Multimetallic oxides for thermally reversible nox sorption

A NOx sorbent material comprising:

• a multi-metallic oxide that includes one or more alkali or alkaline earth metal;
• one or more 3d transition metal;
• one or more rare earth element;
• wherein a composition of the multi-metallic oxide, 3d transition metal, and one or more rare earth elements is configured to adsorb and absorb NOx below a set point temperature and to release the adsorbed or absorbed NOx at a second temperature at or above the set point temperature.

A method of NOx sorption comprising:

• applying an NOx sorbent material to exhaust gas, wherein the NOx sorbent material comprises:
• a manganese catalyst;
• and,
• a support material;
• wherein a composition of the manganese catalyst is configured to adsorb and absorb NOx below a set point temperature and to release the adsorbed and absorbed NOx at second temperature at or above the set point temperature.