SnO2　is　widely　used　in　catalysis　owing　to　its　oxygen　vacancies,　reducible　oxygen　species,　and　acidity.　In　this　work,　Ru　nanoparticles　(NPs)　supported　on　three-dimensionally　ordered　macroporous　(3DOM)　SnO2　(xRu/3DOM　SnO2,　Ru　loading　(x)　=　0.09-1.65　wt%)　were　fabricated　via　the　polyvinyl　alcohol-protected　reduction　routes,　and　their　catalytic　activities　were　determined　for　trichloroethylene　(TCE)　and/or　toluene　oxidation.　It　was　shown　that　the　0.98Ru/3DOM　SnO2　sample　exhibited　the　best　activity　and　good　thermal　stability,　with　the　temperature　(T-90%)　and　apparent　activation　energy　at　a　TCE　(1000　ppmv)　conversion　of　90%　being　300　degrees　C　and　44　kJ/mol　at　space　velocity　=　40,000　mL/(g　h),　respectively.　Trichloromethane,　carbon　tetrachloride,　tetrachloroethylene,　and　trichloroacetaldehyde　hydrate　were　the　main　intermediates　in　TCE　oxidation.　The　high　catalytic　performance　of　0.98Ru/3DOM　SnO2　was　attributed　to　the　presence　of　hydroxyl　groups　adsorbed　at　the　oxygen　vacancies,　strong　O-2　adsorption　ability,　good　low-temperature　reducibility,　and　strong　interaction　between　Ru　NPs　and　3DOM　SnO2.　In　addition,　a　catalytic　mechanism　over　xRu/3DOM　SnO2　was　proposed　under　dry　and　humid　conditions.　The　introduction　of　H2O　could　block　some　of　the　reaction　pathways　from　inhibiting　the　production　of　C2Cl4,　reduce　formation　of　some　by-products　(e.g.,　CH2Cl2,　CH3COOH,　and　C2H2Cl2),　promote　removal　of　the　chlorine　species,　and　generate　a　greater　amount　of　HCl　and　a　smaller　amount　of　Cl-2.　Furthermore,　introducing　toluene　into　the　TCE　stream　could　generate　smaller　amounts　of　organic　chlorine　by-products　and　greater　amounts　of　inorganic　chlorine　products　(HCl　and　Cl-2).　We　are　sure　that　this　work　can　provide　a　guideline　for　the　industrial　application　of　supported　Ru　catalysts　in　the　removal　of　Cl-containing　volatile　organic　compounds.　(C)　2021　Elsevier　Inc.　All　rights　reserved.