Online catalytic deoxygenation of vapour from fast pyrolysis of Vietnamese sugarcane bagasse over sodium-based catalysts

Nguyen, Tang Son; Duong, Thanh Long; Pham, Trung Thanh; Nguyen, Dong Truc; Le, Phuc Nguyen; Nguyen, Huu Luong; Huynh, Thuan Minh

doi:10.1016/j.jaap.2017.07.006

Cited by 8 publications

(4 citation statements)

References 38 publications

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“…TiO 2 , ZrO 2 , and CeO 2 catalysts are amphoteric and have a high activity for ketonization. − The different crystal phases of TiO 2 , i.e., anatase, rutile, or brookite, impact the catalyst performance in the gas-phase ketonization of carboxylic acids such as acetic acid and propionic acid, and rutile TiO 2 was found to perform best when comparing the activity normalized by surface area . TiO 2 was also found effective in defunctionalizing monomeric methoxy phenolics from lignin into simple phenols, and deoxygenation of whole biomass pyrolysis vapors. ,, Also MnO 2 and La 2 O 3 were found to be active in ketonization. , CFP with ZnO showed only minor improvement of the viscosity and stability of the produced oils. , Besides investigations of impregnating alkali compounds (NaOH, KOH, Na 2 CO 3 , K 2 CO 3 , KC 2 H 3 O 2 , and NaCl) directly into biomass, Na 2 CO 3 supported on γ-Al 2 O 3 or silica–alumina was investigated in ex-situ CFP and found to be highly active for reduction of the acids via ketonization. ,,− …”

Section: Catalytic Fast Pyrolysismentioning

confidence: 99%

A Review of Recent Research on Catalytic Biomass Pyrolysis and Low-Pressure Hydropyrolysis

2021

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Direct catalytic upgrading of biomass-derived fast pyrolysis vapors can occur in different process configurations, under either inert or hydrogen-containing atmospheres. This review summarizes the myriad of different catalysts studied and benchmarks their deoxygenation performance by also taking into account the resulting decrease in bio-oil yield compared to a thermal pyrolysis oil. Generally, catalyst modifications aim at improving the initial selectivity of the catalyst to more desirable oxygen-free hydrocarbons and/or improving the catalysts’ stability against deactivation by coking. Optimizing the pore structure and acid site density/distribution of solid acid catalysts can slow down deactivation and prolong activity. Basic catalysts such as MgO and Na2O/γ-Al2O3 are excellent ketonization catalysts favoring oxygen removal via decarboxylation, whereas solid acid catalysts such as zeolites primarily favor decarbonylation and dehydration. Basic catalysts can therefore produce bio-oils with higher H/C ratios. However, since their coke formation per surface area is higher, compared to a microporous HZSM-5 zeolite, precoking (or imperfect regeneration) of these basic catalysts and operating for longer time-on-stream can be approaches to improve the oil yield. In-line vapor-phase upgrading with a dual bed comprising a solid acid catalyst followed by a basic catalyst active in ketonization and aldol condensation further improves deoxygenation while maintaining high bio-oil carbon recovery. Also low-cost catalysts such as iron-rich red mud have deoxygenation activity. An improved bio-oil carbon recoverycompared at a similar level of oxygen removalcan be obtained when changing from an inert atmosphere to a hydrogen-containing atmosphere and using an effective hydrodeoxygenation (HDO) catalyst. To keep costs low, this can be conducted at near-atmospheric pressure conditions. Pt/TiO2 and MoO3/TiO2 showed high activity and reduced coke formation. Stable performance has been demonstrated using Pt/TiO2 for 100+ reaction/regeneration cycles with woody biomass feedstock. If future works can demonstrate the same durability for lower-cost biomass containing higher contents of ash, N, and S, this would considerably boost the commercial viability of near-atmospheric pressure HDO. Further research should be directed to testing the durability of lower-cost HDO catalysts such as MoO3/TiO2 and further improving the activity and stability of lower-cost catalysts.

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Section: Catalytic Fast Pyrolysismentioning

confidence: 99%

A Review of Recent Research on Catalytic Biomass Pyrolysis and Low-Pressure Hydropyrolysis

2021

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“…cracking catalyst such as HZSM-5 [36][37][38][39][40][41][42][43], or with other materials such as red mud [44] and alumina based catalysts [45,46]. As this review deals with catalytic HDO and coupling of fast pyrolysis with HDO, catalytic pyrolysis with non-HDO catalysts and upgrading of pyrolysis oil with zeolites without hydrogen in the gas phase is outside the scope of this review.…”

Section: Fast Pyrolysis Of Biomassmentioning

confidence: 99%

Transportation fuels from biomass fast pyrolysis, catalytic hydrodeoxygenation, and catalytic fast hydropyrolysis

Dabros¹,

Stummann²,

Høj³

et al. 2018

Progress in Energy and Combustion Science

221

147

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“…3). Nguyen et al [51] found the deoxygenation activity of the 25 wt.%Na 2 CO 3 /γ-Al 2 O 3 catalyst comparable to HZSM-5 (Si/Al ~ 15), albeit the Na-Al 2 O 3 catalyst showed a higher coke yield (4.1 wt.%) compared to HZSM-5 (2.3 wt.%) and a lower yield of organic fraction (26.2 wt.% vs. 27.8 wt.%). Fig.…”

Section: Catalyst Stabilitymentioning

confidence: 99%

“…and TAN of the oil decreased from 42 wt.% O and 119 mg KOH/g to 12 wt.% O and 4 mg KOH/g, respectively. In a later work, Nguyen et al [51] tested different Na 2 CO 3 loadings on an alumina support. FP vapors from sugarcane bagasse were generated in a fluidized-bed reactor (100 g/h feeding rate) and upgraded over a fixed bed of 20 g catalyst.…”

Section: Introductionmentioning

confidence: 99%

Deoxygenation of wheat straw fast pyrolysis vapors over Na-Al2O3 catalyst for production of bio-oil with low acidity

Eschenbacher

Saraeian

Jensen

et al. 2020

Chemical Engineering Journal

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Online catalytic deoxygenation of vapour from fast pyrolysis of Vietnamese sugarcane bagasse over sodium-based catalysts

Cited by 8 publications

References 38 publications

A Review of Recent Research on Catalytic Biomass Pyrolysis and Low-Pressure Hydropyrolysis

A Review of Recent Research on Catalytic Biomass Pyrolysis and Low-Pressure Hydropyrolysis

Transportation fuels from biomass fast pyrolysis, catalytic hydrodeoxygenation, and catalytic fast hydropyrolysis

Deoxygenation of wheat straw fast pyrolysis vapors over Na-Al2O3 catalyst for production of bio-oil with low acidity

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