Effect of properties of various activated-carbon supports and supported Fe-Mo-Cu-K catalysts on metal precursor distribution, metal reduction, and fischer-tropsch synthesis (Record no. 172040)
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| 000 -LEADER | |
|---|---|
| fixed length control field | 04558nab a2200205 4500 |
| 008 - CÓDIGOS DE INFORMACIÓN DE LONGITUD FIJA - INFORMACIÓN GENERAL | |
| Campo de control de longitud fija | 260224s2010 xxu |
| 245 00 - TITULO | |
| Título | Effect of properties of various activated-carbon supports and supported Fe-Mo-Cu-K catalysts on metal precursor distribution, metal reduction, and fischer-tropsch synthesis |
| 260 ## - PUBLICACION, DISTRIBUCION, ETC | |
| Lugar de publicación, distribución, etc. | |
| Nombre de publicador, distribuidor, etc. | |
| Fecha de publicación, distribución, etc. | jul./ago. 2010 |
| 270 ## - FECHA DE CARGA | |
| Fecha de carga | 23/11/2010 ; 23/11/2010 |
| 300 ## - DESCRIPCION FISICA | |
| Otra extensión | 12 p. ; 4099–4110 |
| 520 ## - RESUMEN, ETC | |
| Resumen | Transcripción del resumen del autor. The physical and surface chemistry properties of four activated carbons (ACs) have been studied, and the effects of these properties on the distribution and reduction of metal precursors of Fischer-Tropsch (FT) catalysts have been noted. The four ACs used have been derived from peat, generic wood, pecan, and walnut. The catalysts used are Fe with Mo-Cu-K additives, supported on the various ACs, successfully used earlier for selective production of C1-C34 hydrocarbons. Characterization techniques used include Brunauer-Emmett-Teller (BET), scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS), surface pH, temperature-programmed desorption-mass spectrometry (TPD-MS), transmission electron microscopy (TEM), and temperature-programmed reduction (TPR). The BET and SEM results show that the four ACs have similar overall pore-size distributions qualitatively. All ACs contain 75-94% micropores. The four ACs differ considerably in their surface morphology, surface area, and amounts of micro-, meso-, and macropores. The AC derived from peat is the least porous. ACs derived from pecan and walnut show ridges containing small spherical agglomerates. These ACs contain relatively more meso- and macropores (wide pores) than the wood AC, which has a wide distribution of irregular agglomerates. The EDS result indicates that all four ACs contain 5.6-7.5% oxygen; the wood- and peat-based varieties include smaller amounts of other impurities as well. The results of pH and TPD indicate that the surface of all four ACs are primarily covered by neutral and/or basic oxygen-containing groups, along with small amounts of acidic oxygen groups. Analyzing the BET, TPD, and TEM results of the four carbon-supported Fe-Mo-Cu-K catalysts shows that metal precursors are uniformly distributed on each AC surface, but the distribution of metal precursors on the carbon surface is likely related to pore types and amounts and not the total surface area of supports. Wide pores play a more important role to distribute metal precursors than micropores. Metal precursors tend to be present predominantly inside the pores of the peat-, pecan-, and walnut-based ACs, which contain greater amounts of wide pores. However, for the wood-based AC, which contains greater amounts of micropores, more metal precursors tend to be present on the exterior surface and the average metal particle size is also larger. The TPR and BET results indicate that the interaction between metallic precursors and the AC surface appears to be associated with both the chemical nature of the AC support and size of metal precursors. TPR and TPD indicate that stronger interactions between metal precursors and supports are observed on the peat-based ACs, with more neutral or basic oxygen-containing groups and smaller metal sizes, and the weakest interactions are observed on the wood-based AC support. The large particles on the exterior of the wood-based AC surface likely weaken the interaction. All four catalysts were used in FT reactions. Estimated values of the turnover frequency and activation energy are consistent with values reported in the literature for similar catalysts. The relationships between the performance of the catalyst in the FT reaction and AC type are discussed in this paper as well. The Fischer-Tropsch synthesis (FTS) activity can be related directly to the BET parameters associated with the relative ease of mass transfer and the relative fraction of metal crystallites present in the wide pores and inversely to the metal crystallite size. The selectivity toward C5+ products is related to the amount of species evolved during the TPR of the AC support, primarily the number of basic and neutral species on the surface. High selectivity toward C1 correlates well to the low pH of the external surface of the support. |
| 581 ## - ESTADO DE COLECCIÓN | |
| Estado de colección | 4 |
| 773 0# - CORRECCIÓN | |
| Título | Energy & fuels |
| Partes relacionadas | 24 |
| 942 ## - DESC. DE MATERIAL | |
| Tipo de item KOHA | Artículo de Revista |
| 100 1# - RESPONSABLE PERSONAL | |
| Apellido, Nombre | Ma, Wenping |
| 9 (RLIN) | 43773 |
| 100 1# - RESPONSABLE PERSONAL | |
| Apellido, Nombre | Kugler, Edwin L. |
| 9 (RLIN) | 43774 |
| 100 1# - RESPONSABLE PERSONAL | |
| Apellido, Nombre | Dadyburjor, Dady B. |
| 9 (RLIN) | 43775 |
| Biblioteca propietaria | Biblioteca actual | Fecha de adquisición | Inventario | Total de préstamos | Inventario | Fecha de carga | Tipo de item KOHA |
|---|---|---|---|---|---|---|---|
| Biblioteca Alejandro Angel Bulgheroni | Biblioteca Alejandro Angel Bulgheroni | 05/03/2026 | 200050010 | 200050010 | 05/03/2026 | Artículo de Revista |
