Hydrogenation of Carbon Monoxide to Form Light Olefins over an Iron-modified Crystalline Silica

Abstract

Iron-modified crystalline silicas prepared from an Fe(II) compound were more active than those prepared from an Fe(III) compound. The (C2H4+C3H6) selectivity of the former was lower than that of the latter. By the addition of alkaline earth metals, the (C2H4+C3H6) selectivity of the catalysts prepared from the Fe(II) compound increased remarkably.

Direct catalytic conversion of synthesis gas to lower olefins

“…There is currently considerable interest in the use of zeolites both as a catalyst support and as a catalyst by itself for FT synthesis (Chang et al, 1979;Jacobs and van Wouwe, 1982;Melson et al, 1983; Rao and Gormley, 1980;Sano et al, 1985aSano et al, ,b, 1986). Their shape-selective character, in view of available molecular dimensions, may help to control the upper limits of molecular weight of the product, and their high surface area allows a high degree of metal dispersion.…”

“…The selectivity to C2H4 + C3H6 also increased in the order Sr < Mg < Ca < Ba. However, this effect was not observed with catalysts prepared from the Fe(III) compound (Sano et al, 1985a). The catalyst consisting of silicalite impregnated with Fe and promoted with K had a very high selectivity for the production of C2-C4 olefins (Table IV) (Rao and Gormley, 1980).…”

Hydrogenation Ability of ZSM-5 Zeolite.

“…Figure 9 shows the results of the hydroconversion of benzene over various M-HZSM-5 zeolites10) The catalytic activity of M-HZSM- 5 was lower than that of the HZSM-5 and decreased with the amount of alkaline earth metal.…”