Catalytic upgrading of Elephant grass ( Pennisetum purpureum Schum) pyrolysis vapor using WO 3 supported on RHA and RHA-MCM-41

Braga, Renata Martins; Melo, D.M.A.; Sobrinho, Eledir V.; Barros, Joana M. F.; Melo, M. A. F.; Carvalho, Alexandre Fontes Melo de; Fontes, Maria do Socorro Braga; Freitas, Júlio Cézar de Oliveira

doi:10.1016/j.cattod.2016.06.003

Cited by 25 publications

(13 citation statements)

References 26 publications

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“…Most literature reported values determined by x-ray fluorescence (XRF) and energy dispersive x-ray (EDX), which are point analysis. In this study, the major elements recorded in the feedstock using atomic absorption spectrometer (AAS) showed mineralogical composition (Na, K, Ca, Al, Fe and Si) similar to that reported by Strezov et al [27].…”

Section: Feedstock Characteristicssupporting

confidence: 89%

“…Only recently, Braga et al [27] reported catalytic upgrading of pyrolysis vapour from NG using WO 3 supported on rice husk ash and RHA-MCM-41 as the catalysts in a microreactor. The authors reported that phenols, furans, ketones and acetic acid were converted to monoaromatic hydrocarbons over WO 3 /RHA at 600 °C and was attributed to the catalytic activity of WO 3 .…”

Section: Application Of Hierarchical Mesoporous Zsm-5 In Catalytic Dementioning

confidence: 99%

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In-situ Upgrading of Napier Grass Pyrolysis Vapour Over Microporous and Hierarchical Mesoporous Zeolites

Mohammed

Abakr

Kazi

2017

Waste Biomass Valor

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This study presents in-situ upgrading of pyrolysis vapour derived from Napier grass over microporous and mesoporous ZSM-5 catalysts. It evaluates effect of process variables such catalyst-biomass ratio and catalyst type in a vertical fixed bed pyrolysis system at 600 o C, 50 o C/min under 5 L/min nitrogen flow. Increasing catalyst-biomass ratio during the catalytic process with microporous structure reduced production of organic phase bio-oil by approximately 7.0 wt%. Using mesoporous catalyst promoted nearly 4.0 wt% higher organic yield relative to microporous catalyst, which translate to only about 3.0 wt% reduction in organic phase compared to the yield of organic phase from noncatalytic process. GC-MS analysis of bio-oil organic phase revealed maximum degree of deoxygenation of about 36.9 % with microporous catalyst compared to the mesoporous catalysts, which had between 39 and 43 %. Mesoporous catalysts promoted production olefins and alkanes, normal phenol, monoaromatic hydrocarbons while microporous catalyst favoured the production of alkenes and polyaromatic hydrocarbons. There was no significant increase in the production of normal phenols over microporous catalyst due to its inability to transform the methoxyphenols and methoxy aromatics. This study demonstrated that upgrading of Napier grass pyrolysis vapour over mesoporous ZSM-5 produced bio-oil with improved physicochemical properties.

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Section: Feedstock Characteristicssupporting

confidence: 89%

Section: Application Of Hierarchical Mesoporous Zsm-5 In Catalytic Dementioning

confidence: 99%

In-situ Upgrading of Napier Grass Pyrolysis Vapour Over Microporous and Hierarchical Mesoporous Zeolites

Mohammed

Abakr

Kazi

2017

Waste Biomass Valor

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“…The high proportion of C 1 –C 4 compounds is noteworthy among the pyrolysis products of this biomass, which are products from the cracking of larger molecules such as polysaccharides and lignin. These compounds (C 1 –C 4 ) are characterized by different organic acids, such as acetic acid, acetic anhydride, methyl acetate, formic acid, and others that give bio-oil chemical instability and low energetic potential 28 .…”

Section: Resultsmentioning

confidence: 99%

Colored cotton wastes valuation through thermal and catalytic reforming of pyrolysis vapors (Py-GC/MS)

Silva

Calixto

Medeiros

et al. 2021

Sci Rep

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This study aims to analyze the products of the catalytic pyrolysis of naturally colored cotton residues, type BRS (seeds from Brazil), called BRS-Verde, BRS-Rubi, BRS-Topázio and BRS-Jade. The energy characterization of biomass was evaluated through ultimate and proximate analysis, higher heating value, cellulose, hemicellulose and lignin content, thermogravimetric analysis and apparent density. Analytical pyrolysis was performed at 500 °C in an analytical pyrolyzer from CDS Analytical connected to a gas chromatograph coupled to the mass spectrometer (GC/MS). The pyrolysis vapors were reformed at 300 and 500 °C through thermal and catalytic cracking with zeolites (ZSM-5 and HZSM-5). It has been noticed that pyrolysis vapor reforming at 500 °C promoted partial deoxygenation and cracking reactions, while the catalytic reforming showed better results for the product deoxygenation. The catalyst reforming of pyrolysis products, especially using HZSM-5 at 500 °C, promoted the formation of monoaromatics such as benzene, toluene, xylene and styrene, which are important precursors of polymers, solvents and biofuels. The main influence on the yields of these aromatic products is due to the catalytic activity of ZSM-5 favored by increased temperature that promotes cracking reactions due expanded zeolites channels.

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“…Other alternatives for char use are as precursor for activated char (AC), fertilizers or catalysts for decomposition of NO x (Nitrogen Oxides) precursors, production of synthesis gas using CO 2 and tar reforming, etcetera [16][17][18][19][20][21][22][23][24][25]. On the side of ashes, uses are as fertilizers, construction materials, and more recently, as catalysts for some processes such as tar reforming, oxidation of nitrogen species and bio-oil upgrading [26][27][28][29][30][31][32][33]. Char can have a performance on par with commercial and expensive catalysts when used for tar reforming [34].…”

Section: Introductionmentioning

confidence: 99%

The use of gasification solid products as catalysts for tar reforming

Buentello-Montoya

Zhang

2019

Renewable and Sustainable Energy Reviews

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The presence of tars in syngas is a major technological constraint for upscaling biomass gasification to produce heat, power, and other value-added chemicals such as biofuels. At the same time, the solid remains from biomass gasification i.e. char and ashes, have capabilities to catalyse the reforming of gasification tars. This work presents a comprehensive analysis of the relevance of gasification chars and ashes as catalysts for tar reforming. A description of the solid products from biomass gasification, their formation, chemical characteristics and potential applications is given. Additionally, a review of the state of the art of the uses of regular char, activated carbon and ashes as a catalyst for tar reforming is presented. Further, kinetics reported in literature, and the homogeneous and heterogeneous mechanisms for tar reforming over char are discussed and explained. From reviewing literature it was found that activated chars exhibit the best reforming capabilities, followed by regular char and ashes. Knowing the role of the interactions between the char and the tars is a key factor for optimization of char catalysts. Ultimately, this work provides guidance for understanding the uses of biomass solids as catalysts for tar reforming, and aid in future research to increase the economic feasibility of biomass gasification.

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Catalytic upgrading of Elephant grass ( Pennisetum purpureum Schum) pyrolysis vapor using WO 3 supported on RHA and RHA-MCM-41

Cited by 25 publications

References 26 publications

In-situ Upgrading of Napier Grass Pyrolysis Vapour Over Microporous and Hierarchical Mesoporous Zeolites

In-situ Upgrading of Napier Grass Pyrolysis Vapour Over Microporous and Hierarchical Mesoporous Zeolites

Colored cotton wastes valuation through thermal and catalytic reforming of pyrolysis vapors (Py-GC/MS)

The use of gasification solid products as catalysts for tar reforming

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