Catalytic steam reforming of methane, methanol, and ethanol over Ni/YSZ: The possible use of these fuels in internal reforming SOFC

Laosiripojana, Navadol; Assabumrungrat, Suttichai

doi:10.1016/j.jpowsour.2006.10.006

Cited by 280 publications

(142 citation statements)

References 22 publications

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“…Because the SOFC is fed by air, the partial pressure of the oxygen in the cell has been assumed constant at P O2 = 21270Pa, as this is the partial pressure of oxygen in air. The partial pressure of the carbon dioxide product, P CO2 = 31900, is taken from the experimental work of Laosiripojana and Assabumrungrat (2007).…”

Section: -7mentioning

confidence: 99%

A Novel SOFC Tri-generation System for Building Applications

Elmer

2017

Springer Theses

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i AbstractIn response to the critical need to decarbonise the built environment, alternative methods for more effective energy utilisation need to be explored including trigeneration systems.Tri-generation is the simultaneous generation of electricity, heating and/or cooling from a single fuel source. Solid oxide fuel cell (SOFC) and liquid desiccant demonstrate many characteristics that make them an attractive option in the development of an efficient and effective tri-generation system. SOFCs have high operational electrical efficiencies and a thermal output in good agreement with the low temperature regeneration requirement of liquid desiccants.The aim of this thesis is to design, develop and test an efficient and effective proof of concept tri-generation system based on SOFC and liquid desiccant air conditioning technology for building applications. An extensive review of the literature shows that no previous work has been reported on such a system. The research has critically examined, both theoretically and experimentally, the novel tri-generation system concept.Simulations show tri-generation system efficiencies of up to 71% are achievable at a 1.5kW e capacity, which are encouraging values for a system of this size. An integration analysis, based on empirical data, provides good agreement with the simulations. At a 1.5kW e output, a tri-generation efficiency of 69% has been demonstrated. The inclusion of liquid desiccant air conditioning provides an efficiency increase of up to 15% compared to SOFC electrical operation only, demonstrating the merit of the novel tri-generation system in applications that require simultaneous electrical power, heating and dehumidification/cooling. An experimental system, using a micro-tubular SOFC shows the novel system can generate 150W of electrical power, 443W of heat or 279W of cooling. Instantaneous tri-generation system efficiency is low at around 25%. This is primarily due to the low capacity and poor performance of the micro-tubular SOFC. Although the performance is low, the experimental results demonstrate regeneration of a potassium formate desiccant solution using the thermal output from the microtubular SOFC in the first of its kind tri-generation system. The thesis has established that a clear operational advantage of the novel SOFC liquid desiccant Abstract f ii tri-generation system is the potential for nonsynchronous operation. The constant SOFC thermal output can be used to re-concentrate the desiccant solution as a form of thermal energy storage. Unlike thermal storage techniques based on sensible energy, a significant advantage of (chemical) thermal energy storage in the form of strong desiccant solution is that there are minimal losses over time.Using this nonsynchronous operating concept, the experimental system can generate an increased peak cooling output of up to 527W and a daily tri-generation efficiency of 38%.An economic assessment demonstrates questionable performance; however this is anticipated to improve with SOFC capital cost reduct...

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Section: -7mentioning

confidence: 99%

A Novel SOFC Tri-generation System for Building Applications

Elmer

2017

Springer Theses

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“…Refinement, indexing and the simulation of the structure was done with Rietveld method and GSAS software respectively, which allowed to evaluate the chemical composition and crystallographic structure of the perovskite. The crystallite size was calculated using the highest diffraction 6 signals and the Debye-Scherrer equation, taking the value of half peak width set by a Lorentzian function and using a constant of 0.89 as reference.…”

Section: Characterization Of Oxidementioning

confidence: 99%

One-step hydrothermal synthesis of LaFeO3 perovskite for methane steam reforming

Cuaspud

López

Castelló

et al. 2016

Reac Kinet Mech Cat

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This work describes the synthesis of LaFeO 3 oxide, using a one-step hydrothermal synthesis route, to obtain a solid exhibiting superficial, morphological and textural properties useful for potential applications. The synthesis process starts from corresponding metal nitrates of lanthanum and iron in well-defined concentration and KOH as mineralizing agent. The reaction is developed in a Teflon-lined stainless steel autoclave at 300 °C for 14 days. The composition and surface area were determined with X-ray fluorescence (XRF) and nitrogen adsorption isotherms (BET), verifying the obtaining of a stoichiometric, high, and active phase of oxide. The crystalline structure was evaluated with X-ray diffraction analysis (XRD), showing a pure orthorhombic perovskite phase. TPR results show the development of three single steps at different temperatures, kinetically detectable and related with reduction of component oxides. Scanning and transmission electron microscopy (SEM-TEM) results showed a remarkable degree of crystallization, favouring a specific morphology as a result of the low consolidation temperature of the perovskite phase. Catalytic test by means of methane reaction, performed along 240 on stream, reveals a light deactivation rate, decreasing progressively 7.1% until 60% of methane conversion, indicating the improved morphological and surface characteristics for potential applications.

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“…Formation of C-C bond, known as coking, deactivates the Ni/YSZ anode catalyst through the loss of active sites and microstructural damage [23,24]. A number of approaches were investigated to suppress the coking and delay the anode deactivation including the addition of steam [25], dilution of hydrocarbon fuel with CO 2 [26,27] …”

Section: Open Accessmentioning

confidence: 99%

La0.6Sr0.4Co0.2Fe0.8O3 Perovskite: A Stable Anode Catalyst for Direct Methane Solid Oxide Fuel Cells

Mirzababaei

Chuang

2014

Catalysts

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Direct methane solid oxide fuel cells, operated by supplying methane to a Ni/YSZ anode, suffer from degradation via accumulation of carbon deposits on the Ni surface. Coating a 40 µm thin film of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 (LSCF) perovskite on the Ni/YSZ anode surface decreased the amount of carbon deposits, slowing down the degradation rate. The improvement in anode durability could be related to the oxidation activity of LSCF which facilitates oxidation of CH 4 and carbon deposits. Analysis of the crystalline structure of LSCF revealed that LSCF was stable in the reducing anode environment under H 2 and CH 4 flow at 750 °C and retained its perovskite structure throughout the 475 h long-term stability test.

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Catalytic steam reforming of methane, methanol, and ethanol over Ni/YSZ: The possible use of these fuels in internal reforming SOFC

Cited by 280 publications

References 22 publications

A Novel SOFC Tri-generation System for Building Applications

A Novel SOFC Tri-generation System for Building Applications

One-step hydrothermal synthesis of LaFeO3 perovskite for methane steam reforming

La0.6Sr0.4Co0.2Fe0.8O3 Perovskite: A Stable Anode Catalyst for Direct Methane Solid Oxide Fuel Cells

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