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http://cimav.repositorioinstitucional.mx/jspui/handle/1004/1376| SER PROCESS VARIABLE EVALUATION FOR THE PRODUCTION OF HYDROGEN USING CALCINED DOLOMITE | |
| ALEJANDRO LOPEZ ORTIZ VIRGINIA HIDALINA COLLINS MARTINEZ | |
| Acceso Abierto | |
| Sin Derechos Reservados | |
| Hydrogen | |
| The present study shows results of tests aiming to establish the reaction performance of the steam methane reforming process (SMR) using commercial dolomite as inexpensive solid CO2 absorbent, leading to the sorption enhanced reforming (SER) process for the production of hydrogen. The combined reforming, shift, and CO2 separation reactions were studied using a laboratory-scale fixed-bed reactor as a function of temperature, feed gas composition, dolomite type, and dolomite and catalyst particle sizes. A fixed bed reactor was loaded with a mixture of calcined dolom≈it e2 (3g) and a commercial reforming catalyst (NiO/Al2O3, United Catalysts≈, 10g). Pressure was fixed at 15 atm, while temperature was varied from 550 to 650°C. Feed gas composition was varied from 6 to 20% CH4/balance N2 and steam, with a feed H2O/CH4 ratio = 4. Two sources of dolomite were used; Rockwell and Stonelite. Particle sizes of dolomite and catalyst were 75>dp>150 μm and 300>dp>425 μm, respectively and were inversely varied. Experimental results showed that at the low temperature of 550°C the formation of Ca(OH)2 is possible, thus reducing the available CaO for carbonation present in calcined dolomite and negatively affecting the performance of the SER system, while 650°C reached the SER thermodynamic equilibrium (TE). The use of dolomite approached the TE of the feed gas compositions studied, disregarding of its source. Kinetic effects observed in the tests suggest that small dolomite and large catalyst particles favor the decrease of CO2 diffusion effects. | |
| 2010 | |
| Memoria de congreso | |
| Inglés | |
| OTRAS | |
| Versión revisada | |
| submittedVersion - Versión revisada | |
| Aparece en las colecciones: | Artículos de Congresos |
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| XSMH034 SER PROCESS VARIABLE EVALUATION FOR THE PRODUCTION OF HYDROGEN USING CALCINED DOLOMITE.pdf | 191.68 kB | Adobe PDF | Visualizar/Abrir |