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哥擱淺了金蟲 (小有名氣)
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[求助]
【求助摘要翻譯】相關專業(yè):催化化學
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Facile dissociation of reactants and weak binding of intermediates are key requirements for efficient and selective catalysis. However, these two variables are intimately linked in a way that does not generally allow the optimization of both properties simultaneously. By using desorption measurements in combination with high-resolution scanning tunneling microscopy, we show that individual, isolated Pd atoms in a Cu surface substantially lower the energy barrier to both hydrogen uptake on and subsequent desorption from the Cu metal surface. This facile hydrogen dissociation at Pd atom sites and weak binding to Cu allow for very selective hydrogenation of styrene and acetylene as compared with pure Cu or Pd metal alone. |
易與反應物分離以及與中間物間的弱聯(lián)系為高效選擇性催化劑的必備條件。但這兩個變量間聯(lián)系緊密,一般很難同時保證兩者的優(yōu)異性能。我們采用了脫附-高分辨STM(掃描隧道顯微鏡)聯(lián)用技術對催化劑進行測試,發(fā)現(xiàn)Cu表面上的孤立Pd原子可充分減小Cu金屬表面上的吸氫及隨后氫脫附的能量位壘。此類催化劑中Pd原子位點處的氫較易分離,且與Cu間的聯(lián)系較弱,因而較純Cu或Pd金屬對于苯乙烯及乙炔的加氫反應更具選擇性。 |
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