Buzzi-Ferraris

Buzzi-Ferraris et al., (1983, 1984) proposed the use of a more powerful statistic for the discrimination among rival models however, computationally it is more intensive as it requires the calculation of the sensitivity coefficients at each grid point of the operability region. Thus, the simple divergence criterion of Hunter and Reimer (1965) appears to be the most attractive. 

Buzzi-Ferraris, G. and P. Forzatti, "A New Sequential Experimental Design Procedure for Discriminating Among Rival Models", Chem. Eng. Sci., 38, 225-232(1983). 

Buzzi-Ferraris, G., and Donati, G. 1974. A powerful method for Hougen-Watson model parameter estimation with integral conversion data. Chem. Eng. Sci. 29 1504-9. 

Robust, multimethod regression codes are required to optimize the rate parameters, also in view of possible strong correlations. For example, the BURENL routine, specifically developed for regression analysis of kinetic schemes (Donati and Buzzi-Ferraris, 1974 Villa et al., 1985) has been used in the case of SCR modeling activities. The adaptive simplex optimization method Amoeba was used for minimization of the objective function Eq. (35) when evaluating kinetic parameters for NSRC and DOC. 

Buzzi-Ferraris, G., Planning of experiments and kinetic analysis. Catalysis Today 52 (1999) 125-132. 

P. Forzatti and G. Buzzi-Ferraris, Reaction - deactivation kinetics of... 

Buzzi Ferraris et al. (1974) use the mathematical analysis of kinetic data to build rate equations for the ammonia synthesis reaction. They offer more than 20 models which give good fitting of experimental data. 

Buzzi-Ferraris, G., P. Forzatti, G. Emig and H. Hofmann, "Sequential Experimental Design for Model Discrimination in the Case of Multiple Responses", Chem. Eng. ScL, 39(1), 81-85 (1984). 

The model equations were solved numerically by discretizing the partial differential equations (PDEs) with respect to the spatial coordinate (x). Central finite difference formulae were used to approximate the first and second derivatives (e.g. dc,/dx, d77ck). Thus the PDEs were transformed to ODEs with respect to the reaction time and the finite difference method was used in the numerical solution. The recently developed software of Buzzi Ferraris and Manca was used, since it turned out to be more rapid than the classical code of Hindmarsh. 

In addition to the skeptic s view of LH correlations, however, there must be additional reasons why this model has been used successfully for the correlation of kinetics in so many different types of catalytic reactions. Two factors seem to be most important. First is the fact that the expressions are fairly insensitive to the precise sort of kinetic scheme involved. Many widely differing types of reaction sequences can be shown to give approximate LH forms, as given in Tables 3.2 and 3.3 [see also a further good example based on the ammonia synthesis reaction by G. Buzzi Ferraris, G. Donati, F. Rejna and S. Carra, Chem. Eng. Sci., 29, 1621 (1974)]. Second is the fact that for reasonable assumptions concerning the nature of typical nonuniform surfaces it can be shown that they tend to look like uniform surfaces in overall behavior. This second point can be illustrated by an example scheme in which the heat of formation of surface complexes is a linear function of surface coverage. Consider the two-step sequence... 

Buzzi-Ferraris G, Forzatti P, Emig G, Hofmann H. Chem Eng Sci 1984 39 81. 

Fig. 3.1.3-2 Types of difFerential circulating reactors with catalyst beds [Buzzi-Ferraris 1999, Perego 1999, Forni 1997] for determining the kinetics of heterogeneously catalyzed reactions, a) Spinning-basket principle a rotating basket containing catalyst pellets acts as a stirrer, b) Jet principle with internal recirculation [Luft 1973b, Luft 1978, Dreyer 1982]. c) External recirculation.

Print ISBN 978-3-527-32652-5 Buzzi-Ferraris, Guido/Manenti, Flavio... 

Guido Buzzi-Ferraris (1994), Scientific C++ Building Numerical Libraries, the Object-Oriented Way, 2nd ed., Addison-Wesley, Cambridge University Press, 479 pp, ISBN 0-201-63192-X. 

Guido Buzzi-Ferraris and Flavio Manenti (2010), Fundamentals and Linear Algebra for the Chemical Engineer Solving Numerical Problems, Wiley-VCH Verlag GmbH, Weinheim, 360 pp, ISBN 978-3-527-32552-8. 

The book describes numerical methods, high-performance algorithms, specific devices, and innovative techniques and strategies, all of which are implemented in a well-established numerical library the BzzMath library, developed by Prof. Guido Buzzi-Ferraris at the Politecnico di Milano and downloadable from http // www.chem.polimi.it/homes/gbuzzi. 

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