Co-Mo/γ-Al_2O_3耐硫脱氧催化剂的TPD-TPR研究  

TPD-TPR Study on Sulfur-tolerant Deoxidizing Catalyst Co-Mo/γ -Al_2O_3

作　　者：万江[1] 刘够生[2] 宋兴福[1] 于建国[1] 

机构地区：[1]华东理工大学资源与环境工程学院,上海200237 [2]江西科技师范学院应用化学系,江西南昌330013

出　　处：《高校化学工程学报》2005年第5期703-707,共5页Journal of Chemical Engineering of Chinese Universities

基　　金：中葡第四届科技混委会项目暨上海市国际合作项目(025207009)。

摘　　要：采用等体积浸渍法制备了Co-Mo/γ-Al2O3非贵金属耐硫脱氧催化剂,在实验室微反装置上进行了脱氧活性考评,利用程序升温脱附法(TPD)对该脱氧剂H2、O2的脱附行为进行了研究;同时,利用程序升温还原法(TPR)对新鲜样及中试失活样进行了研究。结果表明,在该催化剂上H2存在两个脱附峰,对应有两种吸附活化位;O2有四个脱附峰,对应有四种吸附活化位,水汽吸附会优先占据弱吸附活性位,从而抑制了其对H2和O2的活化吸附量。催化剂有三种耗氢还原峰,峰面积呈肥胖型,且在各个温度下都有还原,活性组份Co-Mo与Al2O3之间协同作用,直接影响着催化剂脱氧活性,新鲜样中的活性物种与载体间的作用要比失活样的强。研究结果对Co-Mo/γ-Al2O3非贵金属耐硫脱氧催化剂的使用、失活和再生有重要的意义。A sulfur-tolerant deoxidizing catalyst using Co-Mo non-noble metal as the active component and y-Al2O3 as the support was successfully prepared. The deoxidizing performance was measured in a fixed bed micro-reactor. Temperature-programmed desorption （TPD） was used to study the catalyst＇s desorption behavior of H2 and O2. Temperature-programmed reduction （TPR） was also applied to study the hydrogen consumption of fresh and deactivated catalyst samples. Results from TPD profiles show that, on this catalyst, H2 has two desorption peaks corresponding to two different active sites, O2 has four desorption peaks corresponding to four different active sites. Water vapour occupies weak active site in priority, thus withholding further H2 and O2 active absorptive capacity. Results of TPR show that this catalyst has three catalogues of hydrogen consumption peaks, peak areas are in obesity type, and this catalyst has reduction performance at various temperature. The synergistic reaction between Co-Mo and Al2O3 affects its deoxidizing activity, and this synergistic reaction in fresh catalyst is stronger than that in deactived catalyst. The results of this study are significant for the use, deactivation and reactivation of Co-Mo/y-Al2O3 deoxidizing catalyst.

关 键 词：非贵金属 Co-Mo/y-Al2O3催化剂 TPD TPR 耐硫脱氧剂 

分 类 号：O643.36[理学—物理化学]