The present invention relates to a Mn-added titanium dioxide carrier obtained by adding Mn salt to amorphous titanium dioxide and then calcining. The present invention also relates to a NOx adsorbent containing an adsorbing component composed of Ru and / or Ce oxide in the titanium dioxide carrier. The present invention also relates to a NOx adsorbent containing an adsorbing component composed of Ru and / or Ce oxide and at least one oxide of Ag, Cu and Mn in the titanium dioxide carrier. The NOx adsorbent according to the present invention is effectively used for efficiently adsorbing and removing NOx from a gas containing a large amount of water and a low concentration NOx of several ppm, such as a road tunnel vent gas.
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