Enhanced and environment-friendly chemical looping gasification of crop straw using red mud as a sinter-resistant oxygen carrier

Shen, Xuehua; Yan, Feng; Zhang, Zhen; Li, Chunyan; Zhao, Shiyin; Zhang, Zuotai

doi:10.1016/j.wasman.2020.12.028

Cited by 54 publications

(3 citation statements)

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“…There is a broad international consensus that fossil fuel use has led to a sharp rise in CO 2 emissions, which has resulted in increasingly prominent environmental issues and global climate change. , To keep global warming below 2 °C, the Paris Accord pledged to reduce approximately 82% of global cumulative CO 2 emissions by 2050. , Carbon capture and storage (CCS) development, energy efficiency improvements, and the renewable energy utilization have been primary strategies to achieve this goal. , Renewable energy utilization and development play a vital role in both easing the energy crisis and improving environmental quality. , Among renewable energy sources, biogas generated from the anaerobic biomass digestion has been a promising renewable and clean energy. , From 2012 to 2020, global biogas usage has increased from an estimated 14.5 to 29.5 gigawatts, and the share of bio-compressed natural gas is likely to rise rapidly from 2 to 27% in the global vehicular fuel market by 2050 . Generally, raw biogas consists of CH 4 and CO 2 , which account for 50–70 vol % and 30–50 vol %, respectively .…”

Section: Introductionmentioning

confidence: 99%

Biogas Upgrading via Cyclic CO₂ Adsorption: Application of Highly Regenerable PEI@nano-Al₂O₃ Adsorbents with Anti-Urea Properties

Shen

Yan

et al. 2021

Environ. Sci. Technol.

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Solid amine adsorbents are among the most promising CO 2 adsorption technologies for biogas upgrading due to their high selectivity toward CO 2 , low energy consumption, and easy regeneration. However, in most cases, these adsorbents undergo severe chemical inactivation due to urea formation when regenerated under a realistic CO 2 atmosphere. Herein, we demonstrated a facile and efficient synthesis route, involving the synthesis of nano-Al 2 O 3 support derived from coal fly ash with a CO 2 flow as the precipitant and the preparation of polyethylenimine (PEI)-impregnated Al 2 O 3 -supported adsorbent. The optimal 55%PEI@2%Al 2 O 3 adsorbent showed a high CO 2 uptake of 139 mg•g −1 owing to the superior pore structure of synthesized nano-Al 2 O 3 support and exhibited stable cyclic stability with a mere 0.29% decay per cycle even under the realistic regenerated CO 2 atmosphere. The stabilizing mechanism of PEI@nano-Al 2 O 3 adsorbent was systematically demonstrated, namely, the cross-linking reaction between the amidogen of a PEI molecule and nano-Al 2 O 3 support, owing to the abundant Lewis acid sites of nano-Al 2 O 3 . This cross-linking process promoted the conversion of primary amines into secondary amines in the PEI molecule and thus significantly enhanced the cyclic stability of PEI@nano-Al 2 O 3 adsorbents by markedly inhibiting the formation of urea compounds. Therefore, this facile and efficient strategy for PEI@nano-Al 2 O 3 adsorbents with anti-urea properties, which can avoid active amine content dilution from PEI chemical modification, is promising for practical biogas upgrading and various CO 2 separation processes.

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Section: Introductionmentioning

confidence: 99%

Biogas Upgrading via Cyclic CO₂ Adsorption: Application of Highly Regenerable PEI@nano-Al₂O₃ Adsorbents with Anti-Urea Properties

Shen

Yan

et al. 2021

Environ. Sci. Technol.

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“…In this context, iron ores/waste and ilmenite have been widely evaluated and used for CL processes. − Brazil is one of the world’s leading producers of high-quality iron ore, solidifying its position as one of the largest global steel producers. Mill scale residue and iron spill residue (ISR) are byproducts resulting from steel production, which can be beneficiated and treated as valuable inputs contributing to the circular economy of natural resources.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Brazilian Iron-Based Ore and Industrial Waste as Low-Cost Oxygen Carriers for Chemical Looping Process

