Multi-Wall Carbon Nanotubes as a Support for Platinum Catalysts for the Hydrodechlorination of Carbon Tetrachloride and Dichlorodifluoromethane

Bonarowska, Magdalena; Lin, Kuan Nan; Jarzyna, Marta Legawiec; Stobiński, Leszek; Juszczyk, W.; Kaszkur, Zbigniew; Karpiński, Zbigniew; Lin, Hong Ming

doi:10.4028/www.scientific.net/ssp.128.261

Cited by 7 publications

(9 citation statements)

References 37 publications

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“…Carbon-containing deposits can be removed by feeding argon into the system. M. Bonarowska et al [105] propose to use Pt catalyst in the process in interaction with carbon nanotubes. It is argued that catalysts of this type are quite stable and show a high selectivity for the formation of chloroform (trichloromethane).…”

Section: Comparative Data Of Hydrodechlorination Of Chlorohydrocarbonsmentioning

confidence: 99%

Theoretical and Applied Aspects of Hydrodechlorination Processes—Catalysts and Technologies

Flid¹,

Kartashov²,

Treger³

2020

Catalysts

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The commercial implementation of hydrodechlorination processes will be an essential step in resolving the problem of environmentally sound organochlorine wastes processing. By now, there is a number of fundamental, applied, and process elaborations of such processes, in which chlorine is almost completely removed from wastes. The review article contains a significant number of results including basic regularities of thermal hydrodechlorination, comprehensive and selective catalytic hydrodechlorination. It discusses thermodynamics, kinetics, and catalysts of gas and liquid phase processes. Considerable attention is paid to hydrodechlorination of vinyl chloride production wastes and utilization of tetrachloromethane, which is the ozone-depleting substance. It also discusses hydrodechlorination of mono-and (poly)chlorobenzenes. The important examples of liquid phase data include hydrogenation using complex hydrides of elements. It also includes several flow sheets of hydrodechlorination processes.Various methods for C-Cl bonds reduction in non-cyclic organochlorine compounds can be divided into the following groups:Catalysts 2020, 10, 216 3 of 52 one should note the reviews [4,10] published in the 1990s. It is noted that catalytic methods are more widely used for hydrodechlorination. Electrochemical ReductionElectrochemical reduction is a complex process in which the speed and direction of reactions depend on many factors. It is characterized by the following features. Two electrons are spent for breaking the C-Cl bond; the half-wave potential in most cases does not depend on the pH of the medium; in general, the electrode reaction is irreversible [1]. There is an approximate linear relationship between the half-wave potential of the reactionsIn [12], a scheme was proposed describing the mechanism of electrochemical reduction of the C-Cl bondRClHowever, there is another point of view, according to which there is a simultaneous transfer of a pair of electrons, similar to that for nucleophilic substitution reactions [1].Electrochemical reduction is carried out on cathodes of copper, zinc, amalgamated zinc, palladium, cadmium, mercury, and lead [13]. The cathodic dechlorination proceeds in an alkaline environment more efficiently than in an acidic one; however, in most cases, acidic electrolytes are used to avoid such side reactions as saponification [13,14]. The recovery is usually carried out in inert solvents, in particular in alcohols. In [13], the influence of the reduction conditions-the cathode material, current density, the nature of electrolyte and solvent, the concentration of the reducible substance, and temperature-on the course of the reaction is described.The recovery of monochlorohydrocarbons is difficult and results mainly in the replacement of chlorine by hydrogen in accordance with the overall equationIn some cases, dimeric compounds (R-R) are formed according to the schemeThe recovery of vinyl chlorine is difficult, and that of the allyl one is facilitated in comparison with chlorine in saturated com...

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Section: Comparative Data Of Hydrodechlorination Of Chlorohydrocarbonsmentioning

confidence: 99%

Theoretical and Applied Aspects of Hydrodechlorination Processes—Catalysts and Technologies

Flid¹,

Kartashov²,

Treger³

2020

Catalysts

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“…The carbon nanotubes (CNTs) [1] are the most interesting carbon materials opening promising technological applications in nanotechnology, biochemistry, biomedicine, catalysis, electronics, optoelectronics, electrochemistry or space industry [2][3][4]. The CNTs are the carbon allotropic form built from the rolled graphene (the single atomic graphite layer) sheets.…”

Section: Introductionmentioning

confidence: 99%

Studies of oxidized carbon nanotubes in temperature range RT–630°C by the infrared and electron spectroscopies

Stobiński

Lesiak

Zemek

et al. 2010

Journal of Alloys and Compounds

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“…On the other hand, acidity has a remarkable role in the deactivation of hydrodechlorination catalysts. The presence of acid centers in the support could accelerate the deactivation of the catalyst through the formation of carbonaceous deposits (coke) [40,41,48,51,53,60,66,[136][137][138]. The deactivation mechanism is explained in Section 6.2.…”

Section: Surface Aciditymentioning

confidence: 99%

Understanding Hydrodechlorination of Chloromethanes. Past and Future of the Technology

et al. 2020

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Chloromethanes are a group of volatile organic compounds that are harmful to the environment and human health. Abundant studies have verified that hydrodechlorination might be an effective treatment to remove these chlorinated pollutants. The most outstanding advantages of this technique are the moderate operating conditions used and the possibility of obtaining less hazardous valuable products. This review presents a global analysis of experimental and theoretical studies regarding the hydrodechlorination of chloromethanes. The catalysts used and their synthesis methods are summarized. Their physicochemical properties are analyzed in order to deeply understand their influence on the catalytic performance. Moreover, the main causes of the catalyst deactivation are explained, and prevention and regeneration methods are suggested. The reaction systems used and the effect of the operating conditions on the catalytic activity are also analyzed. Besides, the mechanisms and kinetics of the process at the atomic level are reviewed. Finally, a new perspective for the upgrading of chloromethanes, via hydrodechlorination, to valuable hydrocarbons for industry, such as light olefins, is discussed.

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Multi-Wall Carbon Nanotubes as a Support for Platinum Catalysts for the Hydrodechlorination of Carbon Tetrachloride and Dichlorodifluoromethane

Cited by 7 publications

References 37 publications

Theoretical and Applied Aspects of Hydrodechlorination Processes—Catalysts and Technologies

Theoretical and Applied Aspects of Hydrodechlorination Processes—Catalysts and Technologies

Studies of oxidized carbon nanotubes in temperature range RT–630°C by the infrared and electron spectroscopies

Understanding Hydrodechlorination of Chloromethanes. Past and Future of the Technology

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