Low-Temperature WGS Reaction

Reddy, Gunugunuri K.; Smirniotis, Panagiotis G.

doi:10.1016/b978-0-12-420154-5.00003-6

Cited by 7 publications

(4 citation statements)

References 145 publications

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“…Hydrogen production is the largest use of syngas, with steam methane reforming (SMR) being the predominant technology, which is a well-established process with two main reactions, reforming and water gas shift reaction [ 3 , 4 ]. In order to use the hydrogen obtained by this method, an extra purification step is necessary.…”

Section: Introductionmentioning

confidence: 99%

Gas Separation Properties of Polyimide Thin Films on Ceramic Supports for High Temperature Applications

et al. 2018

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Novel selective ceramic-supported thin polyimide films produced in a single dip coating step are proposed for membrane applications at elevated temperatures. Layers of the polyimides P84®, Matrimid 5218®, and 6FDA-6FpDA were successfully deposited onto porous alumina supports. In order to tackle the poor compatibility between ceramic support and polymer, and to get defect-free thin films, the effect of the viscosity of the polymer solution was studied, giving the entanglement concentration (C*) for each polymer. The C* values were 3.09 wt. % for the 6FDA-6FpDA, 3.52 wt. % for Matrimid®, and 4.30 wt. % for P84®. A minimum polymer solution concentration necessary for defect-free film formation was found for each polymer, with the inverse order to the intrinsic viscosities (P84® ≥ Matrimid® >> 6FDA-6FpDA). The effect of the temperature on the permeance of prepared membranes was studied for H2, CH4, N2, O2, and CO2. As expected, activation energy of permeance for hydrogen was higher than for CO2, resulting in H2/CO2 selectivity increase with temperature. More densely packed polymers lead to materials that are more selective at elevated temperatures.

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Section: Introductionmentioning

confidence: 99%

Gas Separation Properties of Polyimide Thin Films on Ceramic Supports for High Temperature Applications

et al. 2018

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“…This complex metal affects reaction stability, as seen in CZA-531 and CZA-631. The conversion is also affected by the Zn content, which in this case is determined by the ratio of Cu/Zn (Reddy & Smirniotis 2015). The Cu/Zn ratios for 1.18,1.51,and 1.91, respectively.…”

Section: Wgsr On Cza Catalystsmentioning

confidence: 99%

Effects of CaO addition into CuO/ZnO/Al2O3 catalyst on hydrogen production through water gas shift reaction

Hastuti,

Rosyadi,

Anindita

et al. 2024

Int. J. Renew. Energy Dev.

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Hydrogen is a promising renewable energy carrier and eco-friendly alternative to fossil fuels. Water-gas-shift reaction (WGSR) is commonly used to generate hydrogen from renewable biomass feedstocks. Enriching hydrogen content in synthesis gas (syngas) production can be made possible by applying the WGSR after gasification. WGSR can achieve a maximal carbon monoxide (CO) conversion using a commercially patented CZA (Cu/ZnO/Al2O3) catalyst. This study proposed three in-lab self-synthesized CZA catalysts to be evaluated and compared with the patented catalyst performance-wise. The three catalysts were prepared with co-precipitation of different Cu:Zn:Al molar ratios: CZA-431 (4:3:1), CZA-531 (5:3:1) and CZA-631 (6:3:1). The catalysts characteristics were determined through X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) analysis and Scanning Electron Microscopy (SEM) techniques. CO gas was mixed with steam in a catalytic reactor with a 3:1 molar ratio, running continuously through the catalyst at 250 °C for 30 mins. All three catalysts, however, performed below expectations, where CZA-431 had a CO conversion of 77.44%, CZA-531 48.75%, and CZA-631 71.67%. CaO, as a co-catalyst, improved the performance by stabilizing the gas composition faster. The CO conversion of each catalyst also improved: CZA-431 improved its CO conversion to 97.39%, CZA-531 to 96.71%, and CZA-631 to 95.41%. The downward trend of the CO conversion was deemed to be caused by copper content found in CZA-531 and CZA-631 but not in CZA-431, which tended to form a Cu-Zn metal complex, weakening the catalyst's activity.

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“…Noble metals can also be used as catalysts for reaction (1), although Pt is rather low in activity, due to the formation of a passivating surface layer of oxide, at these low temperatures. In contrast, and perhaps not surprisingly, under these same conditions, Au is the most active of the noble metals, and much more active than the traditional Cu/ZnO catalyst noted above, especially when deposited on a TiO2 support [6]. Although a Au/TiO2 catalyst for reaction (1) deactivates over time, its activity can be readily restored by flowing air over the catalyst at elevated temperatures [6].…”

Section: Introductionmentioning

confidence: 95%

Catalytic and photocatalytic water gas shift reaction (WGSR) using a continuous flow, gas phase reactor

Bingham

Mills

2021

Journal of Photochemistry and Photobiology A: Chemistry

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Low-Temperature WGS Reaction

Cited by 7 publications

References 145 publications

Gas Separation Properties of Polyimide Thin Films on Ceramic Supports for High Temperature Applications

Gas Separation Properties of Polyimide Thin Films on Ceramic Supports for High Temperature Applications

Effects of CaO addition into CuO/ZnO/Al2O3 catalyst on hydrogen production through water gas shift reaction

Catalytic and photocatalytic water gas shift reaction (WGSR) using a continuous flow, gas phase reactor

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