Rare earth doped ZIF-8 nanoporous carbon catalyst, and preparation method and application thereof

A technology of ZIF-8 and nanoporous carbon, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, heterogeneous catalyst chemical elements, etc., can solve the problems of poor oxidation resistance and desulfurization efficiency, and achieve high low-temperature activity , good selectivity and large specific surface area

Pending Publication Date: 2020-05-29
ANHUI YUANCHEN ENVIRONMENTAL PROTECTION SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The defects of this technology are as follows: the highest denitrification efficiency is only 92.6%, the desulfurization efficiency is poor, SO 2 The antioxidant rate is poor

Method used

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  • Rare earth doped ZIF-8 nanoporous carbon catalyst, and preparation method and application thereof
  • Rare earth doped ZIF-8 nanoporous carbon catalyst, and preparation method and application thereof
  • Rare earth doped ZIF-8 nanoporous carbon catalyst, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A preparation method based on rare earth doped ZIF-8 nanoporous carbon catalyst, comprising the following steps:

[0037] (1) 11.5g Zn(NO 3 ) 2 ·6H 2 O was dissolved in 800mL of anhydrous methanol, and 25.4g of 2-methylimidazole was added under stirring, then 37.5mL of 15%wt% ammonia water was added, and the reaction was stirred at room temperature, and the mixed solution obtained by the reaction was washed 3 times with methanol, Vacuum drying at 60°C for 12 hours to obtain powder ZIF-8;

[0038] (2) Take 15g ZIF-8 powder and disperse it in 600mL absolute ethanol, then add 4.34g Ce(NO 3 ) 3 ·6H 2 O and 4.33g La(NO 3 ) 3 ·6H 2 O, after 20KHz ultrasonic dissolution for 0.5h, let it stand at room temperature for 8h, and rotate to dryness at 60°C to obtain La-Ce / ZIF-8-1;

[0039] (3) Take 12g La-Ce / ZIF-8 powder sample and place it in a tube furnace, calcinate it at 800°C for 1h in an argon atmosphere, with a heating rate of 5°C / min, and cool naturally to obtain LaC...

Embodiment 2

[0043] A preparation method based on rare earth doped ZIF-8 nanoporous carbon catalyst, comprising the following steps:

[0044] (1) 10.6g Zn(NO 3 ) 2 ·6H 2 O was dissolved in 800mL of anhydrous methanol, 28.9g of 2-methylimidazole was added under stirring conditions, and then 37.5mL of 15%wt% ammonia water was added, and the reaction was stirred at room temperature, and the mixed solution obtained by the reaction was washed 5 times with methanol , vacuum-dried at 60°C for 12 hours to obtain powder ZIF-8;

[0045] (2) Take 15g ZIF-8 powder and disperse it in 600mL absolute ethanol, then add 4.34g Ce(NO 3 ) 3 ·6H 2 O and 24.53 g LaCl 3 , after 20KH sonication for 1h, let it stand at room temperature for 12h, and spin dry at 60°C to get La-Ce / ZIF-8-2;

[0046] (3) Take 12g of La-Ce / ZIF-8 powder sample and place it in a tube furnace, calcinate at 800°C for 1h under argon atmosphere, with a heating rate of 5°C / min, and cool naturally to obtain LaCeO x / NPC-2;

[0047] (4)...

Embodiment 3

[0050] The denitration catalytic activity of the rare earth-doped ZIF-8 nanoporous carbon catalyst prepared in Example 1-2 was determined.

[0051] Using SCR catalytic reaction system to evaluate the MnO prepared in this example x -LaCeO x / NPC-Al 2 o 3 -1 The denitrification catalytic activity of the catalyst; the SCR catalytic reaction system consists of a fixed bed reaction device and a tubular resistance furnace, wherein the fixed bed is a quartz tube with an inner diameter of 0.8cm and a length of 40cm to heat the fixed bed reaction device through the tubular resistance furnace , the temperature of the fixed-bed reaction device is controlled by a program temperature controller, and the SCR catalytic reaction temperature range is 50-390°C.

[0052] Adopt standard GB / T7702.20-2008 coal-based granular activated carbon test method to the specific surface area (m 2 g -1 ), pore volume (cm 3 g -1 ) and average pore diameter (nm) were measured.

[0053] Table 1 is the sp...

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Abstract

The invention discloses a preparation method of a rare earth doped ZIF-8 nanoporous carbon catalyst, and relates to the field of environment-friendly catalytic materials. The method is provided against the problems of poor sulfur resistance and low-temperature catalytic performance of an existing denitration catalyst. The preparation method comprises the following steps: taking ZIF-8 as a precursor, impregnating a rare earth metal salt in the pore channels of the precursor, carrying out heat treatment in the presence of an inert gas to make the ZIF-8 form nanoporous carbon and make rare earthsalt converted into an oxide attached to the interior of the porous carbon in order to obtain the rare earth oxide modified nanoporous carbon (NPC), grinding and fully mixing the rare earth oxide modified nanoporous carbon (NPC) and nanoscale gamma-Al2O3 to obtain a composite carrier, and finally impregnating and loading a MnOx active component to obtain the target catalyst. The invention also discloses an application of the rare earth doped ZIF-8 nanoporous carbon catalyst. The catalyst has the advantages of excellent NOx removal efficiency under the low-temperature condition, the denitrationefficiency at 150 DEG C reaches 95%, and the overall specific surface area and SO2 poisoning resistance of the catalyst are improved through a special composite structure.

Description

technical field [0001] The invention relates to the field of environment-friendly catalytic materials, in particular to a rare earth-doped ZIF-8 nanoporous carbon catalyst and its preparation method and application. Background technique [0002] At present, the commercially widely used flue gas denitrification catalysts are mainly vanadium / titanium catalysts, which have good denitrification performance between 300 and 400 °C. However, the active component vanadium of this type of catalyst is toxic, which is harmful to humans and the environment, and it is easy to release SO in the flue gas. 2 converted to SO 3 , SO 3 It will form ammonium sulfate with other substances, cover active sites, block catalyst channels, and accelerate catalyst deactivation. In addition, the low-temperature activity of vanadium / titanium-based catalysts is poor, and it is difficult to fully exert its catalytic performance for the actual medium and low temperature (150-300°C) working conditions of ...

Claims

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Application Information

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IPC IPC(8): B01J23/10B01J37/08B01J35/10B01J37/02B01J23/34B01D53/86B01D53/56
CPCB01J23/10B01J37/08B01J37/0201B01J23/34B01J23/002B01D53/8628B01D2258/0283B01J2523/00B01J35/615B01J35/635B01J35/647B01J2523/3706B01J2523/3712B01J2523/72Y02A50/20
Inventor 王光应梁燕赵羽崔鹏
Owner ANHUI YUANCHEN ENVIRONMENTAL PROTECTION SCI & TECH
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