Co-based catalyst for production of sulfur through reduction of SO2 in flue gas as well as preparation method and application of Co-based catalyst

A catalyst and flue gas technology, which is applied in the field of Co-based catalysts for producing elemental sulfur from flue gas SO2 and its preparation field, can solve the problems of poor activity, unsuitable for large-scale production, complicated preparation methods, etc.

Inactive Publication Date: 2017-09-19

INST OF PROCESS ENG CHINESE ACAD OF SCI

4 Cites 11 Cited by

AI-Extracted Technical Summary

Problems solved by technology

Mulligan et al. used pure crystalline MoS 2 , WS, FeS and supported MoS 2 /A1 2 o 3 Conducted research and found that MoS has higher selectivity than WS and FeS catalysts, and supported MoS 2 /A12O 3 than A1 2 o 3 Higher activity selectivity, but the preparation method is quite complicated and not suitable for large-scale pr...

Method used

As can be seen from the foregoing examples, the present invention is by the metal oxide of the active component Co loaded on carrier, and by its synergistic effect with auxiliary agent, described catalyst can be used for SO Reduction sulfur making It has high activity and high selectivity; and, the neutral component of the Co-based catalyst is uniformly dispersed, stable in performance and uniform in particle size, and is suitable for catalytic reduction of SO2 in flue gas in a fixed-bed reactor. Sulfur, so that the conversion rate of SO2 can reach more than 90%, and the selectivity can reach more than 90%.

The present embodiment provides a kind of evaluation method of described Co series catalyst, the 14%Co...

Abstract

The invention provides a Co-based catalyst for production of sulfur through reduction of SO2 in flue gas as well as a preparation method and an application of the Co-based catalyst. The catalyst comprises a supporter as well as an active component and an aid which are applied to the supporter, wherein the active component is oxide of Co, and the aid is one or at least two of oxides of Cu, Ni, La, Mg, Ca or Ba. The preparation method comprises the steps as follows: the active component and the aid are supported on the supporter with an equivalent-volume impregnation method, drying, roasting and vulcanization are performed, and the Co-based catalyst is prepared. The Co-based catalyst contains uniformly dispersed component, stable performance and uniform particle size and is applicable to catalysis of SO2 in the flue gas to produce sulfur in a fixed bed reactor.

Application Domain

Heterogenous catalyst chemical elementsDispersed particle separation +2

Technology Topic

Sulfur dioxideFlue gas +6

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Examples

Experimental program(8)

Example Embodiment

[0063] Example 1:

[0064] This embodiment provides a method for SO in flue gas 2 A Co-based catalyst for reducing sulfur production and a preparation method thereof, the method comprising the following steps:

[0065] (1) Weigh 15g of γ-Al with a fixed mesh 2 o 3 Granules, put into a small beaker, gradually drop deionized water, when the water is just fully impregnated γ-Al 2 o 3 Stop dripping water when the time comes, weigh and calculate the amount of water added, and determine 15g of carrier γ-Al 2 o 3 Water absorption 15.3g;

[0066] (2) Calculate and prepare 14wt% Co/γ-Al according to the mass of carrier 2 o 3 Co(NO 3 ) 2 ·6H 2 The amount of O, wherein 14% is the ratio of the mass of the metal oxide to the mass of the support. 8.16g of Co(NO 3 ) 2 ·6H 2 O was dissolved in 15.3mL of deionized water, stirred until completely dissolved to form the desired concentration of Co(NO 3 ) 2solution; then pour the solution into 15g of γ-Al 2 o 3 Put it in a small beaker of the carrier, and keep stirring, the carrier is just completely impregnated, and place it for 0.5h.

[0067] (3) Put the above catalyst in an oven at 110°C to dry for 6 hours, then place it in a muffle furnace and heat up to 500°C for 12 hours. After cooling, the γ-Al 2 o 3 catalyst precursor;

[0068] (4) Put the catalyst precursor into the tube furnace, under 10% H 2 S/H 2 Pre-sulfurize at 400°C for 1 hour, and then cool down to room temperature to obtain 14% Co/γ-Al with uniform particle size and uniform distribution of active components 2 o 3 catalyst.

