Carbon Resources Conversion最新文献

英文中文

Optimizing bioethanol production from sweet sorghum stem juice under very high gravity fermentation and temperature stress conditions

IF 6.4 3区环境科学与生态学 Q2 ENERGY & FUELS

Carbon Resources Conversion

Pub Date : 2024-08-30 DOI: 10.1016/j.crcon.2024.100274

Phon Thatiyamanee , Pattana Laopaiboon , Lakkana Laopaiboon

This study optimized ethanol production from sweet sorghum stem juice (SSJ) by Saccharomyces cerevisiae NP01 under very high gravity (VHG) fermentation in 500-mL air–locked flasks at 30 °C. Response surface methodology based on a Box-Behnken design was employed to optimize initial sugar (267 g/L), urea (3.24 g/L), and cell concentration (1.32 × 10⁸ cells/mL) for maximization of ethanol concentration (P_E), productivity (Q_P), and sugar consumption (%SC). The experimental values (P_E, 119.29 g/L; Q_P, 2.49 g/L.h and %SC, 91.83 %) under optimal conditions were close to the predicted values, verifying the optimization process. Aeration (2.5 vvm for 4 h) increased viable cell counts and decreased glycerol production (a by-product), but not fermentation efficiency. An osmoprotectant (40 mM potassium chloride combined with 10 mM potassium hydroxide, KCl/KOH) at 30 °C had no positive effect on ethanol fermentation efficiency. However, at 25 °C, the osmoprotectant increased P_E from 106 to 116 g/L and ethanol yield from 0.46 to 0.49 g/g. At 35–37 °C, it prolonged cell viability, increasing P_E by 5–12 g/L and %SC by 3–8 % without affecting ethanol yield. However, at 39 °C, no positive impact occurred on ethanol fermentation efficiency. The findings from this study, particularly the optimized fermentation conditions and stress tolerance strategies, could guide the scale-up to an industrial level of bioethanol production from sweet sorghum stem juice or other feedstocks using VHG fermentation, contributing to the development of more efficient and sustainable biofuel production processes.

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引用次数: 0

Use of spent yeasts from bioethanol production plant as low-cost nitrogen sources for ethanol fermentation from sweet sorghum stem juice in low-cost bioreactors

IF 6.4 3区环境科学与生态学 Q2 ENERGY & FUELS

Carbon Resources Conversion

Pub Date : 2024-08-04 DOI: 10.1016/j.crcon.2024.100269

Thanawat Thanapornsin , Rattanaporn Phongsri , Lakkana Laopaiboon , Pattana Laopaiboon

Two spent yeasts from an ethanol production plant, spent yeast after distillation (SY-AD) and spent yeast after fermentation (SY-AF), were used as low-cost nitrogen sources for ethanol fermentation from sweet sorghum stem juice (SSJ) by a commercial dry yeast (Saccharomyces cerevisiae) in air-locked flasks. SY-AF was the more effective nitrogen source for ethanol fermentation, giving ethanol concentration (P_E) and ethanol productivity (Q_E) values of 95.22 g/L and 1.98 g/L·h, respectively. When SY-AF was disrupted by autolysis, and the spent yeast hydrolysate (SYH) obtained was used as a nitrogen supplement. It was found that ethanol production in terms of P_E and Q_E values increased to 102.20 g/L and 2.83 g/L·h, respectively. When three bioreactors, a stirred-tank bioreactor (STR, a typical bioreactor), a column bioreactor with stirrer (CS-R, a tower bioreactor) and an external loop bioreactor (ELR, a low-cost bioreactor with no agitation), were used for ethanol production from the SSJ supplemented with SYH, the fermentation efficiencies of all bioreactors were not different. Appropriate aeration during fermentation (0.31 vvm for 12 h) in the three bioreactors could enhance the Q_E value, reaching 3.36 g/L·h. Both the CR-S and ELR could be successfully used for ethanol production from SSJ supplemented with SYH.

