Tetrachloromethane Hydrodechlorination over Palladium-Containing Nanodiamonds
- PDF / 317,168 Bytes
- 6 Pages / 612 x 792 pts (letter) Page_size
- 96 Downloads / 164 Views
achloromethane Hydrodechlorination over Palladium-Containing Nanodiamonds P. A. Kalmykova, b, *, N. A. Magdalinovaa, M. S. Gruzdevc, ***, A. A. Lysenokb, E. G. Belkinaa, and M. V. Klyueva, ** aIvanovo
State University, Ivanovo, 153025 Russia AO Generium, Vol’ginskii vill., Petushinskii region, Vladimir oblast, 601125 Russia c Krestov Institute of Solution Chemistry, Russian Academy of Sciences, Ivanovo, 153045 Russia *e-mail: [email protected] **e-mail: [email protected] ***e-mail: [email protected] b
Received February 20, 2020; revised May 25, 2020; accepted June 11, 2020
Abstract—Using nanodiamonds of the UDD-STP brand 1 wt % palladium-containing nanodiamonds are obtained and tested as catalysts of tetrachloromethane hydrodechlorination under mild conditions (solvents, ethanol and methanol; Т = 298–318 K; PH2 = 0.1 MPa). The catalytic properties of the obtained material and a palladium-containing analog based on activated carbon are compared. It is shown that the hydrodechlorination reaction occurs in a stepwise manner via two pathways: to form products with a smaller content of chlorine, for example, chloroform, and to yield oxygen-containing products, for example, diethyl carbonate. The qualitative and quantitative compositions of reaction products are determined by gas chromatography/mass spectrometry. Keywords: hydrodechlorinationе, palladium-containing nanodiamonds, tetrachloromethane, chloroform, diethyl carbonate DOI: 10.1134/S0965544120100060
Catalytic systems based on carbon nanomaterials (nanotubes, nanofibers, nanodiamonds, graphenelike nanomaterials) containing transition metals are of potential interest for the chemical and pharmaceutical industries because of their high catalytic activity in the hydrogenation reactions of unsaturated organic compounds and compounds containing various functional groups [1]. The study of these systems may help in solving one of the key environmental issues related to the utilization of chloro-organic compounds employed in various areas of human activity. One of the methods of utilizing chloro-organic compounds is an environmentally friendly catalytic hydrodechlorination. However, high cost and low stability of the existing catalysts limit the development of this method. A solution to this problem may be the use of catalysts based on nanodiamonds exhibiting unique properties and nanosized palladium particles, which are efficiently used in the hydrogenation of organic compounds [2, 3]. The catalytic hydrodechlorination of tetrachloromethane (CCl4), a representative of the family of chloro-organic compounds, in the presence of palladium-containing activated carbon and Sibunite, alu-
mina, and titania is carried out both the gas phase and in the presence of solvents at high hydrogen pressures (up to 10 atm) and high temperatures (up to 350°С). The conversion of CCl4 is 30–90%, and a mixture of products is always formed, which indicates that this is a multistage process. In the case of palladium-containing carbon supports (activated carbon, Sibunite) the quantitative CCl4
Data Loading...
