Sustainable Energy Technologies and Assessments
·
2026
·
IF 7.4
Hui Li,Yixuan Zhang,Phumlani Fortune Msomi,Yunpu Wang,Xiaoling Ma
CaO-CNT absorbs 92% broad-spectrum light and rapidly produces localized heat. • Photothermal transesterification delivers efficient energy supply to active sites. • Under optimal conditions, 99.22% biodiesel conversion is achieved at 50 °C. • LCA demonstrates low carbon profile with GWP 2.07 kg CO 2 eq·kg −1 and DFF 28.24 MJ·kg −1 . Transesterification for biodiesel production demands external heat supplied through temperature gradient-driven heating, which limits energy efficiency. Photothermal catalysis offers an alternative route, but reported photothermal catalysts for biodiesel transesterification often suffer from narrow-spectrum light harvesting, strict requirements for monochromatic high-power light sources, and inefficient heat delivery to active sites, which severely restrict their practical application. In this study, a CaO-CNT photothermal catalyst was fabricated via wet impregnation coupled with high-temperature calcination to enable in-situ solar-to-heat conversion and boost catalytic activity. Multiple characterization techniques, including TG/DTG, XRD, XPS, SEM, Raman spectroscopy, N 2 adsorption and desorption, UV-Vis-NIR spectroscopy and infrared thermal imager were carried out, and simulated sunlight from a xenon lamp was used for palm oil photothermal transesterification. The CaO-CNT catalyst exhibited 92% light absorption over 300-2500 nm and rapidly increased its surface temperature from ambient temperature to 70.7 °C within 300 s under an irradiation power density of 14.5 W/g. Compared with conventional water-bath heating, photothermal heating catalyzed by CaO-CNT resulted in higher biodiesel conversions, with improvements of 7.71%, 12.48%, and 9.71% at 46 °C, 50 °C, and 54 °C, respectively. The maximum biodiesel conversion of 99.22% was achieved by photothermal-driven heating with a catalyst loading of 6 wt%, a methanol/oil molar ratio of 10, and an irradiation power density of 15.2 W/g for 2.5 h. Findings from life cycle assessment (LCA) established that the global warming potential (GWP) of this process reached 2.07 kg CO 2 eq·kg −1 , with the depletion of fossil fuel (DFF) amounting to 28.24 MJ·kg −1 . Download: Download high-res image (194KB) Download: Download full-size image
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高影响因子
AICHE JOURNAL
·
2026
·
IF 4.4
Xuexue Dong,Benhuan Xu,Jian Tian,Bo Jiang,Yu Deng,Bin Chen,Yixin Li,Gen Li,Guowu Zhan
Selective deoxygenation of fatty acids to diesel-range alkanes without carbon-chain shortening is essential for sustainable biomass upgrading, but high selectivity remains challenging by competing decarbonylation/decarboxylation pathways. Here, a Re/In 2 O 3 featuring Re single atoms and ReO 3 clusters was synthesized for the hydrodeoxygenation of stearic acid. In contrast to In 2 O 3 , which primarily yields 1-octadecanol (93.1% selectivity) with minimal n-octadecane (1.2% selectivity), the optimized Re/In 2 O 3 catalyst achieves 100% selectivity diesel-range alkanes (>85% n-octadecane). Isotopic labeling, in situ spectroscopy, and kinetic analyses reveal Re-induced synergy: ReO 3 enhance H 2 dissociation, while Re single atoms promote bidentate adsorption of fatty acids, and oxygen vacancies in In 2 O 3 facilitate selective C–O bond cleavage. This multifunctional synergy suppresses C–C bond scission and significantly lowers the apparent activation energy for hydrodeoxygenation by 36.5 kJ·mol −1 . The catalyst exhibits broad applicability across diverse carboxylic acids, including unsaturated and aromatic substrates, underscoring its potential for efficient biomass utilization.
