【摘要】 本文用动态热重装置对轻油转化制氢镍催化剂上水-氢混合消碳的动力学做了研究,得到了消碳的动力学经验方程,并与用水消碳的动力学做了比较,证明了水-氢混合消碳,除可以抑制水对催化剂的氧化、促进催化消碳外,还可以在一定温区内,通过用适当范围的水-氢比,使水-氢混合消碳的速度大于单用水消碳的速度。更多还原

【Abstract】 The kinetics study of elimination of carbonaceous deposits on steam reforming nickel catalysts with steam-hydrogen has been made in a dynamic ther-mogravimet ric reactor system. It has been shown that the oxidizing effect of steam on nickel catalysts can be inhibited by using steam-hydrogen mixture. Steady state rate of elimination versus the initial amount of carbon deposited Wc was determined.For Wc<10mg/100mg cat.,they are in linear proportion; for 10mg<Wc<25mg/100mgcat., the rate of elimination is proportional to the logarithm of the amount of carbon deposited.Different empirical equations of using steam alone and using steam-hydrogen mixture for two temperature regions were obtained.lt has been shown that carbon elimination with steam-hydrogen mixture not only keeps the nickel catalysts from being oxidized by steam but also enhances the rate of elimination in the low temperature region, provided that suitable H2O-H2 ratio is used.更多还原