Ag/TiO2-B2O3-Al2O3　adsorbents　with　different　B2O3　loadings　(e.　g.　5%~20%　(w))　were　prepared　by　impregnation.　Static　adsorption　tests　were　carried　out　by　contacting　the　adsorbents　with　commercial　diesel　containing　245.36　mg　(S)　/L　sulfur　at　ambient　conditions　to　investigate　the　adsorption　desulfurization　activity.　The　results　show　that　Ag/TiO2-Al2O3　modified　by　B2O3　exhibits　a　great　enhancement　for　the　adsorption　desulfurization　activity.　When　B2O3　(15%)　was　loaded,　2%Ag/4%TiO2-15%B2O3-Al2O3　(w)　could　achieve　the　best　desulfurization　activity　with　a　saturation　capacity　of　2.36　mg　(S)/g　adsorbent.　This　is　a　significant　achievement　regarding　the　desulfurization　efficiency,　especially　for　commercial　diesel　without　pretreatment.　The　effects　of　B2O3　on　the　textural　properties,　crystal　structure　and　surface　acidity　properties　of　the　adsorbent　were　studied　by　N2-physisorption,　O2-chemisorption,　X-ray　diffraction　(XRD),　temperature-programmed　desorption　of　ammonia　(NH3-TPD),　Fourier　transform　infrared　spectrometer　(FT-IR　spectra)　and　11B　nuclear　magnetic　resonance　(11B-NMR)　techniques.　Correlating　the　characterizations　with　the　desulfurization　activity,　it　is　found　that　the　adsorption　desulfurization　activity　is　well　related　with　the　amounts　of　weak　acid　sites　on　the　adsorbents.　B2O3　modification　induces　larger　amounts　of　BO4　species　and　improves　the　surface　weak　acidity,　resulting　in　a　higher　adsorption　desulfurization　activity.　©,　2015,　Ranliao　Huaxue　Xuebao/Journal　of　Fuel　Chemistry　and　Technology.　All　right　reserved.