Catalyst and preparation method for encapsulating gold nanoparticles in molecular sieve crystals
A gold nanoparticle and nanoparticle technology, which is applied in the application field of high-temperature carbon monoxide oxidation reaction, to achieve the effect of small particle size, uniform distribution and high anti-sintering performance
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Embodiment 1
[0021] Example 1: Take 10 g of tetraethyl orthosilicate, add 32 ml of 0.12 M hydrochloric acid aqueous solution therein, adjust the hydrolysis pH value of the solution to 1.0, stir and hydrolyze at 20 ° C for 12 hours, then add 0.75 g of aluminum sulfate and 0.8 g of hydrogen Sodium oxide, after stirring and aging for 10h, add chloroauric acid 0.1g to this again, stir for 0.5h, so that the mol ratio of the total composition of the mixture is SiO 2 :0.05Al 2 o 3 :40H 2 O: 0.005Au, which was then packaged into a high-pressure dynamic hydrothermal reactor, crystallized at 180°C for 48 hours, washed to neutrality, centrifuged, dried, and calcined to obtain Au@ZSM-5 molecular sieves. Its X-ray diffraction pattern (XRD) see figure 1 in a.
[0022] Catalyst evaluation method: The catalytic oxidation reaction of carbon monoxide is carried out in a fixed-bed quartz reactor. The amount of catalyst used was 10mg, the feed gas was carbon monoxide and oxygen, the flow rate of the mixe...
Embodiment 2
[0023] Example 2: According to the operating steps and operating conditions of Example 1, the difference is that the addition of chloroauric acid is increased to 0.6g, the crystallization time is 72h, and the final product obtained is Au@ZSM-5 catalyst. The evaluation method of the catalyst is the same as in Example 1. The activity test shows that the activity of the Au@ZSM-5 catalyst prepared by this method remains unchanged in the carbon monoxide oxidation reaction at 400 °C for 8 days.
Embodiment 3
[0024] Example 3: According to the operation steps and operating conditions of Example 1, the difference is that the silicon source is methyl orthosilicate, the acid solution for hydrolyzing the silicon source is hydrochloric acid, and the final product obtained is Au@ZSM-5 catalyst. The XRD pattern of the product is shown in figure 1 in b. The evaluation method of the catalyst is the same as in Example 1. The activity test shows that the activity of the Au@ZSM-5 catalyst prepared by this method remains unchanged in the carbon monoxide oxidation reaction at 400 °C for 8 days.
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