SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Haozhan Chu,Shaojuan Zeng,Xiangping Zhang,Guoxiong Zhan,Bo Wang,Hongyu Zhang,Sheng Zhong,Wei Liu
Ionic liquids (ILs) show great application potentials in CO 2 capture due to extremely low vapor pressures, tunable structures, and strong CO 2 affinity. Up to date, many efforts have been focused on the design and absorption performance of novel functionalized ILs, rather than desorption performance. In our previous work, the IL solvent [Cho][Triz]/TMS exhibited exceptional CO 2 absorption performance. As a successive study on decreasing regeneration energy consumption, this work focused on the design and synthesis of novel metal-modified MCM-41 catalysts with multiple acidic sites to enhance CO 2 catalytic desorption in the nonaqueous [Cho][Triz]/TMS (80 wt%/20 wt%) absorbent under lower temperatures. Among all the composite MCM-41 catalysts, the CoM-1/4 catalyst exhibits superior catalytic performance because of the increase of Brønsted acid sites by 232.3 % and Lewis acid sites by 56.2 % compared with pristine MCM-41, which promote CO 2 desorption by accelerating C-N bond breaking. The CO 2 desorption rate and amount increased by 180.2 % and 95.7 %, and the activation energy reduced by 46.7 % compared to the non-catalysis. Therefore, the theoretical regeneration energy consumption of the catalyst-added system was 0.88 GJ/t CO 2 , representing a 76.7 % reduction compared with the 30 wt% MEA solution. Furthermore, the CoM-1/4 catalyst maintained high catalytic activity after 20 cycles. This work indicated that the CoM-1/4 catalyst effectively enhanced the regeneration performance of IL absorbent, facilitating the development of an energy-efficient CO 2 capture process for industrial applications.
研究领域:
化学工程
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环境科学
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催化材料
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Huijie Lu,Ting Zhang,Tianyu Lu,Bin Yang,Xiaohong Wang,Ru Xia,Jiaojiao Sang,Qiangwei Liu,Jiasheng Qian,Yuqing Yang,Ning Jia
As the integration of electronic devices continues to increase, the heat generated by electronic components presents significant thermal management challenges. Thermal interface materials thus play more and more crucial role in ensuring the reliability of electronic devices. Cobalt nanoparticles (Co) were first coated onto the surface of graphene nanosheets (GNS) and grafted with maleimide (MI) to form Co@MI-GNS filler. This filler was then evenly dispersed in a carboxylated nanocellulose (CNF) matrix, and a series of Co@MI-GNS/CNF thermally conductive composite films were successfully fabricated using a layer-by-layer (LBL) self-assembly method. During the preparation process, the “C-N-C” covalent bonds were in-situ formed, enhancing the establishment of stable hydrogen bonds between the fillers and the matrix. As compared to other fabrication methods, such as blade coating or template drying, the Co@MI-GNS/CNF films produced by this approach indeed exhibited superior thermal conductivity (TC). The interfacial thermal resistance of the composite films was obtained as 9.41×10 -10 m²·K·W -1 using the Foygel model, indicating a significant improvement on the thermal transfer efficiency. Theoretical predictions were found to be consistent with thermal dissipation tests conducted on light emitting diode and computer central processing unit. The LBL self assembly proved to be a promising technique for fabricating polymer-based TIMs with ultra-high in-plane TC as well as excellent mechanical flexibility, making it particularly suitable for flexible electronic devices.
研究领域:
材料科学
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热管理技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2018
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IF 6.735
Fangzhou Ji,Heng Zhang,Xinxing Wei,Yunhong Zhang,Bo Lai
A heterogeneous catalyst, cobalt-modified natural zeolite prepared by electroless plating technique (ECM-Co-NZ), was fabricated as a peroxymonosulfate (PMS) activator for enhancing the oxidative degradation of atrazine (ATZ) in aqueous media. SEM, EDS, BET, XRD, Py-DRIFT, H 2 -TPR and XPS techniques were applied to characterize the features of the synthesized catalyst and conventional impregnation sample for comparison. Then, the catalytic activity and recyclability of two materials were investigated comparatively. The results show that ECM-Co-NZ has a better catalytic performance as well as a longer operational life, and complete removal of ATZ can be achieved in 14 min in ECM-Co-NZ/PMS system. Further, the effects of key factors including Co mass loading, calcination temperature, catalyst dosage, PMS dosage, initial pH and ATZ concentration on ATZ removal and Co leaching in ECM-Co-NZ/PMS system were elucidated in details. In addition, reactive oxygen species generated in the oxidation process were identified by radical scavenging test, byproduct detection and fluorescent probe technique. The results reveal that both hydroxyl and sulfate radicals were contributed to the degradation of ATZ, but sulfate radical had dominant role in controlling the ECM-Co-NZ/PMS oxidation system. Finally, the reaction mechanism and possible ATZ degradation pathways were discussed based on the experiment results and previous literature.
研究领域:
环境科学
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催化化学
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产品关联
DOI
高影响因子
JOURNAL OF SUPERCRITICAL FLUIDS
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2020
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IF 3.744
Jie Sun,Lujiang Xu,Guo-hua Dong,Sonil Nanda,Hu Li,Zhen Fang,Janusz A. Kozinski,Ajay K. Dalai
Nickel-based catalysts with different supports and cobalt loadings were synthesized for hydrothermal gasification of cellulose at 350 °C. The activity of Ni catalysts was found in the order of Al 2 O 3 > spent bleaching clay ash > SiO 2 with H 2 yield of 80.6%, 69.0% and 57.0%. When 6 wt. % Co was added, 10Ni-6Co/Al 2 O 3 showed the highest H 2 yield of 88.4% i.e., 1.44 times that without Co addition. Catalysts were characterized by NH 3 -TPD, TPR, XRD, BET and XPS, showing that Ni-Co alloy formation promoted H 2 production. Single-factor experiments were conducted to study variables in the presence of 10Ni-6Co/Al 2 O 3 with the selected conditions of 0.5 g biomass and 20 min at 350 °C (achieving 94.9% H 2 yield from cellulose) for gasification of rice straw, peanut shell and cotton straw with the increase in H 2 yield by 51.4, 76.0 and 67.8 times. Ni-Co/Al 2 O 3 catalysts enhanced hydrothermal gasification of actual agricultural residues.
研究领域:
化学工程
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环境科学
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催化
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可再生能源
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）