scholarly journals ΜΕΛΕΤΗ ΗΛΕΚΤΡΟΚΑΤΑΛΥΤΙΚΩΝ ΚΑΙ ΚΑΤΑΛΥΤΙΚΩΝ ΑΝΤΙΔΡΑΣΕΩΝ ΣΕ ΚΕΛΛΙΑ ΚΑΥΣΗΣ ΚΑΙ ΑΝΤΙΔΡΑΣΤΗΡΕΣ ΤΡΙΩΝ ΦΑΣΕΩΝ

1993 ◽  
Author(s):  
Απόστολος Ιωαννίδης
Keyword(s):  
Fuel Cell ◽  
Fixed Bed ◽  
Porous Metal ◽  
Life Time ◽  
Metal Catalyst ◽  
Volatile Components ◽  
Cyclic Voltametry ◽  
Liquid Phases ◽  
Cell Life ◽  
C2h4 Oxidation

THE OXIDATION OF NH3 TO NO WAS INVESTIGATED IN THE FUEL CELL NH3, NO, N2, PT OR PT-10%RHIIZRO2(8%Y2O3)IIPT OR PT-10%RH, AIR AT TEMPERATURES BETWEEN 950- 1300 K, AND ATMOSPERIC PRESSURE. THE NEW FUEL CELL DESIGN WITH THINER ELECTROLYTE AND MODIFIED ELECTRODE PREPERATION RESULTS SELECTIVITY UP TO 95% AND AN INCREASE TO POWER DENCITY AND FUEL CELL LIFE TIME BY 400, 3500% RESPECTIVELY. BASED ON PHYSICOCHEMICAL CONSEPTS, A MATHEMATICAL MODEL IS DEVELOPED TOPREDICT FUEL CELL CHARACTERISTICS. USING SIMILAR SOLID OXIDE CELLS, THE TECHNIQUE OF CYCLIC VOLTAMETRY HAS BEEN APPLIED FOR THE FIRST TIME IN CONJUCTION WITH MASS SPECTROMETRY AND ONLINE GAS CHROMATOGRAPHY TO INVESTIGATE THE CHEMISORPTIVE AND CATALYTIC PROPERTIES OF POROUS METAL CATALYST FILMS. THE CASE OF O2 ADSORPTION AND C2H4 OXIDATION ON PT WERE EXAMINED. IT WAS FOUND THAT CYCLIC VOLTAMETRY CAUSES A CYCLIC VARIATION IN CATALYST WORK FUNCTION ANDPROVIDES USEFUL IN SITU INFORMATIONS ABOUT COVERAGES OF ABSORBED SPECIES AND ABOUT THE OCCURANCE OF NEMCA EFFECT. FIXED BED CATALYTIC REACTOR IN WHICH GAW AND LIQUID PHASES FLOW CONCURENTLY DOWNWARD, TERMED AS TRICKLE BEDS, AREBECOMING WIDELY USED IN CHEMICAL PROCESSING, PARTICURALY IN PETROCHEMICAL INDUSTRY. A TWO DIMENSIONAL STEADY STATE MODEL IS DEVELOPED TO DESCRIBE THE REACTIONS BETWEEN ONE GASEOUS AND TWO NON-VOLATILE COMPONENTS IN AN ISOTHERMAL PARTIALLY WETTED CATALYTIC PELLET WITH UNIFORM OR NON-UNIFORM CATALYST MATERIAL. (TRUNCATED ABSTRACT)

Estimation of Fuel Cell Life Time Using Latent Variables in Regression Context

2009 ◽  
Author(s):  
Raïssa Onanena ◽  
Faicel Chamroukhi ◽  
Latifa Oukhellou ◽  
Denis Candusso ◽  
Patrice Aknin ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Latent Variables ◽  
Life Time ◽  
Cell Life

