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Preparation method of nickel foam base integral denitration catalyst with three-dimensional hierarchical structure

A technology of denitrification catalyst and hierarchical structure, which is applied in the field of preparation of nickel foam-based monolithic catalyst

Inactive Publication Date: 2014-02-19
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned loading methods and catalysts mainly have disadvantages such as low mechanical strength, poor thermal conductivity, cumbersome preparation process, secondary pollution caused by binders, uneven distribution of active components, and easy high-temperature sintering.

Method used

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  • Preparation method of nickel foam base integral denitration catalyst with three-dimensional hierarchical structure
  • Preparation method of nickel foam base integral denitration catalyst with three-dimensional hierarchical structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Cut a 1×5 cm nickel foam into a roll, wash with ethanol and 1 mmol / L dilute hydrochloric acid for 15 min, and then rinse with deionized water. o After drying at C for 3 h, set aside;

[0027] Put the treated nickel foam into the mixed solution of 0.05 mol / L manganese nitrate, 0.25 mol / L ammonium chloride and deionized water and fully immerse it for 1 h, then transfer it to the autoclave with a filling rate of 60% by volume , under the protection of stainless steel case, at 120 o C under the condition of reaction for 6 h, after natural cooling, the product was washed with deionized water, 60 o After drying at C for 3 h, in a tube furnace with 2 o C / min rate of heating up to 400 o C, heat preservation for 3 hours, and after cooling with the furnace, the monolithic denitration catalyst with a three-dimensional hierarchical structure can be obtained. The shape of the catalyst is as figure 1 As shown, the main component of catalyst surface active components is Ni-Mn so...

Embodiment 2

[0030] Cut a 1×5 cm nickel foam into a roll, wash with ethanol and 1 mmol / L dilute hydrochloric acid for 15 min, and then rinse with deionized water. o After drying at C for 3 h, set aside;

[0031] Put the treated nickel foam into the mixture of 0.10 mol / L manganese sulfate, 0.30 mol / L ammonium chloride and deionized water and fully immerse it for 1 h, then transfer it to the autoclave with a filling rate of 65% by volume , under the protection of stainless steel case, at 150 o C under the condition of reaction for 9 h, the product was washed with deionized water after natural cooling, 60 o After drying at C for 3 h, in a tube furnace with 2 o C / min rate of heating up to 500 oC, heat preservation for 4 hours, and after cooling with the furnace, the monolithic denitration catalyst with a three-dimensional hierarchical structure can be obtained.

[0032] Test the catalytic activity of the above catalyst: put the prepared catalyst into a fixed-bed quartz tube reactor for act...

Embodiment 3

[0034] Cut a 1×5 cm nickel foam into a roll, wash with ethanol and 1 mmol / L dilute hydrochloric acid for 15 min, and then rinse with deionized water. o After drying at C for 3 h, set aside;

[0035] Put the treated nickel foam into a mixture of 0.10 mol / L manganese chloride, 0.40 mol / L ammonium chloride and deionized water and fully immerse it for 1 h, then transfer it to a 100 ml high-pressure tank with a filling rate of 70% by volume. In the reaction kettle, under the protection of the stainless steel shell, at 170 o C under the condition of reaction for 12 h, after natural cooling, the product was washed with deionized water, 60 o After drying at C for 3 h, in a tube furnace with 2 o C / min rate heating up to 550 o C, heat preservation for 5 hours, and after cooling with the furnace, the monolithic denitration catalyst with a three-dimensional hierarchical structure can be obtained.

[0036] Test the catalytic activity of the above catalyst: put the prepared catalyst int...

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Abstract

The invention relates to a preparation method of an integral denitration catalyst with a three-dimensional hierarchical structure. The catalyst takes nickel foam as a carrier, and surface active components of the catalyst are mainly manganese oxide and nickel oxide solid solutions. The method is characterized by comprising the steps that the nickel foam serves as a substrate, and reacts with manganese ions and ammonium chloride under a hydrothermal condition; a nickel-manganese binary composite layered double hydroxide nano sheet is directly grown on the surface of the nickel foam; temperature control calcination is performed; and then the high-activity denitration catalyst is obtained. The catalyst requires no forming, and has good mass transfer and heat transfer capacity; the surface active components are the manganese oxide and nickel oxide solid solutions; a binding force between the surface active components and the carrier is higher; and aggregation or falling cannot be generated under a high temperature condition. The catalyst has a wider catalysis temperature window. Therefore, the catalyst can be used for selective catalytic reduction of nitric oxide in diesel engine tail gas and flue gas discharged by a coal-fired power plant, a steel mill and the like.

Description

technical field [0001] The invention belongs to the field of catalyst preparation, and relates to a method for preparing a nickel foam-based monolithic catalyst with a three-dimensional hierarchical structure. Background technique [0002] Nitrogen oxides (NO x ) can lead to serious environmental problems such as acid rain, the hole in the ozone layer, global warming, and photochemical smog. Today, as air pollution control is becoming increasingly strict, the existing denitrification technology is difficult to meet the new emission requirements, so it is particularly important to carry out research on flue gas denitrification in our country. In recent years, ammonia selective reduction (NH 3 -SCR) is widely used in the removal of nitrogen oxides produced by various mobile sources and stationary sources, where V 2 o 5 -WO 3 / TiO 2 The catalyst is currently the most widely used NO x Remove catalyst. However, this type of catalyst has a high active window temperature an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J35/02B01J35/00
Inventor 张登松施利毅蔡思翔黄垒李红蕊张剑平
Owner SHANGHAI UNIV
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