Hydrogen-rich syngas production with tar elimination via biomass chemical looping gasification (BCLG) using BaFe2O4/Al2O3 as oxygen carrier

Yan, Jingchun; Sun, Rong; Shen, Laihong; Bai, Hongcun; Jiang, Shouxi; Xiao, Yan; Song, Tao

doi:10.1016/j.cej.2020.124107

Cited by 87 publications

(36 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although materials based on Fe as the only active phase have been studied, 16 , 18 , 20 , 24 − 26 the use of bimetallic compounds based on mixtures of Fe, Ni, Cu, and Ba has also been analyzed to improve the efficiency of the process. 19 , 27 − 30 However, most of these materials have only been tested in batch reactors. Working in continuous units, synthetic Fe 2 O 3 /Al 2 O 3 oxygen carriers were used by Huseyin et al 20 and Wei et al 18 in a 10 kW th unit and Sampron et al.…”

Section: Introductionmentioning

confidence: 99%

Syngas Production in a 1.5 kW_th Biomass Chemical Looping Gasification Unit Using Fe and Mn Ores as the Oxygen Carrier

et al. 2021

View full text Add to dashboard Cite

Biomass chemical looping gasification (BCLG) uses lattice oxygen from an oxygen carrier instead of gaseous oxygen for high-quality syngas production without CO 2 emissions. In this work, the effect of the main operating variables, such as oxygen/biomass ratio (λ), gasification temperature, and steam/biomass ratio (S/B), was investigated using two low-cost materials: a Fe ore and a Mn ore. Oxygen fed to the air reactor for oxidation was used as an effective method for controlling the amount of lattice oxygen used for syngas production. The main variable that affected the process performance and the syngas quality was λ, while the fuel reactor temperature and the S/B ratio had a minor effect. Small performance differences found between the ores can be attributed to different degrees of CH 4 and light hydrocarbons reforming in the process. The CO 2 content in the syngas was high (40 −43%) under autothermal conditions because the gasification reactions required the heat to be generated by combustion. CH 4 contents of around 10% were found in syngas, coming from the unburned or unreformed volatiles. Syngas yields around 0.60 Nm 3 /kg of dry biomass were found for both ores. Additionally, high biomass conversions ( X b > 94%) and carbon conversion efficiencies (η cc > 95%) were obtained in all cases, showing the capability of the process of avoiding CO 2 emissions to the atmosphere. No agglomeration was found in the bed during the BCLG process, although attrition rates were high, leading to lifetimes of 160 and 300 h for the manganese and iron ores, respectively. Migration of Fe or Mn to the external part of the particle, generating a metal concentrated shell, was observed. Its detachment was responsible for the decrease in the oxygen transport capacity ( R OC ) of the material with the operating time and the reduced lifetime. The results obtained here allowed the iron ore to be considered as an oxygen carrier suitable for the BCLG process.

show abstract

Section: Introductionmentioning

confidence: 99%

Syngas Production in a 1.5 kW_th Biomass Chemical Looping Gasification Unit Using Fe and Mn Ores as the Oxygen Carrier

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Additionally, the endothermic reaction ( 14) was inhibited by a high temperature, which led to the decreasing of CO 2 . 16 This indicated that high temperatures were favorable for generating syngas with high calorific values. In addition, the OC presented poor reactivity under low temperatures, leading to limited carbon conversion and syngas products.…”

Section: Effect Of Reaction Temperaturementioning

confidence: 99%

“…It is due to the higher quantity of oxygen carriers that would promote the oxidation reactions of combustible gases including H 2 and CO. Alternatively, a high amount of OC results in a higher gasification temperature, which enhances the gasification and improves the quality of the product gas to some extent. 16,17 The resource usage of WAC to produce synthesis gas would be achieved through CLG by opening a broader means for treating carbonaceous solid wastes. This work aims to verify the feasibility of iron-based OCs for the treatment of WAC in CLG, focusing on macroscopic research combined with various analytical methods.…”

Section: Introductionmentioning

confidence: 99%

Syngas Production by Chemical-Looping Gasification of Waste Activated Carbon with Iron-Based Oxygen Carrier

et al. 2022

Fine Chemical Engineering

View full text Add to dashboard Cite

Waste Activated Carbon (WAC), as a typical solid waste, can be utilized by Chemical-Looping Gasification (CLG) technology with an iron-based Oxygen Carrier (OC) to produce valuable synthesis gas. A series of experiments on WAC of the CLG process has been performed in a fixed-bed reactor. The operation parameters and cyclic performance of the iron-based OC have been investigated during CLG reactions. Fresh and cyclic reaction OC samples have been analyzed by X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). To obtain high-quality syngas with high carbon conversion, the optimal OC/WAC mole ratio, steam flow rate and reaction temperature are 0.1, 0.10 mL/min, and 950 °C, respectively. The iron-based OC exhibits a stable cyclic performance during multiple tests, following the reaction path of Fe2O3 to Fe0.98O in the individual reduction process. Moreover, the iron-based OC is oxidized to almost its initial state after 10 redox tests without obvious sintering and agglomeration phenomena. The WAC of CLG provides a new approach to the comprehensive usage of solid waste, especially with low volatile feedstock.