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CONSTRUCTION AND BUILDING MATERIALS
·
2025
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IF 8
Xiaohua Li,Xiujian Xia,Susu Xing,Yongxu Xie,Rongyao Chen,Miaomiao Hu,Jintang Guo
Excessive heat release during cement hydration in deepwater cementing operations can readily cause thermal decomposition of natural gas hydrates, leading to gas blowout incidents that compromise cementing quality. Incorporating phase change materials (PCMs) into deepwater cementing slurry systems effectively addresses this issue by regulating hydration temperatures. However, traditional PCMs suffer from insufficient mechanical strength and poor interfacial compatibility, leading to severe deterioration of cement mechanical properties. This study prepared nanoscale hybrid shell phase change microcapsules (MS@EPNS) with high-strength three-dimensional network structures. Silica nanoparticles were innovatively generated in-situ on the epoxy shell surface through a molecular bridging strategy to form crosslinks. Compared with epoxy shell microcapsules, MS@EPNS showed significantly enhanced mechanical strength (Young's modulus 4.13 GPa), thermal storage performance (186.6 J/g), and thermal stability. Results demonstrate that MS@EPNS exhibits excellent thermal regulation capability. The addition of 7 % MS@EPNS reduced hydration induction time by 6 %, while decreasing hydration temperature by 9.2°C. Qualitative and quantitative analyses revealed that MS@EPNS could induce preferential growth of calcium silicate hydrate on its surface, achieving secondary encapsulation of the microcapsules and significantly enhancing interfacial bonding strength, ultimately forming composite cement materials with low porosity and high strength. The cement stone containing 5 % MS@EPNS exhibited compressive strength increases of 27 % and 26.8 % after 3 days of curing at 20°C and 10°C, respectively. The prepared microcapsules successfully achieved synergistic optimization of mechanical properties and thermal regulation functions in cement composites, providing new insights for the development of high-performance deepwater cementing slurry systems.
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INDUSTRIAL CROPS AND PRODUCTS
·
2026
·
IF 6.4
Siwei Liu,Mengting Wang,Shuyang Jiang,Taohong Li,Hongrui Zeng,Weishuai Dai,Shouqing Liu,Xuemei Li
The heterogeneous solid base catalyst integrates catalytic activity with emulsifying capacity. • 94.51% conversion was achieved for WFO to biodiesel in 36 min at 20℃. • The catalyst exhibits excellent water and free fatty acid tolerance. • The catalyst has excellent reusability and regenerability. Due to heterogeneous nature, the biodiesel synthesis via transesterification typically requires high temperatures or long reaction times even under catalytic conditions. To address this challenge, we designed a bifunctional composite solid base catalyst by loading K₂CO₃ onto activated carbon (K 2 CO₃/AC), which synergistically integrates catalytic activity and emulsifying capacity. With the formation of Pickering emulsions in the alcohol-oil system, transesterification reaction is remarkably accelerated via enhanced interfacial contact. Specifically, for waste frying oil methanolysis, a conversion of 94.51% was achieved within 36 min at 20℃. Mechanism investigations indicate that a high K 2 CO 3 loading combined with an appropriate particle size of the catalyst is crucial for achieving efficient emulsification and catalysis. The catalyst demonstrated exceptional impurity tolerance, maintaining > 90% biodiesel conversion even with 1.5 wt% free fatty acids (FFAs) and 2.4 wt% water, which demonstrates significant improvements in FFA and water tolerance over homogeneous base catalysts. Moreover, the as-synthesized biodiesel satisfied the specifications of the international standards ASTMD 6751 and EN −14214 in terms of key physicochemical properties. In addition, it exhibited superior reusability (>90% conversion after three cycles) and easy regenerability via simple K 2 CO 3 re-impregnation. Featuring facile preparation, excellent catalytic performance at room temperature, and high stability, this amphiphilic catalyst presents an industrially feasible and impurity-tolerant solution for biodiesel synthesis.
