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Atom-doped modified double-shell integral hollow catalyst as well as preparation method and application thereof

A monolithic catalyst technology, which is applied in the fields of comprehensive resource utilization and environmental pollution control, can solve the problems of molecular sieve catalyst poisoning, and achieve the effects of high and low temperature catalytic activity, sufficient surface active oxygen components, and high catalytic redox characteristics

Active Publication Date: 2021-12-31
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the carbon and chlorine poisoning problems on the surface area of ​​zeolite catalysts have not been effectively solved

Method used

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  • Atom-doped modified double-shell integral hollow catalyst as well as preparation method and application thereof
  • Atom-doped modified double-shell integral hollow catalyst as well as preparation method and application thereof
  • Atom-doped modified double-shell integral hollow catalyst as well as preparation method and application thereof

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Experimental program
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Effect test

preparation example Construction

[0074] A method for preparing an atom-doped modified double-shell monolithic hollow catalyst, characterized in that it comprises the following steps:

[0075] S1: Preparation of organic carbon microspheres

[0076] S101: Mix the soluble starch and glucose according to the ratio, heat and stir, transfer to the reaction kettle, and perform dynamic hydrothermal reaction to obtain the mixture A;

[0077] S102: After the mixture A is cooled, an organic solid product is obtained after ultrasonication, filtration, and drying, which are organic carbon microspheres;

[0078] S2: Preparation of organic carbon microspheres coated with N-ZSM-5 precursor material

[0079] S201: Add deionized water, sodium hydroxide, tetrapropylammonium hydroxide or tetrapropylammonium bromide, ethanol and polyquaternium into the reaction kettle in sequence according to the proportion and order, and heat and mix with ultrasonic to obtain the mixture B ;

[0080] S202: adding silica sol, organic salt and ...

Embodiment 1

[0090] Layered coating overall crystallization technology

[0091] The method is to convert soluble starch and glucose into carbon microspheres after hydrothermal; Carbon microspheres coated with N-ZSM-5 precursor material were prepared under hydrothermal; finally, the composite carbon microspheres were added to the mixed solution solution with metal-doped M-ZSM-5 precursor, and heated under ultrasonic Under the conditions of mixing, microwave and thermal radiation, after filtering, washing, drying and roasting, the N-ZSM-5@M-ZSM-5 monolithic hollow catalyst was finally prepared, and N and M represent Fe, Cu, Mn, Ni , Co, Ti and other transition metal elements.

[0092] When implementing it:

[0093] Mix soluble starch and glucose in a mass ratio (3-5): 1, heat and ultrasonically stir for a certain period of time, wherein the ultrasonic power is 100-300W, the ultrasonic time is 30-60min, and the heating temperature is 40-70°C. After being transferred into the reactor, the dyn...

Embodiment 2

[0100] Ultrasonic Heating Assisted Microwave Combined Thermal Radiation Gel Crystallization

[0101] The method is to add a certain amount of deionized water, sodium hydroxide, tetrapropylammonium hydroxide or tetrapropylammonium bromide ( TPAOH / TPABr), ethanol, polyquaternium salt, silica sol and transition metal salt components, ultrasonically heated and mixed for a certain period of time, heated and stirred to gel; the gel was transferred to the reaction kettle, combined with microwave After crystallization by heat radiation method for a certain period of time, the catalyst is obtained by washing, drying and calcining.

[0102] When implementing it:

[0103] First, the obtained carbon microspheres coated with N-ZSM-5 precursor material were added to deionized water, sodium hydroxide, tetrapropylammonium hydroxide or tetrapropylammonium bromide (TPAOH / TPABr), ethanol , polyquaternium salt, silica sol and transition metal salt components in the mixed solution, wherein the m...

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Abstract

The invention discloses an atom-doped modified double-shell integral hollow catalyst as well as a preparation method and application thereof. The catalyst is represented by the following general formula: N-ZSM-5 (at) M-ZSM-5, both M-ZSM-5 and N-ZSM-5 are metal atom-doped hierarchical pore molecular sieves with MFI structures, and N and M represent transition metal elements in Fe, Cu, Mn, Ni, Co, Ti and the like. The catalyst is a double-shell integral hollow catalyst, and an outer layer M-ZSM-5 and an inner layer N-ZSM-5 are tightly combined into a whole. The catalyst has relatively high specific surface area, mesoporous channels and diffusivity; and in the aspect of surface chemical properties, the catalyst has higher catalytic oxidation-reduction characteristic, sufficient surface active oxygen components and appropriate acidity. Meanwhile, the catalyst shows relatively high low-temperature catalytic activity, sulfur resistance, water resistance and chlorine poisoning resistance during catalytic oxidation of VOCs, and the stability of the catalyst is improved. The successful preparation of the catalyst can bring certain economic benefits and environmental benefits for low-temperature purification of complex organic waste gas, especially removal of CVOCs and impurity VOCs containing sulfur dioxide and the like.

Description

technical field [0001] The invention relates to the technical fields of resource comprehensive utilization and environmental pollution control, in particular to an atom-doped modified double-shell monolithic hollow catalyst, its preparation method and application. Background technique [0002] As one of the important air pollutants, volatile organic compounds (VOCs) have complex components and various types, which directly affect human health and the ecological environment. To reduce PM 2.5 and O 3 Pollution, eliminating the emission of VOCs is crucial. Among many VOCs treatment technologies, catalytic combustion technology is widely used in the purification of VOCs because of its low energy consumption, high efficiency and no secondary pollution. However, catalysts are at the heart of catalytic combustion technology. The physical and chemical properties of the catalyst directly affect the oxidation effect of organic waste gas. [0003] In addition, according to the dif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40B01J29/46B01J29/48B01J35/10B01D53/86B01D53/72B01D53/70B01D53/44
CPCB01J29/46B01J29/48B01J29/405B01D53/8662B01D53/8668B01D53/8687B01J2229/18B01J35/615B01J35/647Y02A50/20
Inventor 李建赵佳佳胡京南石应杰王洪昌束韫邓双刘燕丽
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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