FUEL
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2020
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IF 5.578
Long Ma,Shuzhen Chen,Changlei Qin,Susu Chen,Weiyang Yuan,Xu Zhou,Jingyu Ran
Li 4 SiO 4 is a well-acknowledged CO 2 sorbent in the sorption-enhanced reforming system for low-cost H 2 production with a high purity. However, the inevitable presence of H 2 S in the biomass-derived syngas etc. could possibly affect the in-situ CO 2 adsorption significantly, which is important but has never been reported. In this work, the adsorption of CO 2 using Li 4 SiO 4 was investigated under varying H 2 S concentrations and reaction temperatures, and a series of characterization techniques were utilized to understand the effect of H 2 S and its action mechanism. The results show that the presence of H 2 S causes a rapid loss-in-capacity of Li 4 SiO 4 in capturing CO 2 during the cyclic reactions, and a higher concentration greatly exacerbates the problem. Moreover, the negative impact of H 2 S is found to have a strong relationship to the reaction temperature. It is proposed that at 325~475 °C, Li 4 SiO 4 and H 2 S react to form bits of Li 2 S and some kinds of sulfates, and at 625~775 °C, a large amount of dense KLiSO 4 is generated covering the surface of the sorbent. In contrast, at a high temperature above 925 °C, sintering of Li 4 SiO 4 plays a critical role, leading to a significant change on its microstructure.
研究领域:
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
POWDER TECHNOLOGY
·
2023
·
IF 5.2
Yuxiang Cheng,Zhongjie Shen,Feng Lv,Dayang Wan,Yongchuan Gao,Yiru Yang,Haifeng Lu,Zhenghua Dai,Haifeng Liu
During the Ca(OH) 2 /CaO thermochemical energy storage process, the cyclability of reactions and the consolidation properties of powder storage are important issues to consider. In this study, experiments were conducted to assess the evolution of reaction conversion, particle size and penetration resistance of Ca(OH) 2 /CaO powder fixed bed. The results revealed that the final conversions of both the hydration and dehydration reactions stabilized between 70 and 80%. The particle size distributions of Ca(OH) 2 increased initially and then decreased with the increasing cycle number and degree of dehydration. The dehydration conversion was the dominant factor for changing Ca(OH) 2 bed penetration resistance force. The particle size and penetration resistance of the CaO bed remained stable during long-term storage at high temperatures. The theoretical analysis of the inter-particle forces agreed with the trend of the experimental results, with particle size and moisture content being the main factors affecting cohesion.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Kai Mei,Sibo Chen,Wanbei Yang,Gao-Feng Chen,Liang-Xin Ding,Haihui Wang
Utilization of plasma-driven direct nitrogen oxidation for the production of nitrates presents a promising strategy for realizing artificial nitrogen fixation while minimizing carbon emissions. However, the conventional plasma-driven synthesis method employing air as the feed gas exhibits unsatisfactory nitrogen conversion efficiency due to insufficient oxygen. In this study, we introduced carbon dioxide as an additional source of oxygen and mixed it with air, utilizing electrochemically synthesized copper nanoparticles as a catalyst, which significantly improved the efficiency of plasma-driven nitrogen oxidation. The introduction of carbon dioxide not only provides sufficient O* for the nitrogen oxidation process, but also facilitates the high-value conversion of carbon dioxide with 99.99% selectivity in the synthesis of carbon monoxide. Additionally, we also designed a cyclic reaction device to further enhance the nitrogen oxidation efficiency. As a result, this plasma-driven cycle reaction system achieved a maximum nitrogen conversion rate of up to 11.4%.
研究领域:
化学工程
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Green Energy & Environment
·
2019
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IF 0
Yu-Mei Liu,Yan Zhou,Wen-Qiang Gong,Zhang-Min Li,Chao-Li Wang,Duan-Jian Tao
The catalysis of ionic liquids (ILs) in the traditional stirred reactor suffers from insufficient mass and heat transfer, which always needs a long reaction time and results in a low reaction rate. In this work, highly efficient synthesis of 1-methoxy-2-propanol via the alcoholysis reaction of propylene oxide (PO) with methanol was proposed and achieved by the combination of micro-tubular circulating reactor with the IL [N 4444 ][Buty] catalyst. Compared with the stirred reactor, the rate of alcoholysis reaction in a micro-tubular circulating reactor was found to be significantly improved. The reaction time was remarkably shortened to 20 min from 180 min as well as the yield of 1-methoxy-2-propanol reached 92%. Moreover, the kinetic study further demonstrated that the main reaction rate to 1-methoxy-2-propanol (K 1 ) was about 20 times larger than the side reaction rate to byproduct 2-methoxy-1-propanol (K 2 ) in the temperature range of 363–383 K. Such combination of micro-tubular circulating reactor with IL catalysts is believed to be a class of effective process intensification technique for highly efficient synthesis of 1-methoxy-2-propanol.
