TITLE: Cation Promotion Effects in Zeolite-Supported F-T Catalysts.

AUTHOR: J. G. Goodwin;   A. Sayari.

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 84,  21p.

ABSTRACT:

During this quarter a series of dealuminated NaY zeolites was studied by ESCA. NaY zeolite was dealuminated using an aqueous solution of H sub 4 EDTA. Changes in surface compositions and chemical states as a result of dealumination are reported. ESCA data indicated that aluminum and sodium are preferentially removed from the external surface of the zeolite during dealumination. This is presumably due to diffusional limitations of EDTA molecules into the internal cavities of the zeolite particles. It was found also that the Al/sub 2p/ binding energies of nafaujasite type zeolites are an increasing function of Al/Si ratios of the zeolites. This illustrates the effects of Madelung potential on the chemical states of the framework aluminum atoms. Adsorptive properties of dealuminated and alkali-exchanged zeolite were studied. Adsorption isobars of cyclopropane, cyclohexane and benzene have been performed in the temperature range 25 to 120 exp 0 C using a TGa system. The results were explained on the basis of variations of void volumes and heat of adsorption as well as chemical interactions. Several runs of CO hydrogenation have been carried out at atmospheric pressure over the following catalysts: 3% Ru/NaY; 1% Ru/20% dealuminated zeolite; 1% Ru/40% dealuminated zeolite; and 1% Ru/60% dealuminated zeolite. The main results and interpretation are presented. 15 references, 5 figures, 1 table. (ERA citation 09:037403)

REPORT  NUMBER: DOE/PC/60805-T3

CONTRACT  NUMBER: FG22-83PC60805