To　improve　the　removal　capacity　of　NO　+　O2　effectively,　the　alkaline　earth　metal-doped　order　mesoporous　carbon　(A-C-FDU-15(0.001)　(A　=　Mg,　Ca,　Sr　and　Ba))　and　Mg-C-FDU-15(x)　(x　=　0.001−0.003)　samples　were　prepared,　and　their　physicochemical　and　NO　+　O2　adsorption　properties　were　determined　by　means　of　various　techniques.　The　results　show　that　the　sequence　in　(NO　+　O2)　adsorption　performance　was　as　follows:　Mg-C-FDU-15(0.001)　(93.2　mg/g)　＞　Ca-C-FDU-15(0.001)　(82.2　mg/g)　＞　Sr-C-FDU-15(0.001)　(76.1　mg/g)　＞　Ba-C-FDU-15(0.001)　(72.9　mg/g)　＞　C-FDU-15　(67.1　mg/g).　Among　all　of　the　A-C-FDU-15(0.001)　samples,　Mg-C-FDU-15(0.001)　possessed　the　highest　(NO　+　O2)　adsorption　capacity　(106.2　mg/g).　The　species　of　alkaline　earth　metals　and　basic　sites　were　important　factors　determining　the　adsorption　of　NO　+　O2　on　the　A-C-FDU-15(x)　samples,　and　(NO　+　O2)　adsorption　on　the　samples　was　mainly　chemical　adsorption.　Combined　with　the　results　of　(NO　+　O2)-temperature-programmed　desorption　((NO　+　O2)-TPD)　and　in　situ　diffused　reflectance　infrared　Fourier　transform　spectroscopy　(DRIFTS)　characterization,　we　deduced　that　there　were　two　main　pathways　of　(NO　+　O2)　adsorption:　one　was　first　the　conversion　of　NO　and　O2　to　NO2　and　then　part　of　NO2　was　converted　to　NO2−　and　NO3−;　and　the　other　was　the　direct　oxidation　of　NO　to　NO2−　and　NO3−.　©　2020