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DIAMOND AND RELATED MATERIALS
·
2023
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IF 4.1
Yuan Xue,JinXia Wang,Hong Yuan,Hui Li
With the aim of preparing a sulfonic acid-type solid acid catalyst having a high density of acid sites and excellent stability, this work synthesized sulfonic acid bowl-shaped hydrothermal carbon microspheres (SA-OBHCs), using amine groups as the primary sulfonic acid bonding sites. This material was synthesized via a three-step functionalization process comprising the oxidation , amidation and sulfonation of BHCs. The extent to which chlorosulfonic acid reacted with amine groups in diethylenetriamine molecules on microsphere surfaces was also investigated using density functional theory calculations. These calculations showed that the substitution reaction of primary amines proceeded less readily than that of secondary amines but provided a more stable product. The surface acid d ensity of the SA-OBHCs was as high as 11.2 mmol·g −1 and the –SO 3 H groups on the SA-OBHCs were found to be thermally stable up to 200 °C. These SA-OBHCs were subsequently used to catalyze the synthesis of fatty acid methyl esters (FAMEs) from a waste frying oil model compound and methanol. Reactions performed using a methanol/oil molar ratio of 20:1 at 140 °C for 3 h gave a FAMEs yield of 93.4 %. After four reuses, an SA-OBHCs specimen provided a FAMEs yield of 77.5 %, demonstrating the significant stability of this material.
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高影响因子
WASTE MANAGEMENT
·
2023
·
IF 8.1
Hongxu Lu,Yanxia Liu,Wenyue Shen,Yang Zhou,Xiangwei Ma,Shibo Sun,Xiaoying Dong,Fengyun Ji,Huiyan Tong,Jianqiang Xu,Gaohong He,Weiping Xu
Food waste can be converted into insectile fatty acids (FAs) by the larvae of black soldier fly (BSFL), Hermetia illucens , for use in the feed sector or as a source of biodiesel. However, waste oil was less decomposed than carbohydrate or protein in frass due to the limitation of larval lipid metabolism. In this study, 10 yeast strains were screened, corresponding to six species, to examine their capacity of improving lipid transformation performance by BSFL. The species of Candida lipolytica was superior to the other five species, which exhibited significantly higher lipid reduction rate (95.0–97.1 %) than the control (88.7 %), and the larval FA yields achieved 82.3–115.5 % of the food waste FA matters, suggesting that BSFL not only transformed waste oil but also biosynthesized FAs from waste carbohydrate and other substances. Further, the CL2 strain of Candida lipolytica was examined for treating food waste containing high lipid content (16–32 %). The lipid removal rate was found improved from 21.4 to 42.3 % (control) to 80.5–93.3% in the waste containing 20–32 % lipid. The upper limit of lipid content that could be endured by BSFL was ≈16 %, and the CL2-enrichment elevated the upper limit to ≈24 %. Fungal community analysis indicated that Candida spp. accounted for the lipid removal improvement. The Candida spp. CL2 strain may facilitate the lipid reduction and transformation by BSFL through microbial catabolizing and assimilation of waste FAs. Altogether, this study suggests that yeast enrichment is feasible in improving lipid transformation by BSFL especially for food waste exhibiting high lipid content.
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PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Siyu Pan,Jun Yan,Xu Peng,Zhou Xu,Qi Zeng,Zhonghui Wang,Minzhong Zhao,Yi Chen
In the poly(vinyl chloride) (PVC) industry, waste cooking oil (WCO)-derived epoxidized fatty acid methyl esters (EFAMEs) represent a promising bio-alternative to conventional ortho-phthalate plasticizers that are being phased out due to their toxicity and nonrenewable nature. However, to improve the leaching resistance of EFAMEs, the WCO feedstock has to go through multistage distillation at particularly high temperatures under vacuum conditions for saturated component removal, resulting in intensive energy consumption, a significant waste of the feedstock, and a final bioplasticizer with a still faster leaching rate than those of ortho-phthalates. Here, we report a strategy that can Y-shape all components in WCO-derived EFAMEs with another short, polar ester chain via a nucleophilic substitution reaction of the feedstock mixture with dimethyl carbonate. This strategy entails no utilization of an energy-intensive procedure and, importantly, converts all components in the WCO feedstock into the final bioplasticizer. Relative to ordinary EFAMEs, the Y-shaped epoxidized fatty acid methyl diester exhibits a significantly suppressed leaching rate. Under certain scenarios, it even leaches at a rate equivalent to or slower than that of di-(2-ethylhexyl) phthalate (DEHP), the most ubiquitously applied member of the ortho-phthalate family. With this strategy in hand, the renewable WCO may be converted into a high-performance bioplasticizer in an energy-efficient and atom-economic manner to support the phase-out of ortho-phthalates in the PVC industry.
