Texture of catalyst

Composition, structure and texture of catalysts 1.3.1 General terms... 

A. J. Lecloux Texture of Catalysts Useful guidelines and methods for a systematic investigation and a coherent description of catalyst texture are proposed in this contribution. Such a description requires the specification of a very large number of parameters and implies the use of models involving assumptions and simplifications. The general approach for determining the porous texture of solids is based on techniques, whose results are cross analyzed in such a way that a self-consistent picture of the porous texture of solids is obtained. 

G. -M. Schwab History of Concepts in Catalysis. -J. Haber Crystallography of Catalyst Types. -G.Froment, L. Hasten Catalytic Kinetics Modelling. -A J. Lecloux Texture of Catalysts. - K Tanabe Solid Acid and Base Catalysts. 

It is the aim of this chapter to present a critical exposition of the use of adsorption methods for the characterization of heterogeneous catalysts. Such methods are applied to determine the texture of catalysts and therefore this concept has to be explained first. 

In the study of the texture of catalysts use is made of the physical adsorption of gases. Physical adsorption is an increase of concentration at the gas-solid or gas-liquid interface under the influence of integrated van der Waals-London forces, also known as de Boer-Hamaker forces. 

A large surface area per unit of volume (or weight), a desired property for many catalysts, brings problems which are dealt with in the last section about the texture of catalysts. 

The texture of catalysts is often modified during operation, as revealed by shifts in the pore size distribution, in chromia/alumina catalysts segregation of the components has been shown to occur, but deactivation has also been shown to occur through the formation of a solid solution. 

Kolb M., Botet R., Juhien R. Scaling ofkinetically growing clustCTS. Phys. Rev. Lett. 1983 51 1123 Lecloux A.J. Texture of catalysts, in Catalysis Science and Technology, J.R. Anderson, M. Boudart, eds., vol. 2, p. 171, Springer, Berlin, 1981... 

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