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- Activity–acidity relationship in zeolite Y: Part 3. Application of Brönsted type equationsPublication . Costa, Carla; Lopes, Jose M.; Lemos, Francisco; Ribeiro, F. RamôaThe relation between activity and acidity in a variety of Y zeolite catalysts for the transformation of small olefins: ethene, propene, 1-butene and iso-butene, is presented. The acid site distribution of these samples was estimated by temperature-programmed desorption of ammonia, by using a numerical deconvolution technique. This information was then correlated with catalytic activity measurements using Brönsted type equations. Despite the complexity of calculations it is clear that this gas phase solid acid catalysed reactions follow simple rules, similar to the one observed in homogeneous processes.