A metal single-atom site catalyst and its preparation method and application
A catalyst and atomic technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as side reactions and poor stability of single-atom catalysts, and achieve simple steps, low toxicity of raw materials, and low cost low effect
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[0031]The present invention provides a method of preparing a metal single atom site catalyst, comprising the steps of:
[0032]The acetylacetone metal salt, nitrate, 2-methylimidazole and methanol were mixed to obtain a mixed suspension, the acetylacetonate metal salt of acetylacettone (II), acetylacetonate palladium (II), acetylacetone copper (Ii) or acetylacetonate (III);
[0033]The mixed suspension was subjected to microwave hydrothermal reaction to obtain a single atomic catalyst precursor;
[0034]The single atomic catalyst precursor is subjected to microwave plasma chemical vapor deposition in modified gases to obtain the metal mono-atom site catalyst, which comprises nitrogen-containing gases, phosphorous gases and sulfur-containing gases. One or more.
[0035]The present invention cooperates with a acetylacetonate metal salt, nitrate, 2-methylimidazole, and methanol, to obtain a mixed suspension, the acetylacetonate metal salt is acetylacetone (II), acetylacetonate palladium (II), acet...
Embodiment 1
[0051]79 mg (mg) acetylacetone (III) and 1.348 g (g) hexahydrate were dissolved in 15 ml of methanol, and 1.741 g (G) 2-methylimidazole was added to 10 ml of methanol. 2-methylimetazole solution was poured into a methanol solution of acetylacetonate (III) and aluminum nitrate aluminum, stirred vigorously for 15 minutes, mixed suspension transferred to a chemical reaction in a microwave water heat reaction kettle, microwave hydrothermal reaction The temperature was 140 ° C, the holding time was 240 min, and the hydrothermal reaction was evaporated to the single atom catalyst precursor. The precipitate obtained by the reaction was washed with methanol, and dried in a vacuum oven. The resulting powder is slightly ground after placing it into a microwave plasma chemical vapor deposition reactor, accessing H2S, the ventilation is 100ml / min, open the power supply, and the microwave plasma chemical vapor deposition treatment catalyst, the microwave power is 1 kW, the temperature is 600 °...
Embodiment 2
[0054]Using the same mono-atomic catalyst preparation method in Case 1, the obtained dry single atom catalyst precursor is placed in a microwave plasma chemical vapor deposition reactor, and passing the pH.3The amount of ventilation is 100 ml / min; opening the power supply, using a microwave plasma chemical vapor deposition treatment catalyst, the microwave power is 1 kW, the temperature is 800 ° C, the treatment time is 160 min, the microwave plasma chemical vapor deposition modification is produced by phosphorus Iron single atomic site catalyst.
[0055]This implementation case has been obtained by catalytic hydrolysis of phosphorus doped iron monotomogen sites.2, COS, HCN removal efficiencyimage 3 Indicated.
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