Method of purifying exhaust gas from internal combustion engine

A method of purifying exhaust gas from an internal combustion engine, comprising the steps of:

• loading a sulfur solidifier including a basic metal element for solidifying a sulfur component, into exhaust gas after combustion in a cylinder of the internal combustion engine, to solidify the sulfur component being the cause of SOx poisoning of the exhaust purifying catalyst;
• and
• flowing the exhaust gas after solidification of the sulfur component into an NOx-occluding reduction-type exhaust purifying catalyst, wherein SOx poisoning of the NOx occluding reduction-type exhaust purifying catalyst is suppressed, and wherein an oxidation catalyst is placed upstream of said exhaust purifying catalyst on an exhaust path and wherein said sulfur solidifier is loaded into the exhaust gas between said oxidation catalyst and said exhaust purifying catalyst.