Catalyst for high-efficiency simultaneous catalytic oxidation of low-concentration gas-phase formaldehyde, carbon monoxide and hydrogen at room temperature and preparation method thereof
A technology for catalytic oxidation and carbon monoxide, which is applied in the field of air purification, can solve the problems of decreased catalytic activity, low oxidation activity, and decreased conversion rate of formaldehyde, etc., and achieves the effect of simple preparation method, simple preparation method, and high catalytic efficiency
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Embodiment 1
[0017] Take 2 grams of TiO 2 The powder was dispersed in 50ml of deionized water, and 11.0ml of Pt(NO 3 ) 2 The solution was soaked for 2 hours, and the excess water was removed by rotary evaporation at 70°C, then vacuum-dried at 80°C for 10 hours, and then calcined at 400°C for 6 hours in an air atmosphere. Redisperse 1 g of the obtained sample in 50 ml of deionized water, adjust and maintain the pH value of the suspension between 9 and 10 with NaOH solution, add 0.2 ml of NaAuCl 4 After the solution was stabilized at 60°C for 2 hours, the resulting precipitate was vacuum-dried at 80°C for 10 hours after repeated suction filtration and washed to free of chloride ions, and finally calcined at 200°C for 4 hours in an air atmosphere to obtain the catalyst material of Example 1. , where the loadings of platinum and gold were 1.55wt% and 0.11wt%, respectively.
Embodiment 2
[0019] Take 2 grams of TiO 2 The powder was dispersed in 50ml of deionized water, and 4.0ml of H 2 PtCl 6 The solution was impregnated for 6 hours, and the excess water was removed by rotary evaporation at 70°C, then vacuum-dried at 80°C for 8 hours, and then calcined at 400°C for 4 hours in an air atmosphere. Redisperse 1 gram of the obtained sample in 50 ml of deionized water to form a suspension, adjust and maintain the pH value of the suspension between 9 and 10 with NaOH solution, add 0.4 ml of HAuCl 4 After the solution was stabilized at 60°C for 6 hours, the resulting precipitate was vacuum-dried at 80°C for 8 hours after repeated suction filtration, washed with deionized water until it was free of chloride ions, and finally calcined at 200°C for 8 hours in an air atmosphere to obtain Example 2 Catalyst materials, wherein the loadings of platinum and gold are 0.74wt% and 0.15wt%, respectively.
Embodiment 3
[0021] Take 2 grams of TiO 2 The powder was dispersed in 50ml of deionized water to form a uniform suspension, and 2.5ml of Pt(NO 2 ) 2 (NH 3 ) 2 The solution was soaked for 4 hours, and the excess water was removed by rotary evaporation at 70°C, then vacuum-dried at 80°C for 12 hours, and then calcined at 400°C for 8 hours in an air atmosphere. Redisperse 1 g of the obtained sample in 50 ml of deionized water, adjust and maintain the pH value of the suspension between 9 and 10 with NaOH solution, add 1.0 ml of NaAuCl 4 After the solution was stabilized at 60°C for 4 hours, the resulting precipitate was vacuum-filtered and washed to be free of chloride ions several times, vacuumed at 80°C for 12 hours, and finally calcined at 200°C for 6 hours in an air atmosphere to obtain the catalyst material of Example 3. The loadings of platinum and gold were 0.44wt% and 0.53wt%, respectively.
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