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The steady-state rate ofn-pentane conversion has been related to the Brønsted acidity of dealuminated (D) acid (H) Y zeolites (DHY) and ZSM-5 (DHZ). Low-temperature CO adsorption FTIR detects two kinds of Brønsted sites in DHZ and a distribution of Brønsted sites in DHY. In DHZ no Lewis sites were detected by this technique. In conjunction with results obtained by high-resolution 29 Si MAS...
The alumination of sepiolite led to a material with a moderate Lewis acidity, a high surface area, a microporous character, and a cation exchange capacity (CEC). The CEC increased to 45 meq/100 g and extraframework aluminum was formed. Alumination was accompanied by an increase in the sodium content of the sample and an improvement of the thermal stability, reflected in a microporosity more stable...