Selective preparation of furfural via the pyrolysis of cellulose catalyzed with nitrided HZSM-5

Furfural is a high-value compound that can be prepared by catalytic pyrolysis of biomass. In order to improve the selectivity of furfural in the process of cellulose catalytic pyrolysis, the ammonia-modified HZSM-5 (N-HZSM-5) was used as the catalyst for experimental research on a horizontal fixed bed. The effects of different nitriding temperatures and times on N-HZSM-5, and the effects of different catalyst to cellulose (CA to CL) ratios on furfural selectivity were evaluated. The results showed that N-HZSM-5 can effectively improve the selectivity for furfural. At the optimal conditions (nitriding temperature: 800 °C, nitriding time: 6 h, CA to CL ratio: 4), the selectivity of furfural was up to 24%, which was much higher than those of noncatalytic pyrolysis (1.2%) and HZSM-5 catalytic pyrolysis (3.6%). In order to better evaluate the performance of the catalyst, a series of characterizations were carried out on the N-HZSM-5. The results showed that compared with HZSM-5, N-HZSM-5 had an increased pore size, it was less acidic, and it had more uniform surface acidity. It was conducive to the selective formation of furfural. Therefore, the ammonia-modification can effectively control the structure and acidity of HZSM-5, and N-HZSM-5 exhibits a non-negligible potential in catalyzing the pyrolysis of cellulose for furfural.

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Hydrogen production via catalytic pyrolysis of biomass in a two-stage fixed bed reactor system

International Journal of Hydrogen Energy ◽

10.1016/j.ijhydene.2014.06.158 ◽

2014 ◽

Vol 39 (25) ◽

pp. 13128-13135 ◽

Cited By ~ 38

Author(s):

Shaomin Liu ◽

Jinglin Zhu ◽

Mingqiang Chen ◽

Wenping Xin ◽

Zhonglian Yang ◽

...

Keyword(s):

Hydrogen Production ◽

Catalytic Pyrolysis ◽

Fixed Bed ◽

Reactor System ◽

Fixed Bed Reactor ◽

Two Stage ◽

Pyrolysis Of Biomass

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Review of Reactor and Catalyst in the Pyrolysis of Biomass for Liquid Fuels

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.512-515.552 ◽

2012 ◽

Vol 512-515 ◽

pp. 552-557

Author(s):

Xiao Xiong Zhang ◽

Guan Yi Chen ◽

Yi Wang

Keyword(s):

Alternative Fuels ◽

Catalytic Pyrolysis ◽

Fixed Bed ◽

Fixed Bed Reactor ◽

Liquid Fuels ◽

Thermochemical Conversion ◽

Renewable Energy Resources ◽

Bio Oil ◽

Pyrolysis Of Biomass

Due to the rapid growth of energy consumption, fossil-based fuel is at the verge of extinction. Hence, the world needs new energy to substitute for the non-renewable energy resources. Various biomass resources have been discussed by virtue of the ability of generating alternative fuels, chemicals and energy-related products. To date, the utilization of biomass is mainly thermochemical conversion which involves combustion, gasification and pyrolysis. The focus, currently, is on the catalytic pyrolysis of biomass. A variety of reactors are designed and many new catalysts for the yields of liquid products and upgrading of bio-oil are investigated. Different reactors have their own unique characteristics, and fixed bed reactor is not complicated and can be controlled easily but is difficult to upsize. Fluidized bed has a good suitability for different kinds of biomass but is more complex in structure and more difficult to control. Compared with non-catalytic pyrolysis, the quality of bio-oil improves considerably in the presence of a catalyst. Different catalysts exert different effects on the upgrading of bio-oil. HZSM-5 can reduce a vast output of acid compounds and increases hydrocarbon yields. Au/Al2O3 catalyst leads to an increase of H2 yield. All the catalysts can promote the upgrading of pyrolysis products. Optimal yields and the best quality of bio-oil can be obtained by an appropriate reactor with a proper catalyst.

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Steam Gasification of Catalytic Pyrolysis Char for Hydrogen-Rich Gas Production

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.316-317.105 ◽

2013 ◽

Vol 316-317 ◽

pp. 105-108

Author(s):

Wu Xing Sun ◽

Yan Zhou ◽

Qi Wang ◽

Shu Rong Wang

Keyword(s):

Atmospheric Pressure ◽

Catalytic Pyrolysis ◽

Fixed Bed ◽

Gas Production ◽

Steam Gasification ◽

Fixed Bed Reactor ◽

Bed Temperature ◽

Production Of Hydrogen ◽

Pyrolysis Of Biomass ◽

Gasification Temperature

Steam gasification of biochar from catalytic pyrolysis of biomass was studied in a fixed bed reactor at atmospheric pressure. The experiments were carried out at bed temperature of 700, 750, 800 °C at steam flow rate of 0.1 g/min with reaction time of 3h. The gases produced included mainly H2, CO, CO2 and some small molecular hydrocarbons. The results showed that high gasification temperature was favorable for the production of hydrogen-rich gases. The maximum concentration of hydrogen exceeded 85% at 800 °C and the total gas yield increased with temperature rising. Meanwhile, the conversion efficiency of biochar at 700, 750, 800 °C was 48%, 60%, 72% respectively.

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Regulating light olefins or aromatics production in ex-situ catalytic pyrolysis of biomass by engineering the structure of tin modified ZSM-5 catalyst

Bioresource Technology ◽

10.1016/j.biortech.2021.124975 ◽

2021 ◽

pp. 124975

Author(s):

Jingyuan Shang ◽

Guangbin Fu ◽

Zhenping Cai ◽

Xiang Feng ◽

Yongxiao Tuo ◽

...

Keyword(s):

Catalytic Pyrolysis ◽

Ex Situ ◽

Light Olefins ◽

Pyrolysis Of Biomass

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Effect of Ni(NO3)2 Pretreatment on the Pyrolysis of Organsolv Lignin Derived from Corncob Residue

Processes ◽

10.3390/pr9010023 ◽

2020 ◽

Vol 9 (1) ◽

pp. 23

Author(s):

Wenli Wang ◽

Yichen Liu ◽

Yue Wang ◽

Longfei Liu ◽

Changwei Hu

Keyword(s):

Sustainable Development ◽

Fixed Bed ◽

Value Added ◽

Bio Oil ◽

Fuels And Chemicals ◽

Gas Products ◽

Work Samples ◽

Nickel Species ◽

The Impact ◽

Selective Formation

The thermal degradation of lignin for value-added fuels and chemicals is important for environment improvement and sustainable development. The impact of pretreatment and catalysis of Ni(NO3)2 on the pyrolysis behavior of organsolv lignin were studied in the present work. Samples were pyrolyzed at 500 ∘C with an upward fixed bed, and the characteristics of bio-oil were determined. After pretreatment by Ni(NO3)2, the yield of monophenols increased from 23.3 wt.% to 30.2 wt.% in “Ni-washed” and decreased slightly from 23.3 wt.% to 20.3 wt.% in “Ni-unwashed”. Meanwhile, the selective formation of vinyl-monophenols was promoted in “Ni-unwashed”, which indicated that the existence of nickel species promoted the dehydration of C-OH and breakage of C-C in pyrolysis. In comparison with “Water”, HHV of bio-oil derived from “Ni-unwashed” slightly increased from 27.94 mJ/kg to 28.46 mJ/kg, suggesting that the lowering of oxygen content in bio-oil is associated with improved quality. Furthermore, the content of H2 in gas products dramatically increased from 2.0% to 7.6% and 17.1%, respectively.

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