TITLE: Moessbauer spectroscopy studies of iron-catalysts used in Fischer-Tropsch (FT) processes. Quarterly technical progress report, January--March 1996.

AUTHOR: G. P. Huffman;   K. R. P. Rao.

INST.  AUTHOR: Kentucky Univ., Lexington.

SPONSOR: Department of Energy, Washington, DC.


PUB.  TYPE: Technical Report

PUB.  COUNTRY: United States

SOURCE: Department of Energy [DE],  1996,  17p.



Texas A and M University has been developing Fischer-Tropsch catalysts which are active at a low H(sub 2)/CO ratio of 0.67. It is of interest to find out any relationships that may exist between the iron phases that are produced during activation and FT synthesis and the activity of the catalysts. Moessbauer spectroscopy investigations were carried out on 13 iron-based catalysts during the period under review. The catalysts were taken from fixed bed reactors at the end of the tests. All the catalysts were mixed with glass beads. The glass beads were removed to a large extent by a hand held magnet. For each run, samples were taken from both top and bottom of the reactor to find out whether there are any differences between the two samples taken from different regions of the reactor. The catalysts with 24 parts of SiO(sub 2) were reduced with H(sub 2) at 250C for 24h, and the catalysts with 16 parts of SiO(sub 2) were reduced with H(sub 2) at 240C for 2h. All the test were carried out at 250C, 200 psig, 2.0nL(syngas)/g-cat/h with H(sub 2)/CO feed ratio of 0.67.  The compositions of the catalysts studied are given in a table. Three catalysts consisted of Ca in addition to Cu and K.