[0069] Accurately weigh 1g of the catalyst, put it into the micro-reactor evaluation device for evaluation, after the exhaust gas test, calculate the SO 2 The conversion rate was 93.2%, and the selectivity was 90.5%.

Example Embodiment

[0070] Example 2:

[0071] This embodiment provides a method for SO in flue gas 2 A Co-based catalyst for reducing sulfur production and a preparation method thereof, the method comprising the following steps:

[0072] (1) Weigh 15g of γ-Al with a fixed mesh 2 o 3 Granules, put into a small beaker, gradually drop deionized water, when the water is just fully impregnated γ-Al 2 o 3 Stop dripping water when the time comes, weigh and calculate the amount of water added, and determine 15g of carrier γ-Al 2 o 3 Water absorption 15.3g;

[0073] (2) Calculate the preparation of 14% Co-4% Cu/γ-Al according to the mass of the carrier 2 o 3 Co(NO 3 ) 2 ·6H 2 O and Cu(NO 3 ) 2 ·3H 2 The amount of O. 8.16g of Co(NO 3 ) 2 ·6H 2 O and 1.82g of Cu(NO 3 ) 2 ·3H 2 Dissolve O in 15.3mL of deionized water, stir until it is completely dissolved to form an impregnation solution of the required concentration; then pour this solution into 15g of γ-Al 2 o 3 Put it in a small beaker of the carrier, and keep stirring, the carrier is just completely impregnated, and place it for 0.5h.

[0074] (3) Put the above catalyst in an oven at 110°C to dry for 6 hours, then place it in a muffle furnace and heat it up to 500°C for 12 hours. After cooling, the γ-Al 2 o 3 catalyst precursor;

[0075] (4) Put the catalyst precursor into the tube furnace, under 10% H 2 S/H 2 Pre-sulfurize at 400°C for 1 hour, then cool down to room temperature to obtain 14%Co-4%Cu/γ-Al with uniform particle size and uniform distribution of active components 2 o 3 catalyst.

[0076] Accurately weigh 1g of the catalyst, put it into the micro-reactor evaluation device for evaluation, after the exhaust gas test, calculate the SO 2 The conversion rate was 94.0%, and the selectivity was 96.1%.

Example Embodiment

[0077] Example 3:

[0078] This embodiment provides a method for SO in flue gas 2 A Co-based catalyst for reducing sulfur production and a preparation method thereof, the method comprising the following steps:

[0079] (1) Weigh 15g of γ-Al with a fixed mesh 2 o 3 Granules, put into a small beaker, gradually drop deionized water, when the water is just fully impregnated γ-Al 2 o 3 Stop dripping water when the time comes, weigh and calculate the amount of water added, and determine 15g of carrier γ-Al 2 o 3 Water absorption 15.3g;

[0080] (2) Calculate and prepare 14%Co-4%Cu-2%La/γ-Al according to the mass of the carrier 2 o 3 Co(NO 3 ) 2 ·6H 2 O, Cu(NO 3 ) 2 ·3H 2 O and La(NO 3 ) 3 ·6H 2 The amount of O. 8.16g of Co(NO 3 ) 2 ·6H 2 O, 1.82g of Cu(NO 3 ) 2 ·3H 2 O and 0.9352g of La(NO 3 ) 3 ·6H 2 O was dissolved in 15.3mL of deionized water and stirred until completely dissolved to form an impregnation solution of the desired concentration. Then pour the solution into the weighed 15g γ-Al 2 o 3 In the small beaker of the carrier, and keep stirring, the carrier is just completely impregnated, place for 0.5h;

[0081] (3) Put the above-mentioned catalyst in an oven at 100°C for 5 hours, then place it in a muffle furnace and heat it up to 450°C for 10 hours. After cooling, the γ-Al 2 o 3 catalyst precursor;

[0082] (4) Put the catalyst precursor into the tube furnace, under 10% H 2 S/H 2 Pre-sulfurize at 500°C for 4 hours, and then cool down to room temperature to obtain 14%Co-4%Cu-2%La/γ-Al with uniform particle size and uniform distribution of active components 2 o 3 catalyst.

[0083] Accurately weigh 1g of the catalyst, put it into the micro-reactor evaluation device for evaluation, after the exhaust gas test, calculate the SO 2 The conversion rate was 93.8%, and the selectivity was 96.5%.

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