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Impact of Testing Temperature on the Structure and Catalytic Properties of Au Nanotubes Composites

1The Institute of Nuclear Physics of the Republic of Kazakhstan, 050032, Ibragimov str., 1, Almaty, Kazakhstan

2L.N. Gumilyov Eurasian National University, Satpaev str., 5, 010008 Astana, Kazakhstan

3The Ural Federal University named after the first President of Russia B. N. Yeltsin, Mira str. 19, 620002 Yekaterinburg, Russian Federation

Received: 23 Jan 2018; Revised: 19 Mar 2018; Accepted: 19 Mar 2018; Published: 4 Dec 2018; Available online: 14 Nov 2018.
Open Access Copyright (c) 2018 by Authors, Published by BCREC Group under http://creativecommons.org/licenses/by-sa/4.0.

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Abstract

In the paper, the catalytic activity of composites based on gold nanotubes and ion track membranes was studied using bench reaction of the p-nitrophenol (4-NP) reduction in the temperature range of 25-40 °C. The efficiency of the prepared catalysts was estimated on the rate constant of the reaction and by conversion degree of 4-NP to p-aminophenol (4-AP). The comprehensive evaluation of the structure was performed by X-ray diffraction and scanning electron microscopy. A decreasing of the composites activity was observed when the reaction were carried out at the temperature over 35 °C, due to an increased average crystallite size from 7.31±1.07 to 10.35±3.7 nm (after 1st run). In temperature range of 25-35 °C the efficiency of the composite catalyst was unchanged in 3 runs and decreases by 24-32 % after the 5th run. At the high temperature of 40 °C after the 5th run the composite become completely  catalytically inert. 

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Keywords: Gold Nanotubes; Composite Membrane; Catalysis; Ion Track Membranes
Funding: Ministry of Education and Science of the Republic of Kazakhstan under project АP05130797

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