Method for preparing catalyst of alpha/gamma-Al2O3-loaded nano-precious metal particles

Abstract

The invention provides a brand new method for preparing a catalyst of alpha / gamma-Al2O3-loaded nano-precious metal particles, which is characterized in that precious metal powder (two or more of Ag, Au, Pt, Ru, Ph, Pd, Ir and Re), aluminite powder or alloy powder of the precious metal and aluminum are taken as raw materials; a small amount of other elements which are taken as performance adjustment elements (the mass percent ratio of the precious metal to the aluminum is controlled to be 2-8%) is added; mechanical alloying in a low-temperature ball mill is carried out; argon is used to protect the atmosphere of the ball milling; the prepared precious metal is packed by the aluminite powder to reach even distribution of nanocluster in the powder; the composite powder slurry is processed by using a special process; the slurry is coated on a polyporous alpha / gamma-Al2O3-ceramic catalyst carrier; oxygen-containing sintering is performed within a certain temperature; the process conditions are controlled to finish reaction systemization of oxides while the precious metal particles are not oxidized; and the prepared precious metal is distributed on the surface of the novel catalyst material in the form of the nano particles. Because the surrounding of the catalyst is packed by the aluminum oxide, the catalyst is provided with good catalytic performance and can prevent the catalytic performance from reduction due to the increment of the precious metal nano particles in the user process; the catalyst has the advantages of high combination property and low cost; and the process is easy to control.

Description

technical field

[0001] The invention relates to the field of composite material science, in particular to the preparation of α / γ-Al by reaction synthesis technology 2 o 3 Catalyst slurry loaded with nanometer noble metal particles. Background technique

[0002] As the foundation of modern materials industry, catalytic technology is increasingly widely and deeply infiltrated in petroleum refining, chemistry, polymer materials, medicine and other industries, as well as environmental protection industries, and plays a pivotal role. For a long time, the traditional catalysts used in industry often have disadvantages such as low activity and poor selectivity. At the same time, they often require harsh reaction conditions such as high temperature and high pressure, and they consume a lot of energy and have low efficiency. Many of them also pollute the environment.

[0003] Noble metal catalyst materials have unique catalytic activity, selectivity and stability, making them attra...

Examples

Embodiment 1

[0041] Embodiment 1 According to 3% platinum powder (percentage by weight), 2% rhodium powder (percentage by weight), add an appropriate amount of cerium-aluminum alloy powder, and the balance is aluminum powder. After mixing for 1 hour, put it into the ball mill of corundum material Vacuum the tank, fill it with argon, and carry out mechanical alloying under the protective atmosphere of argon. The planetary high-energy ball mill rotates at 800 rad / min, the ball milling time is 15 hours, and the ball milling temperature is 180K; take out the obtained material to make a slurry, and coat it on the porous α / γ-Al 2 o 3 The ceramic catalyst carrier is put into a reaction synthesis furnace for sintering, the reaction synthesis temperature is 1100K, the reaction synthesis oxygen atmosphere concentration is relatively high, and the reaction synthesis time is 2 hours. The sample is taken out to obtain a porous alumina ceramic catalytic material with a size of about 2-30 nanometers of ...

Embodiment 2

[0042] Embodiment 2 is by 3% platinum powder (percentage by weight), 1% rhodium powder (percentage by weight), 2% palladium powder (percentage by weight), adds an appropriate amount of cerium aluminum alloy powder, and the balance is aluminum powder, through 1 After mixing for hours, put it into a ball mill jar made of corundum material, vacuumize it, fill it with argon, and perform mechanical alloying under an argon protective atmosphere. The rotation speed of the planetary high-energy ball mill is 1000rad / min, the ball milling time is 35 hours, and the ball milling temperature is 200K; take out the obtained material to make a slurry, and coat it on the porous α / γ-Al 2 o 3 The ceramic catalyst carrier is put into a reaction synthesis furnace for sintering, the reaction synthesis temperature is 1200K, the reaction synthesis oxygen atmosphere concentration is relatively high, and the reaction synthesis time is 3 hours. The sample is taken out to obtain a porous alumina ceramic...