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2022
·Vol. 98
·期 1
·66-76
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IF 3.709
Yuan Xue,Xueling Zhao,Hong Yuan,Hui Li
Background An efficient sulfonic acid-type acid catalyst with high acid site density based on hydrothermal carbon microspheres (HCMs) has been developed. The reaction by which double bonds in the HCMs were oxidized to generate carboxyl groups was evaluated based on density functional theory calculations. Results Sulfonic acid-type HCMs (SHCMs) were prepared from HCMs through a three-step process comprising oxidation, amidation and sulfonation. An analysis of the oxidation process indicated that the formation of carboxyl groups involved the activation of O 2 molecules and C H bonds, the cleavage of CC bonds, the homolytic fission of peroxy acids and the coupling reactions of H • radicals. The formation of numerous carboxyl groups on the HCM surfaces was the key to obtaining SHCMs with a high acid density of 14.5 mmol g −1 . Conclusions The SHCMs obtained exhibited good catalytic performance during the transesterification of waste frying oil with methanol. Reactions performed using a methanol/oil molar ratio of 9:1 at 90 °C for 5 h gave a fatty acid methyl ester yield of 85.56%. © 2022 Society of Chemical Industry (SCI).
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EUROPEAN JOURNAL OF LIPID SCIENCE AND TECHNOLOGY
·
2022
·Vol. 124
·期 9
·2100254
·
IF 3.196
Kainan Xing,Minghe Cao,Qinkai Zhu,Haojie Yin,Meizhen Lu,Jianbing Ji
Vegetable oils and their derivatives are of great interest because of their abundance and renewability. This paper prepares nonanal (N) and methyl 9-oxonanoate (M) from methyl epoxystearate (ME) with WO 3 ∙0.33H 2 O, WO 3 ∙H 2 O, and WO 3 ∙2H 2 O as catalysts and H 2 O 2 as the oxidant without the use of organic solvent. The reaction temperature, catalyst amount, H 2 O 2 amount, and reaction time effects on ME conversion and N/M yield are investigated. The results show that WO 3 ∙H 2 O has the best catalytic performance. The optimal reaction conditions are: reaction temperature 60 °C, reaction time 40 min, ME/H 2 O 2 /WO 3 ∙H 2 O molar ratio 1/1.2/0.4, under which the ME conversion and N/M yield reach 95% and 70%, respectively. WO 3 ∙ n H 2 O reacts with H 2 O 2 to form soluble tungsten anions, resulting in severe tungsten loss. Al-MCM-41 materials with different silicon to aluminum molar ratios are added to the reaction system as adsorbents to recover the catalyst by effective adsorption of tungsten anions. The adsorption performance improves as the Si/Al ratio decreases, however, the ME conversion and N/M yield decrease. Thus, 50 is the most suitable Si/Al ratio. The ME conversion and N/M yield can still reach 90% and 60% after four times of use. Practical applications : The nonanal has a natural fragrance and can be used in the cosmetic industry as well as in the preparation of bio-based surfactants. The methyl 9-oxonanoate can be converted into polymer monomers by hydrogenation or amination. The results show that WO 3 ∙ n H 2 O has good catalytic activity, and a satisfying yield of aldehyde products is obtained under mild reaction conditions.
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FUEL
·
2022
·
IF 8.035
Yi-Tong Wang,Xiao-Man Wang,Di Gao,Fu-Ping Wang,Ya-Nan Zeng,Jun-Guo Li,Li-Qun Jiang,Qing Yu,Rui Ji,Le-Le Kang,Ya-Jun Wang,Zhen Fang
In this study, nanocatalysts for biodiesel production were prepared via wet impregnation of blast furnace dust (BFD) in Na 2 CO 3 (Na-BFD) and CaCO 3 (Ca-BFD) suspension solutions and calcination at 500 and 600 °C, respectively. Biodiesel yields of 100.0 wt% (Na-BFD 500 ) and 98.3 wt% (Ca-BFD 600 ) were achieved at 65 °C. Synthesized catalysts showed outstanding activity and recyclability, due to the transition of CaCO 3 , Na 2 CO 3 and Fe 2 O 3 to nanocrystals of NaFeO 2 (29.9 nm), Ca 2 Fe 2 O 5 (10.5 nm), CaO (100.1 nm) and Ca 2 Fe 2 O 5 (50.0 nm). Na-BFD 500 achieved 95.8 wt% biodiesel yield with 16 cycles, whereas Ca-BFD 600 reached 94.1 wt% biodiesel yield with 7 cycles via magnetic separation. BFD containing convertible magnetic and active components (Fe 2 O 3 and CaCO 3 ) was an ideal raw material to synthesize catalyst for biodiesel production with high catalytic efficiency and easy separation. The study provided a practical utilization of industrial solid waste for biodiesel production.
