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 byusing 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 conditionsare 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...

AI Technical Summary

Problems solved by technology

Its formation structure is relatively stable, and its comprehensive performance is good, but its disadvantage is that the noble metal and the oxide are not only used as materials for the catalytic reaction, but also distributed inside the carrier. The content is low, and the distribution state and size of precious metals on the surface will be affected by harmful gases. After a long time of catalysis, the precious metal particles on the surface will agglomerate and grow, and the catalytic performance will decline rapidly.

Images