Nanosilica synthesized by the Pechini method for potential application as a catalytic support

Ribeiro, P.C.; Kiminami, R. H. G. A.; Costa, A.C.F.M.

doi:10.1016/j.ceramint.2013.07.115

Cited by 11 publications

(5 citation statements)

References 10 publications

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“…It is worth noting that high surface area supports are desirable for photocatalysis because it can promote the adsorption of the dye RhB to be degraded on the catalyst/support surface (21). Such behavior is in accordance with the results of Ribeiro et al (58) and Gaya and Abdullah (59), who reported that the performance of a photocatalyst is dependent on the surface textural characteristics (size, surface area, and pore volume) because the local morphology strongly influences the number of striking photons and the rate of the photocatalytic reaction.…”

Section: Zeta Potential (Zp) Measurementssupporting

confidence: 90%

Alternative Approaches in Development of Heterogeneous Titania-Based Photocatalyst

Ruiz¹,

Escobar²,

Silva³

et al. 2016

Semiconductor Photocatalysis - Materials, Mechanisms and Applications

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Three alternative approaches for the development of heterogeneous photocatalysts are comparatively evaluated, namely (i) the use of molecular imprinting concept for the development of heterogeneous catalysts employing rhodamine B as template and solgel as synthesis route; (ii) the impregnation of TiCl 4 on mixed nano-and micro-metric silicas, followed by calcination; (iii) the use of industrial and academic chemical residues as source of potential photocatalyst species impregnated on supports. All tests were carried on with rhodamine B as target molecule. For comparative reasons, photocatalytic tests were carried out with commercial titania (P25). The solids were characterized by nitrogen porosimetry, small-angle X-ray scattering (SAXS), zeta potential (ZP), diffuse reflectance spectroscopy in the ultraviolet region (DRS-UV), diffuse reflectance infrared Fourier transmission spectroscopy (DRIFTS), and Rutherford backscattering spectrometry (RBS). The supported catalysts resulting from silica nanoparticles and residue of the petrochemical industry achieved higher percentage of the dye degradation under ultraviolet (68.0 and 66.8%, respectively) radiation. The industrial waste reached the highest photocatalytic activity under visible (61%) radiation, while the commercial P25 achieved 82.0and 12.3% for ultraviolet and visible radiation, respectively. The textural and structural characteristics of the supported catalyst prepared with fumed silica and petrochemical waste (SiPe), namely the low-energy bandgap (1.8 eV), large surface area (280 m 2 g −1), high pore volume (1.9 cm 3 g −1), and high zeta potential value (−36.4 mV), may have been responsible for their high activity.

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Section: Zeta Potential (Zp) Measurementssupporting

confidence: 90%

Alternative Approaches in Development of Heterogeneous Titania-Based Photocatalyst

Ruiz¹,

Escobar²,

Silva³

et al. 2016

Semiconductor Photocatalysis - Materials, Mechanisms and Applications

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“…Так, использование метода Печини даёт следующие преимущества: простота приготовления, более высокая удельная площадь поверхности синтезированного материала, однородность поверхности катализатора, повышение активности и стабильности, возможность приготовления больших количеств катализатора. В работе [15]…”

Section: Syngas Production By Dry Reforming and Bi-reforming Of Metha...unclassified

SYNGAS PRODUCTION BY DRY REFORMING AND BI-REFORMING OF METHANE OVER SOL-GEL MADE Со-Rh/AL2O3 BIMETALLIC CATALYSTS

BOLEUBAYEV,

KOMEKBAYEVA,

ZHUMASH

et al. 2023

NiG

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The most important global challenge of concern for humanity is the change in the Earth's climate due to greenhouse gas (GHG) emissions. In this regard, carbon dioxide reforming of methane is once again attracting more attention as the process uses two major greenhouse gases - methane (CH4) and carbon dioxide (CO2) as feedstock. The reaction product of which is synthesis gas, which is the primary building block to produce various valuable products. Rapid catalyst deactivation due to coking makes industrial development of this process difficult. Additionally, the low H2/CO ratio in synthesis gas, usually below 1.0, limits its further utilization. To solve these issues, it is necessary to create new effective coking-resistant catalysts, improve their chemical and structural composition and preparation methods, and optimize the process conditions. In this work, 5%Co-Rh/Al2O3, a bimetallic catalyst prepared by the sol-gel method (modified Pechini method) was studied in the processes of carbon dioxide and combined steam-carbon dioxide reforming of methane. It was shown that 5%Co-Rh(98:2)/Al2O3 sol-gel catalyst had a high activity in the carbon dioxide reforming of methane. The introduction of steam into the initial CH4-CO2 feedstock allows the regulation of the composition of the produced synthesis gas depending on the amount of water. At t=8000 , the degree of methane conversion is 92.5-95.8%, carbon dioxide – 85.6-97.4%, and H2/CO ratio = 1.0-2.1 depending on the amount of steam added.

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“…[10][11][12][13] Owing to their high specific surface area and high ion-exchange capacity, mesoporous materials are beneficial for improving the dispersion of metal oxides, resulting in better catalytic activity and redox capacity, which are attributed to their special pore structures. 14,15 Among these materials, KIT-6 exhibits a special three-dimensional pore structure, demonstrating excellent adsorption-desorption capacities for different gases. [16][17][18] Thus, KIT-6 is an excellent option as a catalyst carrier to achieve high dispersion of metal oxides as well as high diffusion of reaction substrates.…”

Section: Introductionmentioning

confidence: 99%

The promotion effect of Sn on Cr/KIT-6 for the catalytic combustion of chlorobenzene

Liu

He³

2023

New J. Chem.

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Nanosilica synthesized by the Pechini method for potential application as a catalytic support

Cited by 11 publications

References 10 publications

Alternative Approaches in Development of Heterogeneous Titania-Based Photocatalyst

Alternative Approaches in Development of Heterogeneous Titania-Based Photocatalyst

SYNGAS PRODUCTION BY DRY REFORMING AND BI-REFORMING OF METHANE OVER SOL-GEL MADE Со-Rh/AL2O3 BIMETALLIC CATALYSTS

The promotion effect of Sn on Cr/KIT-6 for the catalytic combustion of chlorobenzene

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