摘要
作者应用一种新的方法,金属蒸气法,制备了负载金属催化剂Fe_n/MgO-400.对其进行了TEM,XRD,Mossbauer和化学吸附测定.TEM,XRD和化学吸附结果表明该催化剂Fe_n平均粒度很小(<1.7nm),分散度极高.Mossbauer谱表明Fe_n原子簇以零价态存在.作者还研究了Fe_n/MgO-400在F-T反应中的催化性质。
A new method, the metal vapor method, was employed to prepare supported metal catalyst Fcn/ MgO-400. The iron atom precursor complex bis(tolucnc)iron(O) formed in the metal atom reactor was transfcrcd and impregnated (- 78℃) into the MgO dchydroxylatcd at 400℃, followed by removal of the toluene under vacuum. Catalyst Fcn/MgO-400 prepared in this way was characterized by TEM, XRD, Mossbaur and chcmisorption techniques, The results of TEM, XRD, and chcmisorption were in good agreement with each other and indicated the a-vcrage size of Fcn particles was quite small (<1.7nm) and the dispersion was very high Mossbaucr measurement showed Fcn clusters were in a zcrovalcnt state, thus indicating that no oxidation occurred during the preparation. The catalytic properties of Fen/ MgO-400 in the Fischer-Tropsch reaction were also studied. The preliminary results showed that the activity of this catalyst for F-T catalysis began around 230℃ at 1 atm pressure and increased as the reaction temperature rose. The resultant hydrocarbon distribution does not obey Schulz-Flory behaviour. A relative higher selectivity for C2, C3 hydrocarbons was observed.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
1991年第2期219-223,共5页
Chinese Journal of Inorganic Chemistry
关键词
催化剂
金属
金属蒸气合成
metal vapor synthesis, supported metal catalyst, dispersion Fisher-Tropsch reaction
