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催化学报 2010
纳米贵金属插入的粘土用于催化选择性加氢反应DOI: 10.1016/S1872-2067(10)60112-X, PP. 1200-1208 Keywords: selectivehydrogenation,nano-particle,platinum,ruthenium,intercalatedmontmorilloniteorhectorite,vaporphasereaction Abstract: ？Theuseofclaymineralsinthesynthesisofnanosizednoblemetalparticlestogiveincreasedcatalyticactivitywasinvestigated.Nanosizedplatinumandrutheniumcatalystsintercalatedinclay(montmorillonite/hectorite)weresynthesisedandtheircatalyticactivitywasevaluatedfortheselectivehydrogenationofthreedifferentα,β-unsaturatedaldehydes,namely,crotonaldehyde,cinnamaldehyde,andcitral,inagasphasemicroreactor.Themetalnano-solwaspreparedbythechemicalreductionofitsprecursorbythemicellartechniqueinthepresenceofcetyltrimethylammoniumbromide(CTAB),andthemicellestabilizedmetalparticleswereintercalatedintheclaymineralbyionexchange.TEMmicrographsofthecatalystparticlesshowedthatthemetalparticleswereinthenanometrerange.Theaveragediametersoftheparticleswere1–25nm.Theeffectsoftemperature,metalloading,andhydrogenflowrateonthecatalyticactivityandselectivityforα,β-unsaturatedalcoholwerestudied.Theresultswerecorrelatedwiththestructuralpropertiesofthecatalysts.Theproductsformedineachreactionoverthedifferentcatalystsshowedthatthecatalystswereveryactiveforhydrogenation,andtheselectivityforthedesiredproduct,namely,α,β-unsaturatedalcohol,wasgood.Themetalcatalystsintercalatedinmontmorilloniteshowedbetterselectivitythanthatinhectoritebecauseofitshigheracidity.Increasedselectivityforα,β-unsaturatedalcoholwasobservedwithincreasedflowrateofhydrogen.
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