Fischer-tropsch catalyst comprising cobalt, magnesium and precious metal
a catalyst and precious metal technology, applied in the field of cobalt catalysts, can solve the problems of poor relative activity of all magnesium-containing catalysts, rapid deactivation at high temperatures in use, etc., and achieve the effect of increasing the activity and stability of the fischer tropsch reaction
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example 1
Preparation of Catalyst Precursors
[0041]a) Support.
[0042]A commercially available transition alumina powder (Puralox 100 / 150) was impregnated using an incipient wetness method with an aqueous solution of magnesium nitrate hexahydrate (MgNHH). The damp material was then spread onto a stainless steel tray, and calcined in air at 550° C. for 5 hours with a 5° C. / min ramp rate. Three modified supports were made, nominally with 0.5% wt Mg, 3% wt Mg and, for comparison, 6% wt Mg.
[0043]The amounts used were:
[0044]Example 1a: 0.5% Mg−39.6 g Puralox 100 / 150, 2.7 g MgNHH, 42.5 mL deionised water.
[0045]Example 1b: 3% Mg−38.5 g Puralox 100 / 150, 15.9 g MgNHH 32.5 mL of deionised water.
[0046]Comparative A: 6% Mg−36.9 g Puralox 100 / 150, 31.6 g MgNHH, 20.8 mL deionised water.
[0047]b) Catalyst Precursors.
[0048]All three modified supports were co-impregnated with aqueous solutions of cobalt nitrate hexahydrate (CoNHH) and ruthenium nitrosyl nitrate (RuNN) by incipient wetness to produce catalyst prec...
example 2
Catalyst testing
[0050]a) Varied GHSV.
[0051]Catalysts were tested by placing about 0.134 g of each precursor within a cell of a micro-reactor test unit. The catalysts were reduced at 425° C. in a H2 and Ar flow, and then the temperature was reduced to 160° C. At this point CO was introduced to form a syngas mixture with a H2:CO ratio of 2:1, the pressure was set at 20 bar, and then the temperature was raised gradually using a ramp of 0.1° C. / min to 210° C. The catalytic test was started using a flow rate of 30 mlN / min syngas through each cell. The temperatures were increased from 210° C. to 230° C. and 240° C. and the syngas flowrate adjusted at 230° C. and 240° C. to obtain a conversion above 40% at 230° C. The summaries of the experimental results obtained are presented in the following tables. The values of conversion, Selectivity to CH4 and Selectivity to C5+ presented in these tables are obtained by averaging the experimental values over the stated interval. A conversion stabili...
example 1a
[0052]
Flow S S GHSV / Temp / rate / Conv / CH4 / C5+ / Pressure / Interval / (ml / ° C.ml / min%%%barh(gcat*h)2103017.48.3579.9420103-120133732303070.63.9590.8620129-144133732305040.887.0784.8520147-167222882406062.886.8886.420196-219267462103014.599.0478.5920237-27113373
Conversion stability=0.84
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