功能材料
功能材料
공능재료
JOURNAL OF FUNCTIONAL MATERIALS
2015年
z1期
67-70
,共4页
邢宇%薛莹莹%刘振新%吴德鹏%方少明
邢宇%薛瑩瑩%劉振新%吳德鵬%方少明
형우%설형형%류진신%오덕붕%방소명
钴%催化材料%复合材料%结构变化%费托合成
鈷%催化材料%複閤材料%結構變化%費託閤成
고%최화재료%복합재료%결구변화%비탁합성
cobalt%catalytic material%composite material%structural change%Fischer-Tropsch synthesis
钴系催化材料在费托合成中的反应已有较多研究文献,但对费托反应前后由于水热环境导致钴系催化材料发生结构变化的研究则很少.应用场发射扫描电子显微镜研究了3种新鲜制备的钴系复合催化材料的织构特征,应用粉末 X 射线衍射技术研究了费托反应前后3种钴系催化材料的结构变化;并且发现含有氧化铝成分的样品在经历费托反应的水热环境之后均在衍射角(2θ)为21.5和23.8°处出现新物相的衍射峰,即形成某种结晶性水合氧化铝;该新物相可能与被 H 2 O 氧化的钴物种发生反应生成无催化活性的CoAl2 O 4相而导致钴催化剂的衰减失活.
鈷繫催化材料在費託閤成中的反應已有較多研究文獻,但對費託反應前後由于水熱環境導緻鈷繫催化材料髮生結構變化的研究則很少.應用場髮射掃描電子顯微鏡研究瞭3種新鮮製備的鈷繫複閤催化材料的織構特徵,應用粉末 X 射線衍射技術研究瞭費託反應前後3種鈷繫催化材料的結構變化;併且髮現含有氧化鋁成分的樣品在經歷費託反應的水熱環境之後均在衍射角(2θ)為21.5和23.8°處齣現新物相的衍射峰,即形成某種結晶性水閤氧化鋁;該新物相可能與被 H 2 O 氧化的鈷物種髮生反應生成無催化活性的CoAl2 O 4相而導緻鈷催化劑的衰減失活.
고계최화재료재비탁합성중적반응이유교다연구문헌,단대비탁반응전후유우수열배경도치고계최화재료발생결구변화적연구칙흔소.응용장발사소묘전자현미경연구료3충신선제비적고계복합최화재료적직구특정,응용분말 X 사선연사기술연구료비탁반응전후3충고계최화재료적결구변화;병차발현함유양화려성분적양품재경력비탁반응적수열배경지후균재연사각(2θ)위21.5화23.8°처출현신물상적연사봉,즉형성모충결정성수합양화려;해신물상가능여피 H 2 O 양화적고물충발생반응생성무최화활성적CoAl2 O 4상이도치고최화제적쇠감실활.
There are many literature about the reactions of cobalt-based catalytic materials in Fischer-Tropsch synthesis (FTS).However,the literature about the structural changes of cobalt-based materials before and af-ter the FTS reactions due to the hydrothermal environments is sparse.This article applied FESEM to study the texture features of three freshly-prepared cobalt-based composite materials and employed powder XRD to inves-tigate the structural changes of the three cobalt-based catalytic materials.It was found that the samples contai-ning alumina will form the diffraction peaks of new species at 2θ of 21.5 and 23.8°,which might be some kind of crystalline hydrated alumina.This type of new species might react with the cobalt species formed by H 2 O oxida-tion and produce non-catalytic CoAl2 O 4 phase which was one cause of deactivation or decay of cobalt catalysts.