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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。
The Cu / Ni-based active component and γ-Al2O3 sphere were used as carriers to investigate the effects of Mn promoter on the catalytic catalytic amination of N, N-dimethylethanolamine (DMEA) - tetramethylethylenediamine (TMEDA) catalyst. The structure of the catalyst was characterized by XRD, BET / BJH, H2-TPR and H2-TPD. The results showed that Mn could inhibit the dehydrogenation and promote the hydrogenation reaction With the increase of Mn content, the selectivity increases and the activity is relatively inhibited. The catalyst performance is better when n (Cu): n (Ni): n (Mn) = 4:1:0.2. 4Cu-1Ni-0.2Mn / γ-Al2O3 ball was used as catalytic amination catalyst. The reaction temperature was 240 ℃, the space velocity of DMEA was 0.15 h-1, the molar ratio of amine to alcohol was 1: 1, m L / min, DMEA conversion and TMEDA selectivity reached 92% and 83%, respectively.