Abstract: The purpose of this work is to present our latest achievements in the design, synthesis and development of a new catalytic microreactor for the processes of selective and continuous synthesis of substances with added value, used in fine organic synthesis and pharmaceutical industries. In this advanced reactor device, metal nanoparticles are embedded in mesoporous materials, which are deposited in the form of highly active and selective catalytic films on the walls of capillary microchannels with diameters of 530 μm. Potentially the most stable coatings are crystalline or amorphous titania-based mixed metal oxides synthesized by the sol-gel method and containing embedded catalytically active PdZn nanoparticles. The catalytic properties of PdZn/TixM1-xO2±y (х = 0; М = Се, х =0.95; Zr, х = 0.8) for the liquid phase hydrogenation of 2-methyl-3 butyn -2-ol are tested with an emphasis on the stability of the catalyst during the reaction. The initial activity of the microcapillary reactor increases for cerium doped titania, which is related to the adsorption properties and activity of the active site. The surface of the active site changes under the reaction conditions. Residues of O2 lead to decomposition of selective Pd-Zn centers and oxidation of palladium. The modification of the morphology and the electronic structure of active component by titania doping with Ce and Zr are accompanied with a decreased stability. The developed Pd50Zn50/TiO2 coating was the most stable and showed a higher activity (1.5 gMBE·gPd -1·sec) and selectivity (96.7%) in comparison with the coatings described earlier in the literature and with the industrial Lindlar catalyst, and retained high catalytic performance after 88 hours of reaction.

Cite: Okhlopkova L. , Kerzhentsev M. , Ismagilov Z.
Selective Hydrogenation of 2-methyl-3-butyn 2-ol in Microcapillary Reactor for Fine Organic Synthesis. Effect of Support Doping on Stability and Kinetic Parameters
13th International Exergy, Energy and Environment Symposium 14-17 Mar 2022