XPS study of the stability variations of [M(COD)Cl]2 (M = Ir, Rh) complexes anchored on modified silica in reactions of spin-selective hydrogenation of unsaturated hydrocarbons by parahydrogen

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Resumo

Changes in the composition of anchored [M(COD)Cl]2–NH2–C3H6–SiO2 and [M(COD)Cl]2–P(Ph)2–C2H4–SiO2 (where M = Ir, Rh) catalysts in reactions of gas-phase selective hydrogenation of propene, propyne and 1,3-butadiene with parahydrogen (p-H2) were studied using XPS. The atomic ratio M/Cl has been proposed as an indicator of the stability of the structure of the anchored complex, both at the stage of sample preparation and in the reaction. Based on a comparison of XPS data and the results of catalytic testing using parahydrogen-induced polarization, it is shown that the stability of the anchored {[M(COD)Cl]2–Linker–SiO2} complex during hydrogen activation is a key factor in the catalytic behavior of systems. Such stability is influenced not only by the chosen metal and linker, but also by the nature of the hydrogenated substrate.

Sobre autores

A. Nartova

Boreskov Institute of Catalysis SB RAS

Autor responsável pela correspondência
Email: nartova@catalysis.ru
Rússia, ave. Acad. Lavrentieva, 5, Novosibirsk, 630090

R. Kvon

Boreskov Institute of Catalysis SB RAS

Email: nartova@catalysis.ru
Rússia, ave. Acad. Lavrentieva, 5, Novosibirsk, 630090

L. Kovtunova

Boreskov Institute of Catalysis SB RAS

Email: nartova@catalysis.ru
Rússia, ave. Acad. Lavrentieva, 5, Novosibirsk, 630090

A. Dmitrachkov

Boreskov Institute of Catalysis SB RAS

Email: nartova@catalysis.ru
Rússia, ave. Acad. Lavrentieva, 5, Novosibirsk, 630090

I. Skovpin

Boreskov Institute of Catalysis SB RAS; International Tomography Center SB RAS

Email: nartova@catalysis.ru
Rússia, ave. Acad. Lavrentieva, 5, Novosibirsk, 630090; st. Institutskaya, 3A, Novosibirsk, 630090

V. Bukhtiyarov

Boreskov Institute of Catalysis SB RAS

Email: nartova@catalysis.ru
Rússia, ave. Acad. Lavrentieva, 5, Novosibirsk, 630090

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