Metal loaded catalyst and preparation method thereof

Abstract

A metal loaded catalyst comprises a support and main active metal components and optional auxiliary active metal components, wherein the main active metal components are elementary substances and obtained by ionizing radiation reducing precursors of main active metal components. The catalyst can be widely used in the catalytic reactions of petrochemistry industry with high activity and selectivity. The catalyst can be used directly without being reduced preliminarily by hydrogen.

1 - 15 . (canceled) 
     
     
         16 . A supported metal catalyst, comprising a carrier and supported thereon a primary metal active component and an optional secondary metal active component, and prepared by a method comprising
 applying ionizing radiation on a system comprising the primary metal active component precursor, the carrier, a free radical scavenger and water, to reduce at least the primary metal active component precursor into the primary metal active component in elementary state,   wherein the step of applying the ionizing radiation to carry out the reduction is conducted in any of the following manners:   a) wetting the carrier having the primary metal active component precursor supported thereon with an aqueous solution comprising the free radical scavenger, and then irradiating the wetted carrier, preferably in vacuum or under inert atmosphere; and   b) mixing the carrier having the primary metal active component precursor supported thereon with an aqueous solution comprising the free radical scavenger, and then irradiating the carrier immersed in the solution.   
     
     
         17 . The catalyst of  claim 16 , comprising:
 the carrier; and   supported thereon the following components:   a) the primary metal active component, which is one of the elements of Group VIII and Group IB, in an amount ranging from 0.01 wt % to 20 wt %, based on the total weight of the carrier; and   b) the optional secondary metal active component, which is at least one metal chosen from Group VIII elements, Group IB elements, Bi, Sb, In, Cs and Rb, in an amount ranging from 0 wt % to 20 wt %, based on the total weight of the carrier;   if present, the component b) being different from the component a).   
     
     
         18 . The catalyst of  claim 17 , wherein the primary metal active component a) is present in an amount ranging from 0.01 wt % to 10 wt %, based on the total weight of the carrier; and the secondary metal active component b) is present in an amount ranging from 0 wt % to 10 wt %, based on the total weight of the carrier. 
     
     
         19 . The catalyst of  claim 17 , wherein the optional secondary metal active component b) is present in the catalyst as an elementary metal or as a metal oxide. 
     
     
         20 . The catalyst of  claim 16 , wherein the carrier is chosen from Al 2 O 3 , SiO 2 , TiO 2 , MgO, diatomite, molecular sieves, clays and mixtures thereof. 
     
     
         21 . The catalyst of  claim 20 , wherein the carrier is of pellet shape, spherical shape, tablet shape, tooth-spherical shape, strip shape, or trilobal shape. 
     
     
         22 . The catalyst of  claim 16 , wherein the catalyst has an appearance exhibiting light grey, grey, black, bluish light grey, bluish grey, or bluish black. 
     
     
         23 . A method for the preparation of the catalyst of  claim 16 , comprising applying ionizing radiation on a system comprising the primary metal active component precursor, the carrier, a free radical scavenger and water, to reduce at least the primary metal active component precursor into the primary metal active component in elementary state, wherein the step of applying the ionizing radiation to carry out the reduction is conducted in any of the following manners:
 a) wetting the carrier having the primary metal active component precursor supported thereon with an aqueous solution comprising the free radical scavenger, and then irradiating the wetted carrier, preferably in vacuum or under inert atmosphere; and   b) mixing the carrier having the primary metal active component precursor supported thereon with an aqueous solution comprising the free radical scavenger, and then irradiating the carrier immersed in the solution.   
     
     
         24 . The method of  claim 23 , wherein the ionizing radiation used is γ-ray, X-ray or electron beam. 
     
     
         25 . The method of  claim 23 , wherein the ionizing radiation used has an adsorption dose rate of from 1 to 1×10 7  Gy/min, and wherein the ionizing radiation used has an adsorption dose of from 0.01 to 1×10 5  kGy. 
     
     
         26 . The method of  claim 23 , wherein the primary metal active component precursor is a corresponding compound of the primary metal active component, which is chosen from chlorides, nitrates, acetates, sulfates and organic metallic compounds. 
     
     
         27 . The method of  claim 23 , wherein prior to the radiation reduction, the carrier having the primary metal active component precursor supported thereon is treated with a fixing agent, which is a basic compound, preferably an aqueous solution of sodium hydroxide, potassium hydroxide, sodium bicarbonate or sodium carbonate, or ammonia water. 
     
     
         28 . The method of  claim 23 , wherein the free radical scavenger is at least one chosen from alcohols and formic acid, and preferably at least one chosen from methanol, ethanol, ethylene glycol, isopropyl alcohol and formic acid. 
     
     
         29 . The method of  claim 23 , further comprising supporting a secondary metal active component or a precursor thereof on the carrier, before, during, or after the ionizing radiation reduction. 
     
     
         30 . A method for converting an organic compound, comprising contacting a feedstock to be converted with the catalyst of  claim 16  under conversion conditions.