show abstract

“…The synergic effect between Ni, activated carbon and CaO are shown below. Typical reactions occurring in the reforming stage are also listed below (Abdelouahed et al, 2012;Yan et al, 2020).…”

Section: Working Principle Of Catalyst Ni-cao-cmentioning

confidence: 99%

Experimental study on pyrolysis/gasification of biomass and plastics for H2 production under new dual-support catalyst

Chai

Wang

Gao

et al. 2020

Chemical Engineering Journal

112

View full text Add to dashboard Cite

Energy security and environmental pollution are two major concerns worldwide. H2 from pyrolysis/gasification of biomass and waste plastics is a clean energy source. However, relatively low yield and composition of H2 is produced using this technology, thus preventing its commercialisation. Catalyst is key to promote H2 production. This paper aims to explore whether newly developed dual-support catalyst Ni-CaO-C can catalyse gasification of volatiles from pyrolysis of different plastics (e.g. high density polyethylene -HDPE, polypropylene -PP and polystyrene -PS) and biomass (e.g. pine sawdust) for H2 production. Experiments with and without catalysts were performed to test the performance of catalyst Ni-CaO-C. Impact of changing operating conditions (i.e. feedstock ratio, reforming temperature and water injection flowrate) on H2 production were also investigated. Results show that catalysts (Ni-Al2O3 or Ni-CaO-C) can effectively promote H2 production. The H2 production using catalyst Ni-CaO-C is much better than catalyst Ni-Al2O3. The catalytic effect of Ni-CaO-C rank in the sequence of HDPE > PP > PS. Plastic content in feedstock is suggested to be less than 40 wt% (for HDPE and PP) and 30 wt% (for PS) when mixing with biomass to reach high H2 production. When the feedstock ratio is constant, high H2 yield (i.e. 80.36 mmol/g) is achieved under relatively 2 low reforming temperature at 700 °C and water injection flowrate at 5 mL/h. However, under the same conditions, PP and PS only have H2 yields at 59.35 mmol/g and 38.51 mmol/g. PS requires even higher temperature (800°C) and water injection flowrate (10 mL/h) to ensure acceptable H2 yields. The new findings presented in this paper can help large scale commercial application of pyrolysis/gasification technologies for biomass and waste plastics.

show abstract

Hydrogen-rich syngas production with tar elimination via biomass chemical looping gasification (BCLG) using BaFe2O4/Al2O3 as oxygen carrier

Cited by 87 publications

References 47 publications

Syngas Production in a 1.5 kW_th Biomass Chemical Looping Gasification Unit Using Fe and Mn Ores as the Oxygen Carrier

Syngas Production in a 1.5 kW_th Biomass Chemical Looping Gasification Unit Using Fe and Mn Ores as the Oxygen Carrier

Syngas Production by Chemical-Looping Gasification of Waste Activated Carbon with Iron-Based Oxygen Carrier

Experimental study on pyrolysis/gasification of biomass and plastics for H2 production under new dual-support catalyst

Contact Info

Product

Resources

About

Hydrogen-rich syngas production with tar elimination via biomass chemical looping gasification (BCLG) using BaFe2O4/Al2O3 as oxygen carrier

Cited by 87 publications

References 47 publications

Syngas Production in a 1.5 kWth Biomass Chemical Looping Gasification Unit Using Fe and Mn Ores as the Oxygen Carrier

Syngas Production in a 1.5 kWth Biomass Chemical Looping Gasification Unit Using Fe and Mn Ores as the Oxygen Carrier

Syngas Production by Chemical-Looping Gasification of Waste Activated Carbon with Iron-Based Oxygen Carrier

Experimental study on pyrolysis/gasification of biomass and plastics for H2 production under new dual-support catalyst

Contact Info

Product

Resources

About

Syngas Production in a 1.5 kW_th Biomass Chemical Looping Gasification Unit Using Fe and Mn Ores as the Oxygen Carrier

Syngas Production in a 1.5 kW_th Biomass Chemical Looping Gasification Unit Using Fe and Mn Ores as the Oxygen Carrier