Catalyst for widening reaction temperature window of SCR (Selective Catalytic Reduction) catalyst and modification method
A technology of SCR catalyst and reaction temperature, applied in the direction of catalyst activation/preparation, heterogeneous catalyst chemical elements, chemical instruments and methods, etc., can solve the problems of catalyst channel micropore deformation, reduce catalyst activity, reduce denitrification efficiency, etc., to achieve Good temperature adaptability, avoid low temperature precipitation, and ensure the effect of dissolution
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Embodiment 1
[0033] A catalyst modification method of the present invention to widen the reaction temperature window of the SCR catalyst. In this embodiment, a honeycomb SCR catalyst monomer that has been operated for 24,000 hours is used as the material for illustration. The intercept of the catalyst monomer is 6.88 mm, and the pore diameter is 6.22 mm;
[0034] First, two small catalytic samples A and B with 6 × 6 holes were cut from the above-mentioned catalyst monomer as the SCR catalyst monomer for the experiment; at the same time, 351g (3mol) NH 4 VO 3 In the beaker, add an appropriate amount of demineralized water and stir well, then place the beaker in a constant temperature water bath, when the water temperature rises to 80°C, add ethanolamine solution to the beaker while stirring, each time add 50ml to NH 4 VO 3 Dissolve completely (add 250ml of ethanolamine in total), and finally make the solution volume up to 3L, and the volume concentration of the prepared NH 4 VO 3 solutio...
Embodiment 2
[0048] In the present embodiment, the NH of volume concentration 1-2mol / L 4 VO 3 The preparation of the solution is carried out at a constant temperature of 70°C, and the total amount of ethanolamine solution added is 300ml; the temperatures during the calcination process are 130°C and 600°C respectively;
[0049] The specific process is as follows,
[0050] First, the NH 4 VO 3 Add it into the desalted water, stir well and stir at a constant temperature of 70°C, add 30ml of ethanolamine solution each time until NH 4 VO 3 After the volume concentration reaches 1-2mol / L after complete dissolution, it is used as an impregnating liquid for later use; the SCR catalyst monomer is placed in the impregnating liquid for impregnation;
[0051] Secondly, the impregnated SCR catalyst monomer is naturally air-dried at room temperature;
[0052] Finally, the air-dried SCR catalyst monomer is calcined, and the calcining process is as follows:
[0053] Ⅰ), from room temperature to 130...
Embodiment 3
[0058] In the present embodiment, the NH of volume concentration 1-2mol / L 4 VO 3 The preparation of the solution is carried out at a constant temperature of 90°C, and the total amount of ethanolamine solution added is 200ml; the temperatures during the calcination process are 120°C and 570°C respectively;
[0059] The specific process is as follows,
[0060] First, the NH 4 VO 3 Add to the desalinated water, stir well and stir at a constant temperature of 90°C, add 40ml each time, ethanolamine solution until NH 4 VO 3 After the volume concentration reaches 1-2mol / L after complete dissolution, it is used as an impregnating liquid for later use; the SCR catalyst monomer is placed in the impregnating liquid for impregnation;
[0061] Secondly, the impregnated SCR catalyst monomer is naturally air-dried at room temperature;
[0062] Finally, the air-dried SCR catalyst monomer is calcined, and the calcining process is as follows:
[0063] Ⅰ), from room temperature to 120°C, ...
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Abstract
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