Advantages over chemical catalysts

Since then chemists worldwide have prepared numerous tailor-made modified zeolites, and the synthetic potential for the production of organic intermediates and high-value fine chemicals is enormous. How can the success of this new class of catalysts in industry and academe be explained It is due to the outstanding catalytic properties of the zeolites. No other class of catalysts offers so much potential for variation and so many advantages in application. Their advantages over conventional catalysts can be summarized as follows ... 

Despite the advantages of lipases over chemical catalysts, biodiesel production using lipases has not yet been commercialized. To achieve this, several technical and economic challenges need to be overcome. The most important is the high cost of the enzyme, compared to chemical catalysts, and the inhibition by alcohol. Therefore, selection of the lipase and the optimization of reaction parameters are important aspects that have to be considered to obtain increased and purified biodiesel yields. 

It has been shown that the interpretation of catalytic reactions involving group VIII transition metals in terms of n complex adsorption possesses considerable advantages over classical theories by providing a link between theoretical parameters and chemical properties of aromatic reagents and catalysts. The concept has led to the formulation of a number of reaction mechanisms. In heavy water exchange the dissociative tt complex substitution mechanism appears to predominate it could also play a major role when deuterium gas is used as the second reagent. The dissociative mechanism resolves the main difficulties of the classical associative and dissociative theories, in particular the occurrence... 

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