Composite type catalyst and preparation method thereof

A catalyst and composite technology, applied in chemical instruments and methods, physical/chemical process catalysts, preparation/purification of sulfur, etc., can solve the problems of easy deactivation, expensive materials, high temperature required, etc. Effects of absorption and decomposition, controllable process parameters, and improved stability

Active Publication Date: 2019-05-17
XIANGTAN UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] At present, the main method for industrially treating hydrogen sulfide waste gas is the Claus process, which is to incompletely oxidize hydrogen sulfide to generate water and sulfur, so that sulfur can be recovered, but hydrogen resources are wasted, because hydrogen sulfide waste gas cannot be recovered It is completely oxidized, and the tail gas is also accompanied by the generation of sulfur dioxide. Direct discharge into the atmosphere will cause secondary pollution. Therefore, it is very meaningful to find an effective way to directly decompose hydrogen sulfide into sulfur and hydrogen.
[0004] In recent years, there are many shortcomings in the method of directly decomposing hydrogen sulfide to generate hydrogen and sulfur: excessive energy consumption, expensive materials, low catalyst decomposition efficiency and easy deactivation, harsh decomposition reaction conditions, etc., for exam

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  • Composite type catalyst and preparation method thereof
  • Composite type catalyst and preparation method thereof
  • Composite type catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The specific steps of alkali treatment of silicon carbide: put silicon carbide into an alkali solution of a certain concentration, the treatment temperature is 50-90°C, and the treatment time is 1-6 hours; the alkali solution is sodium hydroxide or potassium hydroxide solution At least one of them, the molar concentration of the alkali solution is 0.2-4 mol / L.

[0022] A kind of preparation method of composite catalyst:

[0023] Step 1: Weigh 0.276g of ammonium molybdate and 0.800g of cobalt nitrate hexahydrate into a beaker, add 40ml of pure water, and stir to dissolve.

[0024] In the second step, 2 g of alkali-treated silicon carbide is weighed and added to the solution in the first step, and stirred on a magnetic stirrer to form a mixed solution.

[0025] The third step is to put the mixed liquid into a constant temperature water bath, firstly age it at 40°C for 30 minutes, then evaporate it at 70°C for 4 hours, and then put it into an oven and dry it at a constant...

Embodiment 2

[0033] The composite microwave catalyst prepared according to Example 1 is applied to the decomposition of catalytic hydrogen sulfide, specifically: first, asbestos is filled in the reaction quartz tube of the microwave reactor to facilitate fixing the catalyst bed, and then the prepared in Example 1 The composite catalyst is placed in a quartz tube to form a microwave catalyst bed, a thermocouple is inserted into the center of the catalyst bed, and then a mixed gas of hydrogen sulfide is introduced to cause a gas-solid phase catalytic reaction to achieve the purpose of decomposing hydrogen sulfide.

[0034] The mixed gas is provided by Dalian Date Gas Co., Ltd., and consists of nitrogen and hydrogen sulfide, wherein the hydrogen sulfide content is 15vol%.

[0035] The gas chromatograph was GC-7890A manufactured by Agilent Corporation, USA.

[0036]The range of microwave power is 0-1350W, preferably 300-800W, and the frequency is 2450MHz.

[0037] Details are as follows:

[...

Embodiment 3

[0043] In this example, different kinds of composite catalysts were selected to carry out the hydrogen sulfide decomposition reaction experiment. The dosage of the composite catalyst was 2 g, the mesh size was 40-60 mesh, and the bed temperature of the catalyst was 650°C. The carbonization times were all 1 hour. Hydrogen sulfide mixed gas (use 15vol% H in the present invention 2 S and 85vol% N 2 The mixed gas was tested) the inlet flow rate was 60ml / min, the reaction pressure was normal pressure, and the temperature of the reaction bed was regulated by adjusting the microwave power. The experimental results are shown in Table 2. Table 2 shows the decomposition rate of different catalysts for microwave catalytic decomposition of hydrogen sulfide.

[0044] Table 2

[0045] catalyst

[0046] C-Mo 2 C / SiC, C-Co 2 The decomposition rates of C / SiC and C-WC / SiC catalysts were 50.1%, 49.5%, and 47.3% when the bed temperature was 650°C. This shows that different types o...

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Abstract

The invention discloses a composite type catalyst and a preparation method thereof. The catalyst comprises at least one kind of transition metal carbide compounded with carbon as active ingredients and silicon carbide as carriers; when M is used for representing transition metal, MC is transition metal carbides; the composite type catalyst is shown as C-MC/SiC. The preparation method comprises thefollowing steps of firstly dissolving a transition metal salt to form a transition metal salt solution; then, mixing the transition metal salt solution with silicon carbide; next, performing drying by distillation, drying and roasting on the mixed solution to obtain precursors; finally, performing microwave treatment, carbonization and cooling on the precursors in a reactor to obtain the composite type catalyst. According to the invention, the catalysis performance of the active ingredients can be realized to the maximum degree; the catalyst stability can be largely improved; the hydrogen sulfide decomposition is facilitated; after the hydrogen sulfide is subjected to alkali treatment, the hydrogen sulfide absorption and decomposition are facilitated. The catalyst provided by the invention has the advantages that the raw material cost is low; the obtaining of the raw materials is easy; the steps of the preparation method are simple and convenient; the process parameters are controllable, and the operation is convenient.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a composite catalyst and a preparation method thereof. Background technique [0002] With the rapid development of society and economy in today's society, the country and the people pay more and more attention to environmental protection. Hydrogen sulfide is a by-product in the mining and processing of coal, oil and natural gas. If it is directly discharged into the environment without treatment, it will cause serious environmental pollution. Especially in recent years, gas fields with relatively high sulfur content have emerged continuously. In the petrochemical industry, hydrodesulfurization technology is widely used to produce high-quality fuel oil. Therefore, a large amount of hydrogen sulfide waste gas is produced every day. Corrosion of equipment and piping during transport. Hydrogen sulfide is a highly toxic gas with high chemical activity. When the concentr...

Claims

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Application Information

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IPC IPC(8): B01J27/224C01B17/04
Inventor 徐文涛陈佳楠周继承朱俊
Owner XIANGTAN UNIV
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