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Catalyst for direct oxidation and desulphurization and its preparation method

A technology of oxidative desulfurization and catalyst, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, preparation/purification of sulfur, etc., can solve low-temperature activity, high investment costs, and tail gas treatment costs High cost and other problems, to achieve high activity and good selectivity

Active Publication Date: 2008-08-27
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] A TiO that can be used in the Modop process is introduced in British Patent 2122597 2 Based catalyst, US4311683 discloses BSR-Selectox process, what use is a kind of non-alkaline porous high temperature resistant oxide as carrier, with vanadium oxide and vanadium sulfide as the catalyst of active components, and the use of these two catalysts The disadvantage is that there are certain restrictions on the high-concentration water content in the process gas, because water seriously interferes with the H 2 The absorption and oxidation process of S involves relatively high investment costs, so that the cost of tail gas treatment in these known methods is also very high; US 4818740 discloses a catalyst that is not affected by high-concentration water content in the process. The catalyst can be used in the Super Claus process, the carrier used is α-Al 2 o 3 , the active component is Fe 2 o 3 -Cr 2 o 3
[0007] Its preparation steps and method of catalyst disclosed in CN 1153136A are roughly the same as CN 1203828A, but the carrier used is SiO with large specific surface 2 carrier, not α-Al 2 o 3 Support, the high temperature activity of the catalyst is not as good as that of α-Al with small specific surface 2 o 3 base catalyst, but its low temperature activity is significantly better than that of α-Al 2 o 3 base catalyst

Method used

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  • Catalyst for direct oxidation and desulphurization and its preparation method
  • Catalyst for direct oxidation and desulphurization and its preparation method
  • Catalyst for direct oxidation and desulphurization and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0022] 70ml 10% AlCl 3 , 80ml 10% FeCl 3 , 20ml 5% ZnCl 2 , 200ml 5%Ti(SO4) 2 Solution, 120ml 1% V 2 o 5 Add the alkali solution dropwise into the co-precipitation reactor at the same time, adjust the pH to 8.0±0.5, and carry out precipitation. Add 15ml of aluminum pentachloride and 5g of urea to the precipitate, stir evenly, dry naturally for 24 hours, extrude and granulate, dry at 120°C for 8 hours, and then bake in a muffle furnace at 600°C for 8h , that is to obtain catalyst sample A, the content of each component in the sample is: Al 2 o 3 25%, Fe 2 o 3 35%, ZnO 5%, TiO 2 30%, V 2 o 5 5%.

Embodiment 2

[0024] 80ml 10% Al (NO 3 ) 3 , 179ml 10% Fe (NO 3 ) 3 , 35ml 5% ZnCl 2 , 115ml 5%Ti(SO4) 2 solution, 70ml 1% V2 o 5 Add the alkali solution dropwise into the co-precipitation reactor at the same time, adjust the pH to 8.5±0.5, and precipitate the metal. Add 15ml of aluminum sol and 5g of urea to the precipitate, stir evenly, dry naturally for 24 hours, extrude and granulate, then bake at 120°C for 8 hours, and then roast in a muffle furnace at 550°C for 8h to obtain Catalyst sample B, the content of each component in the sample is: Al 2 o 3 17%, Fe 2 o 3 52.3%, ZnO 10.7%, TiO 2 17%, V 2 o 5 3%.

Embodiment 3

[0026] 115ml 10% AlCl 3 , 60ml 10% FeCl 3 , 15ml 5% ZnCl 2 , 140ml 5%Ti(SO4) 2 Solution, 228ml 1% V 2 o 5 Add the alkali solution dropwise into the co-precipitation reactor at the same time, adjust the pH to 9.0±0.5, and precipitate the metal. Add 10g of polyvinyl alcohol and 5g of polyethylene glycol to the precipitate, stir evenly, dry naturally for 24 hours, extrude and granulate, then bake at 120°C for 8 hours, and then bake in a muffle furnace at 450°C for 8h , that is to obtain catalyst sample C, the content of each component in the sample is: Al 2 o 3 39.1%, Fe 2 o 3 26.2%, ZnO 4%, TiO 2 20.7%, V 2 o 5 10%.

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Abstract

A catalyst used directly for oxidative desulfurizing to H2S gas contained acidic gas is proportionally prepared from iron oxide, aluminum oxide, titanium oxide, zinc oxide, and vanadium oxide by co-deposition method. It has high activity, selectivity and H2s conversion rate.

Description

technical field [0001] The present invention relates to a kind of suitable for processing containing H 2 A catalyst for direct oxidation and desulfurization of S gas and a preparation method thereof. Specifically, the invention relates to a catalyst for selectively oxidizing hydrogen sulfide into elemental sulfur and a preparation method of the catalyst. Background technique [0002] In the process of synthesis gas production, natural gas production and petroleum refining, due to the presence of sulfur in petroleum, natural gas and coal, it is often accompanied by the generation of a considerable amount of sulfur-containing compounds (mainly composed of H 2 S), and the existence of sulfide in the gas will corrode the pipeline; cause catalyst poisoning so as to deactivate; affect product quality and cause environmental pollution. At present, the purification of synthesis gas, natural gas and refinery gas, etc., mostly adopts wet enrichment of H 2 S, then the enriched H 2 T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/52B01D53/86B01J23/847C10K1/34C01B17/04
Inventor 王昆王立蓉马光伟吴冬刘军刘志花周静
Owner PETROCHINA CO LTD