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Modification method of SCR catalyst for removing chlorobenzene in flue gas by catalytic combustion and catalyst

An SCR catalyst, catalytic combustion technology, applied in combustion methods, physical/chemical process catalysts, heterogeneous catalyst chemical elements, etc., can solve the problems of high cost, lack of economy, no synergistic consideration of NOx and chlorobenzene removal, etc. , to achieve the effect of broad application prospects, reduction of processing costs, and enhancement of catalytic combustion performance

Pending Publication Date: 2021-10-29
SUZHOU XIRE ENERGY SAVING ENVIRONMENTAL PROTECTION TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The above patents generally only focus on the catalytic combustion performance of volatile organic compounds such as chlorobenzene, and do not consider the synergistic removal of NOx and chlorobenzene
In addition, the methods disclosed in the above patents generally have high costs, and the economy is relatively lacking in the realization of industrialization

Method used

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  • Modification method of SCR catalyst for removing chlorobenzene in flue gas by catalytic combustion and catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] S1, take the typical V 2 o 5 -WO 3 / TiO 2 The catalyst is crushed and ground, and sieved with 200 mesh to obtain catalyst powder;

[0038] S2, add 300ml deionized water in 1L beaker, add 37g ammonium molybdate [(NH 4 ) 6 Mo 7 o 24 4H 2O] to form a modified precursor solution;

[0039] S3. Add 200g of vanadium-tungsten-titanium catalyst powder in step S1 to the modified precursor solution in step S2, and continue stirring at 45°C until the water evaporates to form a viscous slurry, remove the magnet and stop stirring;

[0040] S4. Place the beaker containing the viscous slurry in an oven at 90°C for 12 hours, transfer the dried modified catalyst to a crucible, place it in a muffle furnace for calcination at 500°C for 4 hours, and obtain Enhanced modified catalyst S1 for removing chlorobenzene.

Embodiment 2

[0042] The difference between embodiment two and embodiment one is: the quality of ammonium molybdate is different.

[0043] S1, take the typical V 2 o 5 -WO 3 / TiO 2 The catalyst is crushed and ground, and sieved with 200 mesh to obtain catalyst powder;

[0044] S2, add 300ml deionized water in 1L beaker, add 76g ammonium molybdate [(NH 4 ) 6 Mo 7 o 24 4H 2 O] to form a modified precursor solution;

[0045] S3. Add 200g of vanadium-tungsten-titanium catalyst powder in step S1 to the modified precursor solution in step S2, and continue stirring at 45°C until the water evaporates to form a viscous slurry, remove the magnet and stop stirring;

[0046] S4. Place the beaker containing the viscous slurry in an oven at 90°C for 12 hours, transfer the dried modified catalyst to a crucible, place it in a muffle furnace for calcination at 500°C for 4 hours, and obtain Enhanced modified catalyst S1 for removing chlorobenzene.

Embodiment 3

[0048] The difference between embodiment three and embodiment one is: the quality of ammonium molybdate is different.

[0049] S1, take the typical V 2 o 5 -WO 3 / TiO 2 The catalyst is crushed and ground, and sieved with 200 mesh to obtain catalyst powder;

[0050] S2, add 300ml deionized water in 1L beaker, add 104g ammonium molybdate [(NH 4 ) 6 Mo 7 o 24 4H 2 O] to form a modified precursor solution;

[0051] S3. Add 200g of vanadium-tungsten-titanium catalyst powder in step S1 to the modified precursor solution in step S2, and continue stirring at 45°C until the water evaporates to form a viscous slurry, remove the magnet and stop stirring;

[0052] S4. Place the beaker containing the viscous slurry in an oven at 90°C for 12 hours, transfer the dried modified catalyst to a crucible, place it in a muffle furnace for calcination at 500°C for 4 hours, and obtain Enhanced modified catalyst S1 for removing chlorobenzene.

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Abstract

The invention relates to a modification method of an SCR catalyst for removing chlorobenzene in flue gas by catalytic combustion and a catalyst. The method comprises the following steps of: S1, preparing a vanadium-titanium catalyst, and grinding the catalyst to obtain vanadium-titanium catalyst powder; S2, preparing a modified precursor and adding the modified precursor into a water solution to obtain a modified precursor solution which comprises one or more of manganese, chromium, copper, zirconium, niobium and molybdenum; S3, adding the vanadium-titanium catalyst powder into the modified precursor solution to form a mixed solution; and S4, drying and calcining the mixed solution in the step S3 so as to obtain a modified catalyst of which the active component is one or more of oxides of manganese, chromium, copper, zirconium, niobium and molybdenum. According to the method, the vanadium-titanium catalyst is modified, the catalytic combustion performance of the vanadium-titanium catalyst on chlorobenzene is enhanced while the NOx removal performance is guaranteed, then cooperative treatment of industrial furnace flue gas NOx and chlorobenzene is achieved, and the industrial furnace flue gas treatment cost can be greatly reduced.

Description

technical field [0001] The invention belongs to the field of modification of SCR denitrification catalysts, and in particular relates to an SCR catalyst modification method and a catalyst for catalytic combustion and removal of flue gas chlorobenzene. Background technique [0002] Due to the diversity and complexity of raw materials or fuels of non-electric boilers such as steel, waste incineration, and chemical industry, the flue gas emitted by some industrial furnaces often contains a large amount of nitrogen oxides (NOx) and chlorinated volatile organic compounds. For high-concentration NOx flue gas, selective catalytic reduction (SCR) is the most effective method. Among them, vanadium-based catalysts have excellent denitrification ability in the middle temperature range (300-400 ° C). Currently, the widely used SCR catalysts are mainly V 2 o 5 -WO 3 / TiO 2 Catalyst (vanadium tungsten titanium catalyst). [0003] Catalytic combustion method is an effective method to d...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01D53/86B01D53/56F23G7/07
CPCB01J23/30B01J23/002B01D53/8628F23G7/07B01D2258/0283B01J2523/00B01J2523/47B01J2523/55B01J2523/69
Inventor 何川孔凡海王丽朋张发捷李乐田吴国勋卞子君李昂
Owner SUZHOU XIRE ENERGY SAVING ENVIRONMENTAL PROTECTION TECH CO LTD
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