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首页> 外文会议>International Zeolite Conference pt.C; 20040425-30; Cape Town(ZA) >USE OF BIFUNCTIONAL METAL/BASE CATALYTS IN THE DIRECT SYNTHESIS OF MIBK FROM ACETONE: COMPARISON BETWEEN Pt AND Pd CATALYSTS
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USE OF BIFUNCTIONAL METAL/BASE CATALYTS IN THE DIRECT SYNTHESIS OF MIBK FROM ACETONE: COMPARISON BETWEEN Pt AND Pd CATALYSTS

机译：功能性金属/碱催化剂在丙酮直接合成MIBK中的使用：Pt和Pd催化剂的比较

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摘要

The one-step synthesis of MIBK from acetone in gas phase was studied over platinum and palladium catalysts on NaX zeolite (1 wt% of metal). A greater selectivity to MIBK was observed for a H_2/acetone ratio of 0.5 over platinum and of 6.2 over palladium, respectively. Although increasing the reaction temperature caused an increase of the selectivity to condensation products over both metals, the temperatures for which the selectivity to MIBK was maximum were different for the two metals (523 K for PdNaX and 613 K for PtNaX). Decreasing the reduction temperature from 633 to 573 K for PdNaX enhanced the hydrogenation activity and decreased MIBK selectivity. The opposite behavior was observed for PtNaX catalysts which showed this same trend when the reduction temperatures was increased from 633 to 773 K. Also, the activity and the stability over Pd were lower than those over Pt. Selectivities to MIBK as high as 80% were obtained.
机译：在NaX沸石（金属的1 wt％）上用铂和钯催化剂研究了气相中丙酮的一步合成。对于H 2 /丙酮比在铂上为0.5而在钯上为6.2，观察到对MIBK的更大选择性。尽管提高反应温度会导致对两种金属的缩合产物选择性增加，但两种金属对MIBK的选择性最高的温度却有所不同（PdNaX为523 K，PtNaX为613 K）。将PdNaX的还原温度从633 K降低到573 K，可增强氢化活性并降低MIBK选择性。对于PtNaX催化剂，观察到相反的行为，当还原温度从633 K升高至773 K时，表现出相同的趋势。此外，Pd的活性和稳定性均低于Pt。获得对MIBK的选择性高达80％。

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