Exhaust purification device

An exhaust purification device, comprising:

• a first catalyst arranged in an exhaust passage of an engine and containing a three-way catalyst;
• a second catalyst arranged on a downstream side of the first catalyst in the exhaust passage and containing an NH3 adsorbent;
• a third catalyst arranged on a downstream side of the second catalyst in the exhaust passage and containing an HC adsorbent;
• a fourth catalyst arranged on a downstream side of the third catalyst in the exhaust passage and containing an oxidation catalyst and an oxygen storage/release material;
• and
• a secondary air supply device configured to supply secondary air between the first catalyst and the second catalyst in the exhaust passage, wherein
• the NH3 adsorbent includes a zeolite having a pore structure of an oxygen ring of less than 10 members, and
• the HC adsorbent includes a zeolite having a pore structure of an oxygen ring of 10 members or more.