Araújo Barros do Nascimento Santiago,

de Araújo Melo,

Adánez-Rubio

et al. 2024

Energy Fuels

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Given the crucial role of oxygen carriers in advancing chemical looping (CL) technology, the innovation of this study lies in the evaluation of inexpensive and readily available materials, specifically iron ores (Carajaś iron ore, CRJ) and residues from the steel industry in Brazil [mill scale residual (MSR), iron spill residue (ISR)], as yet unexplored oxygen carriers in this process. These materials were analyzed for their chemical composition, crystalline structure, and redox properties during reactivity testing on a thermogravimetric analyzer. Among all the materials, CRJ, MSR, and ISR exhibited the highest conversions with H 2 fuel gas. Notably, CRJ displayed a higher oxygen transport capacity (R oc = 3.92) and a higher Rate Index with CH 4 (RI CHd 4 = 13,94%/min and RI air = 12,01%/min). Consequently, this material was selected for testing in the discontinuous fluidized bed reactor under CL conditions, evaluating gaseous product distribution, mass loss rates due to attrition, particle agglomeration, and carbon deposition. CRJ demonstrated excellent fuel conversion and reactivity with H 2 (H 2 > CO > CH 4 ), and the conversion increased with temperature, reaching complete combustion in the initial period of reduction at 950 °C, achieving X red = 0.113 and X ox = 0.155, indicating complete regeneration. There was no carbon deposition, low attrition loss, and a stable lifetime of 15,000 h. It also maintained reactivity under hydrogen gas without agglomeration or defluidization issues. The findings of this study carry substantial implications for upscaling CL processes utilizing low-cost materials with promising attributes.

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“…[40][41][42][43] Meanwhile, combined with economic and environmental benefits, the cost and environmental friendliness should also be considered. [44,45] Many scholars have investigated the selection of OC. Liu et al [46] used CaO-doped Fe 2 O 3 as the OC for the chemical looping co-gasification (CLCG) of pine wood and polyethylene.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Chemical Looping Co‐Gasification of Water Hyacinth and Solid Wastes

Chen

Zhong

et al. 2023

Energy Tech

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Chemical looping gasification (CLG) is a promising method to realize the resource utilization of solid waste. Chemical looping co‐gasification (CLCG) attracts much attention as it can fully utilize the synergistic effects between different types of fuels to improve the quality of gasification products. The CLCG characteristics of water hyacinth and different solid wastes, including straw, polypropylene, and sludge, are studied using lean iron ore as oxygen carriers (OCs). It is shown in the results that these solid wastes have synergistic effects on the CLG of water hyacinth to some extent. The addition of straw has a positive impact on gas production and H2/CO ratio, while the introduction of polypropylene and sludge focuses on improving gas production and H2/CO ratio, respectively. In addition, the optimal mixing ratios between water hyacinth and different solid waste are water hyacinth: straw = 50:50; water hyacinth: polypropylene 25:75; and water hyacinth: sludge = 75:25, respectively. The mixing of water hyacinth with polypropylene exhibits better gasification performance, in terms of the total gas yield of 1.27 Nm3 kg−1 and the H2/CO ratio of 1.76 at the mixing ratio of 25:75. This implies that the CLCG of biomass and polypropylene has better application prospect.

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Enhanced and environment-friendly chemical looping gasification of crop straw using red mud as a sinter-resistant oxygen carrier

Cited by 54 publications

References 50 publications

Biogas Upgrading via Cyclic CO₂ Adsorption: Application of Highly Regenerable PEI@nano-Al₂O₃ Adsorbents with Anti-Urea Properties

Biogas Upgrading via Cyclic CO₂ Adsorption: Application of Highly Regenerable PEI@nano-Al₂O₃ Adsorbents with Anti-Urea Properties

Evaluation of Brazilian Iron-Based Ore and Industrial Waste as Low-Cost Oxygen Carriers for Chemical Looping Process

Experimental Investigation on Chemical Looping Co‐Gasification of Water Hyacinth and Solid Wastes

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Enhanced and environment-friendly chemical looping gasification of crop straw using red mud as a sinter-resistant oxygen carrier

Cited by 54 publications

References 50 publications

Biogas Upgrading via Cyclic CO2 Adsorption: Application of Highly Regenerable PEI@nano-Al2O3 Adsorbents with Anti-Urea Properties

Biogas Upgrading via Cyclic CO2 Adsorption: Application of Highly Regenerable PEI@nano-Al2O3 Adsorbents with Anti-Urea Properties

Evaluation of Brazilian Iron-Based Ore and Industrial Waste as Low-Cost Oxygen Carriers for Chemical Looping Process

Experimental Investigation on Chemical Looping Co‐Gasification of Water Hyacinth and Solid Wastes

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Product

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Biogas Upgrading via Cyclic CO₂ Adsorption: Application of Highly Regenerable PEI@nano-Al₂O₃ Adsorbents with Anti-Urea Properties

Biogas Upgrading via Cyclic CO₂ Adsorption: Application of Highly Regenerable PEI@nano-Al₂O₃ Adsorbents with Anti-Urea Properties