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用玻璃外循环反应器研究了MoBiP_(1.8)/SiO_2,MoBiP_(2.0)/SiO_2,MoBiP_(2.2)/SiO_2,MoBiP_(2.4)/SiO_2及MoBiP_(3.0)/SiO_2催化剂上丁烯-1异构化动力学。在200—280℃之间丁烯-1异构成反-丁烯-2及顺-丁烯-2的速度方程分别为其中K_(1-t),K_(1-c)分别为丁烯-1异构成反-丁烯-2及顺-丁烯-2的速度常数;P_1,P_t,P_c分别为丁烯-1,反-丁烯-2及顺-丁烯-2的分压,b_1为丁烯-1吸附系数;K_(t/1),K_(c/1)分别为丁烯-1异构成反-丁烯-2及顺-丁烯-2的平衡常数。 在不同催化剂上丁烯-1异构成反-丁烯-2及顺-丁烯-2的活化能为一常数,约为11千卡/克分子。 用吸附指示剂正丁胺滴定法测定了催化剂的酸性,催化剂显中等强度的酸性。催化剂的酸度随催化剂中磷原子比的增加而增加。催化剂的酸度与丁烯-1异构化活性呈线性关系。
The effects of MoBiP_ (1.8) / SiO_2, MoBiP_ (2.0) / SiO_2, MoBiP_2.2 / SiO_2, MoBiP_ (2.4) / SiO_2 and MoBiP_ (3.0) Kinetics. The isopro-butene-2 and cis-butene-2 isomerization equations for butene-1 isomerization at 200-280 ℃ are as follows: where K_ (1-t) and K_ (1-c) 1 isomerised into the rate constants of trans-butene-2 and cis-butene-2; P_1, P_t and P_c are the partial pressures of butene-1, trans-butene- Is the adsorption coefficient of butene-1. K_ (t / 1) and K_ (c / 1) are the equilibrium constants of isobutene-2 and cis-butene-2, respectively. The activation energies of isobutene-1 isomerization to butene-2 and cis-butene-2 on different catalysts were constant, about 11 kcal / mol. The adsorption index n-butylamine titration method was used to determine the acidity of the catalyst, the catalyst showed moderate acidity. The acidity of the catalyst increases with the increase of phosphorus atomic ratio in the catalyst. The acidity of the catalyst has a linear relationship with the isomerization activity of butene-1.