Morphology and Adsorption Properties of Bimetallic Nanostructured Coatings on Pyrolytic Graphite
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ICAL PHYSICS OF NANOMATERIALS
Morphology and Adsorption Properties of Bimetallic Nanostructured Coatings on Pyrolytic Graphite M. V. Grishina, *, A. K. Gatina, S. Yu. Sarvadiia, V. G. Slutskiia, B. R. Shuba, A. I. Kulakb, T. N. Rostovshchikovac, S. A. Gurevichd, V. M. Kozhevind, and D. A. Yavsind a
Semenov Federal Research Center for Physics, Russian Academy of Sciences, Moscow, 119991 Russia of General and Inorganic Chemistry, National Academy of Sciences of Belarus, Minsk, 220072 Belarus c Moscow State University, Moscow, 119991 Russia d Ioffe Physical Technical Institute, Russian Academy of Sciences, St. Petersburg, 194021 Russia *e-mail: [email protected]
bInstitute
Received April 26, 2019; revised May 19, 2019; accepted May 20, 2019
Abstract—The paper presents the results of studies of coatings formed by gold, copper, nickel, and palladium nanoparticles in various combinations on the surface of highly oriented pyrolytic graphite. It was shown that the structure of the bimetallic coatings and the adsorption of hydrogen, oxygen, and carbon monoxide on them are affected by interactions between dissimilar nanoparticles. Keywords: nanostructured coatings, gold, copper, nickel, palladium, hydrogen, oxygen, carbon monoxide, hydrogen, adsorption DOI: 10.1134/S1990793120040065
INTRODUCTION Bimetallic catalysts exhibit high catalytic activity in various chemical reactions [1]. The catalysts based on gold and copper nanoparticles are widely used, for example, in the oxidation of various hydrocarbons: benzyl alcohol, propylene, methanol, and others [2– 9], and in the low-temperature oxidation of CO [10– 12]. The composites consisting of mixtures of gold and nickel nanoparticles were shown to have higher activity than the single-component nanostructured gold and nickel catalysts in steam reforming and CO oxidation [13] and in cross-condensation of alcohols [14]. The use of Au–Ni catalysts increases the yield of allylbenzene isomerization products [15]. These catalysts are characterized by increased activity and stability in hydrodechlorination processes [16]. Nickel-palladium catalysts are characterized by high activity, selectivity, and stability in many redox processes [17, 18]. The Ni0.4Pd0.6 catalysts participate in direct synthesis of Н2О2 and surpass the monometallic palladium catalyst in stability and selectivity [19]. The addition of palladium to nickel in a ratio of 3 : 7 allows synthesis of an effective catalyst for the decomposition of hydrazine into simple substances [20]. NiPd nanoparticles have increased catalytic activity compared to Pd particles, for example, in cross-coupling of vinyl and aryl halides with terminal alkynes [21], hydrogenation of a number of nitro-substituted aromatic hydrocarbons under mild conditions
[22], hydrogen energy processes [23], and hydrodechlorination of chlorohydrocarbons [24]. Thus, bimetallic coatings can become the basis of new, more efficient systems. At the same time, the factors governing the unique properties of bimetallic catalysts remain unknown, although this
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