CATALYTIC ACTIVITY OF SULFONIC CLAYS IN ALKYLATION OF ISOBUTANE WITH C 4 OLEFINS
Modified clays were prepared by means of the impregnation with a Brönsted acid. The surface acidity was determinated by adsorption of piridine and Hammett indicators, indicated a population of Brönsted type sites above 876 umol/g. The textural parameters of the supports and catalysts, such as surface area, pore volume and mean pore size were determined by means of N 2 physical adsorption. The results showed an increased in surface area (23 m 2 /g to 105 m 2 /g). The catalitic activity of the clay modified was evaluated by the alkylat on of i-C 4 parafins, at the bench scale in a fixed bed reactor, both in liquid and gas phase, using a iC 4 /C 4= molar ratio, which led to 5.5 % trimethylpentanes against 35.9 % of C 8= and 53.4 % of heavier C 9+ products for the catalysts prepared in liquid phase having higher acid strength, i.e. Ho ≈ -9.3. The catalysts were activated with trifluorometansulfonic acid.
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