BIOMASS & BIOENERGY
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2024
·
IF 5.8
Linghui Kong,Yunyu Guo,Baihong Li,Yuewen Shao,Chao Li,Lijun Zhang,Zhihui Pan,Yuxuan Liu,Shu Zhang,Qiaoling Li,Xun Hu
Cracking reactions play essential roles in pore development of activated carbon (AC) during activation of a biomass feedstock with K 2 C 2 O 4 . Strengthening activity of activating agents for cracking might increase capability for creating pores. This was verified herein by conducting activation of poplar wood and its derived biochar by K 2 C 2 O 4 with Ni presence for enhancing activity for cracking. The results indicated that nickel species promoted cracking, decreasing substantially yield of AC by 41.4 % and abundance of organics in resulting bio-oils. Nonetheless, nickel presence remarkably enlarged pore volume (1.0 versus 0.7 cm 3 /g in control experiment without Ni) and average pore diameter (1.7 versus 1.0 nm), creating more mesopores (84.7 % versus 96.8 %) and macropores. Activation of poplar-derived biochar enhanced specific surface area (1167.4 versus 1033.4 m 2 /g) and also formation of mesopores (81.0 % versus 98.1 %) with nickel presence. Additionally, nickel also promoted dehydrogenation and deoxygenation, rendering AC of higher aromatic degree. However, some nickel species inserting skeleton of AC were difficult to be removed via acid washing, which blocked some pores. Nickel presence also led to more fragmented structure of AC in either activation of PW or the biochar, generating more larger pores with minimized steric hindrance for adsorption of large molecules like tetracycline.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2016
·Vol. 41
·期 3
·1103-1109
·
IF 3.277
Hongmei Yang,Ge Gao,Yihan Wang,Jinrong Liu,Zongjun Li,Rui Su,Bing Wang,Wenhui Lian,Xinhua Guo,Shuying Liu
Glycosides, which are widely distributed in many plants, possess numerous biological activities. Direct analysis in real time (DART) allows the rapid analysis of samples or objects in their native state in the open environment. The ionization characteristics of glycosides by DART, however, have not yet been investigated in detail. DART quadrupole-time of flight mass spectrometry (DART-Q-TOF-MS) was developed to investigate the ionization characteristics of different kinds of glycosides in both positive and negative ion modes. All the glycosides were ionized via various different reactions including (de)protonation, molecular ion formation, ISD fragmentation, and the formation of adducts. In contrast, glycosidic cleavage ions and molecular ions (radical ions) were easily detected in negative DART mass spectra by the capture of an electron. The degree of glycosidic cleavage varied with the structural properties of individual glycosides, which were substantiated by theoretical calculations using the software package Gaussian 09. Temperature and types of DART gas played important roles in DART mass spectrometric analysis of glycosides.
研究领域:
分析化学
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植物化学
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
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2020
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IF 3.421
Riyi Lin,Kai Chen,Mingqiang Miao,Liqiang Zhang,Xinwei Wang,Ye Jiang,Jianliang Zhang,Yue Wang,Huida Pan
The generation of H2S causes many problems during steam injection thermal recovery. To make clear the formation rule of H2S under the condition of steam injection thermal recovery, tetrahydrothiophene was selected as a model compound, and then reaction mechanism and kinetics were explored based on indoor thermal simulation. The results showed that tetrahydrothiophene aquathermolysis reaction can generate a large amount of H2S. The C–S bond formed by heteroatom S broke at first and then opening-ring occurred, which produced small molecular alkanes or alkenes. The decarbonylation of aldehydes and other organic compounds resulted in the formation of CO, hydrocarbons, and other related compounds. High-temperature water played a key role in the process of tetrahydrothiophene aquathermolysis reaction and would directly participate in the elementary reactions such as hydrolysis and water–gas shift reaction (WGSR). These elementary reactions would finally lead to the migration of hydrogen from water to gas-phase or liquid-phase products. In addition, a kinetic model of H2S formation during tetrahydrothiophene aquathermolysis reaction was established through kinetic experiments, the activation energy is 54.55 kJ/mol, and the frequency factor is 166.47 day–1.
