稀土添加剂对镍转化催化剂性能的影响 Ⅰ、对催化剂低温活性的影响

The effect of rare earth additives on the catalytic behavior of the nickel catalyst for natural gas-steam reforming 1. Activity at low-temperature

研究了不同稀土添加剂对Ni/α=Al_2O_3催化剂活性的影响。实验结果表明:镧、钕的添加量几乎不影响催化剂的活性;钇、铒添加量有一定的影响;钐、钆、镝的添加量对活性影响最大。稀土的添加顺序对催化剂活性的影响也是不同的。总的看来,混浸优于其他两种浸渍方式,而且制备工艺也比较简单。

The effect of rare earths on the catalytic activity of Ni/a-Al_2O_3 has been studied. Experimental results show that the addition of La and Nd has little change in activity; But the activity changes to some extent by adding quantities of Y and Er; The most conspicuous influence on the catalytic activity is exerted by quantities of Sm, Gd and Dy. A different sequence of the addition of rare earth also has influence on itsactivity. In the general, mixed impregnation is considered a better one. Moreover the preparation technique is rather simple.