两种转化催化剂上CH_4裂解反应考察

STUDY ON CH_4 PYROLYSIS REACTION CATALYZED WITH TWO TYPES OF CATALYSTS

采用程序升温表面裂解（ＴＰＳＣ）的方法研究了天然气转化催化剂Ｚ１０７和添加Ｌａ＿２Ｏ＿３助剂的Ｚ１１１催化剂及它们的载体上产生的ＣＨ＿４裂解过程。试验结果表明：ＣＨ＿４在催化剂载体上，温度低于８００℃不产生裂解，高于８００℃时，有微量裂解；ＣＨ＿４在催化剂上，裂解从２２０℃开始，３５０℃时，裂解速度增大，于５４０℃达到极大值，以后裂解速度迅速下降，当温度升至６００℃时，裂解速度降至极小值，温度再升高，裂解速度又有所回升。添加Ｌａ＿２Ｏ＿３的Ｚ１１１催化剂，其裂解峰值（５５５℃）速度比Ｚ１０７催化剂大３１％，其裂解反应活性比Ｚ１０７高１．８倍左右，其裂解速度下降较Ｚ１０７慢，要温度升至８００℃才降到极小值。

Use TPSC method to study CH_4 pyrolysis process on natural gas reforming catalysts2107 and Z111 with La_2O_3 promoter,as well as on their carriers. The experiment results are shown asfOllows:When the temperature is below 800℃ ,CH_4 isn't pyrolyzed on the catalyst carrier, and a tracedpyrolysis takes place when it is over 800℃. The pyrolysis of CH_4 on catalyst Z107 starts at 220℃,the rate of pyrolyzing increases when it comes to 350℃,and reaches its maximum at 540℃;then therate of pyrolysis drops sharply,till the temperature reaches 600℃ it goes down to the minimum;withthe temporature rising higher, the rate of pyrolysis goes up again to a certain degree。2111 with La_2O_3promoter has a higher rate peak to reach(at 555℃),31%more than Z107,its pyrolysis reaction activ-ity is around 1. 8 times higher than that of Z107 and its pyrolyzing rate dropo slower than that ofZ107. For its pyrolyzing rate to drop to the minimum,the temperature needs raising to 800℃。