Buscar
Mostrando ítems 11-20 de 567
Alumina-catalyzed epoxidation with hydrogen peroxide: Recycling experiments and activity of sol-gel alumina
(Wiley-v C H Verlag GmbhWeinheimAlemanha, 2002)
Produção de catalisadores a base de zinco a partir de pilhas exauridas para tratamento de poluentes orgânicos em solução aquosa
(Universidade Tecnológica Federal do ParanáFrancisco BeltraoBrasilEngenharia QuímicaUTFPR, 2019-11-26)
In the present work, it was studied the production of catalysts from exhausted zinc / carbon cells, being applied in the process of degradation of textile organic dyes in aqueous solutions. For the synthesis of catalyst ...
Sulfated Zirconia: An Efficient and Reusable Heterogeneous Catalyst in the Friedel–Crafts Acylation Reaction of 3-Methylindole
(Springer, 2017-01)
An efficient process for the Friedel?Crafts acylation of 3-methylindole with acid anhydrides in the presence of sulfated zirconia was developed. This catalyst shows excellent catalytic activity with good conversion and ...
Copper mesoporous materials as highly efficient recyclable catalysts for the reduction of 4-nitrophenol in aqueous media
(Pergamon-Elsevier Science Ltd, 2018-08-09)
Two mesoporous-based catalysts with different nominal copper loads (10 and 24% w/w) were prepared from impregnation of the MCM-41 support with copper acetylacetonate: Cu/MCM-41-10 and Cu/MCM-41-24, respectively. Samples ...
p-Sulfonic acid calix[n]arenes as homogeneous and recyclable organocatalysts for esterification reactions
(Tetrahedron Letters, 2018)
Methanol synthesis from CO2/H2 using Ga2O3-Pd/SiO2 catalysts: Impact of reaction products
(Elsevier Science, 2008-12)
The synthesis of CH3OH from CO2/H2 mixtures using Ga2O3–Pd/SiO2 promoted catalysts is strongly affected by the reaction products. At finite conversion, important amounts of water and carbon monoxide are also found in the ...
Preparation and physicochemical characterization of biodiesel from recycled vegetable oil in Cuenca, Ecuador by transesterification catalyzed by kOH and naOH.
(2023)
Due to the environmental impact of using fossil fuels, alternatives for the generation of biofuels are being studied. An option for this problem is to obtain biodiesel from recycled vegetable oil. Studies show that basic ...
Recuperação de metais do grupo da platina a partir de catalisadores automotivos desativados
(Universidade Tecnológica Federal do ParanáLondrinaBrasilEngenharia ambientalUTFPR, 2017-11-22)
The platinum group metals (PGM) are largely applied in several industrial cantles, mainly in the fields of electronical components, electrodepositions, catalysts and fine chemistry. However, they are materials that are not ...
Sulfonated porous carbon catalysts for biodiesel production: Clear effect of the carbon particle size on the catalyst synthesis and properties
(Elsevier Science, 2016-08)
Sulfonated porous carbons (PCs-SO3H) are prepared by the sol-gel reaction of resorcinol and formaldehyde. The porosity is maintained during drying using a cationic polyelectrolyte as pore stabilizer. It was found that ...
Pyrolysis of polyolefins for increasing the yield of monomers' recovery
(Pergamon-elsevier Science LtdOxfordInglaterra, 2012)