CATALYST FOR ETHYLENE OXIDE PRODUCTION AND METHOD FOR PRODUCING ETHYLENE OXIDE

• US 20120022277A1
• Filed: 03/30/2010
• Published: 01/26/2012
• Est. Priority Date: 03/31/2009
• Status: Active Grant

• Current Assignee: Nippon Shokubai Company Limited
• Original Assignee: Nippon Shokubai Company Limited
• Inventors: Sento, Tadashi, Shima, Masahide, Hashimoto, Takaaki
• Granted Patent: US 9,090,577 B2
• Time in Patent Office: Days
• US Class Current: 549/534
• CPC Class Codes: B01J 23/002 Mixed oxides other than spinels, e.g. perovskite
• CPC Class Codes: B01J 23/6567 Rhenium
• CPC Class Codes: B01J 23/688 with manganese, technetium or rhenium
• CPC Class Codes: B01J 2523/00 Constitutive chemical elements of heterogeneous catalysts
• CPC Class Codes: B01J 2523/15 Caesium
• CPC Class Codes: B01J 2523/18 Silver
• CPC Class Codes: B01J 2523/68 Molybdenum
• CPC Class Codes: B01J 2523/69 Tungsten
• CPC Class Codes: B01J 2523/74 Rhenium
• CPC Class Codes: B01J 35/612 less than 10 m2/g
• CPC Class Codes: B01J 35/633 less than 0.5 ml/g
• CPC Class Codes: B01J 35/651 50-500 nm
• CPC Class Codes: B01J 37/0201 Impregnation
• CPC Class Codes: B01J 37/088 Decomposition of a metal salt
• CPC Class Codes: B01J 37/12 Oxidising
• CPC Class Codes: C07D 301/08 in the gaseous phase
• CPC Class Codes: C07D 301/10 with catalysts containing silver or gold
• CPC Class Codes: C07D 303/00 Compounds containing three-membered rings having one oxygen atom as the only ring hetero atom
• CPC Class Codes: Y02P 20/52 using catalysts, e.g. selective catalysts

Abstract

PROBLEM There is provided a catalyst for producing ethylene oxide which is superior in catalytic selectivity and catalytic life (durability).

SOLUTION There is provided a catalyst for producing ethylene oxide having a catalyst component supported on a carrier, wherein the carrier has specific surface area of 0.5 to 1.3 m²/g, Si content (SiO₂ equivalent) of 0.1 to 5.0% by mass and Na content (Na₂O equivalent) of 0.05 to 1.0% by mass, and the catalyst component is silver (Ag), cesium (Cs), rhenium (Re) and tungsten (W) or molybdenum (Mo).

Claims

1. A catalyst for producing ethylene oxide having a catalyst component supported on a carrier, wherein the carrier has specific surface area of 0.5 to 1.3 m²/g, Si content (SiO₂ equivalent) of 0.1 to 5.0% by mass and Na content (Na₂O equivalent) of 0.05 to 1.0% by mass, and the catalyst component is silver (Ag), cesium (Cs), rhenium (Re) and tungsten (W) or molybdenum (Mo).

2. The catalyst for producing ethylene oxide according to claim 1, wherein rhenium content (rhenium equivalent) is 200 to 1500 ppm per 1 m²/g of carrier specific surface area.

3. The catalyst for producing ethylene oxide according to claim 1, wherein weight ratio of rhenium (Re) to tungsten (W) or molybdenum (Mo) (ratio converted to rhenium/tungsten or molybdenum) is 0.4 or more and less than 5.0.

4. A method for producing ethylene oxide, wherein ethylene is subjected to gas phase oxidation by a molecular-oxygen-containing gas in the presence of the catalyst according to claim 1.

5. The catalyst for producing ethylene oxide according to claim 2, wherein weight ratio of rhenium (Re) to tungsten (W) or molybdenum (Mo) (ratio converted to rhenium/tungsten or molybdenum) is 0.4 or more and less than 5.0.

6. A method for producing ethylene oxide, wherein ethylene is subjected to gas phase oxidation by a molecular-oxygen-containing gas in the presence of the catalyst according to claim 2.

7. A method for producing ethylene oxide, wherein ethylene is subjected to gas phase oxidation by a molecular-oxygen-containing gas in the presence of the catalyst according to claim 3.

8. A method for producing ethylene oxide, wherein ethylene is subjected to gas phase oxidation by a molecular-oxygen-containing gas in the presence of the catalyst according to claim 5.