Sasol Technology (Pty) Limited

Matthys Josephus Janse Van Vuuren

Johannes Jacobus Huyser

Ryno Kotze

Riaan Bekker

This invention relates to the field of Fischer-Tropsch catalysis, in particular to activation of a Fischer-Tropsch catalyst. More particularly the invention relates to a method of activating an iron based Fischer-Tropsch catalyst which includes iron in a positive oxidation state by contacting in a reactor said iron based catalyst with a reducing gas selected from the group consisting of CO and a combination of Hand CO; at a temperature of at least 245&#xb0; C. and below 280&#xb0; C.; at a reducing gas pressure of above 0.5 MPa and not more than 2.2 MPa; and at a GHSV of total gas fed to the reactor of at least 6000 ml(N)/g cat/h, thereby reducing the iron that is in a positive oxidation step in the catalyst.

Method of activating a Fischer-Tropsch catalyst

This invention relates to a Fischer Tropsch process using a catalyst activated in accordance with the invention. More particularly the invention relates to a three phase Low Temperature Fischer Tropsch process wherein CO and Hare converted to hydrocarbons and possibly oxygenates thereof by contacting syngas including CO and Hin the presence of an iron based Fischer Tropsch catalyst, wherein the ratio of H:CO in the feed is between 2.5 and 1, and wherein the iron based Fischer Tropsch catalyst is activated according to the steps of: (a) providing an iron catalyst including iron in a positive oxidation state; and (b) contacting the iron catalyst in a reactor with a reducing gas selected from CO and a combination of Hand CO; at a temperature of at least 245&#xb0; C. and below 280&#xb0; C.; at a reducing gas pressure of above 0.5 MPa and not more than 2.2 MPa; and at a GHSV of total gas fed to the reactor of at least 6000 ml(N)/g cat/h, thereby reducing the iron that is in a positive oxidation step in the catalyst.

Hydrocarbon synthesis process

This invention relates to a hydrocarbon synthesis process. More particularly, but not exclusively, this invention relates to a Fischer Tropsch Process employing an activated catalyst and to the use of such an activated catalyst, wherein the Fischer Tropsch Process conditions favor the attainment of a low acid selectivity. More particularly the invention relates to a three-phase low temperature Fischer Tropsch (LTFT) process wherein a feed of Hand CO are converted to hydrocarbons and possible oxygenates thereof by contacting the Hand CO in the presence of an iron-based Fischer Tropsch catalyst in a reaction zone, wherein the molar ratio of H:CO in the feed is from 0.5 and less than 1.0 and wherein the iron-based Fischer Tropsch catalyst is activated according to the steps of: (a) providing an iron-based catalyst including iron in a positive oxidation state; and (b) contacting the iron-based catalyst in a reactor with a reducing gas selected from CO and a combination of Hand CO; at a reduction temperature of at least 245&#xb0; C. and below 280&#xb0; C.; at a reducing gas pressure of above 0.5 MPa and not more than 2.2 MPa; and at a GHSV of total reducing gas fed to the reactor of at least 6000 ml(N)/g cat/h, thereby reducing the iron that is in a positive oxidation step in the catalyst.

A three-phase low temperature Fischer-Tropsch (LTFT) process wherein CO and Hare converted to hydrocarbons and possibly oxygenates thereof by contacting the CO and Hwith an iron-based Fischer-Tropsch catalyst in a LTFT reactor in the presence of an acid which is introduced into the LTFT reactor.

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Sasolburg, South Africa

Matthys Josephus Janse Van Vuuren