Silver-gold bimetallic catalyst, preparation method and application thereof, and preparation method of alkylene oxide
A bimetallic catalyst and catalyst technology, applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, chemical instruments and methods, etc., can solve the problems of high silver loading, inapplicable preparation methods, and reaction conditions Harsh and other issues, to achieve good activity and selectivity effect
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Embodiment 1
[0072]Mix 17.5g of ethylenediamine, 6.5g of ethanolamine and 39.6g of deionized water to obtain a mixed solution, slowly add 35.5g of silver oxalate to the mixed solution while stirring, keep the temperature of the solution at 0-15°C to completely dissolve the silver oxalate. Then add 0.083g of lithium hydroxide, 0.076g of strontium sulfate, 0.101g of cesium hydroxide, 0.099g of perrhenic acid and 0.037g of ammonium molybdate to form a silver-containing impregnation solution for use. Take 10 g of the α-alumina carrier and place it in a container, evacuate it to below 10 mmHg, then add the above-mentioned silver-containing impregnating solution into it to immerse the carrier, keep it for 30 minutes, and drain off the excess impregnating solution. Then, it was baked in an air stream at 300° C. for 5 minutes, and the obtained solid was referred to as a silver-carrying carrier.
[0073] Dissolve 0.6g of chloroauric acid and 0.5g of polyvinylpyrrolidone in 20g of deionized water to...
Embodiment 2
[0075] Dissolve 0.6g of chloroauric acid and 0.5g of polyvinylpyrrolidone in 20g of deionized water to prepare a gold-containing impregnating solution for use. Take 10 g of the α-alumina carrier and place it in a container, vacuumize it to below 10 mmHg, then add the above-mentioned gold-containing impregnating solution into it to submerge the carrier, keep it for 30 minutes, and drain off the excess impregnating solution. Take another 1.57g of potassium borohydride and 50g of deionized water to prepare a reducing agent solution, and immerse the solid impregnated with the gold-containing impregnating solution in the reducing agent solution for 60 minutes, and then drain the solution. The reduced solid was dried in a drying oven at 80° C. for 120 minutes, and the obtained solid was recorded as a gold carrier.
[0076] Mix 17.5g of ethylenediamine, 6.5g of ethanolamine and 39.6g of deionized water to obtain a mixed solution, slowly add 35.5g of silver oxalate to the mixed soluti...
Embodiment 3
[0078] The catalyst was prepared according to the method of Example 1, except that the "1.57g potassium borohydride" in Example 1 was changed to "8.82g sodium citrate", and other conditions were the same as in Example 1 to prepare catalyst S3.
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