Catalyst for production of epoxides and methods for production thereof and epoxides

Abstract

It provide a catalyst for the production of epoxides by a vapor-phase oxidation of an unsaturated hydrocarbon having a chain length of 4-20 carbon atoms and containing no allylic hydrogen atom, characterized by having a catalytic component containing silver and at least one element selected from the group consisting of alkali metals and thallium deposited onto a carrier obtained by mixing α-alumina having a sodium content in the range of 1-70 mmol (as reduced to Na) per kg of α-alumina with an aluminium compound, a silicon compound, and a sodium compound and calcining the resultant mixture, the carrier having a silicon content (as reduced to SiO 2 ) in the range of 0.3-11.5 mass % based on the mass of the carrier and a sodium content (as reduced to Na 2 O) in the range of 0.11-2.5 mass % based on the mass of the carrier.

1 ] A catalyst for the production of epoxides by a vapor-phase oxidation of an unsaturated hydrocarbon having a chain length of 4-20 carbon atoms and containing no allylic hydrogen atom, characterized by having a catalytic component containing silver and at least one element selected from the group consisting of alkali metals and thallium deposited onto a carrier obtained by mixing α-alumina having a sodium content in the range of 1-70 mmol (as reduced to Na) per kg of α-alumina with an aluminium compound, a silicon compound, and a sodium compound and calcining the resultant mixture, the carrier having a silicon content (as reduced to SiO 2 ) in the range of 0.3-11.5 mass % based on the mass of the carrier and a sodium content (as reduced to Na 2 O) in the range of 0.11-2.5 mass % based on the mass of the carrier.  
     
     
         2 ] A catalyst according to claim  1 , wherein a volume ratio of pores having diameters of not more than 0.5 μm is not more than 50%, and not more than 5 μm is more than 65%, based on the carrier.  
     
     
         3 ] A catalyst according to claim  1 , wherein said carrier has a specific surface area in the range of 0.1-5 m 2 /g based on the mass of the carrier, a water absorption ratio in the range of 20-50%, and an average pore diameter in the range of 0.3-3.5 μm.  
     
     
         4 ] A catalyst according to claim  1 , wherein the mass ratio of silicon to sodium compound in said catalyst (SiO 2 /Na 2 O) is in the range of 1-20.  
     
     
         5 ] A catalyst according to claim  1 , wherein said a silicon content of said carrier per unit surface area is in the range of 0.1-20 mass %/(m 2 /g) based on the mass of said carrier.  
     
     
         6 ] A catalyst according to claim  1 , which contains silver as a catalytic component in the range of 5-25% by mass and at least one element selected from the group consisting of alkali metals and thallium in the range of 0.001-5% by mass, based on the total mass of the catalyst.  
     
     
         7 ] A catalyst according to claim  1 , wherein a catalyst component containing silver and at least one element selected from the group containing of alkali metals and thallium is deposited on said carrier and thereafter the resultant composite is eventually heat-treated in an inert gas containing substantially no oxygen at an elevated temperature in the range of 400-700° C.  
     
     
         8 ] A method for the preparation of a catalyst for the production of an epoxide by the vapor-phase oxidation of an unsaturated hydrocarbon having a chain length of 4-20 carbon atoms and containing no allylic hydrogen atom, characterized by causing a solution containing silver and at least one element selected from the group consisting of alkali metals and thallium to impregnate a carrier obtained by adding an aluminum compound, a silicon compound, and a sodium compound to α-alumina having a sodium content (as reduced to Na) in the range of 1-70 mmols per kg of the α-alumina and calcining the resultant mixture and having a silicon content (as reduced to SiO 2 ) in the range of 0.3-11.5 mass % per mass of the carrier and a sodium content (as reduced to Na 2 O) in the range of 0.11-2.5 mass % per mass of the carrier.  
     
     
         9 ] A method according to claim  8 , wherein a high-temperature heat treatment is-performed in an inert gas containing substantially no oxygen at an elevated temperature in the range of 400-700° C. after a silver-carrying catalyst is obtained in consequence of said impregnation.  
     
     
         10 ] A method for the production of epoxides, which comprises effecting said production by a vapor-phase oxidation of an unsaturated hydrocarbon having a chain length of 4-20 carbon atoms and containing no allylic hydrogen atom with a molecular oxygen-containing gas in the presence of a catalyst set forth in any of Items (1)-(7).  
     
     
         11 ] A method for the production of 3,4-epoxy-1-butene, which comprising effecting said production by a vapor-phase oxidation of 1,3-butadiene with a molecular oxygen-containing gas in the presence of a catalyst set forth in any of Items (1)-(7).