Authors:G. Boskovic, A. Zarubica, M. Kovacevic, and P. Putanov
Properties of two catalysts tailored in the laboratory conditions by sulfation of commercial Zr-hydroxide and Zr-hydroxide
of nitrate origin were compared with those of commercial SO4-Zr-hydroxide. Equally thermally treated samples in the temperature interval 500–700°C, and having the same amount of sulfur,
show different properties indicating memory effect of their solid parent materials. The catalyst obtained by sulfation of
commercial Zr-hydroxide differs in amount of residual sulfates upon calcination from other two catalysts. The instability
of sulfates in the previous case might be connected to the lowest surface area values of catalyst and the highest fraction
of monoclinic phase observed at all applied calcination temperatures.
Authors:R. Marinkovic-Neducin, E. Kiss, T. Cukic, and D. Obadovic
The purified bentonite parent clay, fraction ≤; 2 mm of montmorillonite type, has been pillared by various polyhydroxy cations,
Al, AlFe and AlCu, using conventional pillaring methods. The thermal behavior of PILCs was investigated by combination of
X-ray diffraction (XRD), thermal analysis (DTA, TG) and low temperature N2 adsorption/desorption (LTNA). Thermal stability
of Al-, AlFe- and AlCu-PILC samples was estimated after isothermal pretreatment in static air on the temperatures 300, 500,
600 and 900C. Crucial structural changes were not registered up to 600C, but the fine changes in interlayer surrounding
and porous/microporous structure being obvious at lower temperatures, depending on the nature of the second pillaring ion.
AlFe-PILC showed higher thermal stability of the texture, the AlCu-PILC having lower values and lower thermal stability concerning
both overall texture and micropore surface and volume. Poorer thermal stability of AlCu-PILC sample at higher temperatures
was confirmed, the presence of Cu in the system contributing to complete destruction of aluminum silicate structure, by 'extracting'
aluminum in stabile spinel form.
Authors:Anikó Kovács, Katalin Badakné Kerti, and László Somogyi
confectionary systems. Here, we investigated differences in the textureproperties, the viscosity and thermal properties of the blends. Materials and methods Commercial sugar (sucrose), stevia and xylitol were used in this study. Palm oil was purchased from
Authors:Cleanio L. Lima, Hélvio S. A. de Sousa, Santiago J. S. Vasconcelos, Josué M. Filho, Alcemira C. Oliveira, Francisco F. de Sousa, and Alcineia C. Oliveira
by the Raman results. This fact limits the selectivity to acrolein and hydroxyacetone due to the heavy compound formation. In addition, the characteristics of the sulfated AlSBA-15 molecular sieve in terms of acidity, texturalproperties and
Authors:C. Amairia, S. Fessi, A. Ghorbel, and A. Rîves
different precursors with a zirconium loading of 2% (w/w) and palladium loading of 0.5% (w/w). One of the routes employed in this work is the sol-gel method, known as a route that provides the possibility to control the texturalproperties of materials. In
Authors:Luca Serventi, Joseph Sachleben, and Yael Vodovotz
heating. Microwaved doughs’ exterior remains tough while the interior is hard and chewy [ 2 ]. These and other deleterious texturalproperties have been discussed elsewhere [ 3 – 7 ].
Par-baking the dough prior to reheating improves bread quality
Authors:Valeria Palermo, Ángel G. Sathicq, Patricia G. Vázquez, Horacio J. Thomas, and Gustavo P. Romanelli
adsorption technique. These catalysts were well characterized by means of 31 P-NMR, UV–visible spectra, FT-IR spectra, thermal analysis, and texturalproperties. Mo, V and Bi amounts were estimated by ICP-AES analysis.
Authors:Alejandro López-Gaona, José De los Reyes, Julia Aguilar, and Nancy Martín
Pt/MCM, Pt/SiO2, Pd/MCM and Pd/SiO2 were prepared and characterized by H2-TPR, TEM, 29Si-CP-MAS-NMR, DRS-UV-Vis and tested in the hydrodechlorination of 1,2-dichloroethane. Differences in the catalytic behavior
were related with textural properties.
Authors:A. Oliveira, G. Marchetti, and M. Carmo Rangel
The effect of the iron precursor on the thermal decomposition of iron oxyhydroxides was studied by DSC, DTA and TG in this
work. Samples were prepared from iron nitrate, iron sulfate and iron chloride and the thermal curves obtained were analyzed
by specific area measurements, X-ray diffraction and Mssbauer spectroscopy. It was found that the iron oxyhydroxide precursors
affect the temperatures of the hematite formation as well as the textural properties of the final hematite producing particles
with different diameters as following: iron sulfate (3.3 nm)<iron nitrate (15 nm)<iron chloride (24 nm).
Authors:B. Dragoi, V. Rakic, E. Dumitriu, and A. Auroux
This work is focused on the gas and liquid-phase adsorption of pollutants: propanol, 2-butanone, phenol and nicotine onto
zeolites (H-BETA, H-ZSM-5, H-MCM-22, and clinoptilolite). Textural properties and origin of zeolites were taken into account
as criteria of adsorbents selection. The aldehyde and the ketone were adsorbed in the gas phase using microcalorimetry linked
to a volumetric line to evaluate adsorption. Adsorptions in water were carried out for phenol and nicotine and the evolved
heats during adsorption were measured by a differential heat flow reaction calorimeter with stirring. Results are discussed
in relation with the pore sizes and various interactions which could occur between the adsorbent and the adsorbate.