Pyrolysis/gasification of pine sawdust biomass briquettes under carbon dioxide atmosphere: Study on carbon dioxide reduction (utilization) and biochar briquettes physicochemical properties

Liu, Zewei; Zhang, Fengxia; Liu, Huili; Ba, Fei; Yan, Sijia; Hu, Jianhang

doi:10.1016/j.biortech.2017.11.012

Cited by 73 publications

(18 citation statements)

References 39 publications

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“…Apart from the conventional two-step physical activation (carbonization/activation), the one-step gasification in an oxidizing gas by heating a precursor from room temperature to the desired activation temperature can also be utilized for the production of activated carbon. As an example, Liu et al [ 33 ] synthesized activated char briquette from the pine sawdust briquette at the maximum gasification temperature of 800 °C under 100% CO 2 using the one-step heating that produced the activated biochar with reasonable BET surface area of around 478 m 2 /g. However, the application of the two-step activation is more advantageous for the reason that it could effectively remove tarry materials during the first carbonization step, giving better quality char for the following activation step.…”

Section: Resultsmentioning

confidence: 99%

The Analysis of Pore Development and Formation of Surface Functional Groups in Bamboo-Based Activated Carbon during CO2 Activation

2021

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Pore development and the formation of oxygen functional groups were studied for activated carbon prepared from bamboo (Bambusa bambos) using a two-step activation with CO2, as functions of carbonization temperature and activation conditions (time and temperature). Results show that activated carbon produced from bamboo contains mostly micropores in the pore size range of 0.65 to 1.4 nm. All porous properties of activated carbons increased with the increase in the activation temperature over the range from 850 to 950 °C, but decreased in the temperature range of 950 to 1000 °C, due principally to the merging of neighboring pores. The increase in the activation time also increased the porous properties linearly from 60 to 90 min, which then dropped from 90 to 120 min. It was found that the carbonization temperature played an important role in determining the number and distribution of active sites for CO2 gasification during the activation process. Empirical equations were proposed to conveniently predict all important porous properties of the prepared activated carbons in terms of carbonization temperature and activation conditions. Oxygen functional groups formed during the carbonization and activation steps of activated carbon synthesis and their contents were dependent on the preparation conditions employed. Using Boehm’s titration technique, only phenolic and carboxylic groups were detected for the acid functional groups in both the chars and activated carbons in varying amounts. Empirical correlations were also developed to estimate the total contents of the acid and basic groups in activated carbons in terms of the carbonization temperature, activation time and temperature.

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Section: Resultsmentioning

confidence: 99%

The Analysis of Pore Development and Formation of Surface Functional Groups in Bamboo-Based Activated Carbon during CO2 Activation

2021

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“…Generally, the high heating values (HHV) of chars make them attractive sources for clean energy production instead of fossil-based solid fuels [26,27]. HHVs reported in literature for chars produced from biomass vary between 10 MJ/kg (as for seaweed derived chars [28]) and 9 33 MJ/kg (for pinewood derived chars [29]), while the HHV for coal vary between 14 and 35 MJ/kg [30].…”

Section: Energy Contents and Chemical Compositionmentioning

confidence: 99%

Biomass derived chars for energy applications

Khiari

Jeguirim

Limousy

et al. 2019

Renewable and Sustainable Energy Reviews

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Biomass-derived chars present energy density values close to those of fossil fuels and therefore they are good candidates in electricity or heat production plants with only minor drawbacks compared to fossil fuels. Even if co-firing seems the most attractive solution for near-term applications, processes based on combustion and gasification (which are competing in dependence of the need of heat or electricity) are receiving renewed attention. Thanks to their high carbon content, and their high specific surface area and developed porous structure, biomass-derived chars can be treated and converted into activated carbons and applied in many different field (as energy storage materials for gaseous fuels, mainly hydrogen and methane, or as electrodes). They can constitute the raw materials for preparing synthetic graphite, which can be used in some types of batteries and fuel cells, and in carbon electrodes for electrochemical capacitors. The performances in terms of capacitance, electrical conductivity, potential, charge and discharge rates, power density, etc. have been reported to be very close to those of commercial devices. The recent progress in the activation protocols brought to higher fuel gas storage capacities, especially in cryogenic conditions and under high pressure, and opened the possibility to apply these materials in new application fields. In catalysis, advances in the use of biomass-derived chars and active carbons have been made thanks to the improvement of the modification techniques. The optimization of the engineering methodologies allows to lower the cost of the activation processes of biomass-derived chars and to tune the char properties to adapt them to the final application. The present paper aims to give a comprehensive survey of already-well-established or future potential energy applications

