用热重技术分析Ni/γ-Al_2O_3催化剂上的积炭行为

采用热重技术考察了４种镍基催化剂对ＣＨ４（实验中均使用天然气）┐ＣＯ２转化制备合成气在Ｖ（ＣＯ２）／Ｖ（ＣＨ４）＝１．３条件下的程序升温积炭行为，以及添加助剂的Ｎｉ┐２┐ＲＭ催化剂在不同Ｖ（ＣＯ２）／Ｖ（ＣＨ４）比时的积炭情况。结果表明添加助剂ＲＥ２Ｏ３和碱土助剂ＭｇＯ可提高催化剂的抗积炭能力；增大Ｖ（ＣＯ２）／Ｖ（ＣＨ４）比也可有效地防止积炭，进一步得出了４００℃焙烧的Ｎｉ┐２┐ＲＭ催化剂活性组份氧化物为Ｎｉ２Ｏ３的结论。

Investigation of carbon deposition on Ni/ γ Al 2O 3 catalyst by using TG technique

The performance of carbon deposition on four Ni based catalysts have been investigated by using TG technique, at a CO 2/CH 4 ratio of 1.3 for CH 4 reforming with CO 2 to produce synthesis gas. In the mean time, carbon deposition on the Ni 2 RM catalyst to which promoters are added has also been studied at various ratios of CO 2/CH 4.The results show that promoters, RE 2O 3 and MgO, can improve the ability of resistance to carbon deposition on the Ni based catalyst. Also the catalyst can be prevented effectively from carbon depositing by increasing the ratio of CO 2/CH 4. Furthermore, it is concluded that Ni 2O 3 is the active component of the Ni 2 RM calcined at 400℃