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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 noble-metal-loaded grade-hole macropore-mesoporous gamma-Al2O3 catalyst. A preparation method of the catalyst comprises the steps of with an acetonitrile water solution as a reaction medium, constructing a catalyst carrier with a hole-hole crosslinking and cut-through duct system by regulating the content of water in an acetonitrile water system in a reaction process, and carrying out noble metal loading, so as to synthesize noble-metal-loaded macropore-mesoporous aluminum oxide catalyst with the grade holes. The preparation method is simple, feasible and applicable to batch production, synthesis conditions are mild, the reaction is easily controllable, and the cycle is short; the prepared catalyst has a grade-hole macropore-mesoporous structure, mesopores are formed by aluminum oxide nanorods through assembling, and loaded noble metal active components are uniformly distributed on carriers, so that the catalyst integrally has good duct connectivity, a high specific surface area and a large pore volume and has good application prospects in the fields of petrochemical engineering and catalysts and particularly the fields of deoxidation and hydrogenation of biomass diesel, utilization of biomass diesel byproducts and the like.

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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