TITLE: Moessbauer Spectroscopic and Related Characterization of Fischer-Tropsch Catalysts. Final Report.

AUTHOR: L. N. Mulay.

INST.  AUTHOR: Pennsylvania State Univ., University Park. Materials Research Lab.

SPONSOR: Department of Energy, Washington, DC.

LANGUAGE: English

PUB.  TYPE: Technical Report

PUB.  COUNTRY: United States

SOURCE: Department of Energy [DE],  Aug 82,  31p.

ABSTRACT:

This work was undertaken using Moessbauer spectroscopy to characterize supported iron catalysts such as Fe/ZSM-5, Fe/Silicalite, and Fe/Mordenite in the synfuel gas reaction. The conclusions are as follows: (1) The catalysts prepared using Fe sub 3 (CO) sub 12 impregnation on ZSM-5 showed gamma -Fe sub 2 O sub 3 with better dispersion and smaller particle size which led to high surface area. (2) The H sub 2 flow rate varied the Fe sub 3 O sub 4 content at the reduction stage. Under normal reduction conditions, the reduction is completed in two hours. High H sub 2 flow is suggested in order to obtain complete reduction. (3) The carbided catalyst with carbonyl impregnation showed no phase change in the synfuel gas reaction. This confirmed that the catalysts were very stable and the activity obtained from PETC samples at 300 exp 0 C was mainly due to the temperature effect. (4) Low activity of iron on Mordenite catalyst resulted possible from the extensive oxidation of the carbided catalyst. (5) The catalysts prepared using Fe sub 3 (CO) sub 12 impregnation on  Mordenite with various SiO sub 2 /Al sub 2 O sub 3 ratio showed gamma -Fe sub 2 O sub 3 with various isomer shift arising from the change of chemical environment. This is an evidence of strong metal support interaction (SMSI) due to the acidity of the catalyst support. 9 references, 17 figures, 3 tables. (ERA citation 09:002070)

REPORT  NUMBER: DOE/PC/41265-T1

CONTRACT  NUMBER: AC22-81PC41265