Recent progress on upgrading of bio-oil to hydrocarbons over metal/zeolite bifunctional catalysts

Shi, Yanchun; Xing, Enhui; Wu, Kejing; Wang, Jianlong; Yang, Mei; Wu, Yulong

doi:10.1039/c7cy00574a

Cited by 155 publications

(91 citation statements)

References 190 publications

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“…These carbon intermediates of different lengths must be converted into aromatics through the C2 to C4 olefin fragments that form “hydrocarbon pools.” The free radical mechanism for biomass pyrolysis has been proposed in previous reports and free radicals can be transferred to other species for chain growth. Aromatics are mainly formed by the aromatization of olefins, while hydrogen can be produced by aromatization …”

Section: Resultsmentioning

confidence: 99%

Influence of metal (Fe/Zn) modified ZSM‐5 catalysts on product characteristics based on the bench‐scale pyrolysis and Py‐GC/MS of biomass

et al. 2020

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In this study, sawdust was selected as the raw material for biomass pyrolysis to obtain organic products. The catalyst was modified with two elements (Fe and Zn). Through analysis of the catalytic products, we attempted to identify a pyrolysis catalyst that can improve the yield of aromatic hydrocarbon products.ZSM-5, modified with Fe and Zn, was investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, and Brunauer-Emmett-Teller (BET) measurements. Tube furnace and flash pyrolysis-gas chromatography-mass spectrometry (Py-GC/MS) were used to comprehensively investigate the characteristics of the products of biomass pyrolysis. The highest yield of phenols was obtained using the Femodified ZSM-5 catalyst, which was 18.30% higher than the yield obtained by the pure ZSM-5 catalyst. The lowest yield of acid products was obtained by single-metal-supported catalytic pyrolysis with Fe or Zn, which was 50.66% lower than the yield obtained by direct pyrolysis. During the pyrolysis of biomass using metal-modified catalysts, the production of aromatic hydrocarbons was greatly improved. Among them, compared with direct pyrolysis, the Fe-Zn co-modified ZSM-5 catalyst exhibited the weakest promotion of aromatic hydrocarbon formation, but there was still a 68.50% improvement. Although the co-modified catalyst did not show absolute advantages under the conditions used for this experiment, the improvements in the production of aromatics and phenolic products also showed its potential for improving bio-oil products. Under the action of Fe-modified catalysts, the most abundant components in the gas product were CO and CO 2 , which reached levels as high as 53.45% and 15.34%, respectively, showing strong deoxidation capabilities. Therefore, Fe-modified ZSM-5 catalysts were found to better promote the formation of aromatic hydrocarbon products of biomass pyrolysis. K E Y W O R D Scatalytic pyrolysis, modified ZSM-5, product characteristics: Py-GC/MS

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Section: Resultsmentioning

confidence: 99%

Influence of metal (Fe/Zn) modified ZSM‐5 catalysts on product characteristics based on the bench‐scale pyrolysis and Py‐GC/MS of biomass

et al. 2020

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“…have been widely studied since they possess excellent catalytic properties in HDO of phenolic compounds. Generally speaking, noble metal catalysts possess higher hydrogenation activity than non‐noble catalysts ,. Hence, noble catalysts alone are not a proper choice for producing aromatic hydrocarbons as benzene rings in reactant are tend to be saturated in HDO process .…”

Section: Hydrodeoxygenation Using H2mentioning

confidence: 99%

Catalytic Upgrading of Biomass Model Compounds: Novel Approaches and Lessons Learnt from Traditional Hydrodeoxygenation – a Review

