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A hierarchical macroporous-mesoporous γ-al loaded noble metal 2 o 3 Catalyst and its preparation method

A graded pore, precious metal technology, applied in the field of graded pore macroporous-mesoporous γ-Al2O3 catalyst and its preparation, can solve the problems of poor pore structure, uneven loading of active components, complicated preparation process, etc., and achieve excellent pores. Structural and pore properties, the effect of improving flow diffusivity, and increasing specific surface area

Inactive Publication Date: 2019-09-10
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing noble metal-supported catalysts have a series of problems such as complex preparation process, poor pore structure, and uneven loading of active components.

Method used

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  • A hierarchical macroporous-mesoporous γ-al loaded noble metal <sub>2</sub> o <sub>3</sub> Catalyst and its preparation method
  • A hierarchical macroporous-mesoporous γ-al loaded noble metal <sub>2</sub> o <sub>3</sub> Catalyst and its preparation method
  • A hierarchical macroporous-mesoporous γ-al loaded noble metal <sub>2</sub> o <sub>3</sub> Catalyst and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A hierarchical macroporous-mesoporous γ-Al loaded with noble metals 2 o 3 Catalyst, its preparation method comprises the steps:

[0047] 1) Add 3mL of deionized water to the acetonitrile solution (20ml, 99.5wt%, relative density ρ=0.79), stir evenly to obtain an aqueous solution of acetonitrile, and then uniformly drop 2g of aluminum sec-butoxide solution (97wt%, relative density ρ=0.967), found to generate white precipitate immediately, under the condition of 25 ℃, after standing for 10min, use magnetic stirrer to stir 10min under the rotating speed of 100r / min, then stand for 10min, get white precipitate I;

[0048] 2) The white precipitate I obtained in step 1) is subjected to suction filtration, and the product obtained by suction filtration is placed in an oven at 60° C., left to stand for 12 hours and fully dried to obtain a white powder, which is used as a loaded precursor (macroporous-mesoporous AlOOH Precursor);

[0049] 3) Under the condition of 25℃, 1g H ...

Embodiment 2

[0053] A hierarchical macroporous-mesoporous γ-Al loaded with noble metals 2 o 3 Catalyst, its preparation method comprises the steps:

[0054] 1) Add 3mL of deionized water to the acetonitrile solution (20ml, 99.5wt%, relative density ρ=0.79), stir evenly to obtain an aqueous solution of acetonitrile, and then uniformly drop 2g of aluminum sec-butoxide solution (97wt%, relative density ρ=0.967), found to generate white precipitate immediately, under the condition of 25 ℃, after standing for 10min, use magnetic stirrer to stir 10min under the rotating speed of 100r / min, then stand for 10min, get white precipitate I;

[0055] 2) The obtained white precipitate I obtained in step 1) is subjected to suction filtration, and the product obtained by suction filtration is placed in a 60° C. Porous AlOOH precursor);

[0056] 3) Add 1g H 2 PtCl 6 ·6H 2 O powder dissolved in 250ml H 2 O, after stirring evenly, drop into 1mL hydrochloric acid solution (concentration is 0.05mol / L) t...

Embodiment 3

[0060] A hierarchical macroporous-mesoporous γ-Al loaded with noble metals 2 o 3 Catalyst, its preparation method comprises the steps:

[0061] 1) Add 4mL of deionized water to the acetonitrile solution (20ml, 99.5wt%, relative density ρ=0.79), stir evenly to obtain an aqueous acetonitrile solution, and then uniformly drop 2g of aluminum sec-butoxide solution (97wt%, relative density ρ=0.967), found to generate white precipitate immediately, under the condition of 25 ℃, after standing for 10min, use magnetic stirrer to stir 10min under the rotating speed of 100r / min, then stand for 10min, get white precipitate I;

[0062] 2) Suction filter the white precipitate I product obtained in step 1), put the product obtained by suction filtration into an oven at 60°C, and let it stand for 12 hours to fully dry to obtain a white powder, which is used as a loading precursor (macropore-mesopore AlOOH precursor);

[0063] 3) Add 1g H 2 PtCl 6 ·6H 2 O powder dissolved in 250ml H 2 O,...

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Abstract

The invention discloses a graded pore macroporous-mesoporous γ-Al carrying precious metals. 2 O 3 Catalyst, the present invention uses acetonitrile aqueous solution as the reaction medium. By adjusting the water content in the acetonitrile aqueous system during the reaction process, a catalyst carrier with a cross-penetrating pore system is constructed, and then precious metals are loaded to synthesize macropores with hierarchical pores. -Mesoporous precious metal supported alumina catalyst. The preparation method involved in the present invention is simple and feasible, the synthesis conditions are mild, the reaction is easy to control, the cycle is short, and it is suitable for mass production; the prepared catalyst has a hierarchical macropore-mesoporous structure, and the mesopores are assembled from alumina nanorods. The loaded precious metal active components are evenly distributed on the carrier, and the catalyst as a whole has good pore connectivity, high specific surface area and large pore volume. In the field of petrochemical industry and catalyst field, especially in biomass diesel deoxygenation and hydrogenation, biomass The utilization of diesel by-products and other fields have good application prospects.

Description

technical field [0001] The invention belongs to the technical field of inorganic synthesis, and in particular relates to a hierarchically porous macroporous-mesoporous γ-Al loaded with precious metals 2 o 3 Catalyst and method for its preparation. Background technique [0002] In modern petrochemical industry, new energy development, and comprehensive utilization of resources, supported catalysts occupy an irreplaceable important position. γ-Al, known as "activated alumina", 2 o 3 Because of its advantages such as adjustable pore structure, large specific surface area, good adsorption performance, low price, acidic surface and good thermal stability, it has become a catalyst or catalyst carrier widely used in the chemical and petrochemical industries. It is widely used in ammonia cracking, ammonia refining, hydroreforming and other fields. Due to their stable chemical properties, difficult to be oxidized, and their excellent physical properties and unique catalytic activ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/42B01J35/10
CPCB01J23/42B01J35/615B01J35/651B01J35/635B01J35/647
Inventor 苏宝连汪建南彭钊孙明慧陈丽华
Owner WUHAN UNIV OF TECH
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