论文部分内容阅读
采用离子交换法制得的IrZSM-5催化剂在催化1-己烯氢甲酰化反应中,副反应己烯加氢生成正己烷较多。用三苯基膦和甲醛在CO/H_2反应气中对催化剂进行改性,产物醛的选择性显著提高。CO、H_2吸附研究结果表明,改性使催化剂对H_2的不可逆吸附及V_(CO)/V_(H_2)比降低,而使其对CO的吸附变得完全可逆。反应动力研究表明,总压对改性后催化的活性,选择性明显影响,但产物醛的正/异比按总压升高而降低。CO分压升高有利于醛的生成和正/异比的提高。提高反应温度和选择性,正/异比降低。通过非线性回归分析,建立速率方程如下:r=kC_(C_6)~(0.9)P_(H_2)~(0.99)P_(CO)~(-1.05) 活化能E=43.1kJ/mol
IrZSM-5 catalyst prepared by ion exchange method in the catalytic 1-hexene hydroformylation reaction, side reaction of hexene to n-hexane more. The catalyst was modified with triphenylphosphine and formaldehyde in the CO / H 2 reaction gas, and the selectivity of the product aldehyde was significantly improved. The results of CO and H_2 adsorption show that the modification can make the catalyst irreversibly adsorb H_2 and decrease the ratio of V_ (CO) / V_ (H_2), making the adsorption of CO to be completely reversible. The study of reaction kinetics shows that the total pressure has a significant effect on the activity and selectivity of the modified catalyst, but the positive / negative ratio of the product aldehyde decreases with the increase of the total pressure. Increased CO partial pressure is conducive to the formation of aldehyde and the increase of positive / negative ratio. Increase the reaction temperature and selectivity, reduce the positive / negative ratio. Through nonlinear regression analysis, the rate equation was established as follows: r = kC_ (C_6) ~ (0.9) P_ (H_2) ~ (0.99) P_ (CO) ~ (-1.05) Activation energy E = 43.1 kJ / mol