CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Liang Chen,Zhenghao Wang,Xinyang He,Gang Zhi,Kailong Zhang,Liping Cao,Dongmei Luo,Bin Liang
The pursuit of efficient hydrogen production has driven the development of chemical looping hydrogen generation (CLHG), a promising technology that converts low–calorific–value reducing gases into high–purity hydrogen with minimal environmental impact. However, the limited activity and high cost of oxygen carriers (OCs) have hindered the broader adoption of CLHG. In this study, efficient and low–cost magnetite–based OCs were developed through pre-oxidation and transition metal modification. The results showed that pre–oxidation of magnetite at 900 °C for 2 h significantly increased oxygen vacancy concentration and porosity, boosting hydrogen yield from 0.64 mmol‧g −1 to 3.65 mmol‧g −1 . Further modification with nickel led to a twelvefold enhancement in hydrogen production, achieving 7.60 mmol‧g −1 at 650 °C. Notably, the purity of generated hydrogen exceeded 99.50 % without additional separation procedures. This study also identified sintering as a primary deactivation mechanism, which can be mitigated with an oxygen–assisted regeneration strategy. These findings offer valuable insights for developing efficient OCs and high–purity hydrogen generation from industrial off–gas.
研究领域:
能源材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Li Liang,Xiaode Guo,Xin Liao,Zhipeng Chang
To improve the interface incompatibility, poor corrosion resistance, and limited combustion efficiency of aluminum powder for propellant applications. The surface of the naked aluminum was coated with a layer of dense nickel of about 100 nm by replacement method. A polydopamine film was then deposited by self-polymerization. The double-layer structure and chemical composition were investigated. The polydopamine content of composite particles was 2.3% by thermal analysis. And its heat release around 1050 °C reached 4137 J g −1 , which was much higher than that of aluminum of 1644 J g −1 . The surface energies was used to calculate the theoretical adhesion work of aluminum and composite particles to propellant binder. The adhesion work after modification was increased from 62.33 mN m −1 to 74.89 mN m −1 . No matter in the weak acid/alkaline or neutral environment, the composite particles exhibited excellent stability at 50 °C. In addition, the combustion test revealed that the composite particles had higher combustion efficiency, smaller condensed phase product size, and stronger ignition ability. All the conclusions indicate after modification by nickel and dopamine, the comprehensive performance of aluminum is improved, and it may be used as an energy component in propellants or other energetic fields.
研究领域:
材料科学
·
化学工程
·
推进剂技术
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2018
·
IF 5.807
Leilei Dai,Yunpu Wang,Yuhuan Liu,Roger Ruan,Dengle Duan,Yunfeng Zhao,Zhenting Yu,Lin Jiang
Catalytic fast pyrolysis (CFP) of torrefied corn cob using Ni-modified hierarchical ZSM-5 catalyst was conducted in this study. The prepared catalysts were characterized by N 2 adsorption and desorption (N 2 -BET), X-ray diffraction (XRD), and temperature-programmed desorption of NH 3 (NH 3 -TPD). NaOH solution treatment resulted in the lower peak intensities of hierarchical ZSM-5 catalyst in the XRD patterns while Ni modification improved the catalyst framework. In addition, NaOH solution treatment created some mesopores or macropores, but the incorporation of Ni reduced BET surface area and volume of micropores. Though the addition of Ni lowered the acidity of catalyst, Ni-modified hierarchical ZSM-5 catalyst led to higher yields and of aromatic hydrocarbons. What is more, hierarchical ZSM-5 catalysts significantly improved the selectivities of mono-aromatics. Kinetic analysis shows that CFP of torrefied corn cob was second-order reaction and the addition of Ni can obtain a lower activation energy compared with hierarchical ZSM-5 catalyst.
