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Preparation method of heterogeneous solid catalyst for preparing ammonia by hydrolyzing urea

A solid catalyst, a technology for urea hydrolysis, which is applied in the preparation/separation of ammonia, chemical instruments and methods, catalysts for physical/chemical processes, etc., can solve the problems of high preparation cost and active site exposure, and achieves low preparation cost and simple preparation. , the effect of large specific surface area

Pending Publication Date: 2021-04-09
CHINA HUADIAN ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Heterogeneous catalysts generally use metals or metal oxides as catalysts, but there are disadvantages such as high preparation costs and less exposure of active sites.

Method used

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  • Preparation method of heterogeneous solid catalyst for preparing ammonia by hydrolyzing urea
  • Preparation method of heterogeneous solid catalyst for preparing ammonia by hydrolyzing urea
  • Preparation method of heterogeneous solid catalyst for preparing ammonia by hydrolyzing urea

Examples

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Effect test

Embodiment 1

[0032] Embodiment 1 of the present invention: a preparation method of a heterogeneous solid catalyst for ammonia production by hydrolysis of urea:

[0033] Preparation of S1 alumina precursor: Fully grind aluminum nitrate powder and ammonium bicarbonate powder at room temperature, the molar ratio of aluminum nitrate: ammonium bicarbonate is 1:4; then mix the two powders and continue grinding until it becomes a milky white paste The milky white paste substance was placed in a crystallization kettle for aging at 80°C for 7 hours, then washed with deionized water, filtered with suction, and dried at 120°C for 6 hours to obtain aluminum ammonium carbonate powder, an alumina precursor;

[0034]Preparation of S2 catalyst carrier: Mix the aluminum ammonium carbonate powder obtained in step S1, the lubricant (squat powder) and the pore structure modifier (nano carbon black), and slowly add the binder (by mass ratio of 1: 20 The acid peptizer prepared from nitric acid and water), fully...

Embodiment 2

[0040] Embodiment 2: A kind of preparation method of the heterogeneous solid catalyst that is used for urea hydrolysis to produce ammonia:

[0041] Preparation of S1 alumina precursor: Fully grind aluminum nitrate powder and ammonium bicarbonate powder at room temperature, add structural aid (PEG-400) to the ammonium bicarbonate powder and mix evenly, aluminum nitrate: ammonium bicarbonate: PEG- The molar ratio of 400 is 1:4:0.036; then mix the two powders, and continue to grind until it becomes a milky white paste; place the milky white paste in a crystallization kettle for aging at 80°C for 7 hours, and then wash it with deionized water , suction filtration, and drying at 120°C for 6 hours to obtain aluminum oxide precursor ammonium aluminum carbonate powder;

[0042] Preparation of S2 catalyst carrier: Mix the aluminum ammonium carbonate powder obtained in step S1, the lubricant (Tanjing powder) and the pore structure modifier (nano carbon black), and slowly add the binder ...

Embodiment 3

[0048] Embodiment 3: A kind of preparation method of the heterogeneous solid catalyst that is used for urea hydrolysis to produce ammonia:

[0049] Preparation of S1 alumina precursor: Fully grind aluminum nitrate powder and ammonium bicarbonate powder at room temperature, add structural aid (PEG-200) to the ammonium bicarbonate powder and mix evenly, aluminum nitrate: ammonium bicarbonate: PEG- The molar ratio of 200 is 1:4:0.036; then mix the two powders, and continue to grind until it becomes a milky white paste; put the milky white paste in a crystallization kettle for aging at 80°C for 7 hours, and then wash it with deionized water , suction filtration, and drying at 100°C for 2 hours to obtain aluminum oxide precursor ammonium aluminum carbonate powder;

[0050] Preparation of S2 catalyst carrier: Mix the ammonium aluminum carbonate powder, lubricant (talcum powder) and pore structure modifier (carbon nanofiber) obtained in step S1, and slowly add the binder (by mass rat...

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Abstract

The invention provides a preparation method of a heterogeneous solid catalyst for preparing ammonia by hydrolyzing urea. The preparation method comprises the following steps: S1, preparing an aluminum oxide precursor; S2, preparing a catalyst carrier; and S3, preparing the catalyst. According to the invention, Al2O3 is used as a carrier, alkaline metal oxide is used as an active component, the heterogeneous solid catalyst is prepared by an impregnation method, after the alkaline oxide active component is loaded on alumina, the catalyst can expose more catalytic active sites, and the catalytic hydrolysis reaction of urea is promoted. The heterogeneous solid catalyst prepared in the invention has the advantages of stable physical and chemical properties, good hydrothermal stability, difficult loss of active components after long-term use, re-usability and low preparation cost; meanwhile, the catalyst can reduce the operation temperature and pressure, reduce the steam consumption and reduce the operation cost of the system.

Description

technical field [0001] The invention relates to the technical field of flue gas denitrification, in particular to a preparation method of a heterogeneous solid catalyst used for hydrolyzing urea to produce ammonia, and belongs to the technical field of air pollution control. Background technique [0002] Selective catalytic reduction (SCR) denitrification technology has been widely used at home and abroad because of its high efficiency. The reducing agents commonly used in SCR denitrification technology include liquid ammonia, ammonia water and urea. Liquid ammonia and ammonia water are dangerous chemicals, which have great safety hazards in transportation and unloading. If leakage occurs, it will have an impact on the safe production of the power plant, surrounding residents and the ecological environment. And urea is a kind of non-toxic and harmless chemical product, it has good performance index and operation control safety, its chemical properties are stable, it will no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/28C01C1/08
CPCB01J23/28C01C1/086Y02P20/52
Inventor 胡小夫张锡乾孙路长汪洋王争荣王凯亮肖隽杨彭飞
Owner CHINA HUADIAN ENG
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