我們計畫研究常壓下甲醇在銠奈米粒子及銠-金合金奈米粒子上的分解反應。此研究的目的在銜接超高真空模型系統與真實觸媒在氣壓上的差距，因而闡明氣壓對反應的效應。甲醇分解反應對燃料電池的應用非常重要，也是產氫的重要來源，因而被廣泛的研究。我們之前的研究，使用超高真空表面探測技術，已經指出直徑小於1.5 nm的銠奈米粒子以及加溫到450 K之上的銠奈米粒子對於甲醇分解具有非常高的催化能力；參雜一點銠的銠-金合金奈米粒子也具有非常好的反應能力。然而，這些奈米粒子在真實反應的常壓下是否仍具非常高的催化能力仍是個問號。本計畫就想釐清這些問題並且了解提升反應物氣壓對催化的效應。我們將使用常壓光電子能譜，並且發展具時間解析的紅外光吸收能譜，以及常壓產物氣體分析反應腔。 ;We propose to study decomposition of methanol on Rh and Rh-Au bimetallic nanoclusters supported on thin-film Al2O3/NiAl(100) under ambient pressures. The study aims to bridge the pressure gap between model systems and real-world catalysts, and therefore shed light on the effect of enhanced reactant pressure. Methanol decomposition has been the subject of intense research as this process is a source of hydrogen and also its aqueous process is a major part of direct methanol fuelcell (DMFC). Our preceding studies have demonstrated with UHV experiments that the oxide-supported Rh nanoclusters with diameter smaller than 1.5 nm or annealed to above 450 K exhibit extraordinary reactivity toward methanol decomposition; Au nanoclusters decorated with limited Rh also show highly promoted reactivity. Nevertheless, whether or not these Rh-based nanoclusters remain active under real reaction pressures is unclear. The present investigation has an aim to shed light on the issues and thus the effect of enhanced reactant pressure. The scheduled investigation contains measurements with ambient pressure photoelectron spectroscopy (AMPES) and development of time-resolved infrared absorption spectroscopy (TR-IRAS) and production gas analysis. The results will benefit the design of catalysts with superior reactivity.
