Author
Á. Fudala
Bio: Á. Fudala is an academic researcher from University of Szeged. The author has contributed to research in topics: Catalysis & Mesoporous material. The author has an hindex of 9, co-authored 19 publications receiving 451 citations.
Topics: Catalysis, Mesoporous material, Ion exchange, Adsorption, Zeolite
Papers
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TL;DR: In this paper, the synthesis of carbon nanotubes with fullerene-like structure using supported transition metal/zeolite catalysts was carried out under relatively mild conditions in a fixed bed flow reactor.
216 citations
TL;DR: In this paper, surface acidity and propane transformation on In-and Ga-containing ZSM-5 type zeolites were investigated to find relation between the acidic character of catalysts prepared by conventional or solid state ion exchange and the catalytic activity in alkane aromatization.
52 citations
TL;DR: In this paper, the authors showed that the interaction of the two phases might be responsible for the catalytic activity, while the method of dispersal seemed to be important for the quality and surface area of the carbon deposit.
Abstract: Carbon nanofibers with high surface area can be synthesized in a simple one-step reaction under relatively mild conditions using unsupported SnO-doped Fe 3 C catalyst. The highest activity and carbon fibers with high surface area were obtained with catalyst prepared by direct precipitation. Over this sample, selectivity of carbon deposit formation was close to 100%. It was concluded that the interaction of the two phases might be responsible for the catalytic activity, while the method of dispersal seemed to be important for the quality and surface area of the carbon deposit.
34 citations
TL;DR: The results of catalytic studies show that cesium salts of dodecatungstophosphoric acid with low Cs content supported on silica or MCM-41 are active, selective, and recyclable catalysts in Friedel-Crafts alkylations (isopropylation, transalkylation), the aromatic ortho-Claisen rearrangement, and the dehydration of pinacol as mentioned in this paper.
30 citations
TL;DR: In this article, the synthesis of mesoporous materials by intercalation of silica between magadiite layers was carried out for the preparation of the composite material, reactive silica gels with compositions characteristic for the synthesis MCM-41 were used Samples synthesized with various compositions were characterized by X-ray diffraction, IR and NMR spectroscopy, thermal analysis, thermal and electrical measurements as well as scanning and transmission electron microscopy.
23 citations
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TL;DR: In this article, a review of the progress to date in the field of mechanical reinforcement of polymers using nanotubes is presented, and the most promising processing methods for mechanical reinforcement are discussed.
3,770 citations
TL;DR: In this article, the theoretical external specific surface area of single and multi-walled carbon nanotubes and of carbon-nanotube bundles is calculated as a function of their characteristics.
1,836 citations
TL;DR: The study compares different catalysts in terms of the reaction mechanism and deactivation pathways and catalytic performance, as dehydrogenation for the production of light olefins has become extremely relevant.
Abstract: A study is conducted to demonstrate catalytic dehydrogenation of light alkanes on metals and metal oxides. The study provides a complete overview of the materials used to catalyze this reaction, as dehydrogenation for the production of light olefins has become extremely relevant. Relevant factors, such as the specific nature of the active sites, as well as the effect of support, promoters, and reaction feed on catalyst performance and lifetime, are discussed for each catalytic Material. The study compares different catalysts in terms of the reaction mechanism and deactivation pathways and catalytic performance. The duration of the dehydrogenation step depends on the heat content of the catalyst bed, which decreases rapidly due to the endothermic nature of the reaction. Part of the heat required for the reaction is introduced to the reactors by preheating the reaction feed, additional heat being provided by adjacent reactors that are regenerating the coked catalysts.
1,306 citations
TL;DR: In this paper, it is shown that for these applications the electrochemical properties of multiwalled and single walled (SWNTs) nanotubes are essentially dominated by their mesoporous character, and an almost linear dependence has been found between the mesopore volume and Cirr.
1,013 citations
TL;DR: In this article, the authors proposed a supported catalyst-substrate system to promote the growth of single-wall carbon nanotubes in a specific size range, rather than the large irregular-sized multi-walled carbon fibrils that are known to grow from supported catalysts.
903 citations