以Cu/Ni为主活性组分,γ-Al2O3球为载体,考察了Mn助剂对N,N-二甲基乙醇胺(DMEA)固定床连续催化胺化制备N,N,N',N'-四甲基乙二胺(TMEDA)催化剂性能的影响,并通过XRD、BET/BJH、H2-TPR、H2-TPD等对催化剂结构进行表征,结果表明,M...以Cu/Ni为主活性组分,γ-Al2O3球为载体,考察了Mn助剂对N,N-二甲基乙醇胺(DMEA)固定床连续催化胺化制备N,N,N',N'-四甲基乙二胺(TMEDA)催化剂性能的影响,并通过XRD、BET/BJH、H2-TPR、H2-TPD等对催化剂结构进行表征,结果表明,Mn能够抑制脱氢而促进加氢反应的发生,随着Mn含量的增加,选择性会提高,而活性相对会受到抑制,当n(Cu)∶n(Ni)∶n(Mn)=4∶1∶0.2时催化剂性能较佳。采用4Cu-1Ni-0.2Mn/γ-Al2O3球作为催化胺化催化剂,在反应温度为240℃,DMEA空速为0.15 h-1,胺醇摩尔比为1∶1,常压,氢速为30 m L/min时,DMEA转化率和TMEDA选择性分别达到92%和83%左右。展开更多
To get more accurate kinetic data of the absorption of CO2 into aqueous solution of N-methyldiethanolamine,a wetted wall column was modified to more uniformly distribute the liquid on the column surface and gas in the...To get more accurate kinetic data of the absorption of CO2 into aqueous solution of N-methyldiethanolamine,a wetted wall column was modified to more uniformly distribute the liquid on the column surface and gas in the absorbing chamber and change the length of the column.The average liquid film thickness and the liquid-phase mass transfer coefficient were measured,and a correlation for the Sherwood number,Reynolds number and Schmidt number was obtained for the modified wetted wall column.The equilibrium concentrations in chemical reactions were calculated with a minor absolute error for calculating the rate constant more accurately.A mathe-matical model for the CO2 absorption was established based on the diffusional mass transfer accompanied with parallel reversible reactions,and the partial differential equation was solved by Laplace transform.An analytical ex-pression for the concentration of carbon dioxide as a function of time and penetration depth in liquid film and the average interphase mass transfer rate was obtained.This model was also used to calculate the rate constant for a second-order reaction,which was in good agreement with reported data.展开更多
文摘以Cu/Ni为主活性组分,γ-Al2O3球为载体,考察了Mn助剂对N,N-二甲基乙醇胺(DMEA)固定床连续催化胺化制备N,N,N',N'-四甲基乙二胺(TMEDA)催化剂性能的影响,并通过XRD、BET/BJH、H2-TPR、H2-TPD等对催化剂结构进行表征,结果表明,Mn能够抑制脱氢而促进加氢反应的发生,随着Mn含量的增加,选择性会提高,而活性相对会受到抑制,当n(Cu)∶n(Ni)∶n(Mn)=4∶1∶0.2时催化剂性能较佳。采用4Cu-1Ni-0.2Mn/γ-Al2O3球作为催化胺化催化剂,在反应温度为240℃,DMEA空速为0.15 h-1,胺醇摩尔比为1∶1,常压,氢速为30 m L/min时,DMEA转化率和TMEDA选择性分别达到92%和83%左右。
基金Supported by China Petroleum&Chemical Corporation(105044)
文摘To get more accurate kinetic data of the absorption of CO2 into aqueous solution of N-methyldiethanolamine,a wetted wall column was modified to more uniformly distribute the liquid on the column surface and gas in the absorbing chamber and change the length of the column.The average liquid film thickness and the liquid-phase mass transfer coefficient were measured,and a correlation for the Sherwood number,Reynolds number and Schmidt number was obtained for the modified wetted wall column.The equilibrium concentrations in chemical reactions were calculated with a minor absolute error for calculating the rate constant more accurately.A mathe-matical model for the CO2 absorption was established based on the diffusional mass transfer accompanied with parallel reversible reactions,and the partial differential equation was solved by Laplace transform.An analytical ex-pression for the concentration of carbon dioxide as a function of time and penetration depth in liquid film and the average interphase mass transfer rate was obtained.This model was also used to calculate the rate constant for a second-order reaction,which was in good agreement with reported data.
