphenol at 573 K and 5 MPa of hydrogen pressure were studied. The catalysts were characterized by specific area (S BET ), electrophoretic migration (EM), X-ray photoelectron spectroscopy (XPS) and surface acidity techniques. The highest conversion observed for the catalyst with a Mo loading of 15 wt.% was attributed to an increase in the number of active sites due to highly dispersed Mo species. At higher Mo loadings, the formation of Mo aggregates led to lower guaiacol conversion. The differences in the phenol/catechol ratio were explained by the acid strengths of the sulfided catalysts.

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“…The surface acidity of the materials was measured by potentiometric titration 17 . An amount of 100-150 mg of support sample with 100 mL of pure acetonitrile was mixed with 0.05 mL of titration solution, 0.05N butylamine in acetonitrile.…”

Section: Characterisation Of the Adsorbentsmentioning

confidence: 99%

Development of an Analytical Method for the Main Organic Compounds Derived From Thermochemical Conversion of Biomass

Tessini

Romero²,

Escobar³

et al. 2016

J. Chil. Chem. Soc.

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The removal of 4-Nitrophenol (4-NP) from aqueous media by adsorption is studied in a batch system using different porous materials: activated carbon, zirconia, alumina, sepiolite, natural zeolite and 13X zeolite. Depending on their adsorption capacities, the best adsorbent was chosen to be impregnated with different levels of nickel (Ni) in order to study the adsorption by π-complexation in batch and continuous systems. The samples of Ni(x)/support (x= 2, 4, 6%) were prepared by wet impregnation and were characterised using the same method as with all the materials, by N 2 adsorption-desorption using the BET method, surface acidity and Z potential measurements by electrophoretic migration. The samples were measured in a UV-Vis electrophotometer at a wavelength of 318 nm, while the adsorption capacity of the material in the batch system was determined by calculating the difference in concentration once the adsorbent became saturated after an initial concentration of ~20 ppm, and in the continuous system this was done by integrating the area under the adsorption curve. The results suggest that adsorption capacity depends on the specific BET area, apparent acid strength and the IEP of each support, and that it varies with the addition of Ni.

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Potentiometric method for determining the number and relative strength of acid sites in colored catalysts

Cited by 208 publications

References 9 publications

Synthesis of palladium nanoparticles on carbon nanotubes and graphene for the chemoselective hydrogenation of para-chloronitrobenzene

Synthesis of palladium nanoparticles on carbon nanotubes and graphene for the chemoselective hydrogenation of para-chloronitrobenzene

EFFECT OF MO CONTENT IN MO(X)/γ-AL2O3 CATALYSTS OVER THE CONVERSION OF 2-METHOXYPHENOL AS LIGNIN-DERIVATES COMPONENTS

Development of an Analytical Method for the Main Organic Compounds Derived From Thermochemical Conversion of Biomass

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Potentiometric method for determining the number and relative strength of acid sites in colored catalysts

Cited by 208 publications

References 9 publications

Synthesis of palladium nanoparticles on carbon nanotubes and graphene for the chemoselective hydrogenation of para-chloronitrobenzene

Synthesis of palladium nanoparticles on carbon nanotubes and graphene for the chemoselective hydrogenation of para-chloronitrobenzene

EFFECT OF MO CONTENT IN MO(X)/&#947;-AL2O3 CATALYSTS OVER THE CONVERSION OF 2-METHOXYPHENOL AS LIGNIN-DERIVATES COMPONENTS

Development of an Analytical Method for the Main Organic Compounds Derived From Thermochemical Conversion of Biomass

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Product

Resources

About

EFFECT OF MO CONTENT IN MO(X)/γ-AL2O3 CATALYSTS OVER THE CONVERSION OF 2-METHOXYPHENOL AS LIGNIN-DERIVATES COMPONENTS