Abstract
Using a combination of mass spectrometry, in situ quick extended X-ray absorption fine structure, high-resolution transmission electron microscopy, and hydrogen chemisorption, we studied the reactions taking place during different pretreatments of the catalyst precursor [Pt}2{}+{(NH{3}){4}](NO{3}}-{){2} impregnated on high-surface-area SiO{2} (400 m}3{/g). Direct reduction in hydrogen leads to the formation of
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