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Method for in-situ preparation of coal-biomass prepared carbon base NOx adsorption reduction catalyst

An in-situ preparation and biomass technology, which is applied in the field of air pollution control technology and environmental protection catalytic materials, can solve the problems that cannot meet the requirements of NOx adsorption-reduction dual-functional catalytic technology, and achieve the effect of excellent lattice structure and promoting molding

Active Publication Date: 2019-01-22
ENERGY RES INST OF SHANDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the above-mentioned technologies still cannot meet the technical requirements for NOx adsorption-reduction dual-function catalysis.

Method used

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  • Method for in-situ preparation of coal-biomass prepared carbon base NOx adsorption reduction catalyst
  • Method for in-situ preparation of coal-biomass prepared carbon base NOx adsorption reduction catalyst
  • Method for in-situ preparation of coal-biomass prepared carbon base NOx adsorption reduction catalyst

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preparation example Construction

[0034] An in-situ prepared carbon-based NO from coal-biomass x The carbon carrier material of the adsorption reduction catalyst adopts a temperature-segment sedimentation pyrolysis process, that is, a carbon-containing precursor material with certain functions is selected in a targeted manner, and the carbon-containing precursor is formed, pore structure optimized, and activated in low-temperature, medium- and high-temperature stages. into a carbon-based support with excellent adsorption activity. The carrier preparation precursor is a mixture of coal and biomass, and the coal is made of inferior coal with high volatile and ash content to ensure excellent pore structure and high mechanical strength during the preparation process. Biomass uses straw, grass and other powders with high basic metal salt content to ensure that the carbon materials contain more basic active functional groups during the pyrolysis process. While pyrolyzing at different temperatures, active metal salt...

Embodiment 1

[0044] Example 1: 55% lignite-45% rice straw based Cu-Fe catalyst

[0045] Weigh 15.037gFe(NO 3 ) 3 9H 2 O, 4.496g Cu(NO 3 ) 2 ·3H 2 O, dissolved in 150ml deionized water. Weigh 55g of lignite and 45g of rice straw, and grind them into particles below 2 μm in a coal mill. After the solvent is thoroughly mixed with the powder at room temperature, it is added to the settling furnace feeder. The lower part of the settling furnace is fed with an air stream containing 3vol.% oxygen, and after the reaction at low temperature (50-150°C), medium temperature (150-450°C), and high temperature (450-750°C), the catalyst forms spherical particles with a particle diameter of about 3mm . Since this example is a small-scale experiment, there is a rolling barrel structure in the feeding process, which promotes the formation of spherical particles.

Embodiment 2

[0046] Example 2: 55% lignite-15% rice straw-30% sawdust based Cu-Fe catalyst

[0047] Weigh 15.037gFe(NO 3 ) 3 9H 2 O, 4.496g Cu(NO 3 ) 2 ·3H 2 O, dissolved in 150ml deionized water. Weigh 55g of lignite, 15g of rice straw, and 30g of pine sawdust and grind them into particles below 2 μm in a coal mill. The top spraying form of the settling furnace is adopted to mix the solid with the liquid, and the shape of the particles is completed during the settling process. The lower part of the settling furnace is fed with an air stream containing 3vol.% oxygen, and after the reaction at low temperature (50-150°C), medium temperature (150-450°C), and high temperature (450-750°C), the catalyst forms irregular particles with a diameter of about 1mm. particles.

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Abstract

The invention discloses a method for the in-situ preparation of coal-biomass prepared carbon base NOx adsorption reduction catalyst. The catalyst selects specific coal and biomass as a carrier precursor, and selects specific metal as forming accessory ingredient and active ingredient precursor so as to finish technologies including activation, forming and the like in situ in a drop furnace. The prepared catalyst has high NOx adsorption performance, meanwhile, the catalyst can catalyze micromolecule flammable gas (carbon monoxide, methane and the like) to react with NOx, realizing high NOx removal rate. According to the active ingredients of the catalyst, cheap metal is adopted to solve the problems that traditional commercial catalyst has poor replaceability, environment pollution and thelike. Compared with the conventional selective adsorption-catalytic reduction catalyst, the catalyst disclosed by the invention has the following advantages that the coal and biomass mixed material isadopted as the carrier precursor so as to omit alkali metal or alkaline earth commonly used by the NOx adsorption catalyst. The catalyst has the advantages of high nitric oxide adsorption performance, high adsorption performance and high NOx catalytic reduction performance (98% or above).

Description

technical field [0001] The invention belongs to the field of air pollution control technology and environmental protection catalytic materials, in particular to an in-situ preparation of NO x The method of adsorption and reduction of dual-functional catalysts uses a mixture of coal and biomass as a carrier precursor, and changes the activity of the catalyst through in-situ feed ratio changes and element doping. It is used for NO x Adsorption-reduction removal process. Background technique [0002] At present, the main pollutants causing air pollution are nitrogen oxides (NO x ), sulfur dioxide (SO 2 ) and soot, etc. Among these pollutants, the most difficult and costly to deal with is NO x , and NO x Not only will it evolve into acid rain in the atmosphere, but it will also combine with hydrocarbons to form photochemical smog, which will destroy the ozone layer. Since 2013, winter smog in North China, East China, and Northeast China has been severe, and stricter policie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J23/83B01J20/20B01J20/30B01D53/90B01D53/86B01D53/56
CPCB01D53/8628B01D53/90B01D2251/202B01D2251/204B01D2251/208B01D2255/2063B01D2255/2065B01D2255/2073B01D2255/20738B01D2255/20746B01D2255/20753B01D2255/20761B01J20/0207B01J20/0229B01J20/0237B01J20/0296B01J20/20B01J23/745B01J23/83B01J2220/42B01J2220/4806B01J2220/4825
Inventor 王鲁元孙荣峰赵改菊员冬玲耿文广
Owner ENERGY RES INST OF SHANDONG ACAD OF SCI
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