Person: Navarro Puyuelo, Andrea
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Navarro Puyuelo
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Andrea
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Ciencias
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InaMat2. Instituto de InvestigaciĆ³n en Materiales Avanzados y MatemĆ”ticas
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0000-0001-8715-6742
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811365
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Publication Open Access Effect of oxygen addition, reaction temperature and thermal treatments on syngas production from biogas combined reforming using Rh/alumina catalysts(Elsevier, 2019) Navarro Puyuelo, Andrea; Reyero Zaragoza, InĆ©s; Moral LarrasoaƱa, Ainara; Bimbela Serrano, Fernando; BaƱares, Miguel A.; GandĆa Pascual, Luis; Ciencias; Zientziak; Institute for Advanced Materials and Mathematics - INAMAT2Dry reforming and partial oxidation of biogas were studied using 0.5 wt.% Rh/Al2O3 catalysts, both inhouse prepared and commercial. The effects of O2 addition on syngas yield and biogas conversion were studied at 700 C using different O2/CH4 ratios in the gas feeding stream: 0 (dry reforming), 0.12, 0.25, 0.45 and 0.50. The highest CH4 conversion, H2 yield and H2/CO molar ratio were obtained with an O2/CH4 ratio of 0.45, even though simultaneous valorization of both CH4 and CO2 could be best attained when the O2/CH4 ratio was 0.12. Increased biogas conversions and syngas yields were obtained by increasing reaction temperatures between 650 and 750 C. A detrimental influence on catalytic activity could be observed when the catalyst was subjected to calcination. Increasing the hold time of the thermal conditioning of the catalyst under inert flow altered Rh dispersion, though had no significant impact on catalyst performance in the dry reforming of methane at 700 C and 150 N L CH4/(gcat h). Characterization of spent samples after reaction by Raman spectroscopy revealed the presence of carbonaceous deposits of different nature, especially on the commercial(named as Rh com) and calcined (Rh calc) catalysts, though oxygen addition in the biogas feed significantly reduced the amount of these deposits. The Rh catalysts that had not been calcined after impregnation (Rh prep) did not present any noticeable characteristic peaks in the G and D bands. In particular, scanning transmission electron microscopy (STEM) images of the spent Rh prep sample revealed the presence of very highly dispersed Rh nanoparticles after reaction, of particle sizes of about 1 nm, and no noticeable C deposits. Combined oxy-CO2 reforming of biogas using highly dispersed and low metal-loading Rh/Al2O3 catalysts with low O2 dosage in the reactor feed can be used to effectively transform biogas into syngas.Publication Open Access Remarkable performance of supported Rh catalysts in the dry and combined reforming of biogas at high space velocities(Elsevier, 2024) Navarro Puyuelo, Andrea; Atienza MartĆnez, MarĆa; Reyero Zaragoza, InĆ©s; Bimbela Serrano, Fernando; GandĆa Pascual, Luis; Ciencias; Zientziak; Institute for Advanced Materials and Mathematics - INAMAT2; Universidad PĆŗblica de Navarra / Nafarroako Unibertsitate PublikoaDry and combined (with O2) reforming of synthetic biogas were studied at 700 Ā°C using 0.5 % Rh catalysts prepared by impregnation on different supports: Ī³-Al2O3, SiO2, TiO2, ZrO2 and CeO2. Gas hourly space velocity (GHSV) was varied between 150 and 700 N L CH4/(gcatĀ·h), and two O2/CH4 molar ratios of 0 and 0.12 were studied. Rh/Al2O3 catalysts (prepared using two different commercial supports here denoted as Sph and AA) presented the highest biogas conversion and syngas yields under both dry and combined reforming conditions. Catalytic activities were as follows: Rh/AA ā Rh/Sph > Rh/SiO2 > Rh/ZrO2 ā Rh/CeO2 > Rh/TiO2. The effect of catalystsā calcination pre-treatment at relatively low (200 Ā°C) and high temperatures (750 Ā°C) was also studied. Calcination at high temperatures had a detrimental effect on both dry and combined reforming activities. However, a positive effect on the reforming activities and syngas yields was observed when the catalysts were calcined at 200 Ā°C, especially under biogas combined reforming conditions: higher CH4 conversions and syngas yields could be achieved, as well as increasing CO2 conversions, though at the expense of lower H2/CO molar ratios.Publication Open Access Rutas y retos para la valorizaciĆ³n de biogĆ”s(Universidad Libre (Colombia), 2017) Navarro Puyuelo, Andrea; Reyero Zaragoza, InĆ©s; Moral LarrasoaƱa, Ainara; Bimbela Serrano, Fernando; GandĆa Pascual, Luis; QuĆmica Aplicada; Kimika AplikatuaLas tecnologĆas de digestiĆ³n anaerobia para procesar corrientes residuales (fracciĆ³n orgĆ”nica de resiĀduos de vertedero, lodos de estaciones depuradoras de aguas residuales, purines, etc.) han originado un incremento de la producciĆ³n de biogĆ”s. El biogĆ”s estĆ” compuesto principalmente por metano y diĆ³xido de carbono, aunque contiene otros componentes minoritarios e impurezas que obligan a efectuar tratamientos para su purificaciĆ³n y acondicionamiento. Existen diversas alternativas para el aprovechamiento y la valorizaciĆ³n de este gas, como son: su utilizaciĆ³n directa en la generaciĆ³n de energĆa calorĆfica y/o elĆ©ctrica, su conversiĆ³n a biometano, y la producciĆ³n de gas de sĆntesis (H2+ĀCO), que posteriormente permite producir combustibles lĆquidos y/o compuestos quĆmicos de interĆ©s como el metanol. En este trabajo se presenta una revisiĆ³n general de las alternativas de valorizaciĆ³n de biogĆ”s, con Ć©nfasis en los procesos de reformado catalĆtico, tales como el reformado seco o con vapor de agua y procesos de reformado combinado incluyendo la oxidaciĆ³n parcial.Publication Embargo How bimetallic CoMo carbides and nitrides improve CO oxidation(Elsevier, 2023) Villasana, Yanet; GarcĆa-Macedo, Jorge A.; Navarro Puyuelo, Andrea; Boujnah, Mourad; Reyero Zaragoza, InĆ©s; Lara-GarcĆa, Hugo A.; MuƱiz, JesĆŗs; Bimbela Serrano, Fernando; GandĆa Pascual, Luis; Brito, Joaquin L.; MĆ©ndez, Franklin J.; Institute for Advanced Materials and Mathematics - INAMAT2CO elimination is an important step for the proper management of gaseous effluents from various processes, thus avoiding adverse impacts on the environment and human health. In this study, different bimetallic Al2O3-supported CoMo catalysts have been developed, characterized, and tested in the CO oxidation reaction, based on their respective oxides, carbides, and nitrides phases. The parent CoMo-oxide catalyst (CoMo) was prepared by impregnation and then transformed to its carburized (CoMoC) and nitrided (CoMoN) forms using temperatureprogrammed reaction methods under controlled atmospheres of CH4/H2 and NH3, respectively. The catalytic results demonstrate that the CoMoC catalyst exhibits higher activity compared to its CoMoN counterpart, and both are more active than the parent CoMo catalyst. Furthermore, the reduction temperature and space velocity were key process factors, which notably influenced activity and kinetic parameters, while the increase of reduction time does not seem to improve catalytic behavior. These results were associated with a better metal dispersion, and relatively higher reduction grade and metallic surface area on the carbides and nitrides, opening the possibility that new adsorption sites may be created. The catalytic results compare favorably with other nonnoble metal catalysts, such as Cr-, Cu-, Fe-, and Ni-based samples, and highlight the potential of using carbides and nitrides as alternative formulations to enhance the performance of CO oxidation.