Investigation of the role of Ca(OH)2 in the catalytic Alkaline Thermal Treatment of cellulose to produce H2 with integrated carbon capture

Stonor, Maxim R.; Ouassil, Nicholas; Chen, Jingguang G.; Park, Ah‐Hyung Alissa

doi:10.1016/j.jechem.2017.07.013

Cited by 21 publications

(24 citation statements)

References 31 publications

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“…The concept of using a base in the ATT reaction scheme can be analogous to the role of the OH − ion from dissociated water in SCW 34,35 . Recent studies have demonstrated that the presence of NaOH in the ATT reaction greatly enhances H 2 production from model biomass compounds such as glucose and cellulose under moderate reaction conditions (<500°C) while capturing carbon in the form of solid carbonates [34][35][36][37][38][39][40] . The main differences between ATT and SCW/steam gasification include its relatively low reaction temperature and pressure, as well as a tolerance to salt and moisture.…”

Section: Resultsmentioning

confidence: 99%

Alkaline thermal treatment of seaweed for high-purity hydrogen production with carbon capture and storage potential

2020

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Current thermochemical methods to generate H 2 include gasification and steam reforming of coal and natural gas, in which anthropogenic CO 2 emission is inevitable. If biomass is used as a source of H 2 , the process can be considered carbon-neutral. Seaweeds are among the less studied types of biomass with great potential because they do not require freshwater. Unfortunately, reaction pathways to thermochemically convert salty and wet biomass into H 2 are limited. In this study, a catalytic alkaline thermal treatment of brown seaweed is investigated to produce high purity H 2 with substantially suppressed CO 2 formation making the overall biomass conversion not only carbon-neutral but also potentially carbon-negative. High-purity 69.69 mmol-H 2 /(dry-ash-free)g-brown seaweed is produced with a conversion as high as 71%. The hydroxide is involved in both H 2 production and in situ CO 2 capture, while the Ni/ZrO 2 catalyst enhanced the secondary H 2 formation via steam methane reforming and water-gas shift reactions.

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Section: Resultsmentioning

confidence: 99%

Alkaline thermal treatment of seaweed for high-purity hydrogen production with carbon capture and storage potential

2020

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“…For the second peak, gas phase reforming became more significant and this step was mainly controlled by mass transfer limitation through the material pores. 20,35 Therefore, the lowest second peak was obtained in case 1Cel-6Ca-4Ni, because it has the lowest specific surface area (3.6 m 2 •g −1 for 1.5Ca-1Ni). Based on Figure 5d, the total H 2 yield followed the order of 1Cel-6Ca-4Ni < 1Cel-6Ca-1Ni < 1Cel-6Ca-2Ni.…”

Section: Effects Of Molar Ratio Of Cellulose To Ca(oh) 2 On Hmentioning

confidence: 95%

“…100% yield of H 2 was obtained by adding nickel-based catalyst to suppress the formation of methane. So far, group I hydroxides (i.e., NaOH, KOH and LiOH) − and group II hydroxides (i.e., Ca(OH) 2 and Mg(OH) 2 ) , have been investigated in ATT of biomass. Stonor et al found comparable H 2 production performance could be achieved when using Ca(OH) 2 with the assistance of nickel-based catalysts instead of NaOH to treat cellulose.…”

Section: Introductionmentioning

confidence: 99%

Alkaline Thermal Treatment of Cellulosic Biomass for H₂ Production Using Ca-Based Bifunctional Materials

Zhao

Cui

et al. 2018

ACS Sustainable Chem. Eng.

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Hydrogen production from cellulosic biomass not only provides a sustainable approach to cope with the growing demand for energy but also facilitates the relief of environmental burden. In this study, we developed a series of Ca-based bifunctional materials (Ca(OH) 2 and Ni composites) for alkaline thermal treatment (ATT) of cellulose to produce high purity hydrogen at moderate temperatures (350−450 °C). Ca(OH) 2 served predominantly as a CO 2 carrier and a H 2 O donor, and enlarged the surface area of the materials to improve H 2 production. However, excess Ca(OH) 2 tended to cover Ni particles and block pore structures resulting in a suppressed H 2 production. Ni promoted tar cracking and enhanced H 2 production, but the surface area of catalyst decreased with an increment in Ni, which suppressed H 2 generation. The yield of hydrogen was improved at elevated temperature. The maximum hydrogen yield, 34.5 mmol•g −1 with 77% volume fraction, was obtained by adopting a molar ratio of cellulose:Ca(OH) 2 :Ni as 1:6:2 at 450 °C for 10 min. GC−MS analysis results of tar products revealed that Ca(OH) 2 promoted primary pyrolysis of cellulose, and Ni promoted the decomposition of furan ring derivatives. The reaction temperature affected the distribution rather than the composition of the tar products.

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“…in the presence of Ni/ZrO 2 catalyst 26 . As opposed to generating oxides and hydroxides of Ca and Mg from carbonates, alternative routes of synthesizing these materials from silicate precursors need to be investigated.…”

Section: Biomass Oxygenatementioning

confidence: 99%

Carbon mineralization pathways for carbon capture, storage and utilization

Gadikota

2021

Commun Chem

115

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Carbon mineralization is a versatile and thermodynamically downhill process that can be harnessed for capturing, storing, and utilizing CO 2 to synthesize products with enhanced properties. Here the author discusses the advances in and challenges of carbon mineralization, and concludes that tuning the chemical interactions involved will allow us to unlock its potential for advancing low carbon energy and resource conversion pathways.

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Investigation of the role of Ca(OH)2 in the catalytic Alkaline Thermal Treatment of cellulose to produce H2 with integrated carbon capture

Cited by 21 publications

References 31 publications

Alkaline thermal treatment of seaweed for high-purity hydrogen production with carbon capture and storage potential

Alkaline thermal treatment of seaweed for high-purity hydrogen production with carbon capture and storage potential

Alkaline Thermal Treatment of Cellulosic Biomass for H₂ Production Using Ca-Based Bifunctional Materials

Carbon mineralization pathways for carbon capture, storage and utilization

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Investigation of the role of Ca(OH)2 in the catalytic Alkaline Thermal Treatment of cellulose to produce H2 with integrated carbon capture

Cited by 21 publications

References 31 publications

Alkaline thermal treatment of seaweed for high-purity hydrogen production with carbon capture and storage potential

Alkaline thermal treatment of seaweed for high-purity hydrogen production with carbon capture and storage potential

Alkaline Thermal Treatment of Cellulosic Biomass for H2 Production Using Ca-Based Bifunctional Materials

Carbon mineralization pathways for carbon capture, storage and utilization

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Alkaline Thermal Treatment of Cellulosic Biomass for H₂ Production Using Ca-Based Bifunctional Materials