Performance of mesoporous ZSM-5 in deoxygenation of straw derived pyrolysis vapors

Andreas Eschenbacher, Peter A. Jensen, Ulrik B. Henriksen, Jesper Ahrenfeldt, Uffe V. Mentzel, Anker D. Jensen

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Fast pyrolysis of biomass produces a high yield of bio-oil through well-established technologies at optimized temperature, pressure, and residence time of the liberated pyrolysis vapors [1], [2]. In order to allow processing in oil refineries, further conversion that reduces the oil`s oxygen content and acid number deserve prioritized attention [3]. Deoxygenation can be obtained by catalytic upgrading over solid acid catalysts. A close coupled process operating at temperature and pressure conditions close to those for optimum liquid yields in pyrolysis units offers potential economic advantages for zeolitede oxygenation over high pressure hydrotreating [4]. To date, the medium pore size ZSM-5 zeolite provides a high aromatic yield and the least amount of coke [5] in upgrading of pyrolysis vapors. The coke caused by reactive pyrolysis vapors may form an envelope covering the zeolite crystals and block the pore mouth entries. The rapid decay in site accessibility requires frequent regeneration to recover activity. In addition, irreversible dealumination can be caused by steam from the pyrolysis process, the dehydration reactions during upgrading and the steam produced during oxidative regeneration. We address the reversible deactivation due to coke by introducing an auxiliary mesopores network to improve the accessibility and prolong the zeolite`s active time on stream. In order to minimize the irreversible deactivation, the zeolites acid site strength and density have to be carefully balanced with additional metal promoters or modification by phosphorous.
Original languageEnglish
Publication date2018
Number of pages1
Publication statusPublished - 2018
Event18th Nordic Symposium on Catalysis - Copenhagen, Denmark
Duration: 26 Aug 201828 Aug 2018
Conference number: 18


Conference18th Nordic Symposium on Catalysis
Internet address


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