TITLE: Micelle-derived catalysts for extended Schulz-Flory. Technical progress report, April 1, 1985--June 30, 1985.

INST.  AUTHOR: UOP, Inc., Des Plaines, IL. Signal UOP Research Center.

SPONSOR: Department of Energy, Washington, DC.

LANGUAGE: English

PUB.  TYPE: Technical Report

PUB.  COUNTRY: United States

SOURCE: Department of Energy [DE],  1985,  46p.

NTIS ORDER NO.: DE93003293INW

ABSTRACT:

A micelle procedure was established for preparing, in 30 g quantity, catalysts with ruthenium crystallites of specific size. A catalysts (4956-76) prepared by the micelle procedure and having 40--60 (Angstrom) ruthenium crystallites, according to the scanning transmission electron microscope (STEM) analysis, was tested in the Fischer-Tropsch fixed-bed pilot plant and showed significantly improved stability over catalysts for which the micelle technique has not been successfully applied. A hydrocarbon cut-off number was not observed, in the C(sub 1)-C(sub 180) carbon number range, with Catalyst 4956-76 containing 40--60 (Angstrom) ruthenium crystallites. Catalyst 4956-76 was reexamined with STEM after 248 hours of testing and did not display any noticeable change in the ruthenium crystallite size. Two new catalysts (4956-95 and 4956-97) were prepared with ruthenium crystallites of smaller size by the micelle procedure. Reverse micelle solutions with reverse micelles of smaller size were used for preparing these catalysts. Catalyst 4956497, with mostly 20--30 (Angstrom) ruthenium crystallites, is going to be evaluated to Determine the effect of ruthenium crystallite size on selectivity. X-ray diffraction (XRD) measurements were conducted on two ruthenium catalysts (1.1 and 1.7% Ru, by weight) prepared by a micelle technique, in order to confirm the narrow size distribution of ruthenium crystallites detected in the STEM examination. It was concluded that the XRD technique cannot be utilized to measure crystallite size distribution of (1--2 wt.% Ru) ruthenium on (gamma)-alumina because of the interference of the strong signal from the alumina support.

REPORT  NUMBER: DOE/PC/70023-T4

CONTRACT  NUMBER: AC22-84PC70023