The aim of this work is to report the performance of different supports for the immobilization of commercial porcine pancreatic lipase. The immobilization tests were carried out in several types of Accurel, activated alumina, kaolin, montmorillonite, ion exchange resins and zeolites. The characterization of the supports showed differences in terms of specific area and morphology. The characteristics of the supports influenced the amount of enzyme adsorbed, yield of immobilization and esterifi...

The degradation of dyes (methylene blue, direct blue 71, direct yellow 8) by a series of titania-supported catalysts generated in situ via the impregnation of TiCl4 onto a series of zeolite, which was synthesized using rice husks as the silicon source, was individually evaluated. After calcination, the resulting supported catalysts were characterized by X-ray diffraction spectrometry, ultraviolet–visible diffuse reflectance spectroscopy, diffuse reflectance and transmittance infrared Fourier ...

Catalyst particle size is an important parameter in the polymer industry. A series of supports with different textural properties (silicas prepared by different routes), surface sites (alumino-silicate, silica-zirconia, magnesia-silica supports, and methylaluminoxane-modified silica) and crystallinity (amorphous, lamellar, and crystalline materials) were investigated in the sequential grafting reaction of two metallocene catalysts, Cp2ZrCl2 and (n-BuCp)2ZrCl2, in a 1:3 ratio. The catalyst sys...

The aim of this study was to characterize Pd catalysts supported on three different mordenite zeolites (a commercial sample and two laboratory preparations) previously tested for the NO decomposition reaction. H2 chemisorption, TPR, FTIR spectroscopy of adsorbed CO and NO, DRS UV–vis and TPD of NO were used to characterize the catalysts. After reduction at 573 K a large fraction of Pdo particles and some Pd2+ ions were found in the commercial sample and one laboratory preparation. In contrast...