研究领域:
石油工程
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化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2015
·
IF 3.52
Gui-jin He,Guang-qian Li,Hao Ying,Yong-sheng Guo,Wen-jun Fang
One of hyperbranched polymers is developed as a novel nanoscale initiator to enhance the heat sink of endothermic hydrocarbon fuels to meet the great cooling requirement of hypersonic aircrafts. In this work, the hyperbranched polyglycerol (HPG) is treated with palmitoyl chloride to obtain a fuel-soluble product, palmitoyl-hyperbranched polyglycerol (PHPG). The thermogravimetric analyses show that the long-alkyl chains rupture first from the matrix at about 200 °C, and then the HPG core breaks around 400 °C during the cracking of PHPG, which indicates a high decomposition temperature for this “macroinitiator”. The cracking processes of n -tridecane with PHPG in different molecular weights and addition quantities are performed in an electrically heated tube reactor under supercritical conditions (3.5 MPa, and 600–720 °C). PHPG can promote the cracking of n -tridecane with significant improvements of the conversion and heat sink. The conversion of n -tridecane is improved as high as 17.6% at 690 °C, and the corresponding heat sink is improved from 3.0 MJ/kg to 3.5 MJ/kg. Furthermore, the optimum addition quantity and molecular weight range of PHPG are chosen for the practical application to an aviation kerosene under 600–700 °C, and the increases of heat sink in comparison with those from the thermal cracking confirm the potential application of PHPG to endothermic hydrocarbon fuels.
研究领域:
材料科学
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化学工程
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航空航天工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
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2024
·
IF 3.3
Wenxian Liu,Liting Xu,Haina Cheng,Zhu Chen,Hongbo Zhou,Yuguang Wang
BACKGROUND The potential for the efficient conversion of lignocellulosic biomass has been extensively explored to produce a wide range of bioproducts. Many approaches have been sought for the deep conversion of lignin to generate products that are toxin-free and beneficial for processing into high-value-added components. RESULTS This study reported a fungus isolated from the deep sea with strong synthesis of multiple lignocellulases, conversion of lignin and guaiacol (0.1%) by 71.6% and 86.1% within 9 days at 30 °C respectively, and outstanding environmental adaptability (20–50 °C and pH 3–8). Metabolic pathway profiling showed that this fungus utilized lignin to rapidly activate multiple ring-opening reactions including the 2,3- and 3,4-cleavage pathways, with the 2,3-cleavage pathway predominating after 5 days. Conversion of metabolic intermediates confirmed the superb potential of this strain for lignin treatment. Meanwhile, its shikimic acid pathway was metabolically active under lignin. CONCLUSION This further expands the potential to produce valuable bioproducts during lignin treatment, especially under ambient conditions, which can significantly enhance high-value precursor compound production. © 2024 Society of Chemical Industry.
研究领域:
生物技术
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环境科学
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微生物学
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生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2025
·
IF 5.3
Jianxin Zhang,Brandon Han Hoe Goh,Cheng Tung Chong,William Woei Fong Chong,Jo-Han Ng
Development of efficient catalysts is important to promote the deoxygenation of oils and fats for the production of biofuels. In this study, several bimetallic catalysts including Fe, Co, and Ni were impregnated onto TiO2 and evaluated for their efficacy in deoxygenating long-chain trimethylolpropane trioleate (TMPTO) under a N2 atmosphere. FeNi/TiO2 exhibited the highest selectivity of 65.7% for C8–C16 hydrocarbons with a relatively good 85.3% deoxygenation performance. The catalyst maintained a stable deoxygenation efficiency of around 70.6% and a selectivity of 46.7% after four runs. Impregnation of transition metals leads to a decrease in the specific surface area, while the additional active sites facilitate deoxygenation and cleavage reactions. The acidic sites provided by Fe and TiO2 supports and the electronic modulation of Ni enhance the ability of the catalyst to crack C–O bonds. The results demonstrate the potential of using transition metals under a N2 environment to convert super long-chain oxygenated fatty acids into jet-fuel-range hydrocarbons.
