The Synthesis of 1,4-Diazabicyclo (2.2.2) Octane over a Pre-Treated Titanium Silicalite-1 Catalyst |
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Authors: | Dishun Zhao Erhong Duan Juan Zhang Xiaoli Zhang |
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Affiliation: | 1. School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, People’s Republic of China 2. School of Chemical and Pharmaceutical Engineering, Hebei University of Science and Technology, Shijiazhuang, Hebei, 050018, People’s Republic of China
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Abstract: | Potassium chloride salt pre-treated titanium silicalite-1 (TS-1) zeolite (K-TS-1) was prepared via an ion-exchange method. XRD, EDX and BET were used to identify the structure of the zeolite. The BET surface area and the adsorption/desorption cumulative pore volume of the K-TS-1 catalyst were about 297 m2/g and 0.213 cm3/g, respectively. The average pore diameter of the K-TS-1 catalyst was 29.49 Å. The catalytic activity of K-TS-1 catalyst was studied in the fixed-bed catalytic reactor. 1,4-Diazabicyclo (2.2.2) octane (DABCO) was prepared from ethylenediamine (EDA) over the K-TS-1 zeolite catalyst. The influences of various reaction parameters such as reaction temperature, space velocity and concentration of EDA were discussed. The conversion of EDA was more than 96% and the selectivity of DABCO and PIP were up to 64 and 30%, respectively, in the temperature of 340 °C and weight hourly space velocity of 1.5 h?1 in the presence of water. |
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