FUEL
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2022
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IF 8.035
Xin Huang,Zhongqing Yang,Jiaqi Qiu,Bo Tang,Changlei Qin,Yunfei Yan,Jingyu Ran
Ethylene is a valuable and widely used platform in industrial chemical. Herein, we report a potential route for selective and efficient ethylene production via chemical looping oxidative dehydrogenation of ethane using alkaline, rare earth and transition metals modified BaCoO 3 perovskite as the circulative redox catalyst. The catalysts were characterized by XRD, XPS, SEM, TEM, N 2 adsorption-desorption, H 2 -TPR, and O 2 -TPD analyses. Results showed that ethane conversion and ethylene selectivity were mainly regulated by lattice oxygen and Co valence of the catalysts, respectively. Doping of La to A-site of BaCoO 3 promoted ethane conversion while doping of Cu to B-site contributed to ethylene selectivity. Both ethane conversion and ethylene selectivity were enhanced by the co-doping of La and Cu to A/B-site of BaCoO 3 , obtaining the highest selectivity of 81.2% at ethane conversion of 67.6%. The ethylene yield over Ba 0.7 La 0.3 Co 0.8 Cu 0.2 O 3 was 7.9% higher than that over patent BaCoO 3 (53.7% versus 45.8%). In addition, the Ba 0.7 La 0.3 Co 0.8 Cu 0.2 O 3 catalyst also exhibited a stable catalytic performance during 12 redox recycles.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
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2021
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IF 7.92
Pingping Xie,Xin Yong,Yongdan Li,Shetian Liu,Cuijuan Zhang
The 5%BaCoO 3 -CeO 2 catalysts show excellent catalytic performance for NO direct decomposition; however, the reasons for the high activity remain to be explored. Here, the catalyst was prepared by different methods (citric acid–nitrate one-pot method, impregnation method and mechanical mixing method), aiming to reveal the factors determining the catalytic activity. The results show that the one-pot derived materials display superior activity and oxygen resistance, which is stemmed from the smaller grains and uniform distribution of components, higher surface area, larger interface, better redox activity, faster oxygen desorption kinetics and better NO sorption capability. The catalytic mechanism was discussed based on the diffuse reflectance infrared Fourier transform spectroscopy and kinetic study . This work demonstrates that the one-pot method is promising to synthesize high performance heterogeneous catalysts and the derived 5%BaCoO 3 -CeO 2 is a competitive candidate for NO direct decomposition.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Shujun Peng,Song Lei,Sisi Wen,Guowei Weng,Kun Ouyang,Zongjie Yin,Jian Xue,Haihui Wang
Proton conducting solid oxide fuel cells (H–SOFCs) have attracted much interest for their various advantages. BaZr 0.1 Ce 0.7 Y 0.1 Yb 0.1 O 3-δ (BZCYYb) displays both good proton conductivity and stability among all of the barium zirconate-cerate oxides such as BaZr 0.1 Ce 0.7 Y 0.2 O 3-δ (BZCY) with proton conducting. In this study, an Fe and Ta co-doped perovskite-type oxide with the composition of BaCo 0.7 Fe 0.2 Ta 0.1 O 3-δ (BCFT) is synthesized by the solid state reaction (SSR) method and studied as a high-performance cathode for H–SOFCs operated between 650 and 800 °C. The BCFT is chemically compatible with BZCYYb electrolyte, even co-sintering at 1000 °C for 10 h. The activating energy (Ea) of electrical conductivity for the BCFT sample is only 0.038 eV. The BCFT demonstrates superior oxygen reduction reaction (ORR) kinetics than that of BaCo 0.7 Fe 0.2 Nb 0.1 O 3-δ (BCFN), when the Nb is completely substituted by Ta. The Ea of the polarization resistance (Rp) for BCFT is 0.911 eV, which is 0.11 eV lower than that of BCFN. The peak power density (PPD) of the anode-supported H–SOFC using BCFT is 1.65 W cm −2 and the Rp is 0.01 Ω cm 2 at 800 °C. Therefore, the BCFT is a promising cathode for H–SOFCs based on BZCYYb electrolyte.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2026
·
IF 7.8
Yeku Wang,Shengxin Li,Xinran Xia,Fan Chen,Min Deng,Lijuan Zhang,Ruijie Zhu,Hongzhi Liu,Ahmed ElSheikh,Nan Sheng,Chunyu Zhu
The development of high-performance materials that integrate thermal energy storage and oxygen production is essential for advancing sustainable, low-carbon energy systems. BaCoO 3− δ (BCO) utilizes reversible redox reactions in air to enable chemical looping for simultaneous thermochemical heat storage and air separation. This process synergistically stores solar energy through combined sensible and thermochemical mechanisms, significantly enhancing thermal storage density in concentrated solar power (CSP) plants, thereby improving their efficiency and sustainability. Moreover, the lattice oxygen released during the reduction phase can be directly utilized for oxygen-enriched combustion integrated with supercritical CO 2 power cycles, which reduces fossil fuel consumption and carbon emissions. Comprehensive thermodynamic and kinetic analysis of BCO powder synthesized via solid-state reaction revealed a reaction enthalpy of 171.8J/g, a total heat storage capacity of 383.21 J/g within 1073–1273 K, and an oxygen storage capacity of 1562.5 µmol-O/g. The redox kinetics followed shrinking-core reduction and second-order oxidation models, demonstrating exceptional cycling reversibility. To overcome powder mechanical limitations while preserving reaction characteristics, BCO ball-shaped granules and honeycomb porous foams were fabricated via single-step forming. Thermochemical cycling tests confirmed complete structural integrity and dimensional stability over 56 cycles between 973 and 1273 K in air, with no detectable degradation. These findings establish BCO-based materials as a transformative solution for high-efficiency, environmentally sustainable energy systems, effectively bridging solar energy utilization with clean combustion technology to support a greener energy infrastructure.
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
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2023
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IF 4.6
Dehuo Zhou,Fuhe Le,Wei Jia,Xianhao Chen
The successful preparation of a perovskite-based heterostructure is important for broadening the applications of perovskites in the field of electrocatalysis, especially in a hydrogen evolution reaction (HER). Nevertheless, the limited active sites of perovskites severely hindered the HER properties. Herein, an in situ exsolution method was used to construct a nanocomposite based on V-doped BaCoO3−δ decorated with Ba3(VO4)2 (BVCO19) for alkaline HER. The exsolved Ba3(VO4)2 can induce more Co4+ ions on BaCoO3−δ, which serves as active sites for the release of H2. Meanwhile, by regulating the valency of V and Co species, the catalyst can reach a charge balance by generating more oxygen vacancies, which greatly facilitates the adsorption and dissociation of H2O molecules. The synergistic effect between the oxygen vacancies and high-valence Co4+ leads to an enhanced HER performance of BVCO19. The as-obtained catalyst delivers a low overpotential of 194 mV at 10 mA cm–2 as well as impressive stability for 100 h in alkaline media, which outperforms pristine BaCoO3−δ and most of the nonprecious-based perovskite oxides. This work provides new insights into the preparation of perovskite-based heterostructure for boosting HER.
研究领域:
材料科学
·
电催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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