Kinetics of Thermal Hydrodealkylation of Mesitylene,m-Xylene, and Toluene

Shull, S. E.; Hixson, A. N.

doi:10.1021/i260018a007

Cited by 10 publications

(2 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, further experiments showed that this was not the case. In fact, the literature shows that direct toluene dealkylation forming benzene and methane is typically occurs in H 2 atmosphere, either thermally [43] or catalyzed by metal oxides [44,45]. By contrast, over zeolites the transformation of toluene mainly proceeds via a bimolecular disproportionation that produces benzene and xylene [46,47], which are not the major products observed in our experiments.…”

Section: Distribution Of Products Evolved From Decomposition Of the Smentioning

confidence: 53%

Role of a phenolic pool in the conversion of m-cresol to aromatics over HY and HZSM-5 zeolites

Resasco

2014

Applied Catalysis A: General

View full text Add to dashboard Cite

The conversion of m-cresol over two acidic zeolites has been studied on a micro-pulse reaction system in the temperature range of 400-600 o C. The zeolites were HZSM-5 and HY and had the same Si/Al ratio of 40. At 400 o C both zeolites were found to be highly efficient in trapping irreversibly the phenolic reactant. As the temperature increased, the extent of phenolic trapping was lower, resulting in a reduced amount of carbonaceous deposits, while the coke became more graphitic. While m-cresol only produced isomers and transalkylation vapor phenolic products, the vast majority of the amount of injected m-cresol resulted in condensed products on the surface that lead to the formation of a phenolic pool. Therefore, the aromatic hydrocarbons that dominate the reactor output originate from the cracking of the surface pool. At low reaction temperature, toluene is the major pool cracking product, but, at higher temperatures the selectivity to benzene increases. Independent measurements of toluene and xylene conversion, under the same conditions, indicate that these changes in selectivity are not due to secondary reactions of toluene to benzene, but rather a change in the cracking pattern of the surface pool.

show abstract