Isobutanol Dehydration to Isobutylene over Active Alumina Catalyst
1. Enze Biomass Fine Chemicals Beijing Municipal Key Laboratory, Beijing 102617, China; 2. Beijing University of Chemical Technology, Beijing 100029, China
Abstract：Pseudo-boehmite was calcined at 500℃ to make alumina catalysts (denoted as 500-Al2O3). The catalysts were characterized by X-ray diffraction (XRD), physical adsorption (BET), and NH3 temperature-programmed desorption (NH3-TPD). The catalytic performance was evaluated with the dehydration reaction of isobutanol to isobutylene in a fixed bed micro-reactor. The results showed that the 500-Al2O3 catalyst had the form of γ-Al2Ophase, the specific surface area was 275 m2/g, the pore volume was 0.42 cm3/g, and the total acid was 0.5415 mmol/g. The catalyst exhibits very good reactive performance for the dehydration of isobutanol to isobutene with good stability and high selectivity. Under the reaction conditions of temperature 270 ℃, atmospheric pressure, liquid hourly space velocity 0.21 h-1, carrier gas flow rate 60 mL/min, the conversion of isobutanol and the selectivity of isobutylene were 99.46% and 98.76%, respectively.
