TITLE: Modified ferrisilicates for synthesis gas conversion. Final report.

AUTHOR: R. Szostak;   V. Nair.

INST.  AUTHOR: Georgia Tech Research Inst., Atlanta.

SPONSOR: Department of Energy, Washington, DC.

LANGUAGE: English

PUB.  TYPE: Technical Report

PUB.  COUNTRY: United States

SOURCE: Department of Energy [DE],  Jan 90,  564p.

NTIS ORDER NO.: DE90009553INW

ABSTRACT:

Iron silicate (or ferrisilicate) molecular sieves with the ZSM-5 structure have been synthesized with SiO(sub 2)/Fe(sub 2)O(sub 3) varying from 20 to infinity (specifically 20, 50, 90, and 200) utilizing techniques developed in our laboratory. These materials were subsequently modified using combined thermal and hydrothermal treatment which yielded novel bifunctional iron oxide containing molecular sieves. Detailed characterization, both physical and catalytic, revealed the presence of very small clusters of iron oxide highly dispersed within the pore system of the ZSM-5 crystal structure. The size of the clusters formed and their location within the pores was found to be very sensitive to the SiO(sub 2)/Fe(sub 2)O(sub 3) ratio of the parent material, the temperature, the time of hydrothermal treatment and the quality of the molecular sieve crystals. As synthesis gas catalysts, these properly prepared modified iron silicates were shown to be highly active despite their low iron content and exhibited the desired selectivity for production of C8 hydrocarbons. 228 refs., 108 figs., 37 tabs.

REPORT  NUMBER: DOE/PC/90007-T1

CONTRACT  NUMBER: AC22-86PC90007