Novel catalyst structures with enhanced heat transfer characteristics

Sheng, Min; Yang, Huihua; Cahela, Donald R.; Tatarchuk, Bruce J.

doi:10.1016/j.jcat.2011.05.006

Cited by 100 publications

(70 citation statements)

References 27 publications

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“…where (9) The resulting values were compared with those estimated from thermal parameters experimentally determined (Sheng et al, 2011), shown in Fig. 16 shown in Fig.…”

Section: Simulations Conducted In Flowing Gas Environmentsmentioning

confidence: 99%

“…It can be made of highly conductive metal fibers to satisfy heat transfer requirements. The highly effective thermal conductivity of metal MFEC has been determined by our experimental measurements (Sheng et al, 2011), but a full understanding of the function of the metal fibers on improving heat transfer behavior is needed. The CFD model has already been used to study pressure drop and mass transfer behavior of MFEC structures.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Micro Scale Heat Transfer Comparison between Packed Beds and Microfibrous Entrapped Catalysts

Sheng

Gonzalez

Yantz

et al. 2013

Engineering Applications of Computational Fluid Mechanics

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Computational Fluid Dynamics (CFD) was used to compare the micro scale heat transfer inside a packed bed and a microfibrous entrapped catalyst (MFEC) structure. Simulations conducted in stagnant gas determined the thermal resistance of the gas in the micro gaps between the particle-to-particle contact points in the resistance network model of a packed bed. Tube to particle diameter ratios for the simulations were 9 based on particle diameter and 27 for MFEC based on surface area average diameter. The maximum temperature difference used in the simulations was 80°C. It was shown that thermal resistance at the contact points accounted for 90% of the thermal resistance of the solid path. In the MFEC, the thermal resistance of the continuous metal fibers was relatively smaller than that of contact points. As a result, 97.2% of the total heat flux was transported by continuous fiber cylinders, which was the fundamental function of fibers on improving the heat transfer of MFEC structures. Enhanced heat transfer characteristics of MFEC were further demonstrated by simulations performed in flowing gas, where both heat conduction and heat convection were significant.

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“…where (9) The resulting values were compared with those estimated from thermal parameters experimentally determined (Sheng et al, 2011), shown in Fig. 16 shown in Fig.…”

Section: Simulations Conducted In Flowing Gas Environmentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Micro Scale Heat Transfer Comparison between Packed Beds and Microfibrous Entrapped Catalysts

Sheng

Gonzalez

Yantz

et al. 2013

Engineering Applications of Computational Fluid Mechanics

Self Cite

View full text Add to dashboard Cite

show abstract

“…The recent research studies on the mixed reforming process have been mainly focused on catalyst performance studies [38][39][40][41]. Active metals, including noble metals [42][43][44][45][46] and transition metals [47][48][49][50][51][52][53], could be used to prepare catalyst for mixed reforming.…”

Section: Hydrogen Production With Mixed Reformingmentioning

confidence: 99%

Pure Hydrogen Production in Membrane Reactor with Mixed Reforming Reaction by Utilizing Waste Gas: A Case Study

et al. 2016

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A rise in CO2 and other greenhouse gases’ concentration from gas refinery flares and furnaces in the atmosphere causes environmental problems. In this work, a new process was designed to use waste gas (flue gas and flare gas) of a domestic gas refinery to produce pure hydrogen in a membrane reactor. In particular, the process foresees that the energy and CO2 content of flue gas can provide the heat of the mixed reforming reaction to convert flare gas into hydrogen. Furthermore, the characteristics of the feed stream were obtained via simulation. Then, an experimental setup was built up to investigate the performance of a membrane reactor allocating an unsupported dense Pd-Ag membrane at the mentioned conditions. In this regard, a Ni/CeO2 catalyst was loaded in the membrane reformer for mixed reforming reaction, operating at 450 °C, in a pressure range between 100 and 350 kPa and a gas hourly space velocity of around 1000 h−1. The experimental results in terms of methane conversion, hydrogen recovery and yield, as well as products’ compositions are reported. The best results of this work were observed at 350 kPa, where the MR was able to achieve about 64%, 52% and 50% for methane conversion, hydrogen yield and recovery, respectively. Furthermore, with the assistance of the experimental tests, the proposed process was simulated in the scaling up to calculate the needed surface area for MR in the domestic gas refinery.

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“…Among them, those made of metallic materials deserve special attention due to their advantages when used in very exothermic reactions [2][3][4][5][6][7][8][9][10][11]. In particular, wire mesh structures represent a versatile system that can adopt different geometries [12] making them applicable to several industrial and environmental processes.…”

Section: Introductionmentioning

confidence: 99%

Stacked Wire Mesh Monoliths for the Simultaneous Abatement of VOCs and Diesel Soot

et al. 2018

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Structured catalysts based on Pt,CeO 2 deposited on stainless steel wire meshes were developed to build catalytic cartridges for the treatment of diesel exhaust gases. The cartridges were tested for the simultaneous combustion of volatile organic compounds (VOCs) and soot. To this end, n-hexane, acetyl acetate, and toluene were selected as probe molecules. Each of them were loaded together with real soot into the cartridges showing that while VOCs abatement takes place between 200 • C and 350 • C, soot combustion occurs in the 300-500 • C temperature range with an average maximum combustion rate at 420 • C. The catalytic cartridges were characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and Brunauer-Emmett-Teller (BET) techniques. The mechanical stability of the coatings was confirmed by the ultrasound method. Air permeability of the cartridges prepared with different mesh sizes was also measured and the results were correlated using the Payri equation.

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Novel catalyst structures with enhanced heat transfer characteristics

Cited by 100 publications

References 27 publications

Micro Scale Heat Transfer Comparison between Packed Beds and Microfibrous Entrapped Catalysts

Micro Scale Heat Transfer Comparison between Packed Beds and Microfibrous Entrapped Catalysts

Pure Hydrogen Production in Membrane Reactor with Mixed Reforming Reaction by Utilizing Waste Gas: A Case Study

Stacked Wire Mesh Monoliths for the Simultaneous Abatement of VOCs and Diesel Soot

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