Monatomic catalyst and application thereof in carbon dioxide hydrogenation reaction
A carbon dioxide and catalyst technology, which is applied to a single-atom catalyst and its application field in carbon dioxide hydrogenation, and achieves the effect of a simple preparation method
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Embodiment 1
[0031] (1) Add 1 g of palladium acetylacetonate and 200 g of cerium acetylacetonate into a ball mill, and ball mill at 500 rpm for 10 h. The resulting solid was then calcined at 450°C for 3 h in an air atmosphere to obtain a Pd / CeO with a Pd content of 0.4%. 2 catalyst.
[0032] figure 1 In the transmission electron microscope image of the catalyst prepared for this example, no Pd particles were found in this image, only lattice fringes of the carrier, indicating that Pd was in a highly dispersed state on the catalyst carrier. In addition, the dispersion of Pd was measured by the CO pulse adsorption method, and the dispersion of Pd was as high as 98.1%. It is considered that Pd on the catalyst is in a monodisperse state, and the catalyst is a single-atom catalyst.
[0033] (2) Activity test: with reference to the aforementioned "catalyst performance evaluation", the prepared catalyst is evaluated for catalytic activity in a fixed-bed reactor, and the reaction conditions are:...
Embodiment 2
[0035](1) Add 1 g of palladium acetylacetonate and 400 g of cerium acetylacetonate into a ball mill, and ball mill at 500 rpm for 10 h. The resulting solid was then calcined at 450°C for 3 h in an air atmosphere to obtain a Pd / CeO with a Pd content of 0.2%. 2 For the catalyst, the dispersion degree of Pd was measured by the CO pulse adsorption method, and the measured dispersion degree of Pd was 99.3%.
[0036] (2) The reaction conditions of the activity test are the same as in Example 1, and the results of the activity test are shown in Table 1.
Embodiment 3
[0038] (1) Add 1 g of palladium acetylacetonate and 600 g of cerium acetylacetonate into a ball mill, and ball mill at 500 rpm for 10 h. The resulting solid was then calcined at 450°C for 3 h in an air atmosphere to obtain a Pd / CeO with a Pd content of 0.1%. 2 For the catalyst, the dispersion degree of Pd was measured by the CO pulse adsorption method, and the measured dispersion degree of Pd was 99.5%.
[0039] (2) The reaction conditions of the activity test are the same as in Example 1, and the results of the activity test are shown in Table 1.
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