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Book Review Application of Pattern Recognition to Catalytic Research. By I. I. Ioffe

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index is pleasingly free of errors. However, this reviewer was
surprised to find that a well-known Munich chemist seemed
to have acquired an aristocratic title.
The two volumes are well produced, and the structural
formulas are clear and easy to read. Some occasional instances where an R has been omitted from a formula or
silicon has apparently become sulfur are almost unavoidable. Errors that one notices instantly are few. Examples of
such are on page 1343, where the hydrosilylation mechanism
has been incorrectly taken from the original paper, and on
pages 659-660, where a synthetic route is given for tetracyclohexylsilane which was refuted as long ago as 1966.
The Iiterature coverage is claimed to extend to mid-1987,
and sometimes to the beginning of 1988. This has been
achieved in most, though not all, cases.
The editors indicate in the preface that the originally intended chapters on “Silyl radicals, silylenes and rearrangements” and on “Silicon-nitrogen bonds” could not be included. This is regrettable, since considerable advances have
been made in these areas especially in the last few years.
Thus, for example, it has proved possible to isolate a large
number of silanediyls (silylenes) in matrices. Trapping reactions of these intermediates have yielded various novel cyclic
and open-chain compounds.
These two volumes are definitely a must for all university
libraries. There is some confusion regarding the price information given by the publishers, since a large international
book supplier in West Germany quoted a price of more than
DM 1700 for the two volumes!
Manjred Weidenbruch [NB 991 IE]
Fachbereich Chemie
der Universitat Oldenburg (FRG)
Application of Pattern Recognition to Catalytic Research. By
I. I. lojfe. Research Studies Press, Letchworth/Wiley,
Chichester 1988. viii, 188 pp., hard cover, E 30.50. ISBN 0-86380-069-610-471-91907-1
In this monograph the author presents a survey of quantitative methods for the optimization of heterogeneous catalysts. The methods described, which belong to the category
called “pattern recognition”, are based on searching for correlations between the activity and selectivity of catalysts and
their chemical composition and properties. Properties such
as the specific surface area and density of the catalyst, and
the electron affinities, lowest ionization potentials and ionic
radii of the elements present, together with many other variables, have a major role in determining the catalytic activity.
Since in many cases there is not a simple linear relationship
between these properties and the activity and selectivity of
the catalyst, statistical methods are used to analyze the data.
The required data must either be taken from the literature or
determined by experiment. It is important to base the analysis on a large number of catalysts for the reaction being
investigated.
The first stage is to classify the catalysts into three groups
with high, medium and low selectivities, and to correlate
these with the properties of the catalysts concerned. On the
basis of the properties that show the best correlations, one
can now allocate new catalysts, which have not yet been
investigated, between these three groups. Finally, experiments must be carried out to test whether or not the method
of classification is appropriate. The purpose of such a study
is to reduce, by appropriate preselection, the number of experiments that are needed to evaluate new catalysts. The
questions of how reliable this classification is, and whether it
is likely to result in an active catalyst being rejected too soon
because of wrong classification, is determined, among other
factors, by the quality of the data used and of the computer
model. Accordingly, the greater part of the book is devoted
to a discussion of the various models for heterogeneous catalysts with one or more components. The capabilities and
limitations of the method are illustrated by examples such as
the aromatization of dodecane, the oxidation of arenes, and
the synthesis of isoprene from formaldehyde.
The monograph makes easy reading, and gives an insight
into the relationships between the molecular properties of
catalysts and their activities. However, those wishing to learn
about the technique in greater depth so as to apply it in their
own research will need to consult the original papers. Most
of these are only available in Russian, as can be seen from the
references listed. Consequently the book is of only limited
value to the experimentalist in his day-to-day work. It is
aimed more especially at readers who are involved in the
theoretical aspects of catalysts, or who are engaged in longterm development work on large-scale chemical processes
and need to evaluate large amounts of data.
Jochem Henkelmann [NB 1006 IE]
BASF AG, Ludwigshafen (FRG)
Re,q.Wr~v/NII~WJ, rradc.rnork,>,crc. used m l h i p , m a / . cvrn whPn not niarkrd 0 5 such. ure no1 10 he c o n s r ~ i w r du!~prolwle!/h? /OH
VCH Verlagsgesellschaft mbH. D-6940 Weinheim, 1990 - Printed in the Federal Republic of Germany by Konrad Triltsch Druck- und Verlagsanstalt Wurzburg
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Angew. Cliem. In!. Ed. Engl. 29 (1990) No. 2
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