THE ADSORPTION AND REACTION OF CYCLOHEXANONE ON THE PT(111) SURFACE

The interaction of cyclohexanone with the Pt(111) surface has been inv estigated by HREELS and TDS. At 160 K, the chemisorption of cyclohexan one induces a ''red-shift'' of the C=O stretch band and a decrease in work function. Heating the sample from 220 to 370 K leads to complete disappearance of the dominant CH2 rocking band at 720 cm(-1) and the C =O stretching band at 1650 cm(-1) indicating the dehydrogenation of th e entire adlayer to form intermediate species. Strong bands of the deh ydrogenated species appear at 860 and 3000 cm(-1) which is different f rom phenoxy on Pt(111). Above similar to 380 K, the dehydrogenated spe cies is decomposed to form hydrocarbon fragments and C=O which directl y desorbs into the vacuum. (C) 1997 Elsevier Science B.V.