乙烷与CO2制乙烯反应的热力学和动力学研究

乙烷与ＣＯ２的主要反应及其热力学研究表明，乙烷与ＣＯ２反应很复杂，提高ＣＯ２氧化乙烷脱氢生成乙烯的选择，关键在一催化剂的开发；ＣＯ２不但可提高乙灶脱氢制乙烯的热力学平衡转化率，而且可与催化剂表面的积碳发生反应，延长催化剂的使用寿命。研究了催化剂上乙烷与ＣＯ２制乙烯反应的动力学，确定了ＣＯ２氧化乙烷脱氢反应的动力学方程及参数，表明乙烷与ＣＯ２制乙烯的反应速度比乙烷热裂解制乙烯的反应速度要大得多。

ANALYSES OF THERMODYNAMICS AND KINETICS FOR C 2H 6 DEHYDROGENATION WITH CO 2 TO C 2H 4

The main reaction routes of C 2H 6 with CO 2 and their thermodynamics and kinetics were studied, which indicated that there are very complex reactions between C 2H 6 and CO 2. CO 2 can enhance the equilibrium conversion of thermodynamics for C 2H 4 formation from C 2H 6 dehydrogenation and can react with the surface deposited carbon, resulting in prolonging the life time of the catalyst. However, the exploration of the catalyst with desirable C 2H 4 selectivity from C 2H 6 dehydrogenation is the most important. In our studies, an M/Si 2 catalyst has been developed for C 2H 4 formation from C 2H 6 dehydrogenation with CO 2 as an oxidant. The parameters of kinetics equations for C 2H 4 formation from C 2H 6 and CO 2 were calculated and showed that the rate of C 2H 4 formation from C 2H 6 and CO 2 is greater than the that of C 2H 4 formation from C 2H 6 cracking process.