| 摘要 |
Disclosed herein are methods of making xylene isomers. The methods generally include contacting an aromatics-comprising feed with a non-sulfided catalyst under conditions suitable for converting the feed to a product comprising xylene isomers. The catalyst includes a support impregnated with a hydrogenation component. The support includes a macroporous binder and a sie ve selected from the group consisting of a medium pore sieve, a large pore siev e, and mixtures thereof. The selection of the sieve will depend upon the size o f the molecules in the feed, intermediate, and product that can be expected fr om the catalytic reactions. When the molecules are expected to be large, a larg e pore sieve should be used. In contrast, when the molecules are expected to b e smaller, either a large pore sieve, a medium pore sieve, or a mixture thereo f may be used. The macropores within the support have been found to be especially beneficial because they help to overcome diffusional limitations observed when utilizing highly-active catalysts lacking such macropores.</SD OAB> |