研究领域:
催化化学
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生物燃料生产
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化学反应工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2016
·Vol. 9
·期 4
·1599-1606
·
IF 7.76
Jian Zhang,Lifang He,Peirong Chen,Chao Tian,Jianping Wang,Bianhua Liu,Changlong Jiang,Zhongping Zhang
Chemical sensing for the convenient detection of trace aqueous fluoride ions (F−) has been widely explored with the use of various sensing materials and techniques. It still remains a challenge to achieve ultrasensitive but simple, rapid, and inexpensive detection of F− for environmental monitoring and protection. Here we reported a novel surface-enhanced Raman scattering (SERS) nanosensor, fluorescein phenylboronic acid covalently linked to 1,4-dimercapto-2,3-butanediol modified Au@Ag NPs by a cyclic boronate ester (Flu-PBA-Diol-Au@Ag NPs), for the rapid and ultrasensitive detection of F−. Once the Flu-PBA approached the surface of Au@Ag NPs, the Raman signals of Flu-PBA were remarkably enhanced due to the strong SERS effect. However, the presence of F− will induce the cleavage reaction of the cyclic boronate ester into the trifluoroborate anion (3F-Flu-PBA) and diol. The 3F-Flu-PBA molecules exfoliated from the surface of Au@Ag NPs, and the SERS signals of the nanosensor were quenched. Following the sensing mechanism, a silica-based SERS chip has been fabricated by the assembly of Flu-PBA-Diol-Au@Ag NPs on a piece of silicon wafer. The silica-based SERS chips showed high sensitivity for aqueous F−, and the limit of detection (LOD) could reach as low as 0.1 nM. Each test using the SERS chip only needs a droplet of 20 μL sample and is accomplished within ∼10 min. The silica-based SERS chip has also been applied to the quantification of F− in tap water and lake water.
研究领域:
分析化学
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环境科学
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2019
·
IF 4.507
Junmei Liang,Zhenyi Zhang,Kejing Wu,Yanchun Shi,Weihua Pu,Mingde Yang,Yulong Wu
In this study, a novel carbon nanotube (CNT)-supported CuCo catalyst was successfully synthesized by wet impregnation. Experimental and theoretical results on catalytic deoxygenation of stearic acid , a model compound of microalgal bio-oil, revealed that the CuCo catalyst can effectively inhibit cracking reactions and promote production of diesel-like hydrocarbons. CuCo particles in the pores of CNTs were conducive to conversion of stearic acid to long-chain alkanes, featuring a high selectivity of 94.82% at 100% conversion. CuCo catalyst in oxidation state underwent fast in-situ reduction at the beginning of deoxygenation reaction, and its catalytic performance was comparable to that of reduced CuCo catalyst. The improved catalytic conversion of stearic acid to diesel-like hydrocarbons can be achieved at a high ratio of Cu 0 /(Cu + +Cu 0 ) and lattice Co atoms. In addition, the reduced H 2 pressure and amounts of catalysts show potential for large-scale industrial applications.
研究领域:
化学工程
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催化
·
可再生能源
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Applications in Energy and Combustion Science
·
2021
·
IF 0
Chao Li,Yifan Sun,Lijun Zhang,Qingyang Li,Shu Zhang,Xun Hu
Coal and biomass are two important carbonaceous feedstock and their co-pyrolysis has been proven to modify the fuel properties of resulting oil and char. Nevertheless, how do the volatiles from coal impact the property of biochar from biomass is largely unknown. In this study, sequential pyrolysis of coal in upper bed with sawdust, cellulose, or lignin in lower bed at 600 °C was investigated. The volatiles from the pyrolysis of coal did react with the biochar from biomass, which promoted cracking reactions and resulted in the formation of more gases at expense of biochar. The coal-derived volatiles enhanced the cracking or gasification of sugar derivatives and impacted the evolution of aromatic phenols. Furthermore, coal-derived volatiles also promoted the cracking or deoxygenation of oxygen-containing functionalities, making the biochar carbon-rich with higher crystallinity but reduced the thermal stability. Additionally, the hydrophilicity and the evolution of functionalities on surface biochar was also significantly affected by the volatiles from pyrolysis of coal.
