Showing papers in "Catalysis Communications in 2007"

TL;DR: In this paper, the performance of transesterification of soybean oil to biodiesel using SrO as a solid base catalyst was studied and the reaction mechanism was proposed and the separate effects of reaction temperature, molar ratio of methanol to oil, mass ratio of catalyst to oil and repeated experiments were investigated.

TL;DR: A dye-sensitized CuO incorporated TiO 2 catalyst was found to be an active photocatalyst for the photocatalytic hydrogen production from water under visible light (> 420nm) irradiation in the presence of electron donors such as triethanolamine, acetonitrile and triethylamine as mentioned in this paper.

TL;DR: In this article, supported heteropoly acids were used as a catalyst for the dehydration of glycerol to produce acrolein and the catalytic activity depended on the types of heteropoly acid and on the size of the mesopores in the silica support.

TL;DR: In this article, an unsupported manganese oxide catalysts with amorphous phase were prepared by three methods, and their activities for SCR of NOx with ammonia were investigated in the presence of O2.

TL;DR: In this article, an ion exchange method was used to synthesize the biodiesel (fatty acid methyl esters, FAME), which was applied as the ion exchange precursor to incorporate La ion into zeolite beta.

TL;DR: In this paper, the effect of La loading on the photocatalytic activity of La-doped ZnO in the degradation of 2,4,6-trichlorophenol (TCP) was studied.

TL;DR: A silica-supported ionic liquid proved to be an efficient heterogeneous catalyst for solventless synthesis of cyclic carbonates from epoxides and carbon dioxide under supercritical conditions, which requires no additional organic solvents either for the reaction or for the separation of product.

TL;DR: In this paper, two different precursors, manganese nitrate (MN) and MANGANESE acetate (MA), were used to obtain different surface Mn atom concentrations indicated by XPS and NH3 adsorption.

TL;DR: In this paper, a photocatalyst system for the conversion of solar energy to electric energy or chemical energy is a topic of great interest with fundamental and practical importance, which is developed for photoreduction of carbon dioxide with water, and the effects of the NiO cocatalyst and pretreatment process on the photocatalytic reduction of the catalyst to methanol were investigated.

TL;DR: An efficient green protocol for the preparation of amidoalkyl naphthols, employing a three-component one-pot condensation reaction of β-naphthol, aromatic aldehyde, amides or urea in the presence of montmorillonite K10 clay under solvent free conditions has been described as discussed by the authors.

TL;DR: The mixture of catalytically active ionic liquid, 1-methyl-3-(2-aminoethyl)imidazolium hexafluophosphate, and water has been found to be an environmentally friendly and recyclable reaction medium in the synthesis of 4H-pyrans derivatives under computer-controlled microwave irradiation as discussed by the authors.

TL;DR: Tetra-methyl ammonium hydroxide has been used as a mild, efficient, neutral and cheap catalyst for the synthesis of various 4H-benzo[b]pyran derivatives via a one-pot three-component condensation in aqueous media as mentioned in this paper.

TL;DR: In this paper, a new Ni/MgO-CaO (based on dolomite) catalyst was investigated using a simulated gas containing naphthalene as tar.

TL;DR: In this paper, a K/γ-Al 2 O 3 catalyst was used in the transesterification of sunflower oil with methanol, achieving a methyl ester yield close to 100% after 1h.

TL;DR: Cupric sulfate pentahydrate is an efficient catalyst for a one-pot synthesis of quinoxaline derivatives and can be performed in water as well as ethanol.

TL;DR: An efficient and direct procedure for the preparation of amidoalkyl naphthols by a one-pot condensation of aryl aldehydes, β-naphthol and urea or amides, in the presence of potassium dodecatungstocobaltate trihydrate [K5CoW12O40·−3H2O, (1.mol%)] as a heterogeneous catalyst was developed in this article.

TL;DR: Alkyl and aryl sulfides are oxidized to the corresponding sulfoxides or sulfones in excellent yields with aqueous hydrogen peroxide in the presence of silica sulfuric acid as an efficient solid acid catalyst as discussed by the authors.

TL;DR: In this paper, 1,8-Dioxo-octahydroxanthenes have been synthesized from 5,5-dimethyl-1,3-cyclohexanedione and aromatic aldehydes using silica supported sodium hydrogen sulfate (NaHSO 4 ǫ·SiO 2 ) or silica chloride as a heterogeneous catalyst.

TL;DR: In this paper, the same catalyst has been used for the deprotection of carbonyl compounds under microwave irradiation, as well as for transthioacetalization.

TL;DR: In this paper, the Pt/C catalyst shows high catalytic activity due to the large BET surface area of active carbon support, and the effects of Pt loading and calcination temperature on the performance of the Pt catalyst were investigated.

TL;DR: In this article, α-Amylase was immobilized on zirconia via adsorption, and the support and the immobilized enzymes were characterized using XRD, IR spectra and N2 adaption studies.

TL;DR: Fe3+-montmorillonite was first used as a solid acidic catalyst for the synthesis of xanthenedione derivatives through condensation reactions between aromatic aldehydes and dimedone as discussed by the authors.

TL;DR: In this paper, the performance of Ni/CeO 2 /Al 2 O 3 catalysts prepared by a co-impregnation method was investigated in steam gasification of biomass in terms of the yield of coke and tar.

TL;DR: In this paper, the recycling of catalysts with no loss in their potency was proposed, allowing the reuse of these catalysts for one-pot synthesis of 1,4-dihydropyridines via solvent-free Hantzsch reaction.

TL;DR: Gold nanoclusters supported on γ-Al2O3 were more active and selective than platinum nanclusters in the high-pressure liquid-phase hydrogenation of cinnamaldehyde to cinnamic acid, while platinum was less active than gold.

TL;DR: Mesoporous TS-1, with additional mesopore system formed by packing the TS 1 nanocrystals, was synthesized by nanocasting route using nanoporous carbon (CMK-3) as template and characterized by XRD, BET, TEM, UV-vis and FT-IR.

TL;DR: In this article, the effect of Fe-Al2O3 interaction on the reduction/carburization behavior in H2/CO/syngas, surface basicity and the change of phase structure were comparatively studied by means of H2 or CO temperature-programmed reduction (TPR), CO2 temperatureprogrammed desorption (TPD) and Mossbauer effect spectroscopy (MES).

TL;DR: In this paper, an expeditious and efficient route for the synthesis of benzimidazole derivatives by the reaction of o -phenylenediamines with orthoesters in the presence of Lewis acids was described.

TL;DR: In this article, an effective catalyst for the very fast synthesis of quinoxaline derivatives from the condensation of the o-phenylenediamines and 1,2-dicarbonyl compounds at room temperature in excellent yields was found.

TL;DR: In this paper, the photocatalyst nanometer TiO 2 /poly-(fluorene-co-thiophene) (PFT) was studied under GaI 3 lamp irradiation in the present research.