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引用次数: 0

Developments and challenges on enhancement of photocatalytic CO2 reduction through photocatalysis 通过光催化增强光催化二氧化碳还原的发展与挑战

IF 6 3区环境科学与生态学 Q2 ENERGY & FUELS

Carbon Resources Conversion

Pub Date : 2024-06-04 DOI: 10.1016/j.crcon.2024.100263

Haiquan Wang , Qingjie Guo , Hongyan Zhang , Cheng Zuo

The conversion of CO₂ into high-value fuels and chemicals has garnered research interest worldwide. The conversion and utilization of CO₂ has become one of the most urgent tasks for society. In this context, using solar energy to convert CO₂ into high-value fuels such as CH₄ and CH₃OH has extremely high potential application value. Herein, the research progress and results of applying various photocatalysts in photocatalytic CO₂ reduction with various novel catalysts were reviewed. Furthermore, strategies for improving photocatalytic performance were reviewed. Finally, improving the catalytic mechanism of catalysts and designing novel high-activity, high-stability catalysts through comprehensive exploration of the reaction mechanism were suggested to meet the future requirements of industrial production.

将二氧化碳转化为高价值的燃料和化学品已引起全世界的研究兴趣。二氧化碳的转化和利用已成为社会最紧迫的任务之一。在此背景下，利用太阳能将 CO2 转化为 CH4 和 CH3OH 等高价值燃料具有极高的潜在应用价值。本文综述了利用各种新型催化剂光催化还原二氧化碳的研究进展和成果。此外，还综述了提高光催化性能的策略。最后，通过对反应机理的全面探索，提出了改进催化剂催化机理和设计新型高活性、高稳定性催化剂的建议，以满足未来工业生产的要求。

引用次数: 0

Outside Back Cover 封底外侧

IF 6 3区环境科学与生态学 Q2 ENERGY & FUELS

Carbon Resources Conversion

Pub Date : 2024-05-20 DOI: 10.1016/S2588-9133(24)00049-8

引用次数: 0

Hydrocarbon-conversion reaction and new paraffin-kinetic model during straight-run gas oil (SRGO) hydrotreating 直馏瓦斯油（SRGO）加氢处理过程中的碳氢化合物转化反应和新的石蜡动力学模型

IF 6.4 3区环境科学与生态学 Q2 ENERGY & FUELS

Carbon Resources Conversion

Pub Date : 2024-04-15 DOI: 10.1016/j.crcon.2024.100246

A series of related experiments were carried out based on prepared hydrocracking catalyst, Catalyst-HC. Ni & W and USY molecular sieve were selected as the hydrogenation active component and the cracking component of Catalyst-HC, respectively. Meanwhile, a kinetic model for paraffin conversion was constructed based on paraffin conversion law. Results obtained through this work indicate that the impact of H₂-pressure is relatively complex. As the H₂-pressure changes, the degree of hydrocracking reaction may be influenced by both hydrogen supply capacity and hydrogen proton concentration. Obtained conversion priority for three types of hydrocarbons on USY molecular sieve is as follows, aromatic ≫ cycloalkane > paraffin. Aromatic content in SRGO can affect its paraffin-retention in Hydro-D. Compared with the hydrotreating of SRGO with low aromatic content, when SRGO with relatively higher aromatic content is hydrotreated, its paraffin-retention is higher and its paraffin loss is also relatively smaller. Base on constructed model, the calculated values of SRGO-BJ conversion rate and paraffin-retention in Hydro-D are within ±10 % and ±5 % error lines, respectively. Thus, model schematic diagram is reasonable and can provide modeling reference for relevant model research.

以制备的加氢裂化催化剂 Catalyst-HC 为基础，进行了一系列相关实验。选择 Ni & W 和 USY 分子筛分别作为催化剂-HC 的加氢活性组分和裂解组分。同时，根据石蜡转化规律构建了石蜡转化动力学模型。研究结果表明，H2 压力的影响相对复杂。随着氢气压力的变化，加氢裂化反应的程度可能同时受到氢气供应能力和氢质子浓度的影响。三种烃类在 USY 分子筛上的转化优先级如下：芳烃 ≫ 环烷 > 石蜡。SRGO 中的芳烃含量会影响其在 Hydro-D 中的石蜡保留率。与芳烃含量低的 SRGO 加氢处理相比，芳烃含量相对较高的 SRGO 加氢处理后，其石蜡保留率较高，石蜡损失也相对较少。根据构建的模型，SRGO-BJ 在加氢-D 中的转化率和石蜡保留率的计算值分别在 ±10 % 和 ±5 % 的误差范围内。因此，模型原理图是合理的，可为相关模型研究提供建模参考。

