Direct upgrading of fast pyrolysis lignin vapor over the HZSM-5 catalyst

Zhou, Guofeng; Jensen, Peter Arendt; Le, Duy Michael; Knudsen, Niels Ole; Jensen, Anker Degn

doi:10.1039/c5gc01976a

Cited by 122 publications

(74 citation statements)

References 46 publications

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“…Fast pyrolysis (FP) of the pinewood produced a water‐free basis bio‐oil (organic fraction) yield of 51.3 %. As expected, the elemental analysis of the FP oil shows oxygen composition similar to its biomass precursor, i. e. 38.7 % versus 42.8 %, respectively. This implies the inefficacy of a pure thermal degradation to effectively deoxygenate the intermediate volatiles that eventually condenses into the organic liquid product .…”

Section: Resultssupporting

confidence: 78%

Hybridization of ZSM‐5 with Spinel Oxides for Biomass Vapour Upgrading

et al. 2020

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In this study, we report catalytic fast pyrolysis of biomass using multifunctional hybrid spinel‐oxide@zeolite catalysts prepared by using the steam‐assisted crystallization (SAC) method to create the mesoporous zeolite followed by urea hydrolysis of metal nitrates to deposit spinel‐oxides. This hybrid catalyst was quite effective in the deoxygenation of pinewood sawdust pyrolysis vapours, while avoiding over cracking of the lignin precursors, which are already ideal as chemical and fuel precursors. In the first step, multiple spinel oxides MgB2O4 (where B=Fe, Al, Ce, Ga, Cr) were screened as catalysts for the pyrolysis of pinewood sawdust and the resultant bio‐oil (bio‐oil on the water‐free basis) was assessed in terms of carbon efficiency, oxygen content and chemical composition. While all the tested spinel oxides deoxygenated the pyrolysis vapour, MgAl2O4 and MgFe2O4 were found to provide a well‐balanced deoxygenation degree and producing bio‐oil with acceptable carbon efficiency. Catalytic activity and product distribution were affected by the density and strength of the acid sites of the spinel oxides. Subsequently, CFP over MgFe2O4@ZSM5 and MgAl2O4@ZSM5 was investigated under similar condition. The better performance of the hybrid catalyst was attributed to the deposition of small particles of MgFe2O4 in the external surface of the zeolite. The presence of this spinel oxide on the external surface depolymerized bulky oxygenates to lighter fractions that could easily access the active sites within the mesoporous structure of the zeolite, thus providing the catalytic function needed for the oxygen removal after aromatic ring saturation.

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Section: Resultssupporting

confidence: 78%

Hybridization of ZSM‐5 with Spinel Oxides for Biomass Vapour Upgrading

et al. 2020

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“…By pyrolysis of the individual components of lignocellulosic biomass, Wang and co‐workers have found that dehydration is the primary pathway to remove oxygen in the ex situ CFP of lignin over HZSM‐5, and the phenolic compounds generated from the thermal decomposition of lignin are prone to form coke/char . Zhou and co‐workers have developed a continuous fast pyrolysis reactor to upgrade lignin pyrolysis vapors over coupled HZSM‐5 catalysts through an ex situ CFP process . At 600 °C, 70 wt % of oxygen‐free aromatics (mainly benzene and toluene) can be obtained in the organic liquid product.…”

Section: Upgrading Lignin Pyrolysis Vapors By Cracking and Aromatizamentioning

confidence: 99%

“…reactor to upgrade lignin pyrolysis vaporso ver coupled HZSM-5 catalysts through an ex situ CFP process. [41] At 600 8C, 70 wt %o fo xygen-free aromatics (mainly benzene and toluene)c an be obtained in the organic liquid product. In general, HZSM-5-based catalysts show good performance for lignin conversion by the ex situ CFPp rocess.B oth an improvement in the catalyst and better reactord esign are necessary to achieve ahigher yield of aromatics from lignin.…”

Section: Ex Situ Cfp Of Modelcompoundsmentioning

confidence: 99%

Advances in Upgrading Lignin Pyrolysis Vapors by Ex Situ Catalytic Fast Pyrolysis

Zhang

2016

Energy Tech

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Lignin, a highly branched, substituted, mononuclear aromatic polymer, is one of the principal components of lignocellulosic biomass. Its valorization is considered an important part of the modern biorefinery scheme. However, as a result of the natural complexity and high stability of lignin, its depolymerization and the following conversion are challenging. The unique structure and composition of lignin offer many possible routes to produce liquid fuels and chemicals. Recognized as an efficient and feasible process, ex situ catalytic fast pyrolysis (CFP) has attracted much attention for upgrading lignin and lignin pyrolysis vapors. The main challenge of this process is the development of active and stable catalysts that can effectively break the C−O bond of lignin and decompose the intermediates. In this Review, we aim to provide an overview of recent advances on a related topic. The Review introduces ex situ CFP, the reactions and pathways of lignin vapors in the ex situ CFP process, and summarizes in detail recent progress in experimental studies on upgrading lignin‐derived model phenols, lignin, and lignin pyrolysis vapors to hydrocarbons by the ex situ CFP process over different catalysts.

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“…However, the detailed contributions of H 2 O, CO and CO 2 to the overall deoxygenation as a function of cracking temperature are scarcely reported in the literature. A reason for this situation might be a lack of the accurate data of water yield at least in some cases, since the water determination could be largely interfered by the dehydration of HZSM-5 itself (Zhou et al, 2016). In our experiment, the design of a bypass line in the reactor system (Fig.…”

Section: Insight Into the Catalytic Effects Of Hzsm-5mentioning

confidence: 99%

“…In all above two-stage pyrolysis experiments, however, the composition of bio-oil was reckoned in the light of peak areas of GC-MS or MB-MS. Most recently, Zhou et al (2016) presented an investigation into the catalytic upgrading of fast pyrolysis lignin vapor with HZSM-5. The yields of main light aromatics such as BTXN and light hydrocarbon gases (CH 4 , C2-C3) were quantitatively determined.…”

Section: Introductionmentioning

confidence: 99%