

Synthesis of Hydroxylamine Sulfate via NO Hydrogenation on Pt/Graphite Catalysts: I. Physicochemical State of Platinum Particles and the Support Surface in the Catalysts
https://doi.org/10.18412/1816-0387-2018-3-16-25
Abstract
SEM, TEM, XRD, XPC, and CO chemisorption techniques were used for studying physicochemical state of supported platinum and nickel surface in a number of industrial catalysts 0.5 wt % Pt/graphite (fresh, used for hydroxylamine sulfate synthesis via NO hydrogenation in sulfuric acid, regenerated samples). It was shown that the platinum particles agglomerate during the process, while the catalyst regeneration leads to finer dispersion of the supported metal. It is commonly accepted that the platinum surface is modified by sulfur during the catalyst synthesis and regeneration but XPS studies gives no evidence of this fact. The data obtained for the first time demonstrate that there are surface nitrogencontaining graphite species which are responsible for modification of adsorbability of platinum particles with respect to CO. Perhaps, the latter observation is one of the factors affecting the catalytic behavior of platinum in hydrogenation of NO.
About the Authors
A. N. BobrovskayaRussian Federation
P. A. Simonov
Russian Federation
A. V. Bukhtiyarov
Russian Federation
R. I. Kvon
Russian Federation
N. A. Rudina
Russian Federation
A. V. Romanenko
Russian Federation
V. M. Khodorchenko
Russian Federation
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Review
For citations:
Bobrovskaya A.N., Simonov P.A., Bukhtiyarov A.V., Kvon R.I., Rudina N.A., Romanenko A.V., Khodorchenko V.M. Synthesis of Hydroxylamine Sulfate via NO Hydrogenation on Pt/Graphite Catalysts: I. Physicochemical State of Platinum Particles and the Support Surface in the Catalysts. Kataliz v promyshlennosti. 2018;18(3):16-25. (In Russ.) https://doi.org/10.18412/1816-0387-2018-3-16-25