Alkane Carbonylation with Carbon Monoxide on Sulfated Zirconia: NMR Observation of Ketone and Carboxylic Acid Formation from Isobutane and CO
This work was supported by grant No. 99-03-32454 from the Russian Foundation for Basic Research (RFBR) and in part by a joint RFBR-INTAS grant (No. 95-0194). The authors sincerely thank Dr. V. N. Sidelnikov for GC-MS analysis.
Abstract
Coadsorbed water determines the reaction products when isobutane undergoes carbonylation by CO on a sulfated zirconia catalyst at 70°C. This is shown by the results of in situ solid-state 13C NMR and ex situ 13C high-resolution NMR spectroscopy and by GC-MS analyses. Methyl isopropyl ketone selectively forms in the absence of water, while pivalic acid represents the primary reaction product the presence of coadsorbed water (see scheme).