| 摘要 |
<p>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: (M<1>aM<2>bOc)x(NO2)y where M<1> is at least one element selected from Group 4b of the Periodic Table of the Elements, M<2> 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 M<1> and M<2> 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> |
