| 摘要 |
<p>VAPOR PHASE NITRATION CATALYSTS AND PROCESSES FOR THE PREPARATION AND USE THEREOF Aromatic compounds are nitrated in the vapor phase via a process comprising contacting the aromatic compounds with a nitrating agent in the presence of a nitration promoting catalyst. Such catalysts are prepared by contacting a Group 4b-Group 3b metal oxide composition represented by the empirical formula: (M1aM2bOc)x(NO2)y wherein M1 is at least one element selected from Group 4b of the Periodic Table of the Elements, M2 is at least one element selected from Group 3b of the Periodic Table of the Elements, a is 1, b is 0 to 20, c is a number taken to satisfy the average valences of M1 and M2 in the oxidation states in which they exist in the composition, x is 1, and y is 0 to c, with a catalytically effective amount of sulfur trioxide. The catalysts are particularly effective to catalyze the vapor phase nitration of chlorobenzene and are characterized in such reaction by providing a para/ortho isomer distribution ratio of at least about 2/1.</p> |
