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RISS 인기검색어
- 검색키워드
- 저자 : J. Bilbao (검색결과 3 건)
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Catalytic cracking of raw bio-oil under FCC unit conditions over different zeolite-based catalysts
Alvaro Ibarra,Idoia Hita,Miren J. Azkoiti,Jose M. Arandes,Javier Bilbao 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.78 No.-
The performance of different zeolite-based catalysts (HY, HZSM-5 and HBeta) on the catalytic cracking ofbio-oil has been explored, using a simulated riser reactor and resembling industrial FCC conditions. Theeffect of the C/O (catalyst/bio-oil) ratio and the zeolite types have been assessed. The level ofdeoxygenation is >61% (increasing with C/O ratio). Total hydrocarbon yield was higher for the HBetacatalyst (56 wt%), while the liquid hydrocarbons yields were relatively similar for all catalysts, obtaininghigher gasoline yields with the HY catalyst (46–55 wt%), and higher LPG yields with the HZSM-5 catalyst(12–14 wt%) due to its higher acidity. The HY zeolite produced more coke (4–7 wt%) given its capacity forretaining coke precursors within its micropores.
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M. Cortazar,L. Santamaria,G. Lopez,J. Alvarez,M. Amutio,J. Bilbao,M. Olazar 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.99 No.-
The performance of Fe/olivine catalysts was tested in the continuous steam gasification of sawdust in abench scale plant provided with a fountain confined conical spouted bed reactor at 850 C. Olivine wasused as catalyst support and loaded with 5 wt%Fe. The activity and stability of the catalyst was monitoredby nitrogen adsorption-desorption, X-rayfluorescence spectroscopy, temperature programmedreduction, X-ray diffraction and X-ray photoelectron spectroscopy techniques, which were conductedbefore and after the runs. The fountain confined conical spouted bed performs well in the biomass steamgasification with primary catalysts. In fact, this reactor allows enhancing the gas-solid contact, andtherefore the catalytic activity by avoiding the elutriation offine catalyst particles. The uncatalysedefficiency of the gasification process, assessed based on the gas production and composition, H2production, tar concentration and composition, and carbon conversion efficiency, was considerabyimproved on the Fe/olivine catalyst, with tar reduction being especially remarkable (to 10.4 g Nm 3). After 140 min on stream, catalyst deactivation was particularly evident, as tar concentration increased to19.9 g Nm 3 (90% of that without catalyst). However, Fe/olivine catalyst was still active for WGS and CH4steam reforming reactions, with gas and H2 productions being 1.35 Nm3 kg 1 and 5.44 wt%, respectively. Metal iron oxidation to Fe3O4 caused catalyst deactivation, as the reaction environment shifted fromoxidizing to reducing conditions due to operational limitations.
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Behavior of SAPO-11 as acid function in the direct synthesis of dimethyl ether from syngas and CO2
M. Sánchez-Contador,A. Ateka,A.T. Aguayo,J. Bilbao 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.63 No.-
The kinetic behavior for methanol dehydration of different SAPOs (-11 and -18) and HZSM-5 zeolites (with different acidity and various acidity modification treatments) has been studied under the suitable conditions for the direct synthesis of dimethyl ether (DME) from H2 + CO + CO2. SAPO-11 shows a good performance for methanol dehydration, with DME yield above 80% and negligible paraffin formation, and has been assessed as acid function of a bifunctional catalyst in the single-stage synthesis of DME (with CuO–ZnO–ZrO2 as metallic function, metallic/acid mass ratio = 1/2). The bifunctional catalyst (CZZr/S-11) shows a stable kinetic behavior with high selectivity to DME (over 80%).
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