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RISS 인기검색어
- 검색키워드
- 저자 : Martin Olazar (검색결과 4 건)
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Lide Oar-Arteta,,Aingeru Remiro,Andre´ s T. Aguayo,Martin Olazar,Javier Bilbao,Ana G. Gayubo 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.36 No.-
This study aims at optimizing the composition of the bifunctional catalyst with CuFe2O4 spinel metallicfunction for the steam reforming of DME (SRD). The g-Al2O3 obtained by calcination of boehmite at550 8C proves to be the most suitable acid function, given that it provides high activity for DMEhydrolysis and avoids hydrocarbon formation in the 300–400 8C range. Furthermore, the optimum massratio between CuFe2O4 and g-Al2O3 functions is 1/1 at 350 8C, since it allows obtaining the highest DMEconversion and H2 yield with suitable catalyst stability and mechanical resistance.
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Catalytic steam reforming of biomass fast pyrolysis volatiles over Ni–Co bimetallic catalysts
Laura Santamaria,Gartzen Lopez,Aitor Arregi,Maite Artetxe,Maider Amutio,Javier Bilbao,Martin Olazar 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.91 No.-
The influence of the metal selected as catalytic active phase in the two-step biomass pyrolysis-catalyticreforming strategy has been analyzed. The pyrolysis step was carried out in a conical spouted bed reactorat 500 C, whereas steam reforming was performed in afluidized bed reactor at 600 C. Ni/Al2O3,Co/Al2O3 and two bimetallic Ni-Co/Al2O3 catalysts with different metal loadings were synthesized by wetimpregnation method, and fresh and deactivated catalysts were characterized by N2 adsorption/desorption, X-ray Fluorescence (XRF), Temperature Programmed Reduction (TPR), X-Ray powderDiffraction (XRD), Temperature Programmed Oxidation (TPO), Scanning Electron Microscopy (SEM) andTransmission Electron Microscopy (TEM). Although Ni/Al2O3 and both bimetallic catalysts had similarinitial activity in terms of oxygenate conversion, (higher than 98%), the poorer metal dispersion observedin both bimetallic catalysts led to a fast decrease in conversion due to the promotion of coke formation onlarge particles. This occurred even though Ni–Co alloy formation has a positive influence by hindering theoxidation of Co0 species. The main cause for the deactivation of these catalysts is the formation of a cokewith amorphous structure. The poor initial performance of Co/Al2O3 catalyst is related to changes in theCo0 oxidation state induced by the presence of steam, which led to a fast deactivation of this catalyst.
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Fine particle flow pattern and region delimitation in fountain confined conical spouted beds
Mikel Tellabide,Idoia Estiati,Aitor Atxutegi,Haritz Altzibar,Roberto Aguado,Martin Olazar 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.95 No.-
A novel borescopic technique together with the monitoring of pressurefluctuation signals (powerspectral distribution, PSD) has been used to trackfine particles and characterize solidflow dynamics infountain confined conical spouted beds. Radial and axial particle velocity profiles have been obtained fordifferent configurations, and spout-annulus and fountain core-periphery interfaces have beendelineated. The downward particle velocities in the annulus peak at intermediate positions in thiszone, whereas the upward velocities in the dilute zones (spout and fountain core) peak at the axis or closeto this position. Among the different configurations analysed in this work, the system without draft tubeshows the greatest vertical particle velocities in almost all the different radial and axial positions. Theevolution of the spout size along the bed depends on the configuration used, but all of them differ fromthose commonly reported in the literature. Thus, the spout expands from the bed bottom to the surface,without any neck at an intermediate bed level. Furthermore, the cross-sectional spout shape has beendelineated in the systems with open-sided draft tube, and significant spout expansion is observed due toair percolation from the spout into the annulus through the opened faces. Finally, the average spoutdiameters of the systems without draft tube and with open-sided draft tubes have been compared withthose predicted by literature correlations. Those proposed by San José et al. and Volpicelli et al. providethe bestfit for the configurations without draft tube and with open-sided draft tube, with their relativeerrors being 9.83% and 8.88%, respectively.
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Regenerability of a Ni catalyst in the catalytic steam reforming of biomass pyrolysis volatiles
Aitor Arregi,Gartzen Lopez,Maider Amutio,Itsaso Barbarias,Laura Santamaria,Javier Bilbao,Martin Olazar 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.68 No.-
A study has been carried out of the regenerability of a commercial Ni catalyst used in the steam reforming of the volatiles from biomass pyrolysis (gases and bio-oil), determining the evolution of the reaction indices (conversion, product yields and H2 production) in successive reaction–regeneration cycles. The causes of catalyst deactivation (coke deposition and Ni sintering) have been ascertained characterizing the deactivated and regenerated catalysts by TPO, TEM, TPR and XRD. Catalyst activity is not fully recovered by coke combustion in the first cycles due to the irreversible deactivation by Ni sintering, but the catalyst reaches a pseudo-stable state beyond the fourth cycle, reproducing its behaviour in subsequent cycles.
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