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“…23,67 This is due to the combination of CO 2 and steam, promoting the cracking of tar via steam and dry reforming reactions. 39 Moreover, an enhancement in char properties (high porosity; 618 m 2 /g) results from the presence of CO 2 during pyrolysis compared to 98.4 m 2 /g in a N 2 atmosphere (Table 4) and also promotes the tar cracking/reforming process by adsorbing along the pores distributed at the surface of the char. 53,68 At a fixed S/C molar ratio of 3.4, the tar gradually decreased with the increasing CO 2 percentage in the carrier gas, i.e., from 18.3 g/Nm 3 at a CO 2 /N 2 ratio of 1:5 to 12.6 g/Nm 3 at a CO 2 /N 2 ratio of 1:1 and 11.9 g/Nm 3 at a CO 2 /N 2 ratio of 5:1, respectively (Table 8), which is similar to what is reported in the literature.…”

Section: Effect Of Comentioning

confidence: 99%

“…Recently, CO 2 has been considered as an oxidizing agent for biomass gasification to obtain high-quality syngas/H 2 production. , A number of studies were carried out using a computational model, focusing on the effects of operating conditions in the CO 2 -assisted biomass steam gasification, e.g., CO 2 concentration in the carrier gas, − CO 2 pressure, CO 2 /H 2 O ratio, − and CO 2 /C ratio , on the reaction rate, syngas properties, and process efficiency, including model validating using experimental data. However, in previous experimental studies, workers only focused on the effect of CO 2 as a single step either pyrolysis of biomass ,− or biomass char gasification ,− without providing any systematic effects and interactions among CO 2 concentration in the carrier gas, steam, and catalyst on H 2 /syngas production and gasification performance in the entire biomass gasification process. Therefore, in this study, the synergetic effect of CO 2 (CO 2 concentration), steam (steam to carbon in the feedstock molar ratio), and incorporation of catalysts (Ni/RM, Ni/HZSM-5, and Ni/Al 2 O 3 ) with a tight control of the gasification process on the properties of the product gas composition and process efficiency was investigated via two-stage gasification in which feedstock was decomposed into intermediate products (eq ) at the first stage and subsequently gasified (eqs –) at the second stage of the gasifier. …”

Section: Introductionmentioning

confidence: 99%

Sustainable Hydrogen Production from Waste Wood and CO₂

Prasertcharoensuk

Bull

Arpornwichanop

et al. 2021

Ind. Eng. Chem. Res.

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Hydrogen production from biomass gasification is potentially a competitive, more environmentally friendly route to replace steam reforming of natural gas. In this study, waste wood and CO2 were used for hydrogen production via gasification. Using CO2, greenhouse gas, as an oxidizing agent enhanced the pyrolysis-derived char reactivity 6–7 times and reduced up to 35% the phenolic derivatives in the volatiles compared to the N2 pyrolysis environment, therefore enhancing the heterogeneous gas–solid reactions and reducing the formation of tar in the producer gas. The producer gas contained up to 78 mol % H2 and with low 10 mol % CO2 when combining CO2 and stream with up to 97% process efficiency compared to 67 mol % H2, 15 mol % CO2, and less than 90% process efficiency in N2/steam gasification. A significant reduction (97%) in the amount of tar and naphthalene constituents (58%), the main component in tar in the gas stream, was observed when Ni-based red mud (a waste product of bauxite processing) was added as a catalyst in the process.

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Pyrolysis/gasification of pine sawdust biomass briquettes under carbon dioxide atmosphere: Study on carbon dioxide reduction (utilization) and biochar briquettes physicochemical properties

Cited by 73 publications

References 39 publications

The Analysis of Pore Development and Formation of Surface Functional Groups in Bamboo-Based Activated Carbon during CO2 Activation

The Analysis of Pore Development and Formation of Surface Functional Groups in Bamboo-Based Activated Carbon during CO2 Activation

Biomass derived chars for energy applications

Sustainable Hydrogen Production from Waste Wood and CO₂

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Pyrolysis/gasification of pine sawdust biomass briquettes under carbon dioxide atmosphere: Study on carbon dioxide reduction (utilization) and biochar briquettes physicochemical properties

Cited by 73 publications

References 39 publications

The Analysis of Pore Development and Formation of Surface Functional Groups in Bamboo-Based Activated Carbon during CO2 Activation

The Analysis of Pore Development and Formation of Surface Functional Groups in Bamboo-Based Activated Carbon during CO2 Activation

Biomass derived chars for energy applications

Sustainable Hydrogen Production from Waste Wood and CO2

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Sustainable Hydrogen Production from Waste Wood and CO₂