Abstract
An isotopic study utilizing methane- 13 C shows that the product toluene and xylenes formed from its reaction at high pressure (5.5 MPa, 400 °C) with benzene, over Cu/beta and H-beta zeolites, contain substantially methyl- 13 C substituents. It is therefore concluded that direct methylation of benzene with methane is possible under these conditions in a batch reactor. However, a second mechanism can also be recognized in which methylbenzene is formed by fragmentation and rearrangement of benzene without addition of methane gas.
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