SULFUR OXIDE ABSORBER AND EXHAUST GAS CLEANING APPARATUS

摘要

PROBLEM TO BE SOLVED: To increase the absorption amount of SOx and increase the retaining capacity of SOx in a rich atmosphere at a lower temperature region and suppress emission.

SOLUTION: An exhaust gas cleaning apparatus comprises a carrier which is comprised of a main oxide having a spinnel structure and a sub oxide comprising at least either iron oxide or nickel oxide and a noble metal carried on the carrier. The main oxide has a high specific surface area and a strong base point so that the main iron oxide has many base points and absorbs a large amount of SOx in a lean atmosphere. The sub iron oxide reacts with H2S and becomes to a metal sulfide in a temperature region lower than 600 °C. Thus, the discharge of H2S is suppressed in the rich atmosphere and the absorption amount of SOx is further increased.

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