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A kind of supported spherical activated carbon catalyst and preparation method thereof

A spherical activated carbon and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of low utilization efficiency of precious metals, unstable catalyst performance, small specific surface area of ​​the carrier, etc., and achieve high catalytic activity And the effect of stability, small resistance and high mechanical strength

Active Publication Date: 2016-08-17
中国船舶集团有限公司第七一八研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cost of the catalyst is high, the performance of the catalyst is unstable, and deactivation is prone to occur
[0008] Catalysts in the prior art generally use binary supports, that is, coating porous oxides on cordierite or alloys to make supports, which have disadvantages such as weak binding force between the binary components of the support and small specific surface area of ​​the support, resulting in catalyst strength. Disadvantages such as low cost, easy powder loss, low utilization efficiency of precious metals, and high cost

Method used

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  • A kind of supported spherical activated carbon catalyst and preparation method thereof
  • A kind of supported spherical activated carbon catalyst and preparation method thereof
  • A kind of supported spherical activated carbon catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039](1) Mix 1000g of asphalt with a softening point of 230°C and 500g of naphthalene into a high-pressure reactor with a volume of 2L, heat to 200°C and stir for 3 hours, cool down to 100°C, take out and cool to obtain a block mixture, and the block The mixture was crushed and sieved to obtain modulated asphalt with a particle size of 0.6 mm to 1.5 mm; 2 wt % de polyvinyl alcohol aqueous solution was used as a dispersant at 110 ° C and the stirring speed was 300 rpm to prepare asphalt balls in a reactor; The asphalt balls were heated to 300 °C at a heating rate of 0.2 °C / min in the air and kept for 6 hours for oxidation and non-melting treatment; the asphalt balls after oxidation and non-melting treatment were heated to 300 °C at a heating rate of 5 °C / min under nitrogen protection. After carbonization at 600°C for 2h, the temperature was raised to 800°C and water vapor was introduced for activation treatment. The activation time was 1.5h, and the pitch-based spherical activa...

Embodiment 2

[0042] (1) Mix 1000g of asphalt with a softening point of 280°C and 500g of naphthalene into a high-pressure reactor with a volume of 2L, heat to 250°C and stir for 3 hours, cool down to 100°C, take it out and cool it to obtain a block mixture. The mixture was crushed and sieved to obtain modulated asphalt with a particle size of 0.6 mm to 1.5 mm; 2 wt % polyvinyl alcohol aqueous solution was used as a dispersant to prepare asphalt balls in a reactor at 110 ° C and a stirring speed of 300 rpm; The asphalt balls were heated to 300 °C at a heating rate of 0.2 °C / min in the air and kept for 6 hours for oxidation and non-melting treatment; the asphalt balls after oxidation and non-melting treatment were heated to 300 °C at a heating rate of 5 °C / min under nitrogen protection. After carbonization at 600°C for 2h, the temperature was raised to 800°C and water vapor was introduced for activation treatment. The activation time was 1.5h, and the pitch-based spherical activated carbon wa...

Embodiment 3

[0045] The spherical activated carbon carrier that embodiment 2 step (1) is made in containing PtCl 2 Immersed in the ethanol aqueous solution for 4h, the mass percent of ethanol in the ethanol aqueous solution is 50%, the mass ratio of the carrier and the ethanol aqueous solution is 1:2, based on the total mass of the catalyst, the Pt mass percent is 0.3%, after the impregnation The catalyst carrier was dried at 110°C, and then reduced in hydrogen at 400°C for 3 hours to obtain a supported spherical activated carbon catalyst.

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Abstract

The invention relates to a supported spherical activated carbon catalyst and a preparation method thereof, belonging to the technical field of chemical catalysts. The catalyst is supported by Pt or Pd or both, with an average diameter of 0.6-1.5mm and a specific surface area of ​​≥600m 2 / g, the surface of spherical activated carbon carrier with dust rate <0.5%. By mixing pitch and naphthalene and heating it, then preparing pitch balls by suspension method, and then performing oxidation infusion, carbonization and activation treatment in sequence to obtain pitch-based spherical activated carbon, which is washed with acid and water until neutral to obtain a catalyst carrier; The catalyst is obtained by impregnating the carrier in an alcoholic aqueous solution containing a metal precursor, drying it and reducing it with hydrogen or a reducing solution. The catalyst carrier has high specific surface area, high metal utilization rate, smooth catalyst surface, uniform shape, small resistance, high mechanical strength, low dust rate, long service life, and high catalytic activity and stability for formaldehyde at room temperature .

Description

technical field [0001] The invention relates to a supported spherical activated carbon catalyst and a preparation method thereof, in particular to a supported spherical activated carbon catalyst for purifying formaldehyde at room temperature and a preparation method thereof, belonging to the technical field of chemical catalysts. Background technique [0002] Formaldehyde, also known as formaldehyde, is one of the most important pollutants in the indoor environment and has a strong carcinogenic effect. Studies have shown that formaldehyde is a highly toxic substance. Short-term exposure can irritate the eyes, nasal cavity and respiratory tract. Long-term exposure to low-dose formaldehyde can increase the possibility of nasopharyngeal cancer and leukemia. The concentration limit of formaldehyde pollutants in indoor air stipulated by my country's national standards is 0.08mg / m 3 . At present, the concentration of formaldehyde in the indoor environment of our country exceeds ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/42B01J23/44B01J35/08B01D53/86B01D53/72
Inventor 焦桂萍尹燕华陈红香祝维燕赵罗生程金斌艾长波
Owner 中国船舶集团有限公司第七一八研究所
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