Stoichiometry and Structural Effects in Alcohol Chemisorption/Temperature-Programmed Desorption on MoO3

Article abstract of DOI:10.1021/ja00269a031

The mechanism of alcohol oxidation over MoO3 has been examined by using temperature-programmed desorption spectroscopy (TPD) with simultaneous microbalance and mass spectral detection.Two types of experiments are reported.The alcohol structure has been varied over the sequence methyl, ethyl, 2-propyl, tert-butyl, and systematic changes in the amount of chemisorption, the peak desorption temperature, and the nature of the products have been observed.The amount of water produced during chemisorption of ethyl alcohol on MoO3 at room temperature has been measured.This determination makes it possibile to estimate the coverage of alkoxy grups after the chemisorption stage.The fate of these ethoxy groups during subsequent TPD can be followed.A stoichiometric accounting of both acetaldehyde production and catalyst reduction can be made.