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引用次数: 0

The role of graphene Oxide’s aromatic rings in activated carbon made from banana leaves (ACBL) and Fe3O4 in hydrogen production 氧化石墨烯的芳香环在香蕉叶活性炭（ACBL）和 Fe3O4 制氢中的作用

IF 6.4 3区环境科学与生态学 Q2 ENERGY & FUELS

Carbon Resources Conversion

Pub Date : 2024-04-14 DOI: 10.1016/j.crcon.2024.100239

Dewi Sartika , Denny Widhiyanuriyawan , Agung Sugeng Widodo , Purnami , I.N.G Wardana

Fe₃O₄ is an internal magnet that can work as a medium for the electrolyte solution in electrochemical hydrogen production to facilitate electron movement. When Fe₃O₄ is combined with activated carbon made from banana leaves (ACBL), electron transfer occurs between the ACBL aromatic ring and Fe³⁺ ions from solved Fe₃O₄, which increases the solution’s conductivity and finally produces more hydrogen. ACBL is a biomass catalyst used as a free parameter to increase the Fe₃O₄ magnetic field in the solution. The Fe₃O₄ was synthesized using the coprecipitation method, while ACBL was obtained through an activation process to produce graphene oxide. Graphene oxide in ACBL was characterized using Scanning Electron Microscopy (SEM) EDX, Fourier Transform Infra-Red (FTIR), Brunauer, Emmett, and Teller (BET), and TEM (Transmission Electron Microscopy). BET was used to determine the surface area of ACBL. Hydrogen was produced using the electrolysis method. The SEM results showed that the elemental content of graphene oxide in ACBL was 72.47 %. The graphene oxide in ACBL had a positive charge represented by a bright color on the sample surface. The positive charge was due to the FTIR O-H and C-O groups working with Fe₃O₄. BET analysis showed that the average pore diameter of ACBL was 1.68 nm. The largest hydrogen production results were obtained at ACBL 200 mesh, which was 15.5 ml. ACBL from abundant biomass has magnetic and electrical potential within its aromatic ring. As the aromatic ring interacts with the magnetic field of Fe₃O₄, the electromagnetic field of the solution is strengthened. As a result, hydrogen production increases.

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引用次数: 0

A non-aseptic bioprocess for production and recovery of 2,3-butanediol via conversion of crude glycerol and corn steep liquor at pilot-scale 通过中试规模的粗甘油和玉米浸出液转化生产和回收 2,3-丁二醇的非无菌生物工艺

IF 6.4 3区环境科学与生态学 Q2 ENERGY & FUELS

Carbon Resources Conversion

Pub Date : 2024-04-13 DOI: 10.1016/j.crcon.2024.100242

Dimitris Karayannis , Nikos Angelou , Gabriel Vasilakis , Ioannis Charisteidis , Alexandros Litinas , Seraphim Papanikolaou

The production and recovery of 2,3-butanediol (BDO) through biodiesel derived glycerol valorization by Klebsiella oxytoca ACA-DC 1581 was holistically optimized with regard to the efficiency and cost of the bioprocess. The absence of thermal treatment of the substrate had no negative effect upon the growth of microorganism and the bioconversion of crude glycerol into BDO, enabling the development of a non-aseptic and lower-cost bioprocess. Both digestate and corn steep liquor (CSL), the main by-products of the biogas and corn industries respectively, successfully served as the sole source of nitrogen, contributing to the complete replacement of more expensive sources (e.g., yeast extract). The biochemical pathway of glycerol catabolism was examined under varying concentrations of dissolved oxygen and BDO production was optimized in a fully aerobic environment (volumetric mass transfer coefficient; k_La = 70.5 1/h.) The glycerol consumption rate was 2.80 g/L/h, the BDO productivity reached 1.12 g/L/h and the yield of BDO produced per unit of glycerol consumed was 0.46 g/g, with these values being among the highest ones reported in the literature for wild-type strains cultivated on crude glycerol. In all fed-batch fermentations, final BDO and acetoin concentration reached ∼80 g/L, while a plateau was observed at ∼68 g/L of BDO. Finally, the culture was carried out efficiently in the pilot-scale reactor (250 L). The salting-out extraction (SOE), consisting of ethanol (24 %) and K₂HPO₄ (25 %), recovered 91.7 % of BDO from the fermentation medium and was studied for the first time in a glycerol-based medium. The study suggests the potential industrialization of the bioprocess through sustainable, pilot-scale and low-cost bioconversion of biodiesel-derived crude glycerol and CSL or digestate into BDO.