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高影响因子
FUEL
·
2022
·
IF 8.035
Lin Fu,Zhaoxin Liu,Xin Li,Yongfei Li,Houyi Yang,Yuejin Liu
Ni-catalysts usually experienced quick deactivation during bio-lipids deoxygenation due to metal sintering and coke. Here we prepared a series of Ni/CeO 2 -Al 2 O 3 catalysts, denoted as NiCeAl-EISA, NiCeAl-WI and NiCeAl-CP, prepared by evaporation-induced self-assembly (EISA), wetness impregnation (WI), co-precipitation (CP) methods, respectively, aiming at tuning metal-support interaction (MSI) in Ni/CeO 2 -Al 2 O 3 catalysts for the deoxygenation of bio-lipids to hydrocarbons. The porosity and surface properties of the catalysts are systematically studied by BET, XRD, H 2 -TPR, HR-TEM, FT-IR, O 2 -TPD, NH 3 -TPD, RPR, Py-FTIR, XPS and in situ XPS. The NiCeAl-EISA catalyst afforded 92.2% n-C 11 yield at full methyl laurate conversion, and efficiently deoxygenated different FAMEs, yielding corresponding alkanes yields of 97.8% (n-C 9 ), 96.4% (n-C 13 ), 94.3% (n-C 15 ) and 92.9% (n-C 17 ). The TOFs were calculated as 426–719, 241–343 and 148–243 h −1 for NiCeAl-EISA, NiCeAl-WI and NiCeAl-CP catalysts, respectively. Jatropha oil and waste cooking oil were also converted into liquid alkanes (C 13-18 ) with a total yield of 95.4% and 93.7%, respectively. The NiCeAl-EISA catalyst exhibits superior catalytic activity and remained stable with 92.2% n-C 11 yield after 11 consecutive runs, as compared with NiCeAl-WI and NiCeAl-CP. This significant increase in catalyst activity and stability is closely correlated with the tunable SMSI of Ni/CeO 2 -Al 2 O 3 catalyst, which facilely forms abundant oxygen vacancies and interfacial sites (Ni δ+ -O V -CeO x ). This suppresses strong Ni-Al interaction, thus exposing more active and robust Ni sites to promote R-COOH → R-CHO reduction to produce more alkanes. The weakened Ni-Al interaction also reduces the strong acidity and consequently inhibits the coke formation and simultaneously restrains C–C bond cleavage of hydrocarbons.
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CONSTRUCTION AND BUILDING MATERIALS
·
2022
·
IF 7.693
Jikun Ma,Hui Liu,Dawei Sun,Jianfeng Wang,Suping Cui
In this study, novel microencapsulated phase change materials (PU-UF MPCMs) with methyl palmitate and methyl stearate as core and double-layered shell structure were designed for building energy conservations. Their composition, microstructure and thermal performances were determined by techniques including optical microscope (OM), scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). Effects of PU-UF MPCMs on the thermal performance of cementitious composites were also investigated. Results show that PU-UF MPCMs with spherical shape and double-layered shell structure were successfully prepared. DSC results show that the latent heat of PU-UF MPCMs is 137.6 J/g and the melt temperature of cores in PU-UF MPCMs is 24.2 °C. 5%-15% PU-UF MPCMs addition increases the thermal storage capacity of cement pastes through a phase transition process, among which 15% PU-UF MPCMs leads to the highest thermal storage capacity. Those results suggest that PU-UF MPCMs exhibit the potential for enhancing energy savings and thermal comfort of buildings.
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高影响因子
危险品化学品经营许可证（带存储）