Supported palladium catalyst with characteristic of specific infrared absorption

Abstract

The invention discloses a supported palladium catalyst with characteristic of specific infrared absorption, comprising a carrier, palladium and optional modifying component. For finding a noble metal catalyst with good catalytic performance accurately and effectively, the carbon monoxide adsorption in-situ infrared spectroscopy is used for testing the catalyst at the temperature of 40 DEG C, in the obtained infrared spectrum, the ratio of the area of a bridge type absorption peak at the value of 1930-1990 cm<-1> to the area of a bridge type absorption peak at the value of 1870-1930 cm<-1> is less than 0.2, and more preferably 0.15. In addition, preferably, the ratio of the peak height of an absorption peak at the value of 1870-1930 Cm<-1> in the in-situ infrared spectrogram obtained by testing the catalyst when being purged with nitrogen gas for 0 min to the peak height of an absorption peak at the value of 1800-1900 cm<-1> in the in-situ infrared spectrogram obtained by testing the catalyst when being purged with nitrogen gas for 15 min is less than 5, and more preferably 2. The catalyst has excellent reaction selectivity and activity, and the preparation method of the catalyst is easy to operate and saves energy.

Description

technical field

[0001] The invention relates to a supported palladium catalyst and a preparation method thereof. Background technique

[0002] Supported palladium (Pd) catalysts are widely used in industries such as hydrogenation, dehydrogenation, oxidation, decomposition and other reactions, such as Pd / Al 2 o 3 and Pd / SiO 2 For the production of vinyl acetate by gas phase method, Pd / molecular sieve for the production of gasoline and other fuels in hydrocracking process, Pd / Al 2 o 3 It is used for the selective hydrogenation of alkynes and diolefins in olefins and pyrolysis gasoline and the preparation of hydrogen peroxide. Pd / C is used for the hydrogenation of phenol to cyclohexanone, the hydrogenation of fatty acids and oils, etc. Supported palladium catalysts are also used in high-purity gas preparation, fuel cell electrodes, pharmaceutical production, and exhaust gas purification.

[0003] In practical applications, supported Pd catalysts are usually required to hav...

Examples

Embodiment 1

[0039] Take 13.5ml 10mg / ml PdCl 2 Solution, add 1mol / L NaOH solution dropwise to adjust the pH to 5.6, then spray to 100.0gAl 2 o 3 Spherical carrier surface, use 20ml of 50% v / v isopropanol aqueous solution to wet the carrier, and use it under vacuum 60 The Coγ radiation source was irradiated at room temperature for 15 hours, and the absorbed dose rate was 35Gy / min. After irradiation, the sample was placed in an oven, and dried at 80° C. and 120° C. for 12 hours in turn to obtain the catalyst A, which had a gray-black appearance and a Pd content of 0.135 wt%.

Embodiment 2

[0041] Take 30ml 10mg / ml PdCl 2 solution, sprayed to 100.0g of La and K modified Al 2 o 3 Spray 5ml of 1mol / L NaOH solution on the surface of the toothed spherical carrier, use 20ml of 50% v / v isopropanol aqueous solution to wet the carrier, and use it under vacuum 60 Coγ radiation was irradiated at room temperature for 15 hours, and the absorbed dose rate was 70Gy / min. After irradiation, the sample was placed in an oven, and dried at 80° C. and 120° C. for 12 hours in turn to obtain the catalyst B, which had a gray appearance and a Pd content of 0.300 wt%.

technical field

[0001] The invention relates to a supported palladium catalyst and a preparation method thereof. Background technique

[0002] Supported palladium (Pd) catalysts are widely used in industries such as hydrogenation, dehydrogenation, oxidation, decomposition and other reactions, such as Pd / Al 2 o 3 and Pd / SiO 2 For the production of vinyl acetate by gas phase method, Pd / molecular sieve for the production of gasoline and other fuels in hydrocracking process, Pd / Al 2 o 3 It is used for the selective hydrogenation of alkynes and diolefins in olefins and pyrolysis gasoline and the preparation of hydrogen peroxide. Pd / C is used for the hydrogenation of phenol to cyclohexanone, the hydrogenation of fatty acids and oils, etc. Supported palladium catalysts are also used in high-purity gas preparation, fuel cell electrodes, pharmaceutical production, and exhaust gas purification.

[0003] In practical applications, supported Pd catalysts are usually required to hav...

Examples

Embodiment 1

[0039] Take 13.5ml 10mg / ml PdCl 2 Solution, add 1mol / L NaOH solution dropwise to adjust the pH to 5.6, then spray to 100.0gAl 2 o 3 Spherical carrier surface, use 20ml of 50% v / v isopropanol aqueous solution to wet the carrier, and use it under vacuum 60 The Coγ radiation source was irradiated at room temperature for 15 hours, and the absorbed dose rate was 35Gy / min. After irradiation, the sample was placed in an oven, and dried at 80° C. and 120° C. for 12 hours in turn to obtain the catalyst A, which had a gray-black appearance and a Pd content of 0.135 wt%.

Embodiment 2

[0041] Take 30ml 10mg / ml PdCl 2 solution, sprayed to 100.0g of La and K modified Al 2 o 3 Spray 5ml of 1mol / L NaOH solution on the surface of the toothed spherical carrier, use 20ml of 50% v / v isopropanol aqueous solution to wet the carrier, and use it under vacuum 60 Coγ radiation was irradiated at room temperature for 15 hours, and the absorbed dose rate was 70Gy / min. After irradiation, the sample was placed in an oven, and dried at 80° C. and 120° C. for 12 hours in turn to obtain the catalyst B, which had a gray appearance and a Pd content of 0.300 wt%.

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