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引用次数: 0

CO2 methanation over low-loaded Ni-M, Ru-M (M = Co, Mn) catalysts supported on CeO2 and SiC 以 CeO2 和 SiC 为载体的 Ni-M、Ru-M（M = Co、Mn）催化剂的 CO2 甲烷化作用

IF 6.4 3区环境科学与生态学 Q2 ENERGY & FUELS

Carbon Resources Conversion

Pub Date : 2024-04-10 DOI: 10.1016/j.crcon.2024.100241

Chopendra G. Wasnik, Maki Nakamura, Taiki Shimada, Hiroshi Machida, Koyo Norinaga

The concentration of the major greenhouse gas CO₂ is rapidly increasing in the atmosphere, leading to global warming and a range of environmental issues. An efficient circulation and utilization of CO₂ is critical in the current environmental context. Methanation, an exothermic process, emerges as a critical strategy for effective CO₂ utilization. On this front, there is a significant demand for rational design of catalysts that maintain high activity and methane selectivity over a wide temperature range (250–550 °C). The catalyst that can promise a consistent reaction even at 500 °C under an atmospheric pressure is thus obliged. The present study investigated bimetallic catalysts with SiC, which is known for its exceptional thermal conductivity, and CeO₂, which is characterized by its CO₂ affinity, as base materials. We incorporated Ni-M and Ru-M (M = Co and Mn) as the active metals, each loaded at 2 %. Impressively, with merely 20 mg, the Ni-Co/SiC catalyst achieved a CO₂ conversion rate of 77 % and CH₄ selectivity of 88 % at 500 °C, in a fixed-bed tubular reactor system with conditions of H₂/CO₂ = 4, a total flow rate of 70 ml min⁻¹, and a steady GHSV of 12,000 h⁻¹. Moreover, 2Ni-2Co/CeO₂ catalyst demonstrated exceptional performance with a 76 % conversion of CO₂ and a 83 % selectivity for CH₄, all under identical conditions. The catalyst's durability was confirmed by a subsequent 40-hour stability test, which showed only a 3–5 % degradation. The developed catalysts were comprehensively characterized by BET/BJH, CO pulse chemisorption, H₂-TPR, HAADF-STEM-EDS, SEM-EDS and XRD etc. to unveil their physicochemical and surface traits. It was found that Co and Mn, when integrated, effectively restrained the agglomeration of Ni and Ru particles, ensuring optimal metal dispersion on the support. In conclusion, our synthesized bimetallic catalysts shown a sustained catalytic capability, even in the high-temperature environment.

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引用次数: 0

Hydrophobicity and performance analysis of beverage and agricultural waste torrefaction for high-grade bio-circular solid fuel 将饮料和农业废弃物热解为高级生物循环固体燃料的疏水性和性能分析

IF 6.4 3区环境科学与生态学 Q2 ENERGY & FUELS

Carbon Resources Conversion

Pub Date : 2024-04-05 DOI: 10.1016/j.crcon.2024.100243

Napat Kaewtrakulchai , Sutthipoj Wongrerkdee , Benjapon Chalermsinsuwan , Namfon Samsalee , Chao-Wei Huang , Kanit Manatura

