CeO2-TiO2 nanorod/graphene denitration catalyst as well as preparation and application thereof

A technology of denitrification catalyst and graphene, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc., can solve the problems of poor denitrification performance at low temperature, and improve low temperature The effect of denitrification performance, simple preparation process and process safety

Pending Publication Date: 2021-08-17
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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Problems solved by technology

[0006] In view of the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of CeO 2 -TiO 2 Nanorod / graphene denitration catalyst and its preparation and application, the present invention will have the CeO with nanorod structure 2 -TiO 2 The base denitration catalyst is effectively coupled with graphene, and graphene is used to enhance its low-temperature denitration performance to solve the problem of CeO in the prior art. 2 -TiO 2 The problem of poor low temperature denitrification performance of base denitrification catalyst

Method used

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  • CeO2-TiO2 nanorod/graphene denitration catalyst as well as preparation and application thereof
  • CeO2-TiO2 nanorod/graphene denitration catalyst as well as preparation and application thereof
  • CeO2-TiO2 nanorod/graphene denitration catalyst as well as preparation and application thereof

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preparation example Construction

[0072] The invention provides a CeO 2 -TiO 2 Nanorod / graphene denitrification catalyst, which can be applied to NH 3 -In SCR reaction and denitrification of industrial coal-fired flue gas, its preparation method comprises the following steps:

[0073] 1) dissolving the precursor salt containing Ce element and the precursor salt containing Ti in water to prepare a mixed solution;

[0074] 2) add graphene to the mixed solution prepared in step 1), and stir to obtain a suspension;

[0075] 3) adding excess NaOH solution to the suspension prepared in step 2), stirring and mixing to obtain a slurry;

[0076] 4) transferring the slurry prepared in step 3) to a hydrothermal reaction kettle for high-temperature hydrothermal reaction;

[0077] 5) centrifuging, washing, drying, and roasting the product of the hydrothermal reaction in step 4) to obtain CeO 2 -TiO 2 Nanorod / graphene denitrification catalyst.

Embodiment 1

[0101] CeO 2 -TiO 2 Preparation of nanorod / graphene low-temperature denitrification catalyst (abbreviated as CT-NR / GR catalyst)

[0102] Accurately weigh 3.1263g (i.e. 7.2mmol) of Ce(NO 3 ) 3 ·6H 2 O, measure the TiCl of 8ml (ie 0.8mmol) 0.1mol / L 4 Dissolve the solution in 72ml of ultrapure water and stir evenly, then accurately weigh 0.0132g of single-layer graphene and add it to the above mixture for 3 hours to form a suspension; dissolve 38.4000g (ie 960mmol) of NaOH in 80ml of ultrapure water middle. Then, the NaOH solution was added dropwise to the above suspension, and magnetically stirred for 3 hours to mix evenly to form a slurry, ensuring that the pH was greater than or equal to 10. Then the mixed slurry was transferred to a 200ml hydrothermal reaction kettle, and reacted in a dry oven at 100°C for 24h. After cooling down to room temperature, centrifuge and wash with ultrapure water until the pH does not change (at 7), and there is no Cl - Detected (AgNO 3 de...

Embodiment 2

[0119] Accurately weigh 1.7368g (ie 4.0mmol) of Ce(NO 3 ) 3 ·6H 2 O, measure the TiCl of 40ml (ie 4.0mmol) 0.1mol / L 4 Dissolve the solution in 40ml of ultrapure water and stir evenly, then accurately weigh 0.0051g of single-layer graphene and add it to the above mixture for 3 hours to form a suspension; dissolve 38.4000g (ie 960mmol) of NaOH in 80ml of ultrapure water middle. Then, the NaOH solution was added dropwise to the above suspension, and magnetically stirred for 3 hours to mix evenly to form a slurry, ensuring that the pH was greater than or equal to 10. Then the mixed slurry was transferred to a 200ml hydrothermal reaction kettle, and reacted in a dry oven at 100°C for 24h. After cooling down to room temperature, centrifuge and wash with ultrapure water until the pH does not change (at 7), and there is no Cl - Detected (AgNO 3 detection). The product was dried in a drying oven at 70°C for 12 hours, and ground evenly. Finally, in a tube furnace, 300ml / min of N...

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Abstract

The invention provides a CeO2-TiO2 nanorod / graphene denitration catalyst as well as preparation and application thereof. A preparation method comprises the following steps: 1) dissolving precursor salt containing Ce element and precursor salt containing Ti in water to prepare a mixed solution; (2) adding graphene into the mixed solution, and uniformly stirring to obtain a turbid liquid; (3) adding excessive NaOH solution into the turbid liquid, and stirring and mixing to obtain a slurry; 4) transferring the slurry into a hydrothermal reaction kettle for high-temperature hydrothermal reaction; and 5) centrifuging, washing, drying and roasting the product of the hydrothermal reaction to obtain the catalyst. The prepared catalyst is excellent in low-temperature denitration performance, the needed raw materials are rich in resource, low in price and easy to obtain, the preparation technology is simple, operability is high, the process is safe, large-scale production can be achieved, and wide application prospects are achieved.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a CeO 2 -TiO 2 Nanorod / graphene denitration catalyst and its preparation and application. Background technique [0002] According to the 2014-2018 "China Ecological Environment Status Bulletin", my country's air quality has improved significantly, and the proportion of cities that meet the standards has increased year by year, but in 2018, 64.2% of the cities still had air quality exceeding the standard. In addition, scientific literature (PNAS.2019, 116, 24463-24469) pointed out that typical air pollutants nitrogen oxides (NO x ) pollution situation is still severe, especially industrial NO x The downward trend of emissions is not obvious. Therefore, industrial sources of NO x emission control is imminent. Ammonia-Selective Catalytic Reduction (Selective Catalytic Reduction of NO x by NH 3 , referred to as NH 3 -SCR), as the most efficient, mature and wid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01D53/86B01D53/56
CPCB01J23/10B01J23/002B01D53/8628B01D2251/2062B01D2258/0283
Inventor 姚小江赵婉霞骆雯荣静陈阳
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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