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The Fe/AlPO_4-5 catalyst is prepared by a new method,SMAI,andcharacterized by XPS,ESR and magnetic measurement techniques.The sur-face active phase iron exists as Fe~0 and its average diameter is below 4.0 nm.The catalyst has high activity and selectivity for light hydrocarbons in CO hy-drogenation.Moreover,the catalyst has a higher stubility.TPSH,Mossbauerand XPS are used to characterize the used catalyst.The results show that thesurface phases of used catalyst are mainly iron carbides,and only a smallamount of graphitic surface deposit is detected.The main reason of the deacti-vation is the accumulation of iron particles,not the deposit of the graphite.Thecatalytic properties of SMAI catalysts are attributed to the special prepartionmethod and unique crystal structure and chemical composition of AIPO_4-5molecular sieves.
The Fe / AlPO 4 -5 catalyst is prepared by a new method, SMAI, and characterized by XPS, ESR and magnetic measurement techniques. The sur-face active phase iron exists as Fe ~ 0 and its average diameter is below 4.0 nm. The catalyst has high activity and selectivity for light hydrocarbons in CO hy-drogenation. Moreover, the catalyst has a higher stubility. TPSH, Mossbauerand XPS are used to characterize the used catalyst. The results show that the surface phase of used catalysts are mainly iron carbides, and only a smallamount of graphitic surface deposit is detected. The main reason of the deacti-vation is the accumulation of iron particles, not the deposit of the graphite. catalysis properties of SMAI catalysts are attributed to the special prepartion mechanism and unique crystal structure and chemical composition of AIPO_4-5molecular sieves.