Electrode catalysts behavior during direct ethanol fuel cell life-time test

2005 ◽  
Vol 7 (7) ◽  
pp. 663-668 ◽  
Author(s):  
Luhua Jiang ◽  
Gongquan Sun ◽  
Suli Wang ◽  
Guoxiong Wang ◽  
Qin Xin ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Life Time ◽  
Ethanol Fuel ◽  
Direct Ethanol Fuel Cell ◽  
Cell Life ◽  
Time Test

Sintering of NiO/YSZ Anode Layers for Metal-Supported Solid Oxide Fuel Cell

2014 ◽  
Vol 1040 ◽  
pp. 155-160
Author(s):  
Andrey A. Solovyev ◽  
Igor V. Ionov ◽  
Anastasya N. Kovalchuk ◽  
Aleksandr I. Kirdyashkin ◽  
Anatoly Maznoy ◽  
...  
Keyword(s):  
High Temperature ◽  
Fuel Cell ◽  
Porous Metal ◽  
Current Collector ◽  
Inert Atmosphere ◽  
Metal Substrate ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Vacuum Sintering ◽  
Screen Printing Technique

The construction of a metal-supported fuel cell has been recently generating a growing interest among the designers of solid oxide fuel cells. The present work is aimed at solving the problem related to high-temperature sintering of fuel cell NiO/YSZ anode on the porous metal substrate functioning both as a supporting structure and a reliable current collector. Hence, its irreversible oxidation during high-temperature sintering should be avoided. NiO/YSZ layers were applied on porous metal samples by a screen-printing technique and sintered in reducing and inert atmospheres, as well as in vacuum. The obtained layers were studied by means of scanning electron microscopy and X-ray phase analysis. It was shown that a temperature of 1000°С does not ensure a substantial sintering of Ni and YSZ granules in a reducing atmosphere. Under the sintering temperature above 1230°С in an inert atmosphere and vacuum, the nickel oxide dissociation and its massive agglomeration are observed. The conditions of NiO/YSZ layer vacuum sintering were experimentally determined which provide a high-grade sintering of nickel cermet granules without Ni agglomeration, disturbance of homogeneity in the formed anode layer, and the metal substrate oxidation.

Non-noble metal catalyst on carbon ribbon for fuel cell cathode

2017 ◽  
Vol 22 (3) ◽  
pp. 761-771 ◽  
Author(s):  
Dongrong Zeng ◽  
Jilin Huang ◽  
Zhipeng Lin ◽  
Xiang Yu ◽  
Yunfeng Zhan ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Noble Metal ◽  
Metal Catalyst ◽  
Noble Metal Catalyst ◽  
Fuel Cell Cathode ◽  
Cell Cathode

scholarly journals Selective CO Methanation in H2-Rich Gas for Household Fuel Cell Applications

Energies ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2844 ◽  
Author(s):  
Panagiota Garbis ◽  
Andreas Jess
Keyword(s):  
Fuel Cell ◽  
Natural Gas ◽  
Fixed Bed ◽  
Cell System ◽  
Operating Conditions ◽  
Attractive Alternative ◽  
Inlet Temperature ◽  
Co2 Methanation ◽  
Co Methanation ◽  
Selective Co Methanation

Polymer electrolyte membrane fuel cells (PEMFCs) are often used for household applications, utilizing hydrogen produced from natural gas from the gas grid. The hydrogen is thereby produced by steam reforming of natural gas followed by a water gas shift (WGS) unit. The H2-rich gas contains besides CO2 small amounts of CO, which deactivates the catalyst used in the PEMFCs. Preferential oxidation has so far been a reliable process to reduce this concentration but valuable H2 is also partly converted. Selective CO methanation considered as an attractive alternative. However, CO2 methanation consuming the valuable H2 has to be minimized. The modelling of selective CO methanation in a household fuel cell system is presented. The simulation was conducted for single and two-stage adiabatic fixed bed reactors (in the latter case with intermediate cooling), and the best operating conditions to achieve the required residual CO content (100 ppm) were calculated. This was done by varying the gas inlet temperature as well as the mass of the catalyst. The feed gas represented a reformate gas downstream of a typical WGS reaction unit (0.5%–1% CO, 10%–25% CO2, and 5%–20% H2O (rest H2)).

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