Gas decomposition catalyst and method and scrubber system for decomposing nitrous oxide (n2o) gas by using the same

A method of decomposing nitrous oxide gas, the method comprising contacting a gas stream including nitrous oxide gas with a gas decomposition catalyst,

• wherein the gas decomposition catalyst comprises:
• a perovskite-based oxide host material represented by Formula 1, in which a B′ element and a B″ element that are different from each other are each doped into a B site;
• and
• one or more B′ element protrusion particles derived from a portion or all of the B′ element on a surface of the perovskite-based oxide host material,
• wherein the one or more B′ element protrusion particles have a shape in which a portion of one particle is fixed inside the perovskite-based oxide host material and another portion of the one particle protrudes from the surface of the perovskite-based oxide host material:
• wherein, in Formula 1,
• A is at least one element of strontium or lanthanum,
• B is at least one of metals having an oxidation number of +3, +4, or +5,
• B′ is at least one of elements of which Gibbs free energy
• (
• Δ
• ⁢
• G
• red
• 9
• ⁢
• 0
• ⁢
• 0
• ⁢
• C
• )
• of a reduction reaction at a temperature of 900° C. according to Reaction Formula 1 is 0 or less,
• B″ is at least one element of zirconium, hafnium, niobium, tantalum, gadolinium, scandium, or titanium,
• x, y, and z are each a rational number that is greater than 0 and less than 1, and
• x+y+z=1:
• wherein, in Reaction Formula 1,
• x1 and y1 are each a positive rational number,
• red is reduction, and
• M is a metal.

A scrubber system for decomposing nitrous oxide gas, the scrubber system comprising:

• a gas inlet through which a process gas flows in;
• a scrubber comprising a gas decomposition catalyst which decomposes nitrous oxide gas from the process gas flowing in from the gas inlet;
• and
• a gas outlet through which a gas, from which the nitrous oxide gas is removed, flows out from the scrubber,
• wherein the gas decomposition catalyst comprises:
• a perovskite-based oxide host material represented by Formula 1, in which a B′ element and a B″ element that are different from each other are each doped into a B site;
• and
• one or more B′ element protrusion particles derived from a portion or all of the B′ element on a surface of the perovskite-based oxide host material,
• wherein the one or more B′ element protrusion particles have a shape in which a portion of one particle is fixed inside the perovskite-based oxide host material and another portion of the one particle protrudes from the surface of the perovskite-based oxide host material:
• wherein, in Formula 1,
• A is at least one element of strontium or lanthanum,
• B is at least one of metals having an oxidation number of +3, +4, or +5,
• B′ is at least one of elements of which Gibbs free energy
• (
• Δ
• ⁢
• G
• red
• 9
• ⁢
• 0
• ⁢
• 0
• ⁢
• C
• )
• of a reduction reaction at a temperature of 900° C. according to Reaction Formula 1 is 0 or less,
• B″ is at least one element of zirconium, hafnium, niobium, tantalum, gadolinium), scandium, or titanium,
• x, y, and z are each a rational number that is greater than 0 and less than 1, and
• x+y+z=1:
• wherein, in Reaction Formula 1,
• x1 and y1 are each a positive rational number, and
• M is a metal.