TY  - JOUR
U1  - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed)
A1  - Drönner, Jan
A1  - Bijerch, Karim
A1  - Hausoul, Peter
A1  - Palkovits, Regina
A1  - Eisenacher, Matthias
ED  - Requies, Jesús M.
ED  - Cagigal, Victoria Laura Barrio
ED  - Viar , Nerea
T1  - High-Temperature-Treated LTX Zeolites as Heterogeneous Catalysts for the Hock Cleavage
JF  - Catalysts
N2  - Hydroxybenzene, commonly known as phenol, is one of the most important organic commodity chemicals. To produce phenol, the cumene process is the most used process worldwide. A crucial step in this process is the Hock rearrangement, which has a major impact on the overall cumene consumption rate and determines the safety level of the process. The most used catalyst for the cleavage of cumene hydroperoxide (CHP) is sulfuric acid. Besides its strong corrosive property, which increases plant investment costs, it also requires neutralization after the decomposition step to prevent side reactions. In this study, we show that high-temperature-treated Linde Type X (LTX) zeolites exhibit a high activity for the peroxide cleavage step. In addition, the structure–activity relationship responsible for this good performance in the reaction system of the HOCK rearrangement was investigated. XRPD analyses revealed the formation of a new phase after temperature treatment above 900 °C. The Si/Al ratio determined by EDX suggested the formation of extra-framework aluminum, which was confirmed by solid-state NMR analysis. The newly formed extra-framework aluminum was found to be responsible for the high catalytic activity. BET analyses showed that the surface area drops at higher calcination temperatures. This leads to a lower catalytic activity for most known reactions. However, for this study, no decrease in activity has been observed. The newfound material shows extraordinarily high activity as a catalyst in the HOCK cleavage and has the potential to be a heterogeneous alternative to sulfuric acid for this reaction.
KW  - Heterogene Katalyse
KW  - Hock Cleavage
KW  - Heterogeneous Catalysis
KW  - Cumene Hydroperoxide
KW  - Extra-Framework Aluminum
KW  - Zeolites
KW  - Zeolith
Y1  - 2023
UN  - https://nbn-resolving.org/urn:nbn:de:hbz:832-epub4-21040
SN  - 2073-4344
SS  - 2073-4344
U6  - https://doi.org/10.3390/catal13010202
DO  - https://doi.org/10.3390/catal13010202
VL  - 13
IS  - 1
SP  - 9
S1  - 9
PB  - MDPI
ER  -