Torrefaction is recognized as a high-performance technology for converting raw biomass into high-grade solid biofuel. In this study, hydrophobic and ANOVA analyses were employed to investigate torrefied brewery waste, palm kernel shell, and water hyacinth residue. Herein, the torrefaction experiments were conducted at four temperatures (180, 230, 280, and 330 °C) for a residence time of 30 min. The biomass type and temperature were crucial in determining the optimum conditions for three response parameters: energy yield (EY), specific energy consumption (SEC), and hygroscopic reduction equilibrium (HRE). Hydrophobicity was assessed by measuring the contact angle (CA), and equilibrium moisture content (EMC) to represent hygroscopic behavior. The ANOVA results indicated that temperature had the most significant impact on the response parameters. Optimal torrefaction of brewery waste at 180 °C yielded an EY of 82.05 %, SEC of 81.88 kWh/kg, and HRE of 23.2 %. These findings highlight the advantages of biomass-derived torrefaction products in waste utilization, transport, and storage of biomass-derived torrefaction products. Furthermore, this study demonstrates an efficient method for enhancing the fuel quality of biomass, contributing significantly to the bio-circular green economy concept.

{"title":"Hydrophobicity and performance analysis of beverage and agricultural waste torrefaction for high-grade bio-circular solid fuel","authors":"Napat Kaewtrakulchai , Sutthipoj Wongrerkdee , Benjapon Chalermsinsuwan , Namfon Samsalee , Chao-Wei Huang , Kanit Manatura","doi":"10.1016/j.crcon.2024.100243","DOIUrl":"10.1016/j.crcon.2024.100243","url":null,"abstract":"<div><div>Torrefaction is recognized as a high-performance technology for converting raw biomass into high-grade solid biofuel. In this study, hydrophobic and ANOVA analyses were employed to investigate torrefied brewery waste, palm kernel shell, and water hyacinth residue. Herein, the torrefaction experiments were conducted at four temperatures (180, 230, 280, and 330 °C) for a residence time of 30 min. The biomass type and temperature were crucial in determining the optimum conditions for three response parameters: energy yield (EY), specific energy consumption (SEC), and hygroscopic reduction equilibrium (HRE). Hydrophobicity was assessed by measuring the contact angle (CA), and equilibrium moisture content (EMC) to represent hygroscopic behavior. The ANOVA results indicated that temperature had the most significant impact on the response parameters. Optimal torrefaction of brewery waste at 180 °C yielded an EY of 82.05 %, SEC of 81.88 kWh/kg, and HRE of 23.2 %. These findings highlight the advantages of biomass-derived torrefaction products in waste utilization, transport, and storage of biomass-derived torrefaction products. Furthermore, this study demonstrates an efficient method for enhancing the fuel quality of biomass, contributing significantly to the bio-circular green economy concept.</div></div>","PeriodicalId":52958,"journal":{"name":"Carbon Resources Conversion","volume":"8 1","pages":"Article 100243"},"PeriodicalIF":6.4,"publicationDate":"2024-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140790403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Gamma-irradiation assisted green synthesis of water hyacinth-derived carbon dots for enhanced photoselective film applications

IF 6.4 3区环境科学与生态学 Q2 ENERGY & FUELS

Carbon Resources Conversion

Pub Date : 2024-04-03 DOI: 10.1016/j.crcon.2024.100240

Kanokorn Wechakorn , Threeraphat Chutimasakul , Thipthanya Duangmanee , Bordin Weerasuk , Sakchai Laksee , Piriya Kaeopookum , Chuleekron Seesuea , Tanagorn Sangtawesin

High quantum yield carbon dot (CD) was synthesized from water hyacinth leaves (WH) through ionizing gamma radiation, eliminating the need for heat or chemical treatments. The study investigated the effects of different gamma doses (50, 100, 150 kGy) on the resulting CD's optical properties, particle sizes, and surface chemistry. The 50 kGy dose produced CD (CD50) with a remarkable quantum yield of 48.3 %. Polyvinyl alcohol (PVA)-CD50 composite films demonstrated enhanced root growth in Chinese convolvulus by 19 % and were non-toxic to human cells. These composites also proved effective for food packaging applications, as evidenced by the reduced color changes in strawberries under UV light exposure. This study introduces a green synthesis approach for transforming invasive water hyacinth into a high-value CD, with promising applications in electronics, catalysis, and sensing.

引用次数: 0

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