Showing papers in "Catalysis Today in 2005"

TL;DR: In this paper, the transesterification reaction of vegetable oil by methanol is promoted by an heterogeneous catalyst, and very high yields of methyl esters, close to the theoretical value, are obtained.

TL;DR: In this paper, the authors showed that the junctions-based Cu 2 O, Bi 2 O 3 and ZnMn 2 O 4 /TiO 4 heterojunctions are able to absorb a large part of visible light (respectively, up to 650, 460 and 1000 nm).

TL;DR: The recent interest in gold catalysis provides the focus for this perspectives paper as mentioned in this paper, and aspects of both the background to this interest and some of the recent work on gold will be discussed.

TL;DR: The catalysis science of mixed metal oxides has undergone dramatic paradigm changes over the past 25 years as new characterization techniques became available (X-ray absorption spectroscopy (EXAFS/XANES/soft XANES), Raman, solidstate NMR, HR-TEM, UV-vis DRS and LEISS) to catalysis researchers as discussed by the authors.

TL;DR: In this article, a review of catalytic reactions performed in microstructured reactors is presented, which are particularly suited for highly exothermic and fast reactions allowing temperature control and isothermal operation.

TL;DR: The UOP/Hydro MTO process utilizes a SAPO-34-containing catalyst that provides up to 80% yield of ethylene and propylene at near-complete methanol conversion as discussed by the authors.

TL;DR: In this paper, the deoxygenation reaction of vegetable oils over a carbon-supported metal catalyst was studied as a suitable reaction for production of diesel-fuel-like hydrocarbons.

TL;DR: Operando spectroscopy is a methodology that combines the spectroscopic characterization of a catalytic material during reaction with the simultaneous measurement of catalytic activity/selectivity as mentioned in this paper.

TL;DR: In this article, the catalytic activity of a wide range of carbon materials for methane decomposition reaction was evaluated and major factors governing their activity were determined, such as structural and surface properties.

TL;DR: In this paper, a series of monometallic and bimetallic catalysts based on Au, Pd and Pt metals supported on carbon was used to study the effect of the metal on the distribution of the products.

TL;DR: In this paper, the physical, chemical and electronic structure properties of several close-packed surfaces of early transition metal carbides, including β-Mo2C(0, 0, 0), and the (1, 1, 1) surfaces of TiC, VC, NbC, and TaC were investigated.

TL;DR: In this article, the spectral changes of humic acids during photocatalytic oxidation process were investigated and the effects observed on the molecular size distribution of Humic acid focusing on their analysis by UV-vis and fluorescence spectroscopy.

TL;DR: In this article, the authors studied the effect of removing oxygen from carboxylic groups from wood-derived bio-oil with model compounds, methyl heptanoate and methyl hexanoate, on sulphided NiMo/γ-Al2O3 and CoMo/αγ-α 2O3 catalysts in a flow reactor.

TL;DR: In this article, the authors review the mechanisms that have been proposed for these catalysts and discuss the deactivation that has been observed, since a redox mechanism appears to explain the observations about the reaction best.

TL;DR: In this paper, the effect of the support only was studied and no glycerol conversion could be detected whereas gold nanoparticles supported on different carbons (carbon black, activated carbon and graphite) and oxides (TiO2, MgO and Al2O3) were active.

TL;DR: In this paper, the activity of fresh and hydrothermally aged zeolite-based catalysts in the NH 3 -selective catalytic reduction (SCR) reaction with excess of oxygen were studied.

TL;DR: In this paper, the active metabolite clofibric acid of some lipid lowering agents, the anti-epileptic drug carbamazepine and the X-ray contrast media iomeprol were selected.

TL;DR: Song et al. as mentioned in this paper presented a Shape-Selective Catalysis: chemicals synthesis and hydrocarbon processing, in: C. Song, J.F. Haw, W. Song and D.M. Chang.

TL;DR: An extensive series of 30 Cu exchanged zeolites and Cu impregnated silicas and aluminas have been tested in their capacities to stabilize the bis(μ-oxo)dicopper core as discussed by the authors.

TL;DR: In this paper, the cracking of light olefins contained in several naphthas seems to be a good alternative for responding to this demand, and the results of light FCC naphtha cracking have shown that selectivity towards propylene is governed by hydrogen transfer reactions.

TL;DR: In this article, an exhaustive review of the scientific literature on kinetic modeling of heavy petroleum fraction hydrocracking is reported, including models based on the lumping technique, continuous mixtures, structure oriented lumping, and single event models.

TL;DR: In this article, the textural properties of catalysts, such as pore diameter and pore volume, have been optimized to ensure adequate surface area The size and shape of catalyst particles are important for the efficient operation as well An active catalyst for hydroprocessing of heavy feeds has to be resistant to deactivation by coke and metal deposits

TL;DR: In this paper, a brief review of work from the author's laboratories summarises work on steam reforming and CO2 reforming reactions, discussing some catalysts developed for these reactions, and presents some work on the use of Mo and W carbides, with and without supports, for the CO 2 reforming reaction, showing that zirconia-supported Mo2C has some potential for use in the reaction.

TL;DR: In this paper, the stability of WC and W2C in an electrochemical environment has been examined using a half-cell in combination with X-ray photoelectron spectroscopy (XPS) to monitor changes in surface composition.

TL;DR: In this paper, an overview is given on extensive studies, which are targeted to involve N2O into organic synthesis as an oxidant, due to unique oxidative properties, nitrous oxide provides remarkable prospects in catalytic and non-catalytic oxidation chemistry in both gas and liquid phases.

TL;DR: In this article, the reaction was studied by a pulse technique using a CH4/CO2 ratio close to one, and the solids were characterized by X-ray diffraction (XRD), BET surface area, temperature-programmed reduction and oxidation (TPR-TPO), and scanning electronic microscopy (SEM).

TL;DR: In this article, the authors focused on the parameters of thermal treatment that influence the gold particle size in Au/TiO 2 samples prepared by different methods and found that the gold size decreases when the gas flow increases, when the amount of sample decreases, or when H 2 or Ar is used instead of air.

TL;DR: In this article, the authors show that with the advances of knowledge of heterogeneous catalysis (CeO2-ZrO2 mixed oxides being taken as an example), this term can nowadays appropriately apply to heterogeneous Catalysis as well.

TL;DR: In this article, it was shown that the determining rate of DME direct synthesis is determined by the acid properties of the dehydrating catalyst, i.e., its acid strength and number of acid sites.

TL;DR: In this article, the effect of water on the activity of sulphided NiMo/γ-Al2O3 and CoMo/β-Al 2O3 catalysts in hydrodeoxygenation (HDO) of aliphatic esters was investigated in a tubular reactor.