et al. 2019

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Catalytic hydrodeoxygenation (HDO) is a fundamental process for bio-resources upgrading to produce transportation fuels or added value chemicals. The bottleneck of this technology to be implemented at commercial scale is its dependence on high pressure hydrogen, an expensive resource which utilization also poses safety concerns. In this scenario, the development of hydrogen-free alternatives to facilitate oxygen removal in biomass derived compounds is a major challenge for catalysis science but at the same time it could revolutionize biomass processing technologies. In this review we have analysed several novel approaches, including catalytic transfer hydrogenation (CTH), combined reforming and hydrodeoxygenation, metal hydrolysis and subsequent hydrodeoxygenation along with non-thermal plasma (NTP) to avoid the supply of external H 2 . The knowledge accumulated from traditional HDO sets the grounds for catalysts and processes development among the hydrogen alternatives. In this sense, mechanistic aspects for HDO and the proposed alternatives are carefully analysed in this work. Biomass model compounds are selected aiming to provide an in-depth description of the different processes and stablish solid correlations catalysts composition-catalytic performance which can be further extrapolated to more complex biomass feedstocks. Moreover, the current challenges and research trends of novel hydrodeoxygenation strategies are also presented aiming to spark inspiration among the broad community of scientists working towards a low carbon society where bio-resources will play a major role. Figure 1. Three basic phenylpropane monomers: (1) p-coumaryl alcohol; (2) coniferyl alcohol; (3) sinapyl alcohol.

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“…dehydration, isomerization, cracking, etc.) . Selection of the metal and zeolite functionalities strongly affects the final products distribution.…”

Section: Bio‐oil Upgrading To Fuels and Platform Chemicals By Catalytmentioning

confidence: 99%

“…Selection of suitable metal was proven to be efficient in controlling the selectivity between aromatics/cycloalkanes via hydrogenolysis/hydrogenation‐dehydration routes . Good results have been reported using ZSM‐5 modified with Ga, Zn and Ni, whereas Ru, Cu and Fe/zeolite catalysts showed good behavior in converting bio‐oil into BTX aromatics via hydrogenolysis . Encouraging results were also reported on the use of metal‐doped (Zn, Ce, Ni) mesoporous rod‐like Al 2 O 3 catalysts for the selective production of aromatics from the raw bio‐oil obtained by fast pyrolysis of sunflower stalk .…”

Section: Bio‐oil Upgrading To Fuels and Platform Chemicals By Catalytmentioning

confidence: 99%

Recent research progress on bio‐oil conversion into bio‐fuels and raw chemicals: a review

Valle

Remiro

García-Gómez

et al. 2018

J of Chemical Tech & Biotech

139

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Recent advances in lignocellulosic biomass valorization for producing fuels and commodities (olefins and BTX aromatics) are gathered in this paper, with a focus on the conversion of bio-oil (produced by fast pyrolysis of biomass). The main valorization routes are: (i) conditioning of bio-oil (by esterification, aldol condensation, ketonization, in situ cracking, and mild hydrodeoxygenation) for its use as a fuel or stable raw material for further catalytic processing; (ii) production of fuels by deep hydrodeoxygenation; (iii) ex situ catalytic cracking (in line) of the volatiles produced in biomass pyrolysis, aimed at the selective production of olefins and aromatics; (iv) cracking of raw bio-oil in units designed with specific objectives concerning selectivity; and (v) processing in fluidized bed catalytic cracking (FCC) units. This review deals with the technological evolution of these routes, in terms of catalysts, reaction conditions, reactors, and product yields. A study has been carried out on the current state-of-knowledge of the technological capacity, advantages and disadvantages of the different routes, as well as on the prospects for the implementation of each route within the scope of the Sustainable Refinery. /jctb 2 -C 4 olefins 147 a % Relative area: Percentage of total peak area detected by GC/MS semi-quantitative analysis.

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Recent progress on upgrading of bio-oil to hydrocarbons over metal/zeolite bifunctional catalysts

Abstract: Upgrading of bio-oil over metal/zeolite bi-functional catalysts, is of high necessity and popularity in converting biomass to high-quality hydrocarbons (transportation fuels and petrochemicals) to reduce the overall CO2 emissions of fossil based materials.

Cited by 155 publications

References 190 publications

Influence of metal (Fe/Zn) modified ZSM‐5 catalysts on product characteristics based on the bench‐scale pyrolysis and Py‐GC/MS of biomass

Influence of metal (Fe/Zn) modified ZSM‐5 catalysts on product characteristics based on the bench‐scale pyrolysis and Py‐GC/MS of biomass

Catalytic Upgrading of Biomass Model Compounds: Novel Approaches and Lessons Learnt from Traditional Hydrodeoxygenation – a Review

Recent research progress on bio‐oil conversion into bio‐fuels and raw chemicals: a review

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