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Method of decomposing hydrogen sulfide for preparation of hydrogen and elemental sulfur

A technology for hydrogen sulfide and elemental sulfur, applied in the preparation/purification of sulfur, hydrogen production, etc., can solve the problems of harsh separation operation, impossible to achieve complete conversion, difficult to complete separation, etc., to achieve universal effects

Active Publication Date: 2013-01-30
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the existing hydrogen sulfide pyrolysis hydrogen production method, due to the limitation of thermodynamic equilibrium, it is impossible to achieve complete conversion, which must involve the separation of product hydrogen and reactant hydrogen sulfide, and the separation operation of hydrogen sulfide-containing gas is very harsh, and Difficult to achieve complete separation

Method used

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  • Method of decomposing hydrogen sulfide for preparation of hydrogen and elemental sulfur
  • Method of decomposing hydrogen sulfide for preparation of hydrogen and elemental sulfur
  • Method of decomposing hydrogen sulfide for preparation of hydrogen and elemental sulfur

Examples

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Effect test

Embodiment 1

[0016] Catalyst preparation: commercially available titanium dioxide, silicon dioxide and aluminum oxide solid powders are molded under pressure, and then sieved to obtain 20-40 mesh particles.

Embodiment 2

[0018] Weigh 1.50 grams of γ-Al with a particle size of 20 to 40 mesh 2 o 3 Carrier (specific surface area 270m 2 / g), take 0.40 g of Cd(NO 3 ) 2 4H 2 O was dissolved in 1.5 ml of deionized water, and the solution was slowly dropped into the carrier and stirred evenly, impregnated at room temperature for 8 hours, and then dried in an oven at 120°C for 12 hours, and the obtained solid was dried in a muffle furnace at 450°C in an air atmosphere After 5 hours of calcination, it was lowered to room temperature, and the obtained catalyst was marked as CdO / Al 2 o 3 . The same method can be used to prepare ZnO / Al 2 o 3 .

Embodiment 3

[0020] With the CdO / Al obtained in embodiment 3 2 o 3 Put it into the quartz tube for vulcanization and pass through the vulcanizing agent (10%H 2 S / Ar), rising to 400°C in 20 minutes and holding for 100 minutes. Obtain the catalyst containing 10% (mass fraction) cadmium sulfide supported by alumina, denoted as CdS / Al 2 o 3 . ZnS / Al 2 o 3 Prepared by the same method.

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Abstract

The invention discloses a method of decomposing hydrogen sulfide for preparation of hydrogen and elemental sulfur, which belongs to the technical field of hydrogen production and gas purification. The invention is characterized in that: hydrogen sulfide or gas containing hydrogen sulfide is subjected to ionization through blockage of discharge by using a medium so as to form uniformly distributednon-equilibrium plasma, and hydrogen sulfide spontaneously decomposes into hydrogen and elemental sulfur in the plasma; when there is a photocatalyst in the plasma, energy in the photons of the photocatalyst can be utilized to promote decomposition of hydrogen sulfide, and complete conversion can be realized under proper conditions. All the frequently used solid photocatalysts can be used in the above mentioned process, e.g., titanium oxide, cerium oxide, zirconia, zinc oxide, cadmium oxide, copper oxide, molybdena, tungsten oxide, zinc sulfide, cadmium sulfide, copper sulfide, molybdenum sulfide, tungsten sulfide and a mixture composed of two or more selected from the above-mentioned photocatalysts; the photocatalysts can also be loaded on a porous material to prepare load type catalysts. The method provided in the invention is especially applicable to treatment of gas containing hydrogen sulfide in the industries of natural gas, petroleum and coal chemistry and is also applicable topreparation of hydrogen and elemental sulfur through dissociation of gas containing hydrogen sulfide in the fields of metallurgy, sea and the like. The method has no special requirements for or restriction on the source and composition of gas; thus, the method has universality to preparation of hydrogen through decomposition of hydrogen sulfide.

Description

technical field [0001] The invention belongs to the technical field of hydrogen production and gas purification, and relates to a method for decomposing harmful hydrogen sulfide into nontoxic elemental sulfur and simultaneously obtaining hydrogen. technical background [0002] Hydrogen sulfide is a highly toxic, foul-smelling, colorless gas that not only endangers human health, but also causes corrosion of metals and other materials, so it needs to be treated in situ. Natural gas, petroleum, coal and mineral processing industries produce a large amount of hydrogen sulfide-containing gas, which is currently partially oxidized into elemental sulfur and water mainly through the Claus method: [0003] h 2 S+3 / 2O 2 → SO 2 +H 2 o [0004] 2H 2 S+SO 2 →3 / xS x +2H 2 o [0005] Although the Claus process can achieve harmless hydrogen sulfide, it converts hydrogen resources with higher added value into water, wasting precious resources. Obviously, if hydrogen sulfide can be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/04C01B17/04
CPCY02E60/364Y02E60/36
Inventor 王安杰赵璐金亮王瑶李翔
Owner DALIAN UNIV OF TECH
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