High Selectivities to Ethylene by Partial Oxidation of Ethane

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1、REPORTShomogeneousreactions.WealsonotethattheprocesscanproducemoreHthanisfedbytheHighSelectivitiestoEthylene2successivedehydrogenationofCHsothat26byPartialOxidationofEthanewithrecycletheprocesscouldrequirenonetimportofH.2Thisprocessappearstooccurbymecha-A.S.Bodke,1D.A.Olschki,1L.D.Schmidt,1*E

2、.Ranzi2nismsverydifferentfromconventionalho-mogeneousandsurfaceprocessesbecauseAtleast85percentselectivitytoethyleneatgreaterthan70percentconversionbothhomogeneousandPt-catalyzedoxida-canbeobtainedbypartialoxidationofethanebyaddinglargeamountsofHtionprocessesyieldconsiderabledeepoxida-2tother

3、eactionmixtureandusingaplatinum-tincatalystoperatingat950¡CtiontoCOandCO.Theseresultssuggest2withacontacttimeof;1023seconds.ThissystemalmosttotallyshutsoffthenewtechnologiesforchemicalsynthesisbyreactionsthatformundesiredCOandCO,whichfallfrom20percentwithoutsuitabledesignofcatalystsandbyopera

4、ting2Hto5percentwhenHisadded.Althougha2/1H/Omixtureshouldbeunderextremeconditions.2222explosiveathightemperatures,noßamesorexplosionsoccurinthepresenceCatalystsintheseexperimentsconsistofofethane.ThesuccessivereactionsonthecatalystgeneratemoreHthanuseda-aluminafoammonoliths,18mmindiam-2inthef

5、eed,sowithrecyclenoadditionalHwouldbeneeded.Theseresultsareeterand10mmlong,onwhich1to5%by2unexpectedbecauseethyleneisanonequilibriumproductandentropycon-weightofPtandSnweredepositedfromsiderationsarguethatallreactionchannelsopenathightemperaturessotheaqueoussaltsolutions.Becausethesurfaceprod

6、uctsshouldapproachequilibrium,whichpredictsonlyafewpercenteth-areaswerelessthan1m2/g,theseloadingsylene.Thisprocessispromisingforthereplacementofsteamcrackingintheformedthickfilmsandlargeparticlesontheproductionofethylene.aluminasurfaceafterheatingtodecomposethesalts.Ethyleneisthemajorinterme

7、diateintheides(2)hasbeenexploredasanalternativetoThecatalystwassealedinaquartzreactorchemicalindustry,withmorethan25billionsteamcrackingbecauseofitspotentiallytubewithaluminacloth.Ethane,O,andH22kilogramsproducedintheUnitedStatesan-highersele