Ferromanganese catalyst for Fischer-Tropsch synthesis and method for preparing the same

A Fischer-Tropsch synthesis, manganese catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as poor catalyst selectivity, and achieve high mechanical strength. , The effect of reducing the preparation cost and large specific surface area

Inactive Publication Date: 2003-12-31
SYNFUELS CHINA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rao et al. have announced the patent (US Patent4,340,503) of the supported iron catalyst containing potassium promoter, SiO 2 As a carrier, the loading of iron is 5-25%wt, but the selectivity of the catalyst is poor, at 280°C, 1000h -1 , 2.0MPa, raw material gas H 2 C when / CO ratio is 2.0 2-4 ＝ / C 2-4 0 The ratio is only 0.5, and the weight selectivity of methane is as high as 18.6-25.5%. 5 + The weight selectivity is also only 41.8-45.6%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh Fe(NO 3 ) 3 9H 2 O6 20.0 g, 50%wt Mn(NO 3 ) 2 Solution 45.1 g, Ca(NO 3 ) 2 4H 2 O54.5 grams, with deionized water to prepare a mixed solution with a total concentration of 0.9 mol / liter, the mixed salt solution is placed in a 90 ° C water bath for preheating, and the prepared concentration is 0.50 mol / liter of ammonia solution, preheated in a 60 ° C water bath hot. Fill the four-neck round low flask with 100mL ammonia solution with a pH value of 9 in advance, and immerse the round bottom flask in a 90°C water bath. During the stirring process, slowly drop the above ammonia solution and salt solution into the flask at the same time, and the whole precipitation process The temperature of the system was kept at 90°C, the pH value was 9.0, and the precipitation process took about 1 hour. After the precipitation is completed, let it stand for aging for 15 hours, and filter. In the filter cake, directly add 31.0 grams of silica sol (SiO 2 Weight percent comp...

Embodiment 2

[0032] As described in Example 1, Fe(NO 3 ) 3 9H 2 O6 20.0 g, 50%wt Mn(NO 3 ) 2 Solution 140.0 g, Ca(NO 3 ) 2 4H 2 O11.0 g, use deionized water to prepare a mixed solution with a total concentration of 0.2 mol / liter, place the mixed salt solution in a 75°C water bath to preheat, prepare an ammonia solution with a concentration of 2.7 mol / liter, and place it in a 60°C water bath warm up. Precipitate according to the precipitation method described in Example 1 under the conditions of 75° C. and pH 8.0, and the precipitation process takes about 0.8 hours. After the precipitation is completed, let it stand for aging for 12 hours, and filter. Add 64 grams of silica sol (SiO in silica sol) simultaneously in the gained filter cake 2Weight percent composition is 9.5%), 750mL deionized water, and 10mL concentration is the potassium carbonate solution of 0.75 mol / liter, beating. The slurry was evaporated to dryness in an 85°C water bath (48 hours). Then dry at 120°C for 12 ho...

Embodiment 3

[0034] As described in Example 1, Fe(NO 3 ) 3 9H 2 O6 20.0 g, 50%wt Mn(NO 3 ) 2 Solution 80.0 g, Ca(NO 3 ) 2 4H 2 O29.0 g, use deionized water to prepare a mixed solution with a total concentration of 0.6 mol / liter, place the mixed salt solution in a 55°C water bath to preheat, prepare an ammonia solution with a concentration of 2.0 mol / liter, and place it in a 50°C water bath warm up. Precipitate according to the precipitation method described in Example 1 under the conditions of 55° C. and pH 8.5, and the precipitation process takes about 0.8 hours. After the precipitation is completed, let it stand for aging for 16 hours, and filter. Add 102.35 grams of silica sol (SiO in silica sol) simultaneously in the gained filter cake 2 Weight percent composition is 15%), 850mL deionized water, and 46mL concentration is the potassium carbonate solution of 0.75 mol / liter, beating. The slurry was evaporated to dryness in an 80°C water bath (50 hours). Then dry at 120°C for 12...

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PUM

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Abstract

The catalyst for Fischer-Tropsch synthesis has the atom makeup of Fe 100, Mn 4-100, Ca 2-50 and K 0.2-10; and is prepared with precursors and through precipitation process. The present invention hasthe advantages of large specific surface area, high strengthen, low cost, high conversion rate and high selectivity.

Description

Technical field: [0001] The invention relates to an iron / manganese catalyst and a preparation method thereof, in particular to an iron / manganese catalyst for Fischer-Tropsch synthesis and a preparation method thereof. Background technique: [0002] Iron-based catalysts are the most commonly used type of Fischer-Tropsch synthesis catalysts. Because of their high water-gas shift activity, they are especially suitable for Fischer-Tropsch synthesis reactions using coal-based synthesis gas with low hydrogen-to-carbon ratios as raw materials. At present, the Sasol company in South Africa, which has successfully realized the large-scale industrial operation of Fischer-Tropsch synthesis, uses an iron-based catalyst (M.E.Dry et al, Catalysis Today, 1990, 6(3)183-206). [0003] Van Dijk, Jenson, Maiti et al. (Applied Catalyst, 1982, 2, 273-298; J of Catalysts, 1985, 92, 98-108; Applied Catalyst, 1982, 16 (2), 215-225) and Arakawa et al. ( Ind.Eng.Chem.Process Des.Dev.1983, 22,97-103)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889C07C1/04
Inventor 相宏伟杨勇李永旺白亮钟炳
Owner SYNFUELS CHINA TECH CO LTD
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