Qhov sib txawv tseem ceeb ntawm Lindlar thiab Rosenmund catalysts yog Lindlar catalyst muaj palladium ntawm calcium carbonate, hos Rosenmund catalyst muaj palladium ntawm barium sulfate.
Ib tus catalyst yog cov tshuaj lom neeg lossis cov khoom siv lom neeg uas muaj txiaj ntsig zoo hauv kev txo qis lub zog ua kom muaj zog ntawm cov tshuaj tiv thaiv tshwj xeeb txhawm rau txhawm rau nce tus nqi ntawm cov tshuaj tiv thaiv. Catalysts tsis noj thaum lub sij hawm cov tshuaj tiv thaiv; Yog li, lawv tau hloov kho tom qab ua tiav cov tshuaj tiv thaiv. Lindlar thiab Rosenmund catalysts yog ob yam tshuaj lom neeg.
Lindlar Catalysts yog dab tsi?
Lindlar catalyst yog cov tshuaj tiv thaiv uas muaj palladium ntawm calcium carbonate. Peb tuaj yeem categorize nws li heterogeneous catalyst vim tias nws muaj ob yam ua haujlwm ua ib chav tsev (palladium + calcium carbonate). Cov catalyst no yog tsim los ntawm depositing palladium ntawm calcium carbonate, uas yog tom qab ntawd lom siv ntau hom hlau lead lossis sulfur. Lindlar catalysts yog qhov tseem ceeb hauv cov tshuaj tiv thaiv xws li hydrogenation ntawm alkynes kom tau txais alkenes. Qhov no catalyst compound tau muab npe tom qab nws tus tsim, Herbert Lindlar.
Lindlar catalyst muaj nyob rau hauv cov khoom lag luam. Nws tuaj yeem npaj los ntawm kev txo palladium chloride hauv slurry ntawm calcium carbonate. Tom qab cov tshuaj tiv thaiv no, peb yuav tsum tau ntxiv cov hmoov lead acetate rau cov tshuaj tiv thaiv no. Qhov no yog hu ua catalyst lom. Muaj qee qhov lwm txoj hauv kev ua kom muaj tshuaj lom, xws li siv lead oxide thiab quinolone. Feem ntau, cov ntsiab lus ntawm palladium hauv Lindlar catalyst yog 5%.
Thaum xav txog cov txheej txheem ntawm kev ua ntawm Lindlar catalyst, nws ua los ntawm deactivating cov chaw palladium siv lead, uas yog ib qho tseem ceeb hauv kev tiv thaiv kev tsim ntawm alkane es tsis txhob ntawm alkene thaum lub sij hawm hydrogenation ntawm alkyne rau alkene. Yog li ntawd, yog hais tias cov reactant compound muaj ob daim ntawv cog lus thiab triple bonds, tsuas yog triple bonds raug txo nyob rau hauv lub xub ntiag ntawm Lindlar catalyst.
Rosenmund Catalysts yog dab tsi?
Rosenmund catalyst yog ib qho tshuaj tiv thaiv uas muaj palladium ntawm barium sulfate. Cov tshuaj tiv thaiv peb siv cov catalyst no yog hu ua Rosenmund txo. Nws yog hom tshuaj tiv thaiv hydrogenation qhov twg acyl chloride xaiv tau txo qis los ua ib qho aldehyde. Cov catalyst no tau muaj npe tom qab nws tus tsim, Karl Wilhelm Rosenmund.
Hauv Rosenmund catalyst, muaj ob yam khoom: palladium thiab barium sulfate, yog li, peb tuaj yeem categorize nws raws li cov catalyst heterogeneous. Barium sulfate muaj thaj tsam qis, uas tuaj yeem txo cov haujlwm ntawm palladium. Qhov kev txo qis no tuaj yeem tiv thaiv kev txo qis dua. Feem ntau, cov catalyst no ntxiv nrog cov tshuaj lom (catalyst lom) txhawm rau txo cov kev ua ntawm qee yam acyl chlorides. Keeb kwm, thiourea yog cov tshuaj lom siv rau Rosenmund catalyst.
Peb tuaj yeem npaj Rosenmund catalyst los ntawm kev txo cov tshuaj palladium (II) chloride tov nyob rau hauv muaj barium sulfate. Cov tshuaj txo qis feem ntau yog formaldehyde. Cov catalyst no tseem ceeb hauv kev npaj aldehydes, tab sis formaldehyde tsis tuaj yeem npaj tau vim tias formyl chloride (acyl chloride) tsis ruaj khov ntawm chav tsev kub.
Qhov txawv ntawm Lindlar thiab Rosenmund Catalysts yog dab tsi?
Lindlar thiab Rosenmund catalysts yog cov tshuaj sib xyaw ua ke uas tseem ceeb hauv kev txhim kho tus nqi ntawm cov tshuaj tiv thaiv tshuaj los ntawm kev txo qis lub zog ua kom muaj zog ntawm cov tshuaj tiv thaiv. Qhov sib txawv tseem ceeb ntawm Lindlar thiab Rosenmund catalysts yog Lindlar catalyst muaj palladium ntawm calcium carbonate, hos Rosenmund catalyst muaj palladium ntawm barium sulfate.
Hauv qab infographic teev ntau qhov sib txawv ntawm Lindlar thiab Rosenmund catalysts.
Summary – Lindlar vs Rosenmund Catalysts
Lindlar thiab Rosenmund catalysts yog cov tshuaj sib xyaw ua ke uas tseem ceeb hauv kev txhim kho tus nqi ntawm cov tshuaj tiv thaiv tshuaj los ntawm kev txo qis lub zog ua kom muaj zog ntawm cov tshuaj tiv thaiv. Qhov sib txawv tseem ceeb ntawm Lindlar thiab Rosenmund catalysts yog Lindlar catalyst muaj palladium ntawm calcium carbonate, hos Rosenmund catalyst muaj palladium ntawm barium sulfate.
