稀土镍催化剂的活性稳定性与组分相互作用的研究

对比考察了天然气水蒸汽转化稀土镍催化剂的活性稳定性。对催化剂上炭分析结果表明，未加稀土的镍催化剂活性衰减快的原因，主要是催化剂表面积炭覆盖了镍活性中心。催化剂中组分相互作用的研究表明，新物相形成的易难程度为：ＬａＮｉＯ３（Ｌａ２ＮｉＯ４）＞ＬａＡｌＯ３＞ＬａＮｉＡｌ（１１）Ｏ（１９）。研究结果还表明，在工业转化管的下部不必使用含稀土的镍催化剂。

Investigation on activity stability of Ni-RE catalyst and interaction between components

The activity stability of Ni-catalyst promoted with rare earth for steam-natural gas reforming was comparatively determined.Analytical results of coke and /or carbon suggest that the activity decay for Ni-catalyst unpromoted with rare earth is attributed to that the active nickel sites on the catalyst surface are covered with coke and /or carbon. Investigation on interaction between components in catalyst system indicates that the order of formation of new phases is LaNiO3 (LaNiO4)>LaAlO3>LaNiAl(11)O(19). The results show that it is unnecessary to use Ni-catalyst contailning rare earth at the lower half of the industrial reforming tube.