天然气蒸汽转化催化剂抗积炭性能研究

Study on the Resistance to Carbon Deposition of Natural Gas Reforming Catalysts

用程序升温表面裂解和程序升温表面反应的方法研究转化催化剂上CH_4裂解和沉积炭与水汽反应过程。试验结果表明:在转化催化剂上,CH_4裂解从220℃开始,360℃时明显加速,540℃时(Z111在555℃)速度达极大值;添加稀土的Z111催化剂与Z107相比,其镍晶粒变小,对水吸附量、CH_4裂解极大速度和沉积炭与水反应极大速度分别显著增加了57％、45％和162％。

Use TPSC and TPSR method to study CH4 cracking and reaction of deposited carbon with water on reforming catalysts. The experiment results are shown. The cracking of CH4 on catalyst Z107 starts at 220℃ ,the rate of cracking increases when it comes to 360℃, and reaches its maximum at 540℃ (Z111 at 555℃), when the catalyt Zm(by the addition of RE2O3) was compared with Z107,the dispersions of both NiO and Ni for the former were increased. The total amount of adsorbed H2O, the maximum cracking rate of CH4 and the maximum reaction rate of deposited carbon with water considerably enhanced 57%,45%and 162% respectively.