Thin-zone TAP-reactor – theory and application

Shekhtman, Sergiy O.; Yablonsky, Grigoriy; Chen, S.; Gleaves, John

doi:10.1016/s0009-2509(98)00534-x

Cited by 123 publications

(81 citation statements)

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“…Local temperature spikes are insignificant due to the very dilute oxygenate mixtures and the presence of fewer molecules in comparison with the thermal mass of the bed. In the absence of reaction, the thin-zone configuration of the TAP reactor allows for decoupling of diffusion from desorption with or without re-adsorption and eliminates the concentration gradients along the bed [46]. In the TPD profiles obtained, intra-particle diffusion does not limit the desorption/re-adsorption process according to the criteria given in Refs [43,45,47].…”

Section: Limiting Factorsmentioning

confidence: 99%

Mechanistic Insights into the Desorption of Methanol and Dimethyl Ether Over ZSM-5 Catalysts

et al. 2017

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The desorption of methanol and dimethyl ether has been studied over fresh and hydrocarbon-occluded ZSM-5 catalysts with Si/Al ratios of 25, 36 and 135 using a temporal analysis of products reactor. The catalysts were characterized by XRD, SEM, N 2 physisorption and pyridine FT-IR. The crystal size increases with Si/Al ratio from 0.10 to 0.78 µm. The kinetic parameters were obtained using the Redhead method and a plug flow reactor model with coupled convection, adsorption and desorption steps. ZSM-5 catalysts with Si/Al ratios of 25 and 36 exhibit three adsorption sites (low, medium, and high temperature sites), while there is no difference between medium and high temperature sites at a Si/Al ratio of 135. Molecular adsorption on the low temperature site and dissociative adsorption on the medium and high temperature sites give a good match between experiment and the plug flow reactor model. The DME desorption activation energy was systematically higher than that of methanol. Adsorption stoichiometry shows that methanol and DME form clusters onto the binding sites. When non-activated re-adsorption is accounted for, a local equilibrium is reached only on the low and medium temperature binding sites. No differences were observed, other than in site densities, when extracting the kinetic parameters for fresh and activated ZSM-5 catalysts at full coverage. Graphical AbstractElectronic supplementary material The online version of this article (https://doi

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Section: Limiting Factorsmentioning

confidence: 99%

Mechanistic Insights into the Desorption of Methanol and Dimethyl Ether Over ZSM-5 Catalysts

et al. 2017

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“…In all experiments, the thin zone TAP reactor (TZTR) concept (Shekhtman et al, 1999a) was used. Both intensity and shape of such curve can be analysed using moments, which are integrals of the observed TAP pulse responses weighted with a different power of time, as illustrated in Equation (1).…”

Section: Tapmentioning

confidence: 99%

“…The second moment, M 2 , gives access to the apparent time delay, τ app , which corresponds to the residence time of the molecule inside the porous network. The detailed mathematical description of the analytical method has been reported elsewhere (Shekhtman et al, 1999a(Shekhtman et al, , 1999bShekhtman 2003).…”

Section: Tapmentioning

confidence: 99%

Using temporal analysis of products and flux response technology to determine diffusion coefficients in catalytic monoliths

Maguire

Sasegbon

Abdelkader

et al. 2013

Chemical Engineering Science

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“…Unsteady kinetic characterization of catalytic devices is often made through pulse-response methods such as Temporal Analysis of Products (TAP) methods [49][50][51][52] and Unsteady-State Processes in Catalysis (USPC) [53]. These techniques typically apply to high-vacuum conditions, where the molecular mean free path is significant compared to the characteristic size of the device.…”

Section: Heterogeneous Catalysis In Pulsed-flow Reactorsmentioning

confidence: 99%

Simulating Engineering Flows through Complex Porous Media via the Lattice Boltzmann Method

Krastev

Falcucci

2018

Energies

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Abstract:In this paper, recent achievements in the application of the lattice Boltzmann method (LBM) to complex fluid flows are reported. More specifically, we focus on flows through reactive porous media, such as the flow through the substrate of a selective catalytic reactor (SCR) for the reduction of gaseous pollutants in the automotive field; pulsed-flow analysis through heterogeneous catalyst architectures; and transport and electro-chemical phenomena in microbial fuel cells (MFC) for novel waste-to-energy applications. To the authors' knowledge, this is the first known application of LBM modeling to the study of MFCs, which represents by itself a highly innovative and challenging research area. The results discussed here essentially confirm the capabilities of the LBM approach as a flexible and accurate computational tool for the simulation of complex multi-physics phenomena of scientific and technological interest, across physical scales.

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Thin-zone TAP-reactor – theory and application

Cited by 123 publications

References 0 publications

Mechanistic Insights into the Desorption of Methanol and Dimethyl Ether Over ZSM-5 Catalysts

Mechanistic Insights into the Desorption of Methanol and Dimethyl Ether Over ZSM-5 Catalysts

Using temporal analysis of products and flux response technology to determine diffusion coefficients in catalytic monoliths

Simulating Engineering Flows through Complex Porous Media via the Lattice Boltzmann Method

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