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Direktor, L. B.; Зайченко, В. М.; Maikov, I. L.; Sokol, G. F.; Shekhter, Yu. L.; Shpilʹraĭn, Ė. Ė.

doi:10.1023/a:1004178732334

Cited by 5 publications

(3 citation statements)

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“…In the case of methane pyrolysis under conditions of filtering through a porous or granular medium, pyrocarbon is deposited in the pores of the granules and on their surface, and soot is formed in the free space between granules. 27 SEM images of the SiC granules (SA BET < 0.1 m 2 /g) confirmed that the particles were covered with filamentous carbon (Figure 12c). SEM/EDS analyses of sections of the interior cup reactor walls (Figure 1) were performed to determine the structure and composition of the carbon formed during the pyrolysis reaction.…”

Section: Resultsmentioning

confidence: 79%

“…In the pyrolysis of methane, two forms of carbon are generated, namely, finely divided carbon (soot) (Figure a,d), and pyrocarbon (Figure b) as solid carbon deposits as a result of surface reactions. , Pyrocarbon was found to cover the entire heated section of the reactor, irrespective of the heat transfer media used in the pyrolysis experiments. In the case of methane pyrolysis under conditions of filtering through a porous or granular medium, pyrocarbon is deposited in the pores of the granules and on their surface, and soot is formed in the free space between granules . SEM images of the SiC granules (SA BET < 0.1 m 2 /g) confirmed that the particles were covered with filamentous carbon (Figure c).…”

Section: Resultsmentioning

confidence: 90%

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Hydrogen Production by Direct Contact Pyrolysis of Natural Gas

et al. 2003

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In this paper, we propose the concept of utilizing the heat generated in Generation IV nuclear reactors to produce hydrogen and carbon from methane or natural gas by direct contact pyrolysis, a process that features zero greenhouse gas emissions. Methane or natural gas was bubbled through a bed of either low-melting-point metals (e.g., lead or tin), granular or catalytic materials (e.g., silicon carbide, α-alumina, NiMo/γ-alumina), or a mechanical mixture of molten metal and solid media. The methane conversions were found to be dependent upon the contact time between the methane and the heat transfer media, as well as on the methane bubble size. The most efficient systems used for the pyrolysis process were found to be the ones in which natural gas was bubbled through Mott porous metal filters, in a bed of either 4-in. Sn + SiC or Sn, with the product stream comprised of almost 80 and 70 vol % of hydrogen at 750 °C, respectively. The main advantage of this proposed system is the ease of buoyant separation of the generated carbon byproduct from the liquid heat transfer media. These experiments lay the groundwork for developing technical expertise in producing pure hydrogen cost-effectively by utilizing the heat energy contained in the liquid metal coolant in Generation IV nuclear reactors.

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Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 90%

Hydrogen Production by Direct Contact Pyrolysis of Natural Gas

et al. 2003

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“…Along with the processes of combustion and gasification (disintegration of the porous skeleton), the inverse processes (pore filling) such as methane pyrolysis during filtering through a porous medium are of great interest. The problem of methane pyrolysis was treated in [12][13][14] in view of the monodispersity of porous medium; the dependence of variation of the inner reaction surface on the degree of metamorphism of the porous skeleton for a monodisperse system of particles was obtained using the model of random spheres of [1].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Process of Methane Pyrolysis in Polydisperse Porous Medium

Maikov

Зайченко

2017

Eurasian Chem. Tech. J.

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The paper deals with the results of theoretical investigation of the process of methane pyrolysis an a polydisperse medium. A separate porous particle (macroparticle) is treated and this particle consists of different microparticles, which intersect randomly. A kinetic equation is used to describe the dynamics of a polydisperse system of microparticles in the process of methane pyrolysis. The reaction rate on the reaction surface of the particle is of the order of n with respect to the gas reactant. The reactant is delivered to the porous macroparticle via external diffusion layer outside of the particle and internal diffusion layer in the particle pores. A generalization of the expression for porosity for a polydisperse medium is made. Comparison is made of the times required for filling the pores for different initial size distributions of particles. A general analytical expression is derived describing the dependence of variation of the inner reaction surface on the degree of metamorphism of the porous skeleton for an arbitrary initial size distribution of particles. Comparison is made of the dependences of the degree of metamorphism of porous skeleton on dimensionless time for different initial distributions, namely, monodisperse, uniform, and normally<br />logarithmic with varying dispersion. It has been demonstrated that a polydisperse medium may be described by an effective structure parameter.

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Mathematical model of chemical reactions in polydisperse porous media

Maikov

2007

International Journal of Heat and Mass Transfer

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Cited by 5 publications

References 1 publication

Hydrogen Production by Direct Contact Pyrolysis of Natural Gas

Hydrogen Production by Direct Contact Pyrolysis of Natural Gas

Analysis of the Process of Methane Pyrolysis in Polydisperse Porous Medium

Mathematical model of chemical reactions in polydisperse porous media

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