Pd/CeO2 catalyst, and synthesis and application thereof
A technology of catalysts and supported catalysts, applied in the regulation of CeO2 nanocube crystal plane reconstruction, synthesis of cerium oxide supported Pd nanoparticle catalysts, Pd/CeO2 catalyzed low-temperature combustion reaction of methane, synthesis of cerium oxide nanocubes, Pd/CeO2 Catalyst field
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Embodiment 1
[0057] 3.47g Ce(NO 3 ) 3 ·6H 2 O and 32g NaOH were dissolved in 40mL water respectively, mixed and stirred for 30min. Subsequently, the purple slurry was transferred to a 100 mL reactor and subjected to hydrothermal treatment at 155° C. for 24 h. After the reaction kettle was cooled to room temperature, the product was suction-filtered, washed with deionized water until neutral, and dried at 80°C for 12 hours to obtain light yellow CeO 2 Solid powder, which belongs to the fluorite face-centered cubic structure, its XRD spectrum is shown in figure 1 a; HRTEM image see figure 1 c, d, The results show that the cerium oxide is cubic; the size distribution is shown in figure 1 b, The average side length is 18.3 nm, and the side length range is 5-55 nm, 70% of which are in the range of 12-20 nm.
Embodiment 2
[0059] Investigate the influence of reactant concentration on the cubic size of cerium oxide prepared in embodiment 1, the concrete steps are as follows:
[0060] (1) 1.73g Ce(NO 3 ) 3 ·6H 2 O and 32g NaOH were dissolved in 40mL water respectively, mixed and stirred for 30min; then the purple slurry was transferred to a 100mL reactor and hydrothermally treated at 155°C for 24h. After the reaction kettle was cooled to room temperature, the product was suction-filtered, washed with deionized water until neutral, and dried at 80°C for 12 hours to obtain light yellow CeO 2 Solid powder, see TEM picture figure 2 a, the result shows that the cube size of cerium oxide is an average side length of 12.4nm, and the range of side length is 5-25nm. Compared with the sample size obtained in Example 1, it can be found that when NaOH is quantified, after the concentration of cerium source decreases, the cube size of cerium oxide decreases. Small.
[0061] (2) 6.94g Ce(NO 3 ) 3 ·6H 2...
Embodiment 3-5
[0065] Take the solid powder in Example 1 and roast it in a muffle furnace at 500°C for 4h, and the obtained sample is marked as CeO 2 -500; analyzed by XRD to be cerium oxide, which belongs to the fluorite face-centered cubic structure, and its XRD spectrum is shown in image 3 a; HRTEM image see Figure 4 a, The results show that the cubic size of cerium oxide is 20.2nm on average, the side length ranges from 7-55nm, and the specific surface area is 38.6m 2 / g, the main exposed surfaces are six {100} surfaces, which occupy the outer surface of the crystal (excluding the jagged {111} surfaces, only the {100} surfaces, truncated {110} surfaces and truncated angle {111 } surface) has an area ratio of 84.8%; the edge of the cube is cut by the {110} surface, which accounts for 14.4% of the crystal's outer surface area, forming a truncated surface, and the zigzag shape extending along the edge direction Composition of {111} faces (the ratio of jagged {111} and {110} faces is about...
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