Kinetics and mechanism of catalytic carbon gasification

Lobo, L.S.; Carabineiro, Sónia A. C.

doi:10.1016/j.fuel.2016.06.115

Cited by 66 publications

(23 citation statements)

References 93 publications

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“…For the carbon gasification at the external surface, the carbon must be firstly dissolved in the catalyst particle at the internal surface. As a result, a “sintering‐like” faceting of the catalyst particles is requested to provide active contact with solid carbon . In this case, the Tammann temperature at which lattices start to move noticeably is served as an important physical parameter to evaluate the catalytic activity of metal catalysts toward the Boudouard reaction.…”

Section: Resultsmentioning

confidence: 99%

“…As a result, a "sintering-like" faceting of the catalyst particles is requested to provide active contact with solid carbon. [46] In this case, the Tammann temperature at which lattices start to move noticeably is served as an important physical parameter to evaluate the catalytic activity of metal catalysts toward the Boudouard reaction. Fortunately, the low Tammann temperatures of BaCO 3 (730 C) [47] and Fe oxides (e.g., Fe 2 O 3 , 783 C; Fe 3 O 4 , 799 C) [48] imply that Fe and Ba should have good catalytic activity toward the Boudouard reaction.…”

Section: Electrochemical Performance Of the Dc-sofcsmentioning

confidence: 99%

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Enhancing the Power Output of Direct Carbon Solid Oxide Fuel Cell Using Ba‐Loaded Activated Carbon Fuel

Tang

Wang

et al. 2019

Energy Tech

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The performance of direct carbon solid oxide fuel cells (DC‐SOFCs) is limited by the slow carbon gasification kinetics at operating temperatures. To address this limitation, a carbon fuel loaded with Ba catalyst is developed for DC‐SOFCs to improve the electrochemical performance in this study. Ba is loaded on activated carbon in the form of BaCO3 by the wet agglomeration technique. The effect of the Ba catalyst with various contents on the electrochemical performance in single cells and fuel utilization of DC‐SOFCs are examined. Experimental results show that the optimized Ba content is 5 wt% and the DC‐SOFC with this Ba‐loaded activated carbon fuel gives the best output with a maximum power density of 328.4 mW cm−2 at 850 °C. Furthermore, the DC‐SOFC fueled by 5 wt% Ba‐loaded activated carbon operates steadily for 28.76 h with the fuel utilization of 16.0%, which is also superior to many other cells. The enhancement of cell performance suggests that Ba is an effective catalyst to the Boudouard reaction, and the catalytic mechanism is also discussed in detail.

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Section: Resultsmentioning

confidence: 99%

Section: Electrochemical Performance Of the Dc-sofcsmentioning

confidence: 99%

Enhancing the Power Output of Direct Carbon Solid Oxide Fuel Cell Using Ba‐Loaded Activated Carbon Fuel

Tang

Wang

et al. 2019

Energy Tech

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“…It indicates that the as‐mentioned metal elements might mainly exist in the form of metal oxides or carbonates. Noted that K, Mg, and Fe elements are also excellent Boudouard reaction catalysts . The elements may be beneficial to the cell performance of a DC‐SOFC operated on wheat straw char as fuel.…”

Section: Resultsmentioning

confidence: 99%

“…To solubilize carbon atoms, a catalyst particle must have active contact with carbon atoms. To have active contact, there must be a so‐called “sintering‐like” faceting of the catalyst particle . Accordingly, Tammann temperature, at which lattices begin to be appreciably mobile, is applied to evaluate the catalytic activity of a metal oxide on the carbon gasification reaction.…”

Section: Resultsmentioning

confidence: 99%

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A direct carbon solid oxide fuel cell fueled with char from wheat straw

Cai

Liu

et al. 2018

Int J Energy Res

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Summary Direct carbon solid oxide fuel cell (DC‐SOFC) is a promising technology for electricity generation from biomass with high conversion efficiency and low pollution. Biochar derived from wheat straw is utilized as the fuel of a DC‐SOFC, with cermet of silver and gadolinium‐doped ceria as the material of both cathode and anode and yttrium stabilized zirconia as electrolyte. The output performance of a DC‐SOFC operated on pure wheat straw is 197 mW cm−2 at 800°C and increases to 258 mW cm−2 when 5% of Ca, as a catalyst of the Boudouard reaction, is loaded on the wheat straw char. Higher power and fuel conversion utilization are achieved by using Ca as the Boudouard reaction catalyst. X‐ray diffraction, scanning electron microscopy, energy‐dispersive spectrometer, and programmed‐temperature gravimetric experiment are applied to characterize the leaf char. It turns out that the wheat straw char is with porous structure and composed of C, K, Mg, Cl, Fe, and Ca elements. The effects of the Ca catalyst on the Boudouard reaction, the performance of the DC‐SOFCs operated on the wheat straw char, and the economic advantages of the wheat straw char are demonstrated and analyzed in detail.

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