Most of the large number of acronyms added to BET between ICC 1 in 1956 and ICC 11 in 1996 represent new techniques for analyzing the products of reaction, for characterizing catalysts and for determining the structure of chemisorbed species. Use of these techniques has substantially altered the practice of catalysis. Only the elderly will remember the great improvement in the quality of life which resulted from the fulfillment of Emmett's prophecy, that gas chromatography appeared "destined to provide a rapid, accurate method for the analysis of complicated mixtures of products in a relatively simple, straightforward manner" (ICC 1, paper 65). To GC can be added scaning FTIR, NMR, EPR, microwave spectroscopy, and various MS.
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