TITLE: Cation Promotion Effects in Zeolite-Supported F-T Catalysts.  Seventh Quarterly Report, March 1985-May 1985.

AUTHOR: J. G. Goodwin;   R. Oukaci.

INST.  AUTHOR: Pittsburgh Univ., PA. Dept. of Chemical and Petroleum Engineering.

SPONSOR: Department of Energy, Washington, DC.

LANGUAGE: English

PUB.  TYPE: Technical Report

PUB.  COUNTRY: United States

SOURCE: Department of Energy [DE],  Jun 85,  8p.

NTIS ORDER NO.: DE85014770/INW

ABSTRACT:

An investigation into zeolite-supported F-T catalysts begun under Grant No. DE-FG22-81PC40774 (Office of Fossile Energy, DOE) has produced results which suggest that alkali cations, remaining in a zeolite and serving to neutralize the structure, act to promote higher hydrocarbon formation. It appears that the F-T metal must be highly dispersed throughout the zeolite in the vicinity of these cations for this promotion effect to take palce.  This effect is also highly dependent upon alkali cation concentration. The current research involves a study of the promotion effects of the neutralizing alkali cations on CO hydrogenation (under typical F-T conditions) over zeolite-supported Ru catalysts. A new series of ruthenium catalysts was prepared by the conventional ion exchange of Y zeolite containing various alkali cations (Li exp + , Na exp + , K exp + , Rb exp + , Cs exp + ). Prior to reduction with hydrogen, the decomposition of the Ru-hexammine complex was carried out under vacuum using a slow heating rate (0.5 K sec exp -1 ) up to 673 K. The samples were characterized by H sub 2 and CO chemisorption. Much higher and more comparable dispersions were found for most of the catalysts compared to those found after decomposition under flowing helium as discussed in previous reports.  Studies of CO hydrogenation at atmospheric pressure and 200 to 300 exp 0 C have begun using this new series of Ru-zeolite catalysts. 6 refs., 2 tabs.  (ERA citation 10:038941)

REPORT  NUMBER: DOE/PC/60805-T7

CONTRACT  NUMBER: FG22-83PC60805