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Sulfur-resistant deoxidation catalyst and preparation method thereof

A technology of sulfur-resistant deoxidation catalyst and alumina carrier, applied in catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalyst, etc., can solve catalyst poisoning, catalyst deactivation, sulfide Difficult to remove clean and other problems, to achieve good active effect

Pending Publication Date: 2020-11-10
成都龙飞科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, palladium-based noble metal deoxidation catalysts are mainly used in the market. Such catalysts are very sensitive to sulfides in water gas and semi-water gas, and sulfides above 1 ppm can cause catalyst poisoning and rapid deactivation. Therefore, currently The water gas and semi-water gas deoxidation catalysts on

Method used

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  • Sulfur-resistant deoxidation catalyst and preparation method thereof
  • Sulfur-resistant deoxidation catalyst and preparation method thereof

Examples

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Embodiment 1

[0022] An embodiment of the present invention provides a method for preparing a sulfur-tolerant deoxidation catalyst, comprising:

[0023] Step S1, selecting at least one element of metal palladium, platinum, silver, ruthenium and rhodium as the active element, selecting at least one salt of sulfate, oxalate and nitrate of the active element, and preparing a mixed solution A, The metal concentration of the mixed solution A is 0.5-5%, and the pH value of the mixed solution A is adjusted to be weakly acidic. Add gamma-alumina carrier into the mixed solution A, let stand for 1-4 hours, drain, dry at 90-110°C, and then roast at 350-600°C for 2-6 hours.

[0024] Step S2, using group B elements as auxiliary elements, selecting at least one of oxides, sulfides and nitrates of the auxiliary elements to prepare a solution B, the metal concentration of the solution B is 0.1-1%, and the pH value is adjusted to be Weakly acidic.

[0025] Step S3, pour the semi-finished product roasted i...

Embodiment 2

[0040] A sulfur-tolerant deoxidation catalyst, prepared by the preparation method of Example 1.

[0041] Deoxidation principle:

[0042] The catalyst adopts an impregnation method to prepare a sulfur-resistant deoxidation catalyst with small metal particle size and high dispersion of active components. The catalyst has good hydrogen-oxygen reaction selectivity in an atmosphere containing sulfur in the raw material gas, and at the same time suppresses side reactions of carbon monoxide. In the environment of high sulfur and high temperature (≥300℃), it still has good deoxidation performance.

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Abstract

The invention relates to a sulfur-resistant deoxidation catalyst and a preparation method thereof. The preparation method comprises the following steps: S1, selecting sulfate and oxalate of at least one element of metal palladium, platinum, silver, ruthenium and rhodium and at least one salt of nitrate to prepare a solution A, adding a gamma-aluminum oxide carrier into the mixed solution A, performing standing treatment, draining the solution, and drying and roasting the gamma-aluminum oxide carrier; S2, preparing a solution B from at least one of oxides, sulfides and nitrates of B-group elements; S3, pouring the semiproduct roasted in the step S1 into the solution B, performing standing treatment, draining the solution, and drying and roasting the gamma-aluminum oxide carrier; s4, preparing a a solution C with the pH value being 10-11 with formaldehyde or hydrazine hydrate solution as an active agent; and S5, pouring the semiproduct obtained in the step S3 into the solution C, performing standing treatment, draining the solution, and treating the semiproduct at 90-110 DEG C for 8-12 hours to obtain the finished product. Even if the feed gas contains hundreds of ppm of sulfide, thecatalyst still has good activity, selectivity and stability.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a sulfur-resistant deoxidation catalyst and a preparation method thereof. Background technique [0002] Methanol synthesis and synthetic ammonia industrial raw material gas purification, remove oxygen in the raw material gas, and eliminate a series of adverse effects of oxygen on the process of synthesizing methanol and ammonia. [0003] At present, palladium-based noble metal deoxidation catalysts are mainly used in the market. Such catalysts are very sensitive to sulfides in water gas and semi-water gas, and sulfides above 1 ppm can cause catalyst poisoning and rapid deactivation. Therefore, currently The water gas and semi-water gas deoxidation catalysts on the market require fine desulfurization before deoxidation can be carried out. However, the sulfides in water gas and semi-water gas are difficult to remove. During use, even trace amounts of sulfur cannot be adsorbed. And enterin...

Claims

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Application Information

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IPC IPC(8): B01J37/02B01J23/89B01J23/38
CPCB01J37/0213B01J37/024B01J23/38B01J23/89
Inventor 陈斌覃春平蒋汪洋周英徐沾倪龙军
Owner 成都龙飞科技有限公司