Sintering-resisting loading type nanometer palladium catalyst and preparing method and application thereof
A supported catalyst technology, which is applied in the field of anti-sintering nano-Pd catalysts, can solve the problems of industrial application limitations, long preparation cycle, cumbersome preparation process, etc., and achieve improved anti-sintering performance, excellent CO ignition performance, and improved dispersion. Effect
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[0025] Example 1
[0026] Weigh 10g SiO 2 The carrier (Aldrich Chemical Company, 35~60 mesh), soaked in 20% dilute nitric acid solution for 24h, stirred 3~5 times during the period, then washed with distilled water to pH=7.0, dried at 110°C for 12h, and set aside. 2g of processed SiO 2 Soaked in 6ml Pd with a mass concentration of 1.04mg / ml for 24h, then dried at 110°C for 12h, roasted in air at 800°C for 2h, heating rate 10°C / min, and 600°C in high purity hydrogen C reduction for 0.5h to obtain 3wt%Pd / SiO 2 -800-Air catalyst, denoted as Cat 1, the particle size of Pd particles is 3.1nm, see figure 1 with 2 .
[0027] Weigh 10 mg of the above catalyst Cat 1 into a micro fixed-bed flow reactor. 2 In the air flow, the temperature is increased to 600°C at a rate of 20°C / min, reduced for 30 minutes, and reduced to room temperature, then use high purity He to purge for about 20 minutes, and then switch to CO / O 2 / He (1 / 1 / 98, volume ratio) reactant gas for heating up reaction, the heatin...
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[0034] Example 2
[0035] The implementation steps and conditions are the same as in Example 1, except that the catalyst calcination atmosphere is changed from air to N 2 , Get 3wt%Pd / SiO 2 -800-N 2 The catalyst, denoted as Cat 2, the particle size of Pd particles is 3.8nm, see Figure 5 with 6 , Its CO oxidation reaction performance results are shown in Table 1.
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[0038] Example 3
[0039] The implementation steps and conditions are the same as in Example 1, except that acetylacetone used as the solvent for palladium acetylacetonate is replaced with toluene to obtain 3wt%Pd / SiO 2 -800-Air-2 catalyst, denoted as Cat 3, the particle size of Pd particles is 3.1nm, and its CO oxidation reaction performance results are shown in Table 1.
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