The perfect crystalline structure, an ordered system of uniform micropores, thermal stability, and adjustable chemical composition make zeolites indispensable in many important industrial processes. Recently, a number of new extra-large pore zeolites being of the greatest interest for oil industry and synthesis of specialty chemicals was prepared as germinates and germanosilicates. However, the most Ge-containing zeolites are not thermally and hydrothermally stable ones, which limit their practical application. Thus, improving hydrolytic stability of extra-large pore germanates and germanosilicates is of high importance. The aim of this work consists in optimization of operational characteristics (e.g. stability, cost) and physico-chemical properties (e.g. chemical composition, the nature and concentration of acid sites) of extra-large pore germanate zeolites by isomorphous substitution of Ge with Si, Ti, Zr and Sn. This can open the way for obtaining new materials with different properties that can either improve current technologies or lead to new processes.
Five relevant publications of the research group
„Two-dimensional zeolites: current status and perspectives“, Chem. Rev., 114 (2014), Wieslaw J. Roth, Petr Nachtigall, Russell E. Morris and Jiří Čejka.
„Catalysis by Dynamically Formed Defects in a Metal–Organic Framework Structure: Knoevenagel Reaction Catalyzed by Copper Benzene-1,3,5-tricarboxylate“ ChemCatChem, 6 (2014) Miroslav Položij, Miroslav Rubeš, Jiří Čejka, and Petr Nachtigall.
„A family of complex zeolites with controlled pore size prepared through a ‚top down’method“, Nature Chemistry 5 (2013) 628, Wieslaw J. Roth, Petr Nachtigall, Russell E. Morriss, Paul S. Wheatley, Valerie Seymour, Sharon E. Ashbrook, Pavla Chlubná, Lukáš Grajciar, Miroslav Položij, Zrnošt Zukal, Oleksiy Shvets, Jiří Čejka.
“The ADOR mechanism for the synthesis of new zeolites” Pavla Eliášová, Maksym Opanasenko, Paul Wheatley, Mariya Shamzhy, Michal Mazur, Petr Nachtigall, Wieslaw J. Roth, Russell E. Morris, Jiří Čejka, “ADOR mechanism for the synthesis of new zeolites”, Chem. Soc. Rev. 44 (2015) 7177.
“Synthesis of ‘unfeasible’ zeolites” M. Mazur, P. S. Wheatley, M. Navarro, W. R. Roth, M. Polozij, A. Mayoral, P. Eliasova, P. Nachtigall, J. Cejka, R. E. Morris, “Synthesis of ‘unfeasible’zeolites”, Nature Chem. 8 (2016) 58-62
Current research grants of the group
Czech-Bavarian Project – Design Principles for Structural Materials – Synthesis, Characterization, Application (2017 – 2020)
„ADORable catalysts“ ExPro project GAČR (2019 – 2023)
Primus Research Program of the Charles University project number PRIMUS/17/SCI/22 “Soluble zeolites” (2018 – 2020)
Neuron funding program (project number 31/2017) (2018 – 2019)
Research group leader
Prof. Čejka Jiří
Dr. Opanasenko Maksym