A critical review on co-hydrothermal carbonization of biomass and fossil-based feedstocks for cleaner solid fuel production: Synergistic effects and environmental benefits

Fakudze, Sandile; Chen, Jianqiang

doi:10.1016/j.cej.2022.141004

Cited by 54 publications

(9 citation statements)

References 96 publications

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“…Overall, thermochemical treatment profoundly improved the energy density of SCGs. [27], as depicted in Figure 1. Clearly, slow pyrolysis biochar falls within the region of coal and can be considered as a solid biofuel with comparable quality to coal.…”

Section: Properties Related To Energy Applicationmentioning

confidence: 99%

Exploring the Properties and Potential Uses of Biocarbon from Spent Coffee Grounds: A Comparative Look at Dry and Wet Processing Methods

Yang

Zhao

et al. 2023

Processes

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Coffee is among the most widely consumed beverages worldwide, leading to the annual generation of substantial quantities of spent coffee grounds (SCGs). This study explored the influence of fabrication methods on the properties and potential applications of the resulting biocarbon materials. Dry methods (torrefaction at 270 °C and slow pyrolysis at 500 °C) and wet methods (hydrothermal carbonization HTC at 210 °C and hydrothermal liquefaction HTL at 270 °C) were employed to fabricate SCG-based biochar and hydrochar, respectively. The carbonization degree followed the order of slow pyrolysis > HTL > HTC ≈ torrefaction, yielding significant differences in energy properties, elemental composition, morphology, and surface functionality. Slow pyrolysis biochar was suitable for energy applications due to a similar fuel ratio as and higher heating value than semianthracite coal. For agricultural applications, SCG biochar produced through dry methods could be utilized to mitigate acidic soil conditions, whereas HTC hydrochar, with its elevated surface area and porosity, could enhance soil microbiological diversity and water-holding capacity, as well as benefit environmental applications such as wastewater remediation. In summary, the findings of this study are anticipated to inform decision-making processes concerning sustainable waste management of SCGs and the exploration of carbon-based materials applications across diverse sectors.

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Section: Properties Related To Energy Applicationmentioning

confidence: 99%

Exploring the Properties and Potential Uses of Biocarbon from Spent Coffee Grounds: A Comparative Look at Dry and Wet Processing Methods

Yang

Zhao

et al. 2023

Processes

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“…Most studies have reported that co-HTC treatment can enhance the carbon content of hydrochar, increase its solid yield, and yield higher heating values (HHVs), as well as provide higher dechlorination/desulfurization efficiency when compared to a single feedstock. HTC is an elaborate thermochemical process dealing with many reaction mechanisms and pathways that result in changes in the chemical and structural compositions of hydrochar, as reported by Xue Y. et al and Fakudze S. et al [18][19][20]. Microwave-assisted HTC is also a new way of addressing the limitations associated with the traditional HTC methods, such as heat loss, uncontrolled side reactions, and non-selective heating.…”

Section: Introductionmentioning

confidence: 99%

A Review of Upscaling Hydrothermal Carbonization

Ho,

Nadeem,

Choe

2024

Energies

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Hydrothermal carbonization (HTC) has recently emerged as a promising technology for converting diverse forms of waste with a high moisture content into value-added products such as biofuel, biochar, and activated carbon. With an increasing demand for sustainable and carbon-neutral energy sources, HTC has attracted considerable attention in the literature. However, a successful transition from laboratory-scale to large-scale industrial applications entails notable challenges. This review critically assesses the upscaling of hydrothermal carbonization processes, emphasizing the challenges, innovations, and environmental implications associated with this transition. The challenges inherent in upscaling HTC are comprehensively discussed, including aspects such as reactor design, process optimization, and the current treatment technology for process water. This review presents recent innovations and technological advancements that address these challenges and explores integrated solutions to enhancing hydrothermal carbonization’s scalability. Additionally, this review highlights key companies that have developed and implemented HTC plants for commercial purposes. By overcoming the obstacles and achieving advancements in the upscaling of hydrothermal carbonization, this review contributes to the ongoing efforts to realize the full potential of HTC as a sustainable and scalable biomass conversion technology and proposes future directions.

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“…Despite the development of electric cars, today the vast majority of vehicles continue to run on hydrocarbon fuels obtained from fossil resources. 1,2 Therefore, the challenge of minimizing the negative impact of fuels on the environment today not only remains but also increases its relevance due to the constant increase in transport and growth in fuel consumption. Desulfurization is one of the basic and fundamental oil refining processes aimed at obtaining petroleum products and fuels with low sulfur content.…”

Section: Introductionmentioning

confidence: 99%

“…Despite the development of electric cars, today the vast majority of vehicles continue to run on hydrocarbon fuels obtained from fossil resources. , Therefore, the challenge of minimizing the negative impact of fuels on the environment today not only remains but also increases its relevance due to the constant increase in transport and growth in fuel consumption. Desulfurization is one of the basic and fundamental oil refining processes aimed at obtaining petroleum products and fuels with low sulfur content. − This process is one of the key stages in the production of fuels for internal combustion engines that meet the most stringent environmental standards. − Given that sulfur compounds form the most toxic products during the combustion of motor fuels, − special attention is drawn to the reduction of sulfur content to a minimum in all types of fuels for internal combustion engines diesel, , gasoline, and marine fuels. − …”

Section: Introductionmentioning

confidence: 99%

New Approach to Ultrafast Oxidative Desulfurization in the Presence of Sulfated Alumina-Based Catalysts

Akopyan,

Arzyaeva,

Mustakimov

et al. 2024

Energy Fuels

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Simple and highly efficient catalysts obtained by modifying aluminum oxide with sulfuric acid and molybdenum oxide were applied in the process of oxidative desulfurization of model and real diesel fuels. The sequence of modification of the support strongly influences both the chemical composition and acidity of the catalyst. When establishing the correlation between the acidic properties and the content of molybdenum oxide active species, it was shown that the decisive factor influencing the activity of the catalyst is the number of acid sites responsible for the coordination of sulfur-containing substrates. The catalysts were characterized by XRD, nitrogen adsorption−desorption, SEM, TEM, temperature-programmed desorption of ammonia, and X-ray fluorescence. Under optimal conditions of 1.0 wt % of catalyst, a H 2 O 2 /S molar ratio of 4:1, and T = 80 °C, dibenzothiophene was completely oxidized in just 5 min. The 99.9% efficiency of the synthesized S/Mo/Al 2 O 3 catalyst in oxidative desulfurization of the sulfur-rich real diesel fuel (10 100 ppm) in the production of ultralow sulfur diesel was demonstrated in two-step oxidation (5 wt % of catalyst, H 2 O 2 /S molar ratio of 2:1, T = 80 °C).

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A critical review on co-hydrothermal carbonization of biomass and fossil-based feedstocks for cleaner solid fuel production: Synergistic effects and environmental benefits

Cited by 54 publications

References 96 publications

Exploring the Properties and Potential Uses of Biocarbon from Spent Coffee Grounds: A Comparative Look at Dry and Wet Processing Methods

Exploring the Properties and Potential Uses of Biocarbon from Spent Coffee Grounds: A Comparative Look at Dry and Wet Processing Methods

A Review of Upscaling Hydrothermal Carbonization

New Approach to Ultrafast Oxidative Desulfurization in the Presence of Sulfated Alumina-Based Catalysts

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