化学通报（网络版）
化學通報（網絡版）
화학통보（망락판）
Chemistry Online
2003年
1期
,共1页
郑泉兴%陈颖%王琪%李一农%林仁存%方维平%杨意泉*
鄭泉興%陳穎%王琪%李一農%林仁存%方維平%楊意泉*
정천흥%진영%왕기%리일농%림인존%방유평%양의천*
Co-Mo/MgO-Al2O3催化剂%镁铝尖晶石%水煤气变换%XPS
Co-Mo/MgO-Al2O3催化劑%鎂鋁尖晶石%水煤氣變換%XPS
Co-Mo/MgO-Al2O3최화제%미려첨정석%수매기변환%XPS
Co-Mo/MgO-Al2O3 catalyst%MgAl2O4 spinel%Water gas shift%XPS
以混合煅烧法制备了水煤气变换催化剂CoO-MoO3/MgO-Al2O3,对硫化态催化剂及参比样(MoO3/Al2O3,CoO/Al2O3和MoO3/MgO-Al2O3)进行XPS表征.结果显示,钼物种含Mo6+、Mo5+和Mo4+混合价态;添加MgO或CoO助剂后,Mo6+物种含量减少,Mo5+和[S-S]2-物种浓度增加,催化剂低温活性得到提高(在200°C时CO转化率达99%).其催化反应过程可能按Mo4+~Mo5+氧化还原机理进行.
以混閤煅燒法製備瞭水煤氣變換催化劑CoO-MoO3/MgO-Al2O3,對硫化態催化劑及參比樣(MoO3/Al2O3,CoO/Al2O3和MoO3/MgO-Al2O3)進行XPS錶徵.結果顯示,鉬物種含Mo6+、Mo5+和Mo4+混閤價態;添加MgO或CoO助劑後,Mo6+物種含量減少,Mo5+和[S-S]2-物種濃度增加,催化劑低溫活性得到提高(在200°C時CO轉化率達99%).其催化反應過程可能按Mo4+~Mo5+氧化還原機理進行.
이혼합단소법제비료수매기변환최화제CoO-MoO3/MgO-Al2O3,대류화태최화제급삼비양(MoO3/Al2O3,CoO/Al2O3화MoO3/MgO-Al2O3)진행XPS표정.결과현시,목물충함Mo6+、Mo5+화Mo4+혼합개태;첨가MgO혹CoO조제후,Mo6+물충함량감소,Mo5+화[S-S]2-물충농도증가,최화제저온활성득도제고(재200°C시CO전화솔체99%).기최화반응과정가능안Mo4+~Mo5+양화환원궤리진행.
The catalyst CoO-MoO3/MgO-Al2O3 for water gas shift reaction was prepared by means of mixed calcinations. The sulfurized catalyst prepared and contrast ones (MoO3/Al2O3, CoO/Al2O3 and MoO3/MgO-Al2O3) were characterized by using XPS technique. The results show that the state of Mo species on the catalyst samples coexist as Mo6+, Mo5+ and Mo4+. The content of the Mo6+ species decrease after the addition of the promoter MgO or CoO to the catalyst and the contrast ones, but the concentration of Mo5+ and [S-S]2- increase, and the catalytic activity at low temperature was found to be improved (99% of Co conversion at 200°C being found).The pathway of the catalytic reaction may follow the mechanism Mo4+~Mo5+.
