Selective hydrogenation of acetylene on SiO2-supported Ni-Ga alloy and intermetallic compound-中国Betway体育网页登陆

摘要 Ni/SiO2andbimetallicNixGa/SiO2catalystswithdifferentNi/Gaatomicratios(x=10~2)wereinvestigatedfortheselectivehydrogenationofacetylene.ItwasfoundthatNixGa/SiO2showedhigherselectivitytoethylenethanNi/SiO2.ThisisattributedtotheformationNi-GaalloyandNi3Gaintermetalliccompound(IMC)wheretherewasachargetransferfromGatoNi,whichisfavorableforreducingtheadsorptionstrengthandamountofethyleneonNiatoms.Asaresult,theover-hydrogenation,theC–Cbondhydrogenolysisandthepolymerizationweresuppressed,andsubsequentlytheselectivitytoethylenewasenhanced.WiththedecreaseofNi/Gaatomicratio,theactivityandstabilityoftheNixGa/SiO2catalystsincreasedfirstandthendecreased,whiletheethyleneselectivitytendedtoincrease.Ni5Ga/SiO2exhibitedthebestperformance.Undertheconditionsof180°C,0.1MPa,andareactant(1.0vol%acetylene,5.0vol%H2and94vol%N2)withthespacevelocityof36,000mLh-1g-1,theacetyleneconversionmaintainedat100%onNi5Ga/SiO2during120htimeonstreamandtheselectivitytoethylenewas75%~81%afterreactionfor68h.ItwasalsofoundthattheformationofNi-GaalloyandNi3GaIMCsuppressedtheincorporationofcarbontoformNiCx,subsequentlyenhancingthecatalyststability.Additionally,withincreasingtheGacontent,thecatalystacidamountandstrengthtendedtoincrease,whichpromotedthepolymerizationandcarbondepositionandsothecatalystdeactivation.

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Selective hydrogenation of acetylene on SiO2-supported Ni-Ga alloy and intermetallic compound

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