Embodiment 3

[0043] Embodiment 3 press 2% platinum powder (percentage by weight), 1% rhodium powder (percentage by weight), 2% palladium powder (percentage by weight), 3% silver powder (percentage by weight), add an appropriate amount of tin-aluminum quasi-alloy powder, and the balance is aluminum powder. After mixing for 1 hour, put it into a ball mill jar made of corundum material, vacuumize it, fill it with argon gas, and carry out mechanical alloying under an argon gas protective atmosphere. The planetary high-energy ball mill rotates at 1200rad / min, the ball milling time is 50 hours, and the ball milling temperature is 220K; take out the obtained material to make a slurry, and coat it on the porous α / γ-Al 2 o 3 The ceramic catalyst carrier is put into a reaction synthesis furnace for sintering, the reaction synthesis temperature is 1300K, the reaction synthesis oxygen atmosphere concentration is relatively high, and the reaction synthesis time is 2 hours. The sample is taken out to o...

technical field

[0001] The invention relates to the field of composite material science, in particular to the preparation of α / γ-Al by reaction synthesis technology 2 o 3 Catalyst slurry loaded with nanometer noble metal particles. Background technique

[0002] As the foundation of modern materials industry, catalytic technology is increasingly widely and deeply infiltrated in petroleum refining, chemistry, polymer materials, medicine and other industries, as well as environmental protection industries, and plays a pivotal role. For a long time, the traditional catalysts used in industry often have disadvantages such as low activity and poor selectivity. At the same time, they often require harsh reaction conditions such as high temperature and high pressure, and they consume a lot of energy and have low efficiency. Many of them also pollute the environment.

[0003] Noble metal catalyst materials have unique catalytic activity, selectivity and stability, making them attra...

Examples

Embodiment 1

[0041] Embodiment 1 According to 3% platinum powder (percentage by weight), 2% rhodium powder (percentage by weight), add an appropriate amount of cerium-aluminum alloy powder, and the balance is aluminum powder. After mixing for 1 hour, put it into the ball mill of corundum material Vacuum the tank, fill it with argon, and carry out mechanical alloying under the protective atmosphere of argon. The planetary high-energy ball mill rotates at 800 rad / min, the ball milling time is 15 hours, and the ball milling temperature is 180K; take out the obtained material to make a slurry, and coat it on the porous α / γ-Al 2 o 3 The ceramic catalyst carrier is put into a reaction synthesis furnace for sintering, the reaction synthesis temperature is 1100K, the reaction synthesis oxygen atmosphere concentration is relatively high, and the reaction synthesis time is 2 hours. The sample is taken out to obtain a porous alumina ceramic catalytic material with a size of about 2-30 nanometers of ...

Embodiment 2

[0042] Embodiment 2 is by 3% platinum powder (percentage by weight), 1% rhodium powder (percentage by weight), 2% palladium powder (percentage by weight), adds an appropriate amount of cerium aluminum alloy powder, and the balance is aluminum powder, through 1 After mixing for hours, put it into a ball mill jar made of corundum material, vacuumize it, fill it with argon, and perform mechanical alloying under an argon protective atmosphere. The rotation speed of the planetary high-energy ball mill is 1000rad / min, the ball milling time is 35 hours, and the ball milling temperature is 200K; take out the obtained material to make a slurry, and coat it on the porous α / γ-Al 2 o 3 The ceramic catalyst carrier is put into a reaction synthesis furnace for sintering, the reaction synthesis temperature is 1200K, the reaction synthesis oxygen atmosphere concentration is relatively high, and the reaction synthesis time is 3 hours. The sample is taken out to obtain a porous alumina ceramic...

Embodiment 3

[0043] Embodiment 3 press 2% platinum powder (percentage by weight), 1% rhodium powder (percentage by weight), 2% palladium powder (percentage by weight), 3% silver powder (percentage by weight), add an appropriate amount of tin-aluminum quasi-alloy powder, and the balance is aluminum powder. After mixing for 1 hour, put it into a ball mill jar made of corundum material, vacuumize it, fill it with argon gas, and carry out mechanical alloying under an argon gas protective atmosphere. The planetary high-energy ball mill rotates at 1200rad / min, the ball milling time is 50 hours, and the ball milling temperature is 220K; take out the obtained material to make a slurry, and coat it on the porous α / γ-Al 2 o 3 The ceramic catalyst carrier is put into a reaction synthesis furnace for sintering, the reaction synthesis temperature is 1300K, the reaction synthesis oxygen atmosphere concentration is relatively high, and the reaction synthesis time is 2 hours. The sample is taken out to o...

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