研究领域:
能源与燃料
·
化学工程
·
环境科学
✓ 已验证
DOI
FUEL PROCESSING TECHNOLOGY
·
2022
·
IF 8.129
Xin Ning,Junwen Chen,Qi Zuo,Wenlin Li,Jiajun Zheng,Ruifeng Li
Light alkenes oligomerization , performed in the presence of solid acid catalysts , is an important alternative for the production of clean jet fuels. For 1-hexene oligomerization, the current catalyst often suffers from low activity and selectivity. The developed process is upgraded by zeolite catalyst, targeting high-concentration of jet-range hydrocarbons. An efficient and selective IM-5 zeolite-derived catalytic system has been developed for the oligomerization of 1-hexene. The treatment in an aqueous NH 4 F solution led to dealumination without structure degradation. The IM-5 zeolite with a unique two-dimensional IMF structure and 2.5 nm nanoslab showed rapid diffusion ability than ZSM-5 zeolite. Enhance acidities were observed in the NH 4 F-treated IM-5 zeolites owing to fluoride residue and the removal of Al atoms. The strong Brønsted acid sites exerted a positive effect on both the cracking and the oligomerization reactions with the increasing of the yields of dimers. The contact time and partial pressure between the 1-hexene and the IM-5 zeolites were used to analyze the competition of cracking reactions. High 1-hexene conversion (62%), optimal oligomerization to C 3 -C 5 ratio (O/C = 32), and reasonable stability were obtained over the etched IM-5 catalyst at 240 °C, 4 MPa, and the flow rate of N 2 was 50 mL/min.
研究领域:
化学工程
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催化
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石油化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2020
·
IF 5.006
Xiaoling Zhao,Wei Liu,Jiaqi Wang,Weimin Yang,Xuedong Zhu,Kake Zhu
Silicoaluminophosphates SAPO-41 is a superior unidimensional zeotype catalyst used in hydroisomerization. Generation of hierarchically structured SAPO-41 provides an effective way to promote its hydroisomerization selectivity, which is nonetheless difficult to achieve due to the formation of impurities. Herein, we report crystallization of plate-like crystals of pure phase SAPO-41 in a toluene-aqueous biphasic media in the presence of both Pr 2 NH and oleylamine. The obtained material has a larger adjustable range of silicon content (n Si /(n Al +n Si +n P ) = 0.02−0.15), intermediate acidity and reduced diffusion path length along the micropore channel direction. Catalytic tests for n -heptane hydroisomerization on Pt loaded plate-like SAPO-41 crystals showed that the yield of the isomerized products could reach up to 68 %, with respect to 57 % for a control sample. The selectivities for isomers were found to increase with decreasing Si contents and enhanced diffusion properties, suggesting side β-scission reaction was disfavored at reduced acid site density and shortened diffusion path length.
研究领域:
催化
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材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2024
·
IF 5.8
Mingshuo Chi,Jianpeng Cui,Jianwen Hu,Junjie Fan,Senchang Du,Peiwen Xiao,Songqing Hu,Shuangqing Sun
The enhancement of heavy oil recovery and the promotion of oil-water separation are crucial aspects of fossil fuel resource development. In this study, silica Janus nanosheets were prepared and anchored with Ni nanoparticles for in-situ upgrading and stimulus-responsive demulsification of heavy oil. The results of aquathermolysis reactions revealed that Ni/Ph-SiO 2 -Ni/P4VP Janus nanosheets exhibited excellent characteristics in reducing heavy oil viscosity by 98.49 %, and 99.52 % with the addition of a hydrogen donor. FT-IR, 1 H NMR and GC, etc. analysis of the oil samples indicated that Ni/Ph-SiO 2 -Ni/P4VP breaks the C-S bond and reduces the content of the resin, asphaltene , polycyclic aromatics, and long chain alkanes in the oil. Moreover, it can stabilize heavy oil emulsions in an acidic medium (pH = 2) and separate oil and water in a neutral medium (pH = 7) due to its stimulus-responsive performance. This work highlights the potential application of Ni/Ph-SiO 2 -Ni/P4VP Janus nanosheets for the in situ upgrading and stimulus-responsive demulsification of heavy oil.
研究领域:
材料科学
·
化学工程
·
石油工程
·
纳米技术
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）