The relations between catalytic activities and compositions of the systems Mg_xZn_(1-x)Fe_2O_4, Co_xZn_(1-x)Fe_2O_4, Co_xMg_(1-x)Fe_2O_4, Cd_xZn_(1-x)Fe_2O_4 and Mg_xZn_(1-x)Fe_2O_4·0.17Fe_2O_3 have been studied ...The relations between catalytic activities and compositions of the systems Mg_xZn_(1-x)Fe_2O_4, Co_xZn_(1-x)Fe_2O_4, Co_xMg_(1-x)Fe_2O_4, Cd_xZn_(1-x)Fe_2O_4 and Mg_xZn_(1-x)Fe_2O_4·0.17Fe_2O_3 have been studied by flow differential reactor, XRD, and derivative IR techniques. It has been found that the appropriate normal-inverse spinel combination substantially increases the activity for the title raction. The structure of the active site and the role of the bivalent cation in the title catalyst have been inferred.展开更多
以硫酸为催化剂,间歇实验研究了276.2-285.2 K温度范围内混合丁烯/异丁烷烷基化反应动力学。实验结果表明,随着反应温度的降低,主产物三甲基戊烷（TMPs）生成量和烷基化油整体辛烷值增大,副产物二甲基己烷（DMHs）变化较小,高碳组分（HE...以硫酸为催化剂,间歇实验研究了276.2-285.2 K温度范围内混合丁烯/异丁烷烷基化反应动力学。实验结果表明,随着反应温度的降低,主产物三甲基戊烷（TMPs）生成量和烷基化油整体辛烷值增大,副产物二甲基己烷（DMHs）变化较小,高碳组分（HEs）的生成量降低明显。采用基于碳正离子反应机理建立的烷基化动力学模型对TMPs、DMHs、HEs 3类组分进行了计算分析,模拟计算结果表明,动力学模型对实验数据的拟合效果良好。链引发步骤异丁烯加氢离子反应表现出反Arrhenius行为,其本身及逆反应的活化能分别为45.14 k J·mol^-1和41.44 k J·mol^-1,增加对链传递部分C8正碳离子形成步骤的速率常数计算,部分涉及链传递和链终止反应步骤反应速率常数与文献值保持一致。展开更多
基金Project supported by National Natural Science Foundation of P. R. China.
文摘The relations between catalytic activities and compositions of the systems Mg_xZn_(1-x)Fe_2O_4, Co_xZn_(1-x)Fe_2O_4, Co_xMg_(1-x)Fe_2O_4, Cd_xZn_(1-x)Fe_2O_4 and Mg_xZn_(1-x)Fe_2O_4·0.17Fe_2O_3 have been studied by flow differential reactor, XRD, and derivative IR techniques. It has been found that the appropriate normal-inverse spinel combination substantially increases the activity for the title raction. The structure of the active site and the role of the bivalent cation in the title catalyst have been inferred.
文摘以硫酸为催化剂,间歇实验研究了276.2-285.2 K温度范围内混合丁烯/异丁烷烷基化反应动力学。实验结果表明,随着反应温度的降低,主产物三甲基戊烷（TMPs）生成量和烷基化油整体辛烷值增大,副产物二甲基己烷（DMHs）变化较小,高碳组分（HEs）的生成量降低明显。采用基于碳正离子反应机理建立的烷基化动力学模型对TMPs、DMHs、HEs 3类组分进行了计算分析,模拟计算结果表明,动力学模型对实验数据的拟合效果良好。链引发步骤异丁烯加氢离子反应表现出反Arrhenius行为,其本身及逆反应的活化能分别为45.14 k J·mol^-1和41.44 k J·mol^-1,增加对链传递部分C8正碳离子形成步骤的速率常数计算,部分涉及链传递和链终止反应步骤反应速率常数与文献值保持一致。
基金supported by the Zhejiang Provincial Natural Science Foundation of China(No.LZ13B060004)the Program for Zhejiang Leading Team of S&T Innovation(No.2013TD07)the National Natural Science Foundation of China(No.U1362102)
