Sasol Technology Proprietary Limited

Sasol Technology (pty) Limited

Michael Steven Datt

Jacobus Lucas Visagie

Jan Van De Loosdrecht

Jan Mattheus Botha

Abdool Muthalib Saib

Johannes Gerhardus Koortzen

Alta Bohmer

Jacobus Lucus Visagie

A process for preparing a cobalt based Fischer-Tropsch synthesis catalyst precursor includes introducing a multi-functional carboxylic acid having the general formula (1) HOOC&#x2014;C*RC*R&#x2014;COOH (1) or a precursor thereof, where C* in each of C*Ri and C*R2 is a spcarbon, and Rand Rare the same or different, and are each selected from the group consisting of hydrogen and an organic group, into and/or onto a particulate catalyst support. The ratio of the quantity of multifunctional carboxylic acid used relative to the support surface area is at least 0.3 &#x3bc;mol carboxylic acid/mof support surface area. Simultaneously with the introduction of the carboxylic acid into and/or onto the catalyst support, or subsequent thereto, a cobalt compound is introduced into and/or onto the catalyst support. The impregnated support is calcined to obtain the cobalt based Fischer-Tropsch synthesis catalyst precursor.

Catalysts

A process for producing a supported cobalt-based Fischer-Tropsch synthesis catalyst includes, in a first activation stage, treating a particulate catalyst precursor with a reducing gas, at a heating rate, HR1, until the precursor has reached a temperature, T, where 80&#xb0; C.&#x2266;T&#x2266;180&#xb0; C., to obtain a partially treated precursor. In a second activation stage, the partially treated precursor is treated with a reducing gas, at an average heating rate, HR2, with x step increments, where 0&#x3c;HR2&#x3c;HR1, for a time, t, where tis from 0.1 to 20 hours, to obtain a partially reduced precursor. Thereafter, in a third activation stage, the partially reduced precursor is treated with a reducing gas, at a heating rate, HR3, where HR3&#x3e;HR2 until the partially reduced precursor reaches a temperature, T. The partially reduced precursor is maintained at Tfor a time, t, where tis from 0 to 20 hours, to obtain an activated catalyst.

A process for producing a supported cobalt-based Fischer-Tropsch synthesis catalyst includes, in a first activation stage, treating a particulate catalyst precursor with a reducing gas, at a heating rate, HR1, until the precursor has reached a temperature, T, where 80&#xb0; C.&#x2266;T&#x2266;180&#xb0; C., to obtain a partially treated precursor. In a second activation stage, the partially treated precursor is treated with a reducing gas, at a heating rate, HR2, where 0&#x2266;HR2&#x3c;HR1, for a time, t, where tis from 0.1 to 20 hours, to obtain a partially reduced precursor. Thereafter, in a third activation stage, the partially reduced precursor is treated with a reducing gas, at a heating rate, HR3, where HR3&#x3e;HR2 until the partially reduced precursor reaches a temperature, T. The partially reduced precursor is maintained at Tfor a time, t, where tis from 0 to 20 hours, to obtain an activated catalyst.

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Johannesburg, South Africa

Michael Steven Datt