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Coking oven gas hydrodesulfurization catalyst and method for preparing same

A hydrodesulfurization and catalyst technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc. High temperature and other problems, to achieve the effect of uniform distribution of active components, high utilization rate and stable performance

Active Publication Date: 2010-08-11
WUHAN KELIN FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] Coke oven gas contains approximately 8% CO and 3% CO 2 , when the Co-Mo catalyst is used in this environment, it is easy to cause strong exothermic reactions such as methanation and CO disproportionation and carbon deposition. The heat released by these reactions will cause the bed temperature to soar, the working conditions fluctuate violently, and the service life of the catalyst is short
At present, the hydrodesulfurization of coke oven gas generally uses the Fe-Mo / γ-Al developed in my country 2 o 3 Catalyst, because during the use of this catalyst, the methanation reaction and CO disproportionation carbon deposition reaction are relatively less, but the catalytic effect of Fe on Mo is weak, and Fe-Mo / γ-Al 2 o 3 The hydrodesulfurization rate of the catalyst is only about 60%, and the use temperature is high, ranging from 350°C to 420°C, and the activity of the catalyst is also unstable

Method used

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  • Coking oven gas hydrodesulfurization catalyst and method for preparing same
  • Coking oven gas hydrodesulfurization catalyst and method for preparing same
  • Coking oven gas hydrodesulfurization catalyst and method for preparing same

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preparation example Construction

[0013] The preparation method of catalyst of the present invention comprises the following steps:

[0014] 1) Select the formed γ-Al 2 o 3 carrier, drying it at 120°C for 2 to 10 hours;

[0015] 2) Take a certain amount of ammonium molybdate and dissolve it in deionized water, add a certain amount of organic acid under constant stirring, then add cobalt salt, and finally add iron salt to obtain an impregnation solution; the organic acid can be Citric acid, lactic acid or tartaric acid, preferably citric acid. The cobalt salt and iron salt can be nitrate, carbonate or acetate, preferably nitrate. The molar ratio of Mo, Fe, Co and organic acid in the prepared immersion solution A is (14-55): (10-50): (0.5-24): (19-57).

[0016] 3) Immerse the carrier obtained in step 1) into the impregnating solution prepared in step 2) by equal impregnation method for 2 to 12 hours, then dry at 120°C, and then bake at 500°C for 2 to 4 hours to obtain Coke oven gas hydrodesulfurization cata...

Embodiment 1

[0026] 1) Weigh γ-Al dried at 120°C for 2 to 10 hours 2 o 3 Carrier 100g, spare;

[0027] 2) Weigh 24.5g of ammonium molybdate and dissolve it in 50ml of deionized water, add 30g of citric acid under constant stirring, then add 0.35g of cobalt nitrate, and finally add 25.3g of iron nitrate to prepare impregnation solution A, wherein Mo , Fe, Co, the molar ratio of organic acid is 55: 25: 2.4: 57;

[0028] 3) Immerse the carrier obtained in step 1) into the impregnation solution A in step 2) for 2 to 12 hours, then dry at 120°C, and then roast at 500°C for 2 to 4 hours to obtain catalyst FC-1, The mass fractions of molybdenum oxides, iron oxides, and cobalt oxides are 20%, 5%, and 0.5%, respectively.

Embodiment 2

[0030] 1) Weigh γ-Al dried at 120°C for 2 to 10 hours 2 o 3 Carrier 100g, spare;

[0031] 2) Weigh 6.13g of ammonium molybdate and dissolve it in 50ml of deionized water, add 10g of citric acid under constant stirring, then add 0.35g of cobalt nitrate, and finally add 10.1g of iron nitrate to prepare impregnation solution A, wherein Mo , Fe, Co, the molar ratio of organic acid is 14: 10: 0.5: 19;

[0032] 3) impregnating the carrier obtained in step 1) into the impregnation solution A obtained in step 2) for 2 to 12 hours, then drying at 120°C, and then roasting at 500°C for 2 to 4 hours to obtain a catalyst precursor;

[0033] 4) Weigh 0.013g of cesium nitrate and add it to 60ml of deionized water to make impregnating solution B;

[0034] 5) Add the catalyst precursor obtained in step 3) into the impregnation solution B prepared in step 4) for immersion for 2 to 12 hours, then dry at 120°C, and then roast at 600°C for 2 to 4 hours to obtain Catalyst FC-2, wherein the mass...

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Abstract

The invention discloses coking oven gas hydrodesulfurization catalyst and a method for preparing the same. The coking oven gas hydrodesulfurization catalyst is prepared by loading active components on the carrier of Gamma-Al2O3 with the immersion method. The active components comprises iron oxide, molybdenum oxide and cobalt oxide, wherein the weight of the iron oxide is 2-10 percent of the totalweight of the coking oven gas hydrodesulfurization catalyst, the weight of the molybdenum oxide is 5-20 percent of the total weight of the coking oven gas hydrodesulfurization catalyst, the weight ofthe cobalt oxide is 0.1-5 percent of the total weight of the coking oven gas hydrodesulfurization catalyst, and the balance is Gamma-Al2O3. The coking oven gas hydrodesulfurization catalyst has the characteristic of high hydrodesulfurization activity, less methanation reaction and CO disproportionation reaction and good thermal stability, etc.

Description

technical field [0001] The invention relates to a coke oven gas hydrogenation desulfurization catalyst and a preparation method thereof. Background technique [0002] Coke oven gas is the gas produced during the coking process, which contains recycled chemical products such as hydrogen, methane, carbon monoxide, carbon dioxide, and ethylene. Before using coke oven gas, it must be purified, especially the sulfide in it, because sulfur will poison the catalyst in the subsequent process and make it permanently poisoned and deactivated. In the existing coke oven gas desulfurization process, most of the H 2 S is removed in the wet desulfurization process, while the removal of organic sulfur such as carbonyl sulfide, mercaptan, sulfide, and thiophene requires the method of hydroconversion, that is, under the action of a hydrodesulfurization catalyst, the organic sulfur is converted into Hydrogen sulfide, and then absorb H with desulfurization agent 2 S. [0003] Coke oven gas ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/882B01J23/887C10K1/34
Inventor 王国兴雷家珩张先茂王天元王泽刘志凯赵志杰
Owner WUHAN KELIN FINE CHEM
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