In-situ catalytic upgrading of biomass pyrolysis vapor: Using a cascade system of various catalysts in a multi-zone fixed bed reactor

Asadieraghi, Masoud; Daud, Wan Mohd Ashri Wan

doi:10.1016/j.enconman.2015.05.008

Cited by 55 publications

(23 citation statements)

References 48 publications

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“…Nevertheless, there is an optimum amount of metallic or metal oxide species to be incorporated into zeolites as excessive loadings may lead to a dramatic loss of acidity, especially Brønsted acid sites, also necessary to drive the formation of aromatics via cyclization and oligomerization of light components. 352,353 In addition to acidity, porosity is also a key feature of zeolites in terms of activity, selectivity and deactivation resistance by coke deposition in catalytic pyrolysis. 332,333,338 It is quite difficult to correlate its direct impact on the product yield and distribution as changes in porosity are usually accompanied by variations in acidity (strength and accessibility).…”

Section: Biomass Transformationsmentioning

confidence: 99%

From 3D to 2D zeolite catalytic materials

et al. 2018

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Research activities and recent developments in the area of three-dimensional zeolites and their two-dimensional analogues are reviewed. Zeolites are the most important industrial heterogeneous catalysts with numerous applications. However, they suffer from limited pore sizes not allowing penetration of sterically demanding molecules to their channel systems and to active sites. We briefly highlight here the synthesis, properties and catalytic potential of three-dimensional zeolites followed by a discussion of hierarchical zeolites combining micro- and mesoporosity. The final part is devoted to two-dimensional analogues developed recently. Novel bottom-up and top-down synthetic approaches for two-dimensional zeolites, their properties, and catalytic performances are thoroughly discussed in this review.

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Section: Biomass Transformationsmentioning

confidence: 99%

From 3D to 2D zeolite catalytic materials

et al. 2018

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“…The organic liquid yield decreased from 35.7 wt-% without catalyst to 21.5 and 20.4 wt-% using the parent and meso-HZSM-5, respectively. Using a bench-scale fixed bed tubular reactor, Asadieraghi et al [26] evaluated the effect of added mesoporosity on the yield and composition of oil obtained at a cumulative biomass-to-catalyst ratios (B:C) = 10 from palm kernel shell.…”

Section: Introductionmentioning

confidence: 99%

Catalytic deoxygenation of vapors obtained from ablative fast pyrolysis of wheat straw using mesoporous HZSM-5

Eschenbacher

Jensen

Henriksen

et al. 2019

Fuel Processing Technology

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Steam treated HZSM-5 with different Si/Al ratios were tested as catalysts for the upgrading of wheat straw pyrolysis vapors and their performance was compared to hierarchical counterparts, which were prepared by desilication followed by acid washing. Pyrolysis vapors were generated in an ablative system, hot gas filtered, and upgraded in an ex-situ catalyst bed to remove oxygen functionalities and reduce the oils' total acid number (TAN). Besides elemental analysis and TAN, the collected liquids were analyzed for water, chemical composition by gas chromatography mass spectrometry with flame ionization detection (GC-MS/FID), size exclusion chromatography (SEC), thermogravimetric analysis (TGA), and selectively by 1 H nuclear magnetic resonance (NMR), 13 C NMR, and two-dimensional heteronuclear single-quantum correlation (2D HSQC) NMR.Hierarchical and conventional catalysts were analyzed with X-ray fluorescence (XRF), ammonia temperatureprogrammed desorption (NH3-TPD) and ethylamine TPD, N2 and Ar-physisorption, transmission electron microscopy (TEM) and X-ray diffraction (XRD) to investigate changes induced by the desilication process. In addition, samples were analyzed after several reaction and regeneration cycles to investigate catalyst stability. The hierarchical samples showed an increased coking propensity compared to their parent version. The introduction of mesopores after desilication of HZSM-5 with molar Si/Al ratios of 29 and 39 lead to prolonged activity in deoxygenation and improved carbon recovery in the collected oil fractions compared to the parent counterparts.The results indicate that mild deoxygenation may be a viable way of pretreating pyrolysis oil before co-processing with fossil oil in refineries.

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“…[95] In addition, Asadieraghi and co-workers have studied the in situ catalytic upgrading of palm kernels hell (PKS) fast pyrolysis vaporsb yu sing ac ascades ystem of various catalysts (meso-HZSM-5, Ga/meso-HZSM-5 and Cu/SiO 2 catalyst) in amultizone fixed-bed reactor. [96] Relative to the performance of the individual catalysts, meso-HZSM-5, Ga/meso-HZSM-5, and Cu/SiO 2 ,acascade system involving the meso-HZSM-5, Ga/meso-HZSM-5,a nd Cu/SiO 2 catalysts showst he best performance on lignin-derived phenolics bio-oild eoxygenation and aromatics formation. Melligana nd co-workers have hydropyrolyzed biomass and have online catalytically upgraded the vapor with Ni-ZSM-5 and Ni-MCM-4.…”

Section: Real Feedmentioning

confidence: 97%

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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In-situ catalytic upgrading of biomass pyrolysis vapor: Using a cascade system of various catalysts in a multi-zone fixed bed reactor

Cited by 55 publications

References 48 publications

From 3D to 2D zeolite catalytic materials

From 3D to 2D zeolite catalytic materials

Catalytic deoxygenation of vapors obtained from ablative fast pyrolysis of wheat straw using mesoporous HZSM-5

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

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