Olefin production device and olefin production method
An olefin production device for producing an olefin from a raw material gas containing methane and oxygen includes a reactor containing: a first catalyst; and a second catalyst disposed downstream of the first catalyst in a flow direction of the raw material gas. The first catalyst is a catalyst in which a zirconium salt or carbonate of an alkali metal, an oxide of an alkaline earth metal, an oxide of one kind of lanthanoid element, a composite oxide containing a lanthanoid element, or a combination thereof is supported on a support. The second catalyst is a catalyst containing a tungsten oxide, phosphate, or carbonate of an alkali metal.
1 . An olefin production device for producing an olefin from a raw material gas containing methane and oxygen,
the olefin production device comprising a reactor containing:
a first catalyst; and
a second catalyst disposed downstream of the first catalyst in a flow direction of the raw material gas,
wherein the first catalyst is a catalyst in which a zirconium salt or carbonate of an alkali metal, an oxide of an alkaline earth metal, an oxide of one kind of lanthanoid element, a composite oxide containing a lanthanoid element, or a combination thereof is supported on a support,
wherein
the second catalyst is a catalyst containing a tungsten oxide, phosphate, or carbonate of an alkali metal,
the reactor includes a first reactor and a second reactor,
the first reactor contains a part of the first catalyst and does not contain the second catalyst,
the second reactor contains the second catalyst and the remainder of the first catalyst which is provided upstream of the second catalyst in the flow direction of the raw material gas, and
at least one of an oxygen supply line for supplying oxygen into the second reactor upstream of the first catalyst contained in the second reactor in the flow direction of the raw material gas and an oxygen supply line for supplying oxygen into the second reactor between the first catalyst contained in the second reactor and the second catalyst is connected to the second reactor.
2 . The olefin production device according to claim 1 , wherein a temperature in the first reactor is 700° C. or lower, and a temperature in the second reactor is 700 to 900° C.
3 . The olefin production device according to claim 1 ,
wherein the first catalyst and the second catalyst are contained in one reactor, and
wherein an oxygen supply line for supplying oxygen into the reactor between the first catalyst and the second catalyst is connected to the reactor.
4 . The olefin production device according to claim 1 ,
wherein the first catalyst is a La 2 O 3 —CeO 2 composite catalyst, and the second catalyst is a catalyst in which Na 2 WO 4 is supported on a SiO 2 support.
5 . The olefin production device according to claim 1 ,
wherein the second catalyst is a catalyst containing a tungsten oxide, phosphate, or carbonate of an alkali metal doped with at least one of Mn or Sn.