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Isovalent Substitutions in Composite Catalysts Na/W/Mn/SiO2

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Abstract

Isovalent analogues of the composite catalyst Na/W/Mn/SiO2 prepared by solid-phase reactions, namely, Li/Na(Rb)/W/Mn/SiO2, Na(Li,Rb,Cs)/Mo/Mn/SiO2, Na/W/Re/SiO2, Na/W/Mn/GeO2, and a nonisovalent analogue Mg(Ca,Sr,Ba)/W/Mn/SiO2 were studied by X-ray powder diffraction. The composites Li/Na/W/Mn/SiO2 and Li/Rb/W/Mn/SiO2 having an equimolar contents of alkali elements with nonadditive changes in SiO2 matrix polymorphism and the formation of mixed tungstates show equally high product yields (23–24%) in oxidative coupling of methane (OCM), these yields being comparable to those observed for Na/W/Mn/SiO2. Substitutions of W by Mo, Mn by Re, and Si by Ge in the composite Na/W/Mn/SiO2, as well as substitutions of Na by Mg, Ca, Sr, and Ba, change the phase constitution of the composite and reduce its catalytic activity.

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Funding

This study was performed in the frame of the Governmental Assignment to the Kurnakov Institute in the field of fundamental research (synthesis of composites and determination of their phase constitution), and was supported by the Presidium and the Russian Academy of Sciences via Program No. 14 “Physical chemistry of adsorption phenomena and actinide nanoparticles” (catalytic experiments) and by the Ministry of Education and Science of Russia (Governmental Assignment “Leading Researchers on an Ongoing Basis”, project no. 4.6718.2017/6.7, profile no. 1422).

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Authors and Affiliations

  1. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, 119991, Moscow, Russia

    G. D. Nipan, A. S. Loktev, A. G. Dedov & I. I. Moiseev

  2. Russian State University of Oil and Gas, 119991, Moscow, Russia

    A. S. Loktev, A. G. Dedov & I. I. Moiseev

  3. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, 119991, Moscow, Russia

    A. S. Loktev, A. G. Dedov & I. I. Moiseev

Authors
  1. G. D. Nipan
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  2. A. S. Loktev
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  3. A. G. Dedov
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  4. I. I. Moiseev
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Corresponding author

Correspondence to G. D. Nipan.

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Translated by O. Fedorova

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Nipan, G.D., Loktev, A.S., Dedov, A.G. et al. Isovalent Substitutions in Composite Catalysts Na/W/Mn/SiO2. Russ. J. Inorg. Chem. 64, 1115–1119 (2019). https://doi.org/10.1134/S0036023619090158

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  • DOI: https://doi.org/10.1134/S0036023619090158

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