FUEL PROCESSING TECHNOLOGY
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2022
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IF 8.129
Xiudong Zhu,Yunshan Shang,Jingyun Chen,Hui Wei,Deping Xu,Xiongchao Lin,Yonggang Wang
A series of lanthanum oxide modified Cu Co based catalysts for the direct conversion of syngas to higher alcohols were synthesized via the coprecipitation method. The influence of lanthanum on the textural properties and catalytic performance was investigated. It was found that lanthanum-modified Cu Co based catalysts possessed a novel nanosheet structure to form more oxygen vacancies . Compared with CuCo catalyst, the dissociative CO adsorption and associative CO adsorption capacities of La x CuCo catalysts were improved markedly, and formate and methoxy intermediates were more easily formed on the surface of La x CuCo catalysts, which is attributed to the proper synergy of the surface active sites (Cu 0 , Co 0 , and oxygen vacancies). In particular, the addition of lanthanum species reduced the thickness of the nanosheets and facilitated the high dispersion of La x CuCo after reaction by acting as isolation islands to restrain the aggregation and growth of crystal grain. The evaluation results showed that optimized La 0.3 CuCo catalyst exhibited the highest CO conversion of 25.4%, superior total alcohols selectivity of 61.4%, and C 2+ alcohols selectivity of 79.03% among the total alcohol products, and excellent stability.
研究领域:
催化化学
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材料科学
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2024
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IF 15.7
Yanru Zhu,Zhijun Zhang,Jian Zhang,Shuangjiang Jiang,Zhe An,Hongyan Song,Xin Shu,Wei Xi,Lirong Zheng,Jing He
ABSTRACT Photosynthesis is a potential strategy to enable endergonic process that usually needs high-temperature in thermochemistry to supply the energy for inert-bond activation and/or strong endothermic reaction . The conversion of CO 2 into value-added C 2 -oxygenates is a promising process to realize artificial photosynthesis , but suffers from relatively lower efficiency due to complex multi-electron (≥ 10) transfer processes and sluggish kinetics of C–C coupling. This work proposes an all-new H 2 O-promoted strategy for efficient production of C 2 oxygenates from the concurrent activation and subsequent co-conversion of CO 2 with CH 4 under photo-thermal cooperation, in which photocatalytic H 2 O-splitting derived active hydrogen species for CO 2 activation, and concomitant active oxygen species for CH 4 activation. A formation rate of as high as 2.05 mmol g −1 h −1 for C 2 -oxygenates (CH 3 CHO and CH 3 CH 2 OH) in a selectivity of > 86% has been afforded over SrTiO x supported CuCo under 200 °C and ultraviolet-visible illumination. It has been revealed that SrTiO x drives photocatalytic H 2 O-splitting under the excitation primary from ultraviolet light, paired Cu I /Cu 0 sites promote the formation of *CH x O intermediate from CO 2 , Co sites conduct CH 4 -to-*CH 3 , and C–C coupling of *CH x O and *CH 3 on adjacent Cu-Co facilitates the generation of C 2 -oxygenates.
研究领域:
化学工程
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催化科学
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能源转换
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2024
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IF 3.7
Antai Kang,Jiangtao Li,Yubin Li,Min Cao,Li Qiu,Bo Qin,Yanze Du,Feng Yu,Sha Li,Ruifeng Li,Xiaoliang Yan
Bimetallic CuCo catalysts with different Cu to Co ratios on N-doped porous carbon materials (N-C) were achieved using impregnation method and applied in the hydrogenation of furfural (FAL) to furfuryl alcohol (FOL). The high hydrogenation activity of FAL over Cu 1 Co 1 /N-C was originated from the synergistic interactions of Cu and Co species, where Co 0 and Cu 0 simultaneously adsorb and activate H 2 , and Cu + served as Lewis acid sites to activate C═O. Meanwhile, electrons transfer from Cu to Co promoted the formation of Cu + . In situ Fourier transform infrared spectroscopy analysis indicated that Cu 1 Co 1 /N-C adsorbed FAL with a tilted η 1 -(O) configuration. The superior Cu 1 Co 1 /N-C showed excellent adsorbed ability towards H 2 and FAL, but weak adsorption for FOL. Therefore, Cu 1 Co 1 /N-C possessed 93.1% FAL conversion and 99.0% FOL selectivity after 5 h reaction, which also exhibited satisfactory reusability in FAL hydrogenation for five cycles.
研究领域:
催化化学
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材料科学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2025
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IF 6.9
Yi Li,Shiyin Ji,Yangzhou Fan,Tao Duan,Youkui Zhang
The Haber-Bosch process for ammonia synthesis is energy-intensive and environmentally damaging, while nitrate wastewater poses risks to both the environment and human health. Utilizing electrochemical method could remove nitrate in the sewage and a part of nitrate would been reduced to ammonia provided a highly efficient approach for nitrate removal and ammonia synthesis. In this study, incorporated Cu and Co on boron-nitrogen-doped graphite (BCN) substrate with eminent conductivity synthesized BCN-CuCo catalyst. On the catalyst, Cu and Co gave rise to synergistic effect which aroused charge redistribution between Cu and Co, which facilitated the nitrate adsorption, accelerated catalytic kinetics for nitrate reduction. BCN-CuCo catalyst demonstrated eminent performance for nitrate reduction, achieving a high Faradic efficiency of 95.8 % at −0.46 V vs RHE and an impressive ammonia yield rate of 12321.6 μg h −1 mg cat -1 at −0.86 V vs RHE in 0.5 M H 2 SO 4 with 0.1 M KNO 3 . It also showed excellent performance in HNO 3 and neutral media, expanding its application scope. Ultimately, the BCN-CuCo facilitated the production of 320 mg of ammonium diuranate in a neutral medium, supporting sustainable resource utilization. This research provides an efficient strategy for ammonia synthesis and introduces a method for recycling resources from uranium and nitrate-contaminated wastewater.
研究领域:
环境科学
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电化学
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材料科学
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产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
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2019
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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
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可再生能源
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纳米技术
✓ 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）