Patent ID: 8161734

Claim:
An exhaust gas purification device comprising: an exhaust pipe defining an exhaust passage configured to discharge combustion gas from a combustion chamber of an internal combustion engine; a first SO x adsorption portion having a first SO x adsorption material, provided in the exhaust passage; a second SO x adsorption portion having a second SO x adsorption material, provided in the exhaust passage; and a NO x catalyst provided downstream of the first SO x adsorption portion and the second SO x adsorption portion in the exhaust passage, wherein the NO x catalyst is configured to absorb NO x in the combustion gas to purify the combustion gas, the first SO x adsorption material is configured to adsorb SO x in the combustion gas at a temperature lower than a first set temperature, the second SO x adsorption material is configured to store SO x in the combustion gas at a temperature equal to or higher than a second set temperature, and is capable of keeping the stored SO x at a temperature lower than the second set temperature, and a first heating portion configured to heat the first SO x adsorption material; and a first temperature control portion configured to control the first heating portion so as to cause the first SO x adsorption material to be heated when SO x overflows in the first SO x adsorption material.