Abstract
The alkylation of benzene with ethanol over pure and modified (with phosphorous and boron) HZSM5 zeolites is reported. The results, when compared with those obtained using ethylene as the alkylating agent, support the hypothesis of Anderson et al. [5] that the ethyl group in ethylbenzene is formed from ethanol without the intermediate formation of ethylene. Modification of HZSM5 with phosphorous enhances the selectivity towards formation of ethyl benzenes. This is attributed to the elimination of the strong acid sites in HZSM5 by added phosphorous. The acidity spectra obtained by the temperature-programmed desorption of NH 3 from these catalysts support the above conclusions.
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