Abstract
In terms of chemical reaction kinetics, the efficiency of a catalyst can be characterized by its selectivity for a given product and its activity [1]. The activity refers to the rate at which it makes a reaction proceeds towards chemical equilibrium. It can be expressed as the number of reacted molecules per unit time and per active site, known as the turnover number. The selectivity measures the extent to which a catalyst accelerates the formation of a given product. It is defined as the percentage of the consumed reactant which is transformed to the desired product. Depending on the type of reaction being considered, a catalyst may be useful for its activity, its selectivity or both. If several products can possibly be formed, the selectivity is often the more important property.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
C.N. Satterfield, Heterogeneous Catalysis in Industrial Practice, 2nd Edition, McGraw-Hill, New-York (1990).
G.M. Paionk, Aerogels catalysts, Applied Catalysis, 72, 217 (1991)
D.A. Ward, E.I. Ko, Preparing catalytic materials by the Sol-Gel Method, I & EC Research, 34, 421 (1995)
M.A. Cauqui, J.M. Rodriguez-Izquierdo, Application of the sol-gel methods to catalyst preparation, J. of Non-Cryst. Solids, 147&148, 724 (1992)
T. Lopez, J. Navarette, R. Gomez, O. Novaro, F. Figueras, H. Armendariz, Preparation of sol-gel sulfated ZrO2-SiO2 and characterization of its surface acidity, Appl. Catalysis A: general, 125, 217 (1995)
H. Kochkar, F. Figueras, Synthesis of hydrophobic TiO2-SiO2 mixed oxides for the epoxidation of cyclohexene, J. of Catalysis, 171, 420 (1997)
P. Mars, D.W. van Krevelen, Oxidations carried out by means of vanadium oxide catalysts, Chem. Eng. Sei., Special Supplement, 3, 41 (1954)
Z. Paal, P.G. Menon, Hydrogen effect in catalysis, Marcel Dekker, New-York (1988)
G.A. Nicolaon, S.J. Teichner, Sur une nouvelle méthode de préparation de xérogels et d’aérogels de silice et leurs propriétés texturales, Bull. Soc. Chim. Fr., 1900 (1968); and Préparation des aérogels de silice à partir d’orthosilicate de méthyle en milieu alcoolique et leurs propriétés, Bull. Soc. Chim. Fr, 1906 (1968)
R.T.K. Baker, S.J. Tauster, J.A. Dumesic, Strong metal-support interactions, American Chemical Symposium Series, 298 (1986)
R.A. Caruso, M. Antonietti, M. Giersig, S.P. Hentze, J.G. Jia, Modification of TiO2 network structure using a polymer coating technique, Chem. of Mater., 13, 1114 (2001)
M. Astier, A. Bertrand, D. Bianchi, A. Chenard, G.E.E. Gardes, G. Pajonk, M.B. Taghavi, S.J. Teichner, B. Villemin, in: Studies in Surface Science and Catalysis, Preparation of Catalysts, B. Delmon, P.A. Jacobs, G. Poncelet, (eds.), 1, 315 (1976)
G. Matis, F. Juillet, S.J. Teichner, Oxydation catalytique ménagée des paraffines de catalyseurs à base d’oxyde de nickel — Séléctivité de l’oxydation partielle de l’isobutane et du propane, Bull. Soc. Chim. Fr., 1633 (1976)
R.J. Willey, H. Lai, J.B. Peri, Investigation of iron oxide-chromia-alumina aerogels for the selective catalytic reduction of nitric oxide by ammonia, J. Catal., 130, 319 (1991)
A.J. Fanelli, J.V. Burlew, G.B. Marsh, The polymerization of ethylene over TiCl4 supported on alumina aerogels: Low pressure results, J. Catal., 116, 318 (1988)
F. Blanchard, B. Pommier, J.P. Reymond, S.J. Teichner, On the mechanism of the FischerTropsch synthesis involving unreduced iron catalyst, J. Mol. Catal., 17, 171 (1982)
F. Blanchard, B. Pommier, J.P. Reymond, S.J. Teichner, New Fischer-Tropsch catalysts of the aerogel type, in: Studies in Surface Science and Catalysis, volume 16, Preparation of Catalysts III, G. Poncelet, P. Grange, P.A. Jacobs (editors), 395 (1983)
M.B. Taghavi, G.M. Pajonk, S.J. Teichner, On the structure-sensitive and structure-insensitive catalytic reactions and their new characteristics demonstrated with copper-supported attalysts, J. Colloid Interface Sei., 71, 451 (1979)
