Method for purification of exhaust gas from a diesel engine

A method for purification of exhaust gas from a diesel engine in a system, the method comprising the steps of:

• providing:
• a catalyst for selective catalytic reduction;
• a diesel particulate filter at least partially covered by a catalytic layer installed downstream
• of the catalyst for selective catalytic reduction;
• and
• a first catalyst for catalytic oxidation installed upstream of the catalyst for selective catalytic
• reduction and/or a second catalyst for catalytic oxidation installed between the catalyst for
• selective catalytic reduction and the diesel particulate filter;
• injecting a controlled amount of reductant at an inlet of the catalyst for selective catalytic reduction;
• and
• injecting a controlled amount of hydrocarbon at an inlet of the catalyst for catalytic oxidation;
• wherein the diesel particulate filter is passively regenerated by closing the injection of the reductant;
• wherein the diesel particulate filter is actively regenerated by opening the injection of the hydrocarbon at inlet of at least one of the first and second catalysts for catalytic oxidation.