研究领域:
化学工程
·
催化化学
✓ 已验证
产品关联
DOI
BIOORGANIC CHEMISTRY
·
2020
·
IF 4.831
Zong-Bo Xie,Lei-Han Fu,Jia Meng,Jin Lan,Zhi-Yu Hu,Zhang-Gao Le
A one-pot efficient biocatalytic strategy for the synthesis of 3,4-dihydropyrimidin-2-(1 H )-ones was developed in a circulating microwave reactor selecting α-chymotrypsin as the promiscuous biocatalyst. In the circulating reaction system, the combination of microwave heating and external cooling could avoid the denaturation and inactivation of enzyme, and greatly improved the radiation power of microwave, thus improving the specific effects of microwave. During the reaction process, the microwave radiation power was automatically adjusted by adjusting the speed of the reaction mixture circulation. When the microwave power was maintained at 110 W, the best results could be obtained with the highest yield of 96% at 55 °C in 50 min, and the reaction had a wide range of substrates. But no obvious product was detected in a tank microwave reactor at 55 °C for 100 min, under this condition, the microwave power was maintained at about 3 W. As a contrast, the reaction only obtained 63% yield in 55 °C oil bath for 96 h.
研究领域:
有机化学
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生物催化
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合成化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Science Bulletin
·
2025
·
IF 21.1
Wanguo Gao,Zhe Lu,Yecheng Leng,Chengyang Wu,Yingfang Yao,Xi Zhu,Junchuan Sun,Xiwen Yu,Cheng Wang,Congping Wu,Wenlei Wu,Bing Wang,Lu Wang,Zhigang Zou
Cu-based catalysts attract considerable attention because of their exceptional CO 2 photo-/electro-/thermo-reduction capacities, where Cu(I) is generally treated as the active species. However, a significant problem hindering the large-scale applications of Cu-based catalysts is the inactivation of Cu(I) via irreversible redox to Cu(II)/Cu(0). This study proposes a Cu(I) valence pinning method based on hydroxyapatite (HAP). Experimental and theoretical studies demonstrate that the phonon resonance among the Cu(I) ions, their adjacent heteroatoms, and the intermediates adsorbed at the Cu(I) sites yields Cu(I) valence electrons in their lowest energy states. Thus, Cu(I) is stabilized, stable, and efficient photothermal CO 2 hydrogenation is promoted. However, because of the change of Cu(I) coordination environment during the CO 2 hydrogenation reaction, Cu(I) ions migrate into the bulk phase, leading to activity attenuation. Nevertheless, Cu(I) ions can be pulled out to the surface of HAP under the oxidative humid air condition, and the catalytic activity can be easily recovered. Thus, we propose a simple cyclic reaction/regeneration process. This enables the Ca 5 (FeCuCe) 5 -HAP catalyst to achieve the CO yield of 402.8 mmol g −1 h −1 and a CO 2 conversion rate of 27.7%, which is close to the thermodynamic equilibrium. This catalyst also displays a selectivity of approximately 100% and cycle stability of 156 h at 500 °C under a pressure of 1 atmospheric. Our study provides a viable method for the scale applications of Cu(I) based catalysts in the “negative carbon” industries.
研究领域:
材料科学
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环境科学
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催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Chemistry
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2024
·
IF 14
Qiong Rao,Yuanhui Shen,Ying Pan,Hongguang Jin
Repurposing of carbon dioxide to valuable chemicals and fuels with the assistance of renewable energy is essential for balanced carbon cycle. Here, a new CO 2 conversion strategy was demonstrated that utilized concentrated solar energy to directly drive chemical looping reverse water gas shift process, which simultaneously coupled the photothermal and photochemical effects to achieve enhanced CO 2 reduction reactivity and 100% CO selectivity. The solar-driven chemical looping CO 2 reduction on Ni-Fe 2 O 3 /La 0.8 Sr 0.2 FeO 3 exhibited great activity, with an average CO production rate of up to 0.28 mmol/g oc /min at 283 o C. The product yield of the solar-driven reaction was almost 600% higher than that of the thermal reaction at the same temperature. The CO production overcame the thermodynamic equilibrium limitation under the combined impact of thermal and non-thermal effects of direct-light illumination. Light irradiation reinforced reactive gas adsorption and dissociation of carbonate intermediates, and stimulated oxygen ion migration and lattice oxygen transformation, thus promoting the reactivity. The concept of concentrated solar energy to drive chemical looping reverse water gas shift opens a new avenue for effective CO 2 resource utilization and solar fuel production.
研究领域:
能源化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2020
·
IF 7.1
Yongjun Zheng,Zhenqiang Ning,Deng Pan,Dan Han,Yuan Xu,Songqin Liu,Yuanjian Zhang,Yanfei Shen
Human NAD(P)H:quinone oxidoreductase 1 (hNQO1), a proteinase that engages in detoxification of quinones and capable of activating anti-tumor drugs, has drawn increasing attention as tumor biomarker and drug target. Despite significant advances, the detection of hNQO1 up to now primarily relies on stimulus-responsive probes involving metabolization of a complicated synthetic quinone-functionalized probe, which, however, remains challenging to improve the sensing sensitivity, and are lack of sufficient stability. Herein, we report a highly sensitive electrochemiluminescent detection of hNQO1 and associated drug screening by straightforward sensing of the metabolin, enabled by a futile redox cycle reaction. Thanks to the intrinsic circulatory amplification and the luminol-modified nickel foam electrode, the electrochemiluminescent (ECL) sensor exhibited a record-level detection limit (10 ng/mL) and SNR (∼460) for hNQO1. The same format was also successfully applied to rapidly ranking hNQO1-directed anti-tumor drugs down to several-ten minutes. This new strategy would open a new era for hNQO1 detection with uncompromised high performance and also stimulate ECL as a promising tool that combines both diagnostic and drug screening functions for the popularization of proteinases in cancer management in a future application.
研究领域:
生物化学
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分析化学
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癌症研究
·
药物发现
✓ 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）