D. Klavana, J. Chaouki, D. Kusohorski, C. Chavarie, G.M. Pajonk, Catalytic storage of hydrogen: Hydrogenation of toluene over a nickel/silica aerogel catalyst in integral flow conditions, Appl. Catal., 42, 121 (1988)
M. Astier, A. Bertrand, S.J. Teichner, Activité, dans l’hydrogénation du benzène, de catalyseurs au platine déposé sur dioxyde de molybdène, Bull. Soc. Chim. Fr., 218 (1980)
J.N. Armor, E.J. Carlson, P.M. Zambri, Aerogels as hydrogenation catalysts, Appl. Catal., 19, 339 (1985)
M. Lacroix, G. Pajonk, S.J. Teichner, Activation for catalytic reactions of the silica gel by hydrogen spillover, in: Studies in Surface Science and Catalysis, volume 7, New Horizons in Catalysis, T. Seiyama, K. Tanabe (eds.), Elsevier Amsterdam, 279 (1981)
G.E.E. Gardes, G.M. Pajonk, S.J. Teichner, Préparation et propriétés des aerogels d’oxydes minéraux simples ou mixtes contenant le nickel métallique, Bull. Soc. Chim. Fr., 1327 (1976)
M. Astier, A. Bertrand, S.J. Teichner, Catalyseurs à base de dioxyde de molybdène sur nickel Mond et leur activité dans l’hydrogénation du benzène, Bull. Soc. Chim. Fr., 191 (1980)
G. Pajonk, M.B. Taghavi, S.J. Teichner, Nouveau catalyseur au cuivre pour l’hydrogénation sélective en phase gazeuse du cyclopentadiène en cyclopentène, Bull. Soc. Chim. Fr., 983 (1975)
M. Machida, K. Eguchi, H. Arai, Preparation of heat resistant ceramic support with large surface area from composite alkoxides, Chem. Letters (Japan), 1993 (1986)
M. Machida, K. Eguchi, H. Arai, High Temperature catalytic combustion over cation-substituted barium hexaaluminates, Chem. Letters (Japan), 767 (1987)
A. Dyer, An Introduction to zeolite molecular sieves, Wiley, Chichester (1988)
A. Corma, From microporous to mesoporous molecular sieve materials and their use in catalysis, Chem. Rev., 97, 2373 (1997)
A. Corma, M.S. Grande, V. Gonzales-Alfaro, A.V Orchilles, Cracking activity and hydrothermal stability of MCM-41 and its comparison with amorphous silica-alumina and a USY zeolite, J. Catal., 159, 375 (1996)
A. Corma, M. Iglesias, F. Sanchez, Large pore bifunctional titanium-aluminosilicates: the inorganic non-enzymatic version of the epoxidase conversion of linalool to cyclic ethers, J. chem. Snc Chem. Commun.. 1635 (1995)
T. Maschmeyer, F. Rey, G. Sankar, J.M. Thomas, Heterogeneous catalysts obtained by grafting metallocene complexes onto mesoporous silica, Nature, 378, 159 (1995)
R. Burch, N. Cruise, D. Gleeson, S.Ch. Tsang, Surface-grafted manganese-oxo species on the walls of MCM-41 channels-a novel oxidation catalyst, J. Chem. Soc. Chem. Commun., 951 (1996)
A. Corma, M. Iglesias, C. del Pinto, F. Sanchez, New Rhodium complexes anchored on modified USY zeolites. A remarkable effect of the support on the enantioselectivity of catalytic hydrogenation of prochiral alkenes, J. Chem. Soc. chem. Commun., 1253 (1991)
S. Braun, D. Avnir, To our readers, J. Sol Gel Science and Technology, 7, 5 (1996)
M. T. Reetz, A. Zonta, J. Simpelkamp, Efficient immobilization of lipases by entrapment in hydrolytic sol-gel materials, Biotech. and Bioeng., 49, 527 (1996)
P. Audebert, C. Sanchez, Modified electrodes from hydrophobic alkoxide silica gels — insertion of electroactive compounds and glucose oxidase, J. Sol Gel Science and Technology, 2, 809 (1994)
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2004 Springer Science+Business Media New York
About this chapter
Cite this chapter
Pierre, A. (2004). Catalysts. In: Aegerter, M.A., Mennig, M. (eds) Sol-Gel Technologies for Glass Producers and Users. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-88953-5_49
Download citation
DOI: https://doi.org/10.1007/978-0-387-88953-5_49
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4419-5455-8
Online ISBN: 978-0-387-88953-5
eBook Packages: Springer Book Archive