| 简介 |
PROBLEM TO BE SOLVED : To provide a methanation reaction catalyst which is used for reacting hydrogen with carbon dioxide, carbon monoxide and carbon dioxide or a gaseous mixture containing them as main components to obtain methane in high yield and to provide a method for manufacturing the methanation reaction catalyst. SOLUTION : A hydrosol of zirconia, salts of rare earth elements and salts of iron-group elements are mixed with one another and the obtained mixture is concentrated, dried, fired and reduced. When the sum total based on the metals of elemental states is defined as 100%, the chemical composition is characterized in that one or more rare earth elements M selected from among Sm, Ce, La and Y account for 2.4-18.79 atomic%, Zr accounts for 22.5-69 atomic%, Zn : M (atomic ratio) is 3 to 11.5, the iron-group elements bearing catalytic activity account for 25-70 atomic% and the atomic ratio of Ni to the iron-group elements is ≥60%. As a result, such a catalyst is obtained that iron-group elements of metal states are deposited on a compound oxide having a tetragonal zirconia structure in which rare earth elements and a part of iron-group elements are taken and stabilized. Sometimes a part of iron-group elements contained in the compound oxide having the tetragonal zirconia structure is lost by a reaction with carbon monoxide. Even in that case, the stability of a structure of a carrier is not damaged. COPYRIGHT : (C)2009, JPO&INPIT |
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