Fischer-Tropsch waxes VII. The thermal conductivity of hard wax

Directional freeze casting enables the assembly of bimodally porous micronomolith Fischer–Tropsch catalyst bodies with enhanced effective thermal conductivity and pore molecular transport rates, leading to a high selectivity to liquid olefin products.

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Monolithic catalysts with high thermal conductivity for the Fischer–Tropsch synthesis in tubular reactors

Chemical Engineering Journal ◽

10.1016/j.cej.2011.05.014 ◽

2011 ◽

Vol 171 (3) ◽

pp. 1294-1307 ◽

Cited By ~ 69

Author(s):

Carlo Giorgio Visconti ◽

Enrico Tronconi ◽

Gianpiero Groppi ◽

Luca Lietti ◽

Massimo Iovane ◽

...

Keyword(s):

Thermal Conductivity ◽

Tropsch Synthesis ◽

High Thermal Conductivity ◽

Fischer Tropsch ◽

Fischer Tropsch Synthesis ◽

Monolithic Catalysts ◽

Tubular Reactors

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Fischer-Tropsch waxes VII. The thermal conductivity of hard wax

Journal of Applied Chemistry and Biotechnology ◽

10.1002/jctb.2720240110 ◽

2007 ◽

Vol 24 (1-2) ◽

pp. 81-91

Author(s):

Johannes H. Le Roux ◽

Roy D. F. Smith ◽

Richard Turner ◽

Onno Weidema

Keyword(s):

Thermal Conductivity ◽

Fischer Tropsch

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Thermal Assessment of a Micro Fibrous Fischer Tropsch Fixed Bed Reactor Using Computational Fluid Dynamics

Processes ◽

10.3390/pr8101213 ◽

2020 ◽

Vol 8 (10) ◽

pp. 1213

Author(s):

Aya E. Abusrafa ◽

Mohamed S. Challiwala ◽

Benjamin A. Wilhite ◽

Nimir O. Elbashir

Keyword(s):

Fluid Dynamics ◽

Thermal Conductivity ◽

Computational Fluid Dynamics ◽

Scale Up ◽

High Thermal Conductivity ◽

Packed Bed Reactor ◽

Fixed Bed Reactor ◽

Internal Diameter ◽

Fischer Tropsch ◽

Co Conversion

A two-dimensional (2D) Computational Fluid Dynamics (CFD) scale-up model of the Fischer Tropsch reactor was developed to thermally compare the Microfibrous-Entrapped-Cobalt-Catalyst (MFECC) and the conventional Packed Bed Reactor (PBR). The model implements an advanced predictive detailed kinetic model to study the effect of a thermal runaway on C5+ hydrocarbon product selectivity. Results demonstrate the superior capability of the MFECC bed in mitigating hotspot formation due to its ultra-high thermal conductivity. Furthermore, a process intensification study for radial scale-up of the reactor bed from 15 mm internal diameter (ID) to 102 mm ID demonstrated that large tube diameters in PBR lead to temperature runaway >200 K corresponding to >90% CO conversion at 100% methane selectivity, which is highly undesirable. While the MFECC bed hotspot temperature corresponded to <10 K at >30% CO conversion, attributing to significantly high thermal conductivity of the MFECC bed. Moreover, a noticeable improvement in C5+ hydrocarbon selectivity >70% was observed in the MFECC bed in contrast to a significantly low number for the PBR (<5%).

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