Ht-XRD, DSC and X-ray microprobe analysis of Cu and Al promoted Fe/MgO

Geometric Factors in K and Al Promoting of the Fe/MgO Fischer-Tropsch Catalyst

“…During the reaction, the Fe3C>4 phase was found to be unchanged for a certain stabilization effectof Al (Putanov etal., 1992c). This effect was attributed to the "skin" effect of Al, as was supposed earlier for the same catalyst (Boskovic et al, 1991). A uniform distribution of Al (Figure 6b) and the BET surface area decrease (Table 5) speak in favor of the promoter model, where Al at the same time acts as a "spacer" between the iron surfaces, and as a "cover" of part of the iron oxide.…”

“…In the present work, the activity and selectivity of the Fe/MgO catalyst, promoted by K and Al, were investigated at atmospheric pressure with the accent on olefin and isomer selectivity of the lower hydrocarbons (up to six C atoms). The results were correlated to the catalytic and physicochemical properties previously obtained for the same catalysts (Guczi et al, 1991; Boskovic et al, 1991;Putanov et al, 1992a-c).…”

“…In our previous works (Guczi et al, 1991;Putanov et al, 1992a) the influence of different promoters on the Fe/ MgO catalyst was investigated under elevated pressure, by catalytic reaction experiments designed to alcohol production. The observed catalytic behavior was connected to both changes of the state of the Fe component and the changes of textural properties of the catalyst (Boskovic et al, 1991;Putanov et al, 1992b,c). In the present work, the activity and selectivity of the Fe/MgO catalyst, promoted by K and Al, were investigated at atmospheric pressure with the accent on olefin and isomer selectivity of the lower hydrocarbons (up to six C atoms).…”