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Hierarchical porous composite metal oxide as well as preparation method and application thereof

A technology of composite metals and metal compounds, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problems of low catalytic efficiency of specific pore size metal catalysts

Active Publication Date: 2021-06-11
HEBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Catalytic oxidation is one of the most effective technical means for purifying coal-fired flue gas pollutants. The commonly used catalysts are porous metal catalysts, such as Deljoo et al. 3 ) 2 As a precursor, F127 is a soft template to synthesize a Mn-based catalyst with a pore diameter of 6.5nm; Dissanayake et al. [Appl. .Sci.2016,285,1] Using PMMA colloidal crystals as a hard template to prepare porous Ce-based catalysts with a pore size distribution of 20nm, however, the specific pore size metal catalysts prepared by the prior art have low catalytic efficiency

Method used

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  • Hierarchical porous composite metal oxide as well as preparation method and application thereof
  • Hierarchical porous composite metal oxide as well as preparation method and application thereof
  • Hierarchical porous composite metal oxide as well as preparation method and application thereof

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preparation example Construction

[0031] The present invention provides a method for preparing the multi-stage porous composite metal oxide described in the above technical solution, comprising the following steps:

[0032] The metal compound is mixed with the template agent, and the obtained mixture is ball-milled to obtain the first precursor. The metal compound includes any two of manganese metal compound, cerium metal compound, copper metal compound and iron metal compound. The template Agents include hard templating agents and soft templating agents;

[0033] The first precursor is calcined and the template agent is removed to obtain the multi-level porous composite metal oxide.

[0034] In the present invention, the metal compound and template agent are mixed, and the obtained mixture is ball-milled to obtain the first precursor, and the metal compound includes any two of manganese metal compound, cerium metal compound, copper metal compound and iron metal compound, The templating agent includes a hard ...

Embodiment 1

[0054] Weigh 2g of Ce(NO 3 ) 3 ·6H 2 O, 2g of Mn(NO 3 ) 2 , 2g SiO 2 , 0.8g of F127, add 2 quartz balls with a diameter of 0.7cm and 2 quartz balls with a diameter of 1.1cm, put them in a ball mill reactor, mill them at 30Hz for 60min, calcinate at 500°C for 3h, and cool to room temperature , mix the calcined product with 2.5mol / L NaOH solution, stir for 8h to remove SiO 2 Template, suction filtered, washed with deionized water until the solid product is neutral to the washed solution, and the solid product is placed in a drying oven for 24 hours to obtain a multi-level porous MnCeO x , the hierarchical channel MnCeO x The micropore volume is 0.058cm 3 / g; mesopore volume is 0.117cm 3 / g; the volume of the large pores is 0.011cm 3 / g; specific surface area 272.77m 2 / g, total pore volume 0.28cm 3 / g, the average pore diameter is 4.05nm.

Embodiment 2

[0056] Weigh 2g of Cu(NO 3 ) 2 ·6H 2 O, 2g of Mn(NO 3 ) 2 , 2g of PMMA, 0.8g of F127, add 2 quartz balls with a diameter of 0.7cm and 2 quartz balls with a diameter of 1.1cm, place them in a ball milling reactor, and after ball milling at 30Hz for 60min, calcinate at 500°C for 3h. After cooling to room temperature, the calcined product was mixed with 2.5mol / L NaOH solution and stirred for 8h to remove SiO 2 Template, suction filtered, washed with deionized water until the solid product is neutral to the washed solution, and the solid product is placed in a drying oven for 24 hours to obtain a multi-level porous CuMnO x , the hierarchical channels of CuMnO x The micropore volume is 0.043cm 3 / g; mesopore volume is 0.196cm 3 / g; the volume of the large pores is 0.31cm 3 / g; specific surface area 209.1m 2 / g, total pore volume 0.51cm 3 / g, the average pore diameter is 9.79nm.

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Abstract

The invention belongs to the technical field of porous catalyst preparation, and particularly relates to a hierarchical porous composite metal oxide as well as a preparation method and application thereof. The micropore volume of the hierarchical porous composite metal oxide disclosed by the invention is 0.036 to 0.058 cm < 3 > / g; the pore volume of mesopores is 0.106 to 0.196 cm < 3 > / g; the pore volume of a macropore is 0.010 to 0.310 cm < 3 > / g; and the hierarchical porous composite metal oxide has a structure as shown in M1M2Ox, wherein M1 and M2 comprise any two of Mn, Cu, Fe and Ce. The hierarchical porous composite metal oxide provided by the invention has a hierarchical porous structure, so that the contactable specific surface area of the hierarchical porous composite metal oxide is increased, and the catalytic activity of the hierarchical porous composite metal oxide is enhanced by increasing the number of active sites and the adsorption efficiency of reactants.

Description

technical field [0001] The invention belongs to the technical field of preparation of porous catalysts, and in particular relates to a multi-level pore composite metal oxide and its preparation method and application. Background technique [0002] Due to the widespread use of coal in modern industry, pollutants such as nitrogen oxides, mercury, and volatile organic compounds caused by coal combustion are released into the atmosphere along with the combustion. [0003] Catalytic oxidation is one of the most effective technical means for purifying coal-fired flue gas pollutants. The commonly used catalysts are porous metal catalysts, such as Deljoo et al. 3 ) 2 As a precursor, F127 is a soft template to synthesize a Mn-based catalyst with a pore diameter of 6.5nm; Dissanayake et al. [Appl. .Sci.2016,285,1] Using PMMA colloidal crystals as a hard template to prepare porous Ce-based catalysts with a pore size distribution of 20nm, however, the specific pore size metal catalyst...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J23/889B01J23/83B01J35/10B01J37/00B01J37/08B01D53/86B01D53/64B01D53/56B01D53/72
CPCB01J23/34B01J23/8892B01J23/83B01J23/002B01J37/0036B01J37/088B01D53/8628B01D53/8665B01D53/8668B01D2257/404B01D2257/602B01D2257/708B01D2258/0283B01J35/615B01J35/635B01J35/633B01J35/647
Inventor 张笑沈伯雄任凯
Owner HEBEI UNIV OF TECH
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