Heterogeneous catalyst
New heterogeneous catalyst for the esterification of fatty acid produced by surface aromatizationsulfonation of oilseed cake
... active heterogeneous catalyst from oilseed cake, a biodiesel ...acid catalyst can be produced by the direct reaction of the cake with sulfuric acid according to the simplified scheme shown in ...
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Cobalt-catalyzed oxidation of terpenes: Co-MCM-41 as an efficient shape-selective heterogeneous catalyst for aerobic oxidation of isolongifolene under solvent-free conditions
... sol–gel occurs smoothly at 80 °C resulting in a 46% conversion in 24 h (Table 2, run 2). Keeping the mixture under stirring for more time does not result in the further conversion of the substrate. On the other hand, ...
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Modified montmorillonite as a heterogeneous catalyst in (m)ethyl esterification reaction of lauric acid.
... O efeito apresentado pela variável razão molar foi de -6,69 pon- tos percentuais, em que se veriica um efeito negativo no aumento desta variável, pois aumentando-se a razão molar de 6:1[r] ...
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J. Braz. Chem. Soc. vol.27 número11
... of heterogeneous catalytic systems for olefin ...on heterogeneous polymerization involving mesoporous supports such as MCM-41 and SBA- 15 have been ...The catalyst immobilization on mesoporous ...
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Efficient one-pot synthesis of 14-aryl-14H-dibenzo [a,j]xanthene derivatives promoted by niobium pentachloride
... Hunnur, R. K., Sunilkumar, B., Kumar, P. S., Srinivasulu, N., Udupi, R. H., & Bindu, V. H. (2008). Silica sulfuric acid: A simple, efficient and reusable heterogeneous catalyst for the one-pot synthesis ...
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Degradation of 17α-methyltestosterone by hydroxyapatite catalyst
... Fish farming is becoming a highly profitable economic activity and the rearing of fingerlings involves the practice of sex reversal for the production of species (male) using the hormone 17α- methyltestosterone (MT). ...
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J. Braz. Chem. Soc. vol.20 número7
... Jacobsen catalyst. This new heterogenised catalyst was active in the enantioselective epoxidation of styrene, α-Me- styrene and 6-CN-chromene, using three different oxidant ...
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J. Braz. Chem. Soc. vol.21 número8
... eficient heterogeneous catalyst for the synthesis of β-enamino ketones and esters by the enamination of various primary and secondary amines with β-dicarbonyl compounds under solvent-free ...the ...
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J. Braz. Chem. Soc. vol.27 número12
... magnetic heterogeneous catalyst for the production of FAME biodiesel was successfully prepared by using an amorphous silica as a support, KI as the chemically active catalyst component, and ...
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Quím. Nova vol.39 número8
... The sulfonic acid functionalized LUS-1 (0.02 g) was activated in vacuum at 100 °C and then after cooling to room temperature, aromatic aldehyde 1 (1 mmol), malononitrile 2 (1 mmol) and gua- nidine carbonate 3 (0.5 mmol) ...
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J. Braz. Chem. Soc. vol.27 número6
... In this work, a novel HPM-based complex was prepared by the modification of HPM with HPI, and the complex was applied in esterification reaction as heterogeneous catalyst to evaluate its acid-catalytic ...
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Braz. J. Chem. Eng. vol.34 número1
... Many researches have indicated that chemical leaching (employing inorganic and organic acids) and bioleaching are promising alternatives for the re- covery of metals (Asghari et al., 2013; Jadhav and Hocheng, 2012; ...
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J. Braz. Chem. Soc. vol.25 número1
... For this transesterification reaction, glycerol (18.40 g, 0.2 mol), DMC (54.0 g, 0.6 mol) and the catalyst (4 wt.% of glycerol) were added into a three-neck round-bottom flask equipped with a mechanical stirring ...
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Carbon nanofibers a new catalyst support for hydrazine decomposition.
... NEW CATALYST SUPPORT FOR HYDRAZINE ...the catalyst should support high pressure and temperature variations within a short time ...commercial catalyst are jeopardized by the low thermal conductivity ...
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Effect Of High Free Fatty Acid Feedstock On Methyl Esters Yield Using Bulk Calcium Oxide Catalyst
... There was a complete conversion of feedstock that had 0.22% acid value to methyl esters. But as the acid value increases the methyl esters yield decreases as shown in Fig. 1 and the acid content of the biodiesel products ...
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Reduction kinetics of A CuO/ZnO/Al2O3 catalyst.
... Os resultados de redução isotérmica demonstraram que a cinética de redução é melhor descrita pelo modelo do crescimento isotrópico do cristal para as duas espécies de Cu 2+. As energias [r] ...
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Efficient filtration system for paraffin-catalyst slurry separation
... Effect of differential pressure on the quality of filtrate Figure 6 is a high resolution SEM micrograph, taken from the filtrate part, of an alumina particle that was produced in the refinery paraffin slurry due to ...
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J. Braz. Chem. Soc. vol.28 número2
... palm oil and methanol. The yields obtained are plotted in Figure 6. The catalysts synthesized at 1000 ºC for two and three hours (W1 and W2) did not show enough activity. The catalyst W3 showed a yield of 41%, ...
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Transesterification of Palm Oil for the Production of Biodiesel
... Acid catalyst transesterification is the second conventional way of making the ...acid catalyst (Shigeki et ...of catalyst gives very high yield in esters but the reaction is very slow, requiring ...
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J. Braz. Chem. Soc. vol.16 número6A
... The morphology of the polymer blends was investigated using scanning electron microscopy (SEM). SEM micrographs made on cryo-fractured surfaces of the polyethylene blend samples produced at 30 and 50 °C using x Ni = 0.25 ...
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