TY  - JOUR
U1  - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed)
A1  - Drönner, Jan
A1  - Hausoul, Peter
A1  - Palkovits, Regina
A1  - Eisenacher, Matthias
ED  - Requies, Jesús M.
ED  - Ibáñez, José Francisco Cambra
ED  - Cagigal, Victoria Laura Barrio
T1  - Solid Acid Catalysts for the Hock Cleavage of Hydroperoxides
JF  - Catalysts
N2  - The oxidation of cumene and following cleavage of cumene hydroperoxide (CHP) with sulfuric acid (Hock rearrangement) is still, by far, the dominant synthetic route to produce phenol. In 2020, the global phenol market reached a value of 23.3 billion US$ with a projected compound annual growth rate of 3.4% for 2020–2025. From ecological and economical viewpoints, the key step of this process is the cleavage of CHP. One sought-after way to likewise reduce energy consumption and waste production of the process is to substitute sulfuric acid with heterogeneous catalysts. Different types of zeolites, silicon-based clays, heteropoly acids, and ion exchange resins have been investigated and tested in various studies. For every type of these solid acid catalysts, several materials were found that show high yield and selectivity to phenol. In this mini-review, first a brief introduction and overview on the Hock process is given. Next, the mechanism, kinetics, and safety aspects are summarized and discussed. Following, the different types of heterogeneous catalysts and their performance as catalyst in the Hock process are illustrated. Finally, the different approaches to substitute sulfuric acid in the synthetic route to produce phenol are briefly concluded and a short outlook is given.
KW  - Heterogene Katalyse
KW  - Hock cleavage
KW  - Heterogeneous Catalysis
KW  - Cumene Hydroperoxide
Y1  - 2022
UN  - https://nbn-resolving.org/urn:nbn:de:hbz:832-epub4-19295
SN  - 2073-4344
SS  - 2073-4344
U6  - https://doi.org/10.3390/catal12010091
DO  - https://doi.org/10.3390/catal12010091
VL  - 12
IS  - 1
SP  - 9
S1  - 9
PB  - MDPI
ER  -