| 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 composition represented by the empirical formula: (M<1a>M<2b>Oc)x(NO2)y wherein 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. Such catalyst compositions are prepared by forming a mixture of at least one Group 4b oxide or compound convertible by heat into such Group 4b oxide and at least one Group 3b oxide or compound convertible by heat into such Group 3b oxide and calcining the mixture at a temperature of at least 125 DEG C. They 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 1.9/1.</p> |
