Waste platinum catalyst recovering method
A waste catalyst and reducing agent technology, applied in chemical instruments and methods, catalyst regeneration/reactivation, physical/chemical process catalysts, etc., can solve problems such as limited activation effect, easily damaged catalyst microstructure, and secondary environmental pollution. Achieve the effects of low environmental impact, high catalytic activity, and mild method conditions
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Embodiment 1
[0021] Using waste platinum-tin reforming catalyst as raw material, and its platinum content is ~0.2%, the organic waste gas combustion catalyst is prepared according to the method of the present invention. The platinum waste catalyst is ground and screened into fine particles with a particle size of 20-200 mesh. 0.5 g was weighed into a muffle furnace, heated to 400°C at a heating rate of 10°C / min, and calcined in an air atmosphere of 400°C for 6 hours. After natural cooling, it was added to 50 mL of 0.01 mol / L sodium borohydride solution, sonicated for 0.5 hours, stirred for 4 hours under reflux at 25°C, stood for 20 hours, filtered, and dried at 120°C for 12 hours to obtain organic waste gas. Burn the catalyst.
[0022] The activity of the organic waste gas combustion catalyst prepared above was measured in a laboratory small-scale fixed-bed reaction device. The combustion reaction of trace toluene in air was chosen as the model reaction, the initial concentration of tolu...
Embodiment 2
[0025] Using waste platinum-tin reforming catalyst as raw material, and its platinum content is ~0.2%, the organic waste gas combustion catalyst is prepared according to the method of the present invention. The platinum waste catalyst is ground and screened into fine particles with a particle size of 20-200 mesh. Weigh 0.5 g into 50 mL of distilled water, add 0.1 mol / L NaOH solution to the solution to adjust pH=10, stir for 1 hour under constant temperature and reflux conditions at 70 °C, and then add 5 mL of formaldehyde solution (37% -40%, Guangzhou Chemical Reagent Factory), under the conditions of constant temperature and reflux at 70 °C, stirring for 1 hour, filtering, and drying at 120 °C for 12 hours, the organic waste gas combustion catalyst was obtained. The oxidation activity of the prepared catalyst was measured according to the same operation steps as in Example 1, and the results are shown in Table 1.
[0026]
Embodiment 3
[0028] Using waste platinum-tin reforming catalyst as raw material, and its platinum content is ~0.2%, the organic waste gas combustion catalyst is prepared according to the method of the present invention. The platinum waste catalyst is ground and screened into fine particles with a particle size of 20-200 mesh. Weigh 0.5 g into the extraction kettle, set the extraction kettle temperature to 60 °C, and adjust the extraction kettle pressure to 10 Mpa, so that the organic non-polar impurities covered on the spent catalyst are dissolved in CO. 2 In fluid, supercritical CO 2 The extraction time was 4h. Add the extracted catalyst particles to 50 mL of distilled water, add 5 mL of formaldehyde solution (37%-40%, Guangzhou Chemical Reagent Factory) to the solution, stir for 1 hour at a constant temperature of 90 °C and reflux, filter, After drying at 120°C for 12 hours, the organic waste gas combustion catalyst was prepared. The oxidation activity of the prepared catalyst was mea...
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