Reforma a seco de metano com catalisadores Ni/MCM-41 sintetizados a partir de fontes alternativas de sílica
The production of synthesis gas has received renewed attention due to demand for renewable energies to reduce the emissions of gases responsible for enhanced greenhouse effect. This work was carried out in order to synthesize, characterize and evaluate the implementation of nickel catalysts on MC...
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| Formato: | Dissertação |
| Idioma: | por |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/12986 |
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| Resumo: | The production of synthesis gas has received renewed attention due to demand for renewable
energies to reduce the emissions of gases responsible for enhanced greenhouse effect. This
work was carried out in order to synthesize, characterize and evaluate the implementation of
nickel catalysts on MCM-41 in dry reforming reactions of methane. The mesoporous
molecular sieves were synthesized using as silica sources the tetraethyl orthosilicate (TEOS)
and residual glass powder (PV). The sieves were impregnated with 10% nickel to obtain the
metallic catalysts (Ni/MCM-41). These materials were calcined and characterized by
Thermogravimetric Analysis (TG), Infrared spectroscopy (FTIR), X-ray Diffraction (XRD),
Temperature-Programmed Reduction (TPR) and N2 Adsorption/Desorption isotherms
(BET/BJH). The catalytic properties of the samples were evaluated in methane dry reforming
with CO2 in order to produce synthesis gas to be used in the petrochemical industry. The
materials characterized showed hexagonal structure characteristic of mesoporous material
MCM-41 type, being maintained after impregnation with nickel. The samples presented
variations in the specific surface area, average volume and diameter of pores based on the
type of interaction between the nickel and the mesoporous support. The result of the the
catalytic tests showed conversions about 91% CO2, 86% CH4, yelds about 85% CO and 81%
H2 to Ni/MCM-41_TEOS_C, and conversions about 87% CO2, 82% CH4, yelds about 70%
CO and 59% H2 to Ni/MCM-41_PV_C. The similar performance confirms that the TEOS can
be replaced by a less noble materials |
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