Catalyst and preparation method of coated catalyst

A catalyst and coating technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of expensive materials, low light utilization rate, high energy consumption, etc., and achieve simple and convenient preparation process. Improved decomposition rate and high catalytic activity

Active Publication Date: 2019-05-31
XIANGTAN UNIV
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  • Abstract
  • Description
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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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  • Catalyst and preparation method of coated catalyst
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  • Catalyst and preparation method of coated catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A preparation method of a silica-coated molybdenum-based compound catalyst.

[0043] The molybdenum-based compound core structure can be prepared by various methods, or directly purchase commercially available molybdenum disulfide, molybdenum carbide and molybdenum nitride.

[0044] The preparation method of molybdenum carbide and molybdenum nitride is as follows:

[0045] The first step is to weigh a certain amount of molybdate and put it into the crucible, then put the crucible with molybdate into the muffle furnace. Time, the ideal temperature of the muffle furnace is 450°C-700°C, the heat preservation treatment time is 2-8h, and then cooled to room temperature to obtain molybdenum trioxide.

[0046] The second step is to put the molybdenum trioxide obtained in the first step into the porcelain boat, then put the porcelain boat into the tube furnace, set the heating rate of the tube furnace, and then feed NH 3 Purge, the purge time is 10-25min, warm up the tube fur...

Embodiment 2

[0055] The catalyst prepared according to Example 1 is applied to the decomposition of catalyzed hydrogen sulfide, specifically: first asbestos is filled in the reaction quartz tube of the microwave reactor to facilitate the fixing of the catalyst bed, and then the catalyst in Example 1 is put into the quartz tube A microwave catalyst bed is formed in the tube, a thermocouple is inserted into the center of the catalyst bed for temperature measurement, and then mixed gas of hydrogen sulfide is introduced to cause a gas-solid phase catalytic reaction to achieve the purpose of decomposing hydrogen sulfide.

[0056] The mixed gas is provided by Dalian Date Gas Co., Ltd., and the waste gas is composed of nitrogen and hydrogen sulfide, wherein the content of hydrogen sulfide is 15vol%. The gas chromatograph was GC-7890A manufactured by Agilent Corporation, USA. The range of microwave power is 0-1350w, preferably 300-800W, and the frequency is 2450MHz.

[0057] In this example, diff...

Embodiment 3

[0062] In this embodiment, the microwave catalyst is MoN x @SiO 2 , the quality is 2g, the waste gas containing hydrogen sulfide (using 15vol% H in the present invention 2 S and 85vol% N 2 The mixed gas was tested) the inlet flow rate was 60ml / min, and the reaction pressure was normal pressure. The influence of different microwave input powers (set to 700W, 750W, and 800W) on the decomposition of hydrogen sulfide was investigated. The experimental results are shown in Table 2, Table 2 It is the effect of the same catalyst used in hydrogen sulfide decomposition experiments under different microwave input powers.

[0063] Table 2

[0064]

[0065] It can be seen from Table 2 that with the continuous increase of microwave input power, the temperature of the catalyst bed is also continuously increased, and the corresponding decomposition rate of hydrogen sulfide is also continuously increased. When the input power is 700W, the bed The temperature can reach 584°C, and the de...

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Abstract

The invention provides a preparation method of a coated catalyst. The catalyst comprises a molybdenum-based compound core structure and an outer coated silicon dioxide shell structure, wherein the molybdenum-based compound core structure is one or more of molybdenum disulfide, molybdenum carbide and molybdenum nitride. The method comprises the following steps: step A, acquiring a powdery molybdenum-based compound core structure; step B, uniformly mixing the powdery molybdenum-based compound with a dispersing agent, adding alkali for adjusting the pH value, a surfactant and ethyl orthosilicate,carrying out solid-liquid separation after reaction, washing and drying the obtained solid to obtain a precursor of the coated catalyst, and roasting the precursor at the temperature of 600-1000 DEGC to obtain the coated catalyst, wherein the dispersing agent comprises one or more of deionized water, ethanol and polyvinylpyrrolidone. The preparation process is simple and convenient, raw materials are easy to obtain, the microwave catalytic hydrogen sulfide direct decomposition activity is high, and the stability is good.

Description

technical field [0001] The invention belongs to the technical field of waste gas treatment containing hydrogen sulfide, and in particular relates to a preparation method of a coated catalyst and the catalyst. Background technique [0002] Hydrogen sulfide (H 2 S) is a colorless and highly toxic gas with a pungent smell of rotten eggs at low concentrations. It naturally exists in crude oil, natural gas, volcanic gases, hot springs and some lakes, and is also derived from by-products of industrial manufacturing. Such as petroleum refining, natural gas purification, coal mining, paper mills, leather factories, etc. It will not only cause serious corrosion to the transportation pipeline, but also bring a huge burden to the environment, and also pose a serious threat to human health. Therefore, in terms of hydrogen sulfide treatment, national regulations also impose strict requirements on related industries. [0003] At present, the main method for industrially treating hydrog...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J27/22B01J27/051B01J35/10B01D53/86B01D53/52
CPCY02C20/20
Inventor 徐文涛陈佳楠周继承朱俊
Owner XIANGTAN UNIV
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