Process intensification of honeycomb fractal micro-reactor for the direct production of lower olefins from syngas

Zhang, Xiaodan; Zhong, Liangshu; Zeng, Gaofeng; Gu, Yü; Peng, Ci; Yu, Fei; Tang, Zhiyong; Sun, Yuhan

doi:10.1016/j.cej.2018.06.078

Cited by 27 publications

(13 citation statements)

References 37 publications

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“…In contrast, as shown in Figure 5b for wall-coated microreactor, the CO conversion stabilizes around 25% after 10 h of time on stream. Table 2 compares the final stable CO conversion and products distribution in wall-coating microreactor with the performance of fixed-bed microreactor 18 displayed in our previous work, in which the inner diameter was 9 mm, and 0.5 g of catalyst was packed. It can be seen that the CO conversion and selectivity of lower olefins are lower in wall-coating microreactor, probably resulting from the lower formation of cobalt carbide nanoprisms and the exposed facets during the syngas conversion.…”

Section: Resultsmentioning

confidence: 99%

“…Previously, we have studied the Fischer–Tropsch synthesis of lower olefins (FTO) (C 2 = , C 3 = , C 4 = ) from synthesis gas in a honeycomb fractal microreactor, where cobalt carbide catalyst was packed as a fixed bed. It was observed that maximum CO conversion and high olefin yields could be achieved due to enhanced contact between reactants and catalyst particles by honeycomb fractal structure.…”

Section: Introductionmentioning

confidence: 99%

“…The direct conversion of syngas into lower olefins was utilized to evaluate the catalytic performance of fabricated microreactor. Same experimental apparatus as described in our previous work 18 was used. Here, we highlight the specific aspects under consideration.…”

Section: Introductionmentioning

confidence: 99%

“…Assuming the amount of N 2 remained constant after the reaction, internal standard method was applied to calculate the CO conversion. Here, the calculations of CO conversion and product selectivity refers to our previous work, 18 referring to the Supporting Information.…”

Section: Introductionmentioning

confidence: 99%

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Novel Cobalt Carbide Catalyst Wall-Coating Method for FeCrAlloy Microchannels Exemplified on Direct Production of Lower Olefins from Syngas

Zhang

et al. 2019

Ind. Eng. Chem. Res.

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Wall-coating is an attractive approach for immobilizing catalyst into microchannels due to potential enhancement in heat and mass transfer and a small pressure drop. A novel hybrid method was thus developed for efficiently wall-coating special cobalt carbide catalyst into FeCrAlloy microchannels on the direct production of lower olefins from syngas. The effect of pretreatment was investigated to form a uniform Al2O3 layer on the surface of FeCrAlloy substrate. The small loss of coated catalyst layer in the mechanical adherence test by exposing the FeCrAlloy substrate to a fast nitrogen flow indicated its outstanding stability in the immobilization of cobalt carbide catalyst. The coating catalyst exhibited a stable and good activity after reaching the steady state. Additionally, calculations revealed that the wall-coated and fixed-bed microreactors had comparable mass transfer factor j D, but the former provided a five times larger heat transfer factor j H and 100 times lower pressure drop per unit length, confirming in detail the advantages of wall-coating. The proposed wall-coating strategy can be applied for immobilizing other catalyst within metallic microchannels, providing a practical technical solution for industrial implementation of microreactors.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Novel Cobalt Carbide Catalyst Wall-Coating Method for FeCrAlloy Microchannels Exemplified on Direct Production of Lower Olefins from Syngas

Zhang

et al. 2019

Ind. Eng. Chem. Res.

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“…Current studies report applications of fractal geometries in the mapping of laminar flows, flow meter and distributors, ,,, microfluidic and nanofluidic devices, ribbed channels for heat transfer enhancement structures used in heat exchangers, electronic cooling equipment and internal cooling of turbine blades, enhancing porosity and permeability in porous materials, , electronic devices for energy storage and heat dissipation, and microreactors, with promising results in terms of pressure drop and flow stabilization. However, there are no studies where the fractal geometry principle has been used in fluid dynamics evaluation of tower internals.…”

Section: Introductionmentioning

confidence: 99%

Experimental Fluid Dynamics Study of a New Fractal Dual-Flow Tray

Brondani

Mayer

Hoffmann

et al. 2020

Ind. Eng. Chem. Res.

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Countercurrent flow in conventional dual-flow trays results in segregation in liquid and vapor flow, reducing tray efficiency. Therefore, a new dual-flow tray with fractal geometry was experimentally investigated. Air and water were used as vapor and liquid models. Flow regime and fluid dynamics parameters such as dry (ΔP d ) and wet (ΔP w ) tray pressure drop, froth height (H), clear liquid height (h CL ), and froth porosity (ε) were evaluated. The results showed a lower and a more stable ΔP w in the fractal tray with a smaller hole diameter compared to the conventional tray when F s ranged from 0.59 to 1.04. Fluid dynamics parameters such as H, h CL , and ε were similar between the fractal tray with a smaller hole diameter and the conventional tray for capacity factor (F s ) values from 0.68 to 1.04 and for all values of liquid flow rate (Q L ). Fractal geometry provided a more stable liquid and vapor flow through the alternating formation of high and low pressure microzones.

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Atomic‐Ordering‐Induced Modulated Properties of Zigzag ZnTe Nanotubes

Das¹,

Chowdhury

Gupta

2021

Physica Status Solidi (b)

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In this work, zigzag ZnTe nanotubes of various diameters are constructed from a ZnTe sheet and are optimized geometrically through density functional theory based energy minimization calculations. The energetically optimized nanotubes are then used to examine their electronic properties. It is found that the band gap of a nanotube may be adjusted over a wide range from 0.5 to 2.3 eV and the work function of a nanotube may be adjusted in the range from 4.7 to 5.8 eV by choosing a nanotube of appropriate diameter. Thus, zigzag ZnTe nanotube may serve as an important band gap material for technological purposes.

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Process intensification of honeycomb fractal micro-reactor for the direct production of lower olefins from syngas

Cited by 27 publications

References 37 publications

Novel Cobalt Carbide Catalyst Wall-Coating Method for FeCrAlloy Microchannels Exemplified on Direct Production of Lower Olefins from Syngas

Novel Cobalt Carbide Catalyst Wall-Coating Method for FeCrAlloy Microchannels Exemplified on Direct Production of Lower Olefins from Syngas

Experimental Fluid Dynamics Study of a New Fractal Dual-Flow Tray

Atomic‐Ordering‐Induced Modulated Properties of Zigzag ZnTe Nanotubes

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