Composite catalyst, preparation method and application of composite catalyst in catalytic oxidation of VOCs
A technology of composite catalysts and oxides, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. It can solve the problems of high reaction temperature and high temperature resistance of catalysts, and improve the anti-sintering performance , high fluidity, strong high temperature stability effect
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[0047] The invention provides a kind of preparation method of composite catalyst, comprises the following steps:
[0048] S1: will contain Mn 2+ compound, KMnO 4 and the transition metal precursor salt are configured as the first solution, the transition metal precursor salt is one or more of Co salt, Zr salt and Fe salt, and further, the transition metal precursor salt is Co(NO 3 ) 2 , Zr(NO 3 ) 4 and Fe(NO 3 ) 3 one or more of them;
[0049] S2: Stir the first solution, and add the second solution until the pH value is 8-10 at a temperature of 40-100° C. to obtain a suspension. The second solution contains Na + solutions of compounds;
[0050] S3: Suction filtration of the suspension in step S2 to obtain a first solid powder, drying and roasting the first solid powder;
[0051] S4: adding the dried and calcined first solid powder and deionized water into a hydrothermal reaction kettle to perform a hydrothermal synthesis reaction to obtain a second solid powder, and ...
Embodiment 1
[0067] 12.89g mass fraction is 50% Mn(NO 3 ) 2 Aqueous solution, 3.79g KMnO 4 And a certain amount of transition metal precursor salt Zr(NO 3 ) 4 Prepare a 300mL solution; make the molar ratio of Mn ions and Zr ions 9:1, ultrasonicate for 5 minutes, and dissolve evenly; transfer the mixed material liquid to a water bath at 50°C-60°C to heat and stir at a stirring speed of 400r / min. Add a NaOH solution with a concentration of 1 mol / L dropwise at a rate of 1 mol / L until the pH value is 8-9, and obtain the first solid powder by suction filtration, and dry the first solid powder by suction filtration in an oven at 100°C for 12 hours.
[0068] The dried first solid powder was calcined in a muffle furnace at a heating rate of 5°C / min, raised to 650°C, calcined for 3 hours, cooled to below 100°C and taken out, and the dried and calcined first solid powder was recorded as 9 (Na-Mn-O) / ZrO 2 . figure 1 The first solid powder 9(Na-Mn-O) / ZrO dried and roasted for the present embodim...
Embodiment 2
[0081] 12.89g mass fraction is 50% Mn(NO 3 ) 2 Aqueous solution, 3.79g KMnO 4 and a certain amount of Fe(NO 3 ) 3 Prepared into a 300mL solution; wherein the transition metal precursor salt is Fe(NO 3 ) 3 , so that the molar ratio of Mn ions and Fe ions is 4:1, ultrasonic 5min, dissolve evenly; transfer the mixed material liquid to a water bath at 50°C-70°C and stir at a stirring speed of 400r / min, drop at a rate of 2d / s Add a NaOH solution with a concentration of 1 mol / L until the pH value is 8-9, filter with suction to obtain the first solid powder, and dry the filtered first solid powder in an oven at 90°C for 12h-15h. In this embodiment, NaOH solution can be replaced by Na 2 CO 3 solution, NaHCO 3 solution or other containing Na + compound of.
[0082] The dried first solid powder was calcined in a muffle furnace at a heating rate of 5°C / min to 500°C, calcined for 5h, cooled to below 100°C and taken out.
[0083] The dried and roasted first solid powder and 20-3...
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