The　Ba-CMK-3(x)　(x　was　the　Ba(NO3)2:CMK-3　mass　ratio　and　equals　to　5,　10,　and　15　wt%)　samples　were　prepared　by　the　incipient　impregnation　method,　which　were　used　for　the　adsorption　of　NO　+　O2　at　room　temperature.　The　samples　were　characterized　by　the　XRD,　BET,　TEM,　TPD,　TG,　and　DRIFTS　techniques.　The　results　showed　that　the　CMK-3　and　Ba-CMK-3(x)　samples　possessed　an　ordered　two-dimensional　hexagonal　mesoporous　structure,　and　Ba　was　uniformly　dispersed　on　the　surface　of　CMK-3.　After　Ba　doping,　the　surface　areas　and　pore　size　distributions　of　the　Ba-CMK-3(x)　samples　were　altered　due　to　the　synergistic　effect　of　partial　blocking　of　the　channels　by　Ba　and　partial　etching　of　the　carbon　materials　by　O2　produced　from　Ba(NO2)3　decomposition　at　high　temperatures.　The　sequence　in　NO　adsorption　capacity　was　Ba-CMK-3(10)　(108.1　±　0.55　mg/g)　＞　Ba-CMK-3(15)　(106.2　±　0.72　mg/g)　＞　Ba-CMK-3(5)　(102.3　±　1.33　mg/g)　＞　CMK-3(88.8　±　1.15　mg/g),　with　the　Ba-CMK-3(10)　sample　showing　the　best　(NO　+　O2)　adsorption　performance.　We　proposed　the　two　main　adsorption　pathways　in　the　process　of　NO　adsorption:　(i)　NO　reacted　with　O2　to　form　NO2,　part　of　NO2　were　weakly　adsorbed　on　the　surface　hydroxyl　groups,　part　of　NO2　were　adsorbed　to　form　the　nitrite　and　nitrate　species,　and　the　left　NO2　was　disproportionated　to　the　NO,　NO2-,　and　NO3-　species;　and　(ii)　NO　was　directly　oxidized　to　the　NO2-　species　by　the　oxygen-containing　functional　groups　in　carbon,　and　then　some　of　the　NO2-　species　were　transformed　to　the　NO3-　species　directly　or　via　disproportionation.　The　regeneration　efficiencies　of　the　Ba-CMK-3(x)　samples　were　slightly　inferior　to　that　of　the　CMK-3　sample.