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Organic contaminated soil thermal desorption waste gas catalytic oxidation purification catalyst and preparation method and application thereof

A technology for purifying catalysts and catalytic oxidation, which is applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of inconvenient natural gas acquisition, catalyst carbon deposition and sintering , the catalyst is easily deactivated, etc., to achieve the effect of weakening the limitation of oxygen transport, improving the resistance to alkali metals, and improving the catalytic performance

Active Publication Date: 2021-12-03
KUNMING UNIV OF SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

After the organic polluted soil is heated, the exhaust gas will be desorbed from the soil. The exhaust gas contains high concentrations of VOCs (especially refractory benzene ring macromolecules such as naphthalene and benzopyrene), and contains heavy metals, alkali metals, Alkaline earth metals, particulate matter, complex composition
The current process is to dedust the desorbed waste gas, which usually uses natural gas as fuel to burn the desorbed waste gas. In order to avoid the formation of dioxins, the temperature needs to be controlled at 1200-1400 ℃, and the heat consumption is very large. , and the cost is high
Moreover, the conventional thermal desorption treatment method is limited by local conditions. For example, it is not very convenient to obtain natural gas when processing in the field and other places.
[0004] At present, researchers in this field try to use catalysts to oxidize the desorbed exhaust gas to reduce its combustion temperature, but the effect is not good, mainly because the desorbed Exhaust gas catalytic oxidation catalyst has the following differences from conventional catalytic oxidation: 1. It belongs to high-temperature catalytic oxidation (naphthalene, benzopyrene and other refractory benzene ring macromolecules have high conversion temperature, and need to avoid the temperature range of dioxin formation) , and the catalyst is prone to carbon deposition and sintering under high temperature conditions; 2. The actual application environment is relatively complex (containing alkali, alkaline earth, heavy metals, water, and sulfur dioxide), so conventional catalysts are easily deactivated

Method used

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  • Organic contaminated soil thermal desorption waste gas catalytic oxidation purification catalyst and preparation method and application thereof
  • Organic contaminated soil thermal desorption waste gas catalytic oxidation purification catalyst and preparation method and application thereof
  • Organic contaminated soil thermal desorption waste gas catalytic oxidation purification catalyst and preparation method and application thereof

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preparation example Construction

[0039] The present invention also provides a method for preparing a catalytic oxidation purification catalyst for organic polluted soil thermal desorption exhaust gas described in the above scheme, comprising the following steps:

[0040] (1) Dissolve soluble cerium salt and soluble zirconium salt in water, or dissolve soluble cerium salt, soluble zirconium salt and R component in water to obtain an aqueous solution; adjust the pH value of the resulting aqueous solution to 9-12, and then Carrying out hydrothermal reaction and first roasting to obtain a carrier; the R component is one or more of soluble lanthanum salt, soluble cobalt salt, soluble yttrium salt and silica sol;

[0041] (2) impregnating the carrier in a mixed solution of a soluble manganese salt and a soluble ruthenium salt, and then performing a second roasting to obtain a catalyst component;

[0042] (3) Slurrying the catalyst component and coating it on the honeycomb cordierite, and then performing the third c...

Embodiment 1

[0060] Weigh cerium nitrate (50.45g) and zirconium nitrate (104.53g) in a beaker of 1000mL deionized water, stir at a speed of 1500rpm for 30min to form a homogeneous solution, then slowly drop ammonia water, adjust the pH value to 10, and continue stirring After uniformity, it was transferred to a stainless steel reactor for hydrothermal reaction at 160°C for 24 hours, and the resulting product liquid was cooled to room temperature, followed by filtration and water washing, and then dried at 80°C overnight, and the obtained hydrothermal product was roasted at 500°C for 4 hours to obtain a carrier . Immerse the carrier in a mixed solution of manganese nitrate and ruthenium chloride for impregnation, heat and stir until the water is evaporated to dryness, dry in an oven at 80°C overnight, put the obtained powder in a muffle furnace and roast at 2°C / min to 500°C After 4h, the catalyst component was obtained after cooling. Among them, the carrier is CeO 2 -ZrO 2 complex, where...

Embodiment 2

[0063] Weigh cerium nitrate (50.45g), zirconium nitrate (95.81g), and lanthanum nitrate (6.65g) in a beaker of 1000mL deionized water, stir at a speed of 1500rpm for 30min to form a homogeneous solution, then slowly drip ammonia water, and adjust the pH Adjust to 10, continue stirring, after stirring evenly, then transfer to a stainless steel reactor for 24 hours at 160°C, cool to room temperature, then filter and wash in sequence, then dry at 80°C overnight, and roast at 450°C for 4 hours to obtain the carrier. Immerse the carrier in a mixed solution of manganese nitrate and ruthenium chloride for impregnation, heat and stir until the water is evaporated to dryness, dry in an oven at 80°C overnight, put the obtained powder in a muffle furnace and roast at 2°C / min to 450°C After 4h, the catalyst component was obtained after cooling. Among them, the carrier is CeO 2 -ZrO 2 -La 2 o 3 complex, where CeO 2 Content is 40%, ZrO 2 The content is 55%, La 2 o 3 The content is 5...

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Abstract

The invention relates to the technical field of catalysts, and provides an organic contaminated soil thermal desorption waste gas catalytic oxidation purification catalyst and a preparation method and application thereof. The catalyst provided by the invention comprises a matrix, a carrier and active components, the matrix is honeycomb cordierite, the carrier is a CeO2-ZrO2 compound or a CeO2-ZrO2-R compound (R is one or more of La2O3, Co3O4, Y2O3 and SiO2), the active components are MnO2 and RuO2, and an auxiliary agent WO3-TiO2 is further loaded on the matrix. The catalyst provided by the invention has high catalytic efficiency in a temperature range of 450-650 DEG C, can completely convert organic contaminated soil thermal desorption waste gas, has good high-temperature stability, strong sintering resistance and carbon deposition resistance, and also has good alkali, alkaline earth and heavy metal resistance, chlorine resistance and sulfur poisoning resistance.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a catalytic oxidation purification catalyst for thermal desorption waste gas of organic polluted soil, a preparation method and application thereof. Background technique [0002] Soil is one of the main resources for human survival and an important part of the human ecological environment. With the rapid development of my country's economy, the problem of soil pollution has become increasingly prominent. Organic pollution in soil often includes petroleum hydrocarbons, polychlorinated biphenyls, Polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls and some difficult-to-degrade pesticides. The hydrophobicity of organic matter makes it potentially toxic and carcinogenic, and its bioavailability is weak, and it is easy to accumulate in the food chain. Therefore, the treatment of organic polluted soil has attracted widespread attention. [0003] Thermal desorption tech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/656B01J35/04B01D53/86B01D53/72
CPCB01J23/6562B01D53/8668B01J35/56Y02A50/20
Inventor 张秋林吴学勇陈金定陈建军刘墨
Owner KUNMING UNIV OF SCI & TECH
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