论文部分内容阅读
本文以气体烃和水蒸汽为还原介质,在实验室条件下,研究了三种大型氨厂应用的一次烃水蒸汽转化催化剂。在实验过程中,观察到了一系列有趣的现象。如:在催化剂制备过程中,采用不同的方法和条件,还原起始温度(简写为STR,下同)就会有很大差别。在许多情况下,也观察到水蒸汽与碳之比对催化剂的STR有显著影响。催化剂Z107显示出较高的STR,并且当温度在800℃或更高时,部分生成NiAl_2O_4,经还原氧化后的催化剂在再还原过程中,也可以观察到其STR与原始值相比大大下降,仅为450℃。本文以此实验结果和热力学分析为基础提出了薄活性的出现和局部形成机理以及还原反应机理。
In this paper, gas hydrocarbons and water vapor as reducing medium, under laboratory conditions, the three major ammonia plant application of primary hydrocarbon steam reforming catalyst. During the experiment, a series of interesting phenomena were observed. Such as: In the catalyst preparation process, using different methods and conditions, reducing the initial temperature (abbreviated as STR, the same below) there will be a big difference. In many cases, it was also observed that the ratio of water vapor to carbon had a significant effect on the STR of the catalyst. Catalyst Z107 showed higher STR, and when the temperature was 800 ℃ or higher, part of the NiAl_2O_4 was formed. The reduced oxidized catalyst was also observed to have a dramatic decrease from its original value in the rereduction process. Only 450 ℃. Based on the experimental results and thermodynamic analysis, this paper presents the appearance of thin activity and local formation mechanism as well as the reduction reaction mechanism.