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Synthesis method of hierarchical porous ZSM-5 molecular sieve anchored palladium nanoparticles

A technology of ZSM-5 and synthesis method, which is applied in the field of catalysis, can solve the problems of limiting the industrial application of palladium catalysts, easy aggregation of palladium particles, difficulty in uniform particle size of palladium particles, etc., and achieves high stability, simple preparation process, small size uniform effect

Inactive Publication Date: 2019-07-23
天津金玺科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Palladium catalyst prepared by traditional impregnation method, the particle size of palladium is difficult to achieve uniformity
After the roasting and reduction process in the catalytic reaction, palladium particles are easy to aggregate, which limits some industrial applications of palladium catalysts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Dissolve 2g of palladium acetate into 1ml of ethanol and 10ml of ethanol, and stir until the palladium acetate is completely dissolved to obtain solution A. Another weighed 0.032g NaOH was placed in a 100ml beaker, then added 45ml of distilled water to it, stirred for 3min; then added 4.32gTPAOH, stirred for 10min; then gradually added dropwise 10ml of TEOS, stirred for 30min, and continued to stir at room temperature for 8h. Then pour liquid A into liquid B, stir quickly and pour it into the lining of a 100ml hydrothermal kettle, and dry the obtained gel precursor in an oven at 60°C for 2 hours to obtain dry glue.

[0024] Molar ratio 10SiO 2 : 0.04Al 2 o 3 :1.0Na 2 O:1KF:300H 2 O The order of addition is to fully disperse the aluminum source and sodium hydroxide in water first, and then add the silica sol drop by drop after the dispersion is uniform, add (0.5wt%-20wt%) seed crystals after stirring at room temperature for 6 hours, and then install them after stirri...

Embodiment 2

[0028] Dissolve 1 g of palladium acetate into 1 ml of ethanol and 10 ml of ethanol, and stir until the palladium acetate is completely dissolved to obtain solution A. Another weighed 0.032g NaOH was placed in a 100ml beaker, then added 45ml of distilled water to it, stirred for 3min; then added 4.32gTPAOH, stirred for 10min; then gradually added dropwise 10ml of TEOS, stirred for 30min, and continued to stir at room temperature for 8h. Then pour liquid A into liquid B, stir rapidly and pour it into the lining of a 100ml hydrothermal kettle, and dry the obtained gel precursor in an oven at 120°C for 2 hours to obtain a dry gel.

[0029] Molar ratio 10SiO 2 : 0.04Al 2 o 3 :1.2Na 2 O:6KF:600H 2 O The order of addition is to fully disperse the aluminum source and sodium hydroxide in water first, and then add the silica sol drop by drop after the dispersion is uniform, add (0.5wt%-20wt%) seed crystals after stirring at room temperature for 6 hours, and then install them after s...

Embodiment 3

[0033] Dissolve 2g of palladium acetate into 1ml of ethanol and 10ml of ethanol, and stir until the palladium acetate is completely dissolved to obtain solution A. Another weighed 0.032g NaOH was placed in a 100ml beaker, then added 45ml of distilled water into it, stirred for 3min; then added 6.32gTPAOH, stirred for 10min; then gradually added 15ml of TEOS, stirred for 30min, and continued to stir for 8h at room temperature. Then pour liquid A into liquid B, stir rapidly and pour it into the lining of a 100ml hydrothermal kettle, and dry the obtained gel precursor in an oven at 180°C for 2 hours to obtain a dry gel.

[0034] Molar ratio 10SiO 2 : 0.04Al 2 o 3 :1.8Na 2 O:6KF:600H 2O The order of addition is to fully disperse the aluminum source and sodium hydroxide in water first, and then add the silica sol drop by drop after the dispersion is uniform, add (0.5wt%-20wt%) seed crystals after stirring at room temperature for 6 hours, and then install them after stirring at ...

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PUM

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Abstract

The invention discloses a synthesis method of hierarchical porous ZSM-5 molecular sieve anchored palladium nanoparticles, belongs to the technical field of catalysts, and solves the problems of poor noble metal utilization rate, easy high-temperature deactivation and agglomeration and the like in the existing supported catalyst technology. The hierarchical porous ZSM-5 molecular sieve anchored palladium nanoparticle catalyst is obtained by adopting a stepwise method to anchor and disperse palladium nano-particles in a ZSM-5 molecular sieve, along with the consumption of primary crystal seeds in the crystallization process, large-particle palladium nano-particles are excluded out of crystals, small-particle palladium nano-particles are anchored in the molecular sieve crystals, and high-temperature roasting treatment can realize uniform dispersion of the palladium particles. The preparation method of the catalyst provided by the invention is simple, the utilization rate of noble metal palladium is improved, the stability of palladium atoms is improved, and the service life of the catalyst is prolonged. The catalyst has both micropore channel confinement effect and hierarchical porousdiffusion capability, can improve the cracking capability of low-carbon alkanes at active sites, and can promote industrialization of reactions involving the low-carbon alkanes.

Description

technical field [0001] The invention belongs to the technical field of catalysis and relates to a method for synthesizing palladium nanoparticles anchored by multi-level porous ZSM-5 molecular sieves. Background technique [0002] As a typical solid acid material, ZSM-5 molecular sieve has a wide range of applications. It can be used in catalysts, catalyst supports, adsorbents and ion exchangers. It can also be used in aromatic hydrocarbon alkylation, catalytic cracking, light hydrocarbon aromatization, methanol In important industrial production such as gasoline. Moreover, when ZSM-5 molecular sieve is used as a catalyst additive for FCC, it can increase the octane number of gasoline and increase the production of low-carbon olefins; in addition, ZSM-5 molecular sieve can also be widely used in shape-selective catalysis, such as p-diethylbenzene catalyst, xylene isomerization catalyst. In addition, ZSM-5 molecular sieve pore size structure and acid strength, acid content ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/44
CPCB01J29/44B01J2229/18
Inventor 蔡建华
Owner 天津金玺科技发展有限公司
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