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用外循环无梯度反应器研究了MoBiP_(1.(?))/SiO_2、MoBiP_(2.0)/SiO_2、MoBiP_(2.2)/SiO_2、MoBiP_(2.4)/SiO_2、MoBiP_(3.0)/SiO_2催化剂酸性与顺-丁烯-2异构化活性的关系。顺-丁烯-2异构生成丁烯-1速度r_c用可逆L-H机理方程描述: r_c=k_cb_c(P_c-P_1/K_(1/c)/r+(b_cP_c)式中:k_c为顺-丁烯-2异构生成丁烯-1的速度常数;b_c为顺-丁烯-2吸附系数;P_1、P_c分别为丁烯-1及顺-丁烯-2分压;K_(1/c)为顺-丁烯-2异构生成丁烯-1的平衡常数。催化剂活性用顺-丁烯-2异构生成丁烯-1速度常数表示。在不同磷含量催化剂上顺-丁烯-2异构化活化能近似为一常数,约为41.5kmol/mol。用吸附指示剂正丁胺滴定法测定了催化剂的酸性。催化剂显中等程度的酸性,催化剂的酸度随催化剂中磷原子比的增加而增加,催化剂的酸度与顺-丁烯-2异构化活性呈线性关系。用动力学观点对上述实验结果进行了解释。
The effects of MoBiP_ (1) / SiO_2, MoBiP_ (2.0) / SiO_2, MoBiP_ (2.2) / SiO_2, MoBiP_ (2.4) / SiO_2 and MoBiP_ (3.0) The relationship between cis-butene-2 isomerization activity. The isomerization of cis-butene-2 to butene-1 can be described by the reversible LH mechanism equation: r_c = k_cb_c (P_c-P_1 / K_ (1 / c) / r + (b_cP_c) where k_c is cis-butene -2 isomerization to form butene-1; b_c is cis-butene-2 adsorption coefficient; P_1, P_c are the partial pressure of butene-1 and cis-butene-2; K_ (1 / c) The equilibrium constants of cis-butene-2 isomerization to butene-1 are shown in Fig. 1. The catalyst activity is expressed as the isobutene-1 rate constant of cis-butene-2 isomerization to cis-butene-2 The constitutive activation energy is approximately a constant of about 41.5 kmol / mol. The acidity of the catalyst was measured by the n-butylamine titration method. The acidity of the catalyst was moderate. The acidity of the catalyst increased with the increase of phosphorus atomic ratio in the catalyst Increases, the acidity of the catalyst is linearly related to the isomerization activity of cis-butene-2, and the above experimental results are explained by the kinetic point of view.