摘要
根据作者动力学研究结果探讨了４６０～５５０℃，１．０１×１０５Ｐａ下Ｃ７Ｈ１６在国产Ｎｉ系催化剂上水蒸气转化过程中的积炭和随后水蒸气消炭的机理，提出了相应的机理及其表达式．认为积炭速率的决定步骤是吸附态的Ｃ７Ｈ１６在Ｎｉ表面的深度脱氢，消炭过程的决定步骤是须炭于浓度差推动下在Ｎｉ晶粒中的溶解扩散．提出了控制和消除Ｎｉ表面上须炭核的生成及长大是提高催化剂抗积炭性能的关键．
ccording to our research results on the kinetics, the mechanismabout coking and following decoking on a nickel catalyst for steam reforming of heptane under the pressure of 1.01×105 Pa and 460￣550℃has been explored, meanwhile the corresponding mechanism steps andtheir equations have been proposed. It is suggested that the step governing the coking rate is the deep dehydrogenation of the adsorbed heptane on Ni crystals, and the step governing the decoking rate is the resolution and diffusion of the fibre carbon on the Ni crystal propelled bythe carbon concentration difference between the front and the back surfaces of the Ni crystal. It is assumed that the key point for improvingthe anti-coking ability of Ni catalysts is to control and destroy the formaton and growth of the carbon fibre nuclei.
关键词
水蒸气
镍催化剂
积炭
消炭
机理
steam reforming catalyst, nickel catalyst,coking, steam decoking