研究领域:
化学工程
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Xiaowei Kong,Yu Tian,Xiaoliang Zhou,Xiaoyan Wu,Jun Zhang
It has been found in our previous study that La 0.9 Ca 0.1 Fe 0.9 Nb 0.1 O 3-δ -Sm 0.2 Ce 0.8 O 1.9 (LCFNb-SDC) anode shows high catalytic activity and stability for solid oxide fuel cells (SOFCs) under H 2 and CO atmospheres. In this study, LCFNb-SDC is further tuned into a promising anode for direct methane SOFCs through surface modification with Ni. The LCFNb, SDC and Ni materials are found to be thermal-mechanically and chemically compatible with each other up to 850 °C. Although LCFNb-SDC anode shows poor catalytic activity for methane oxidation , further modification of such anode with a small amount of Ni particles significantly improves the cell performance in CH 4 . The maximal power densities of 1031 and 729 mW cm −2 in H 2 and CH 4 have been achieved for the electrolyte supported SOFC with LCFNb-SDC-Ni|SSZ (Sc 0.2 Zr 0.8 O 2−δ )|LSM (La 0.8 Sr 0.2 MnO 3 ) configuration at 850 °C, respectively. Besides, the same cells also exhibit good stabilities in both H 2 (500 h) and CH 4 (100 h) with no obvious performance degradation and carbon deposition. Surface tuned LCFNb anode by impregnating SDC and a small amount of Ni is thus highly promising as an anode for direct methane SOFCs to deliver favorable performance with reasonable stability.
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
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Yilin Zhang,Yanhui Long,Kaiyi Wang,Xiaosong An,Liboting Gao,Zijiang Zhao,Jianhua Yan,Hao Zhang
Developing alternatives to the energy-intensive Haber–Bosch (H–B) process for ammonia synthesis is imperative yet challenging. Herein, Ni-modified zeolitic imidazolate framework (ZIF) Ni@ZIF-67 nanocrystals were synthesized and applied in a dielectric barrier discharge reactor for plasma-assisted ammonia synthesis under ambient pressure. Introducing ZIF-67 into the plasma enhanced the ammonia synthesis rate by an order of magnitude, evidencing strong plasma–catalyst synergism. The superior performance was attributed to the unique microstructure featuring a high specific surface area and abundant porosity, which improved gas adsorption and intensified microdischarge within the plasma. Further incorporation of Ni into ZIF-67 (Ni@ZIF-67) resulted in a maximum ammonia synthesis rate of 289.45 μmol g–1 min–1 and an energy yield of 1.83 g kWh–1─a 32.0% improvement over ZIF-67─while maintaining structural stability over repeated cycles. Moreover, the confinement of NH3 within sub-Debye-length micropores suppressed plasma-induced decomposition. The addition of Ni further significantly boosted both the hydrogen/ammonia adsorption capability and discharge efficiency, which promoted ammonia formation, especially in a H2-rich atmosphere. These findings underscored the potential of Ni@ZIF-67 as a promising catalyst for plasma-assisted ammonia synthesis, providing a viable alternative to the conventional H–B process.
研究领域:
催化
·
等离子体化学
·
材料科学
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Yuanhui Shen,Yunlian Liu,Ying Pan,Hongguang Jin
Chemical looping dry reforming of methane (CL-DRM) represents an innovative CO 2 utilization technology that enables efficient conversion of CH 4 and CO 2 while producing high-quality syngas. To investigate the carbon resistance of oxygen carriers, we present a comprehensive analysis of carbon deposition mechanisms in CL-DRM from both thermodynamic and experimental perspectives, establishing a quantitative correlation between carbon deposition and oxygen carrier characteristics. Experimental validation confirmed the thermodynamic predictions. Utilizing an exsolution strategy, we successfully synthesized nano-Ni-modified iron-based perovskite, which demonstrated exceptional reactivity and carbon resistance at 800 °C. This work provides both theoretical and practical guidance for the development of advanced oxygen carriers in CL-DRM systems.
研究领域:
能源工程
·
化学工程
·
材料科学
·
环境科学
·
催化
✓ 已验证
DOI
高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Dai Xiaojun,Cheng Yan,Si Meng,Wei Qiang,Zhou Yasong
The complexation-excessive impregnation modification method, which was original in this study, and the ion-exchange method and the in situ modification method were used to synthesize Ni-modified SAPO-11 molecular sieves. With the Ni-modified SAPO-11 samples as support, the corresponding NiWS-supported catalysts for the hydroisomerization of n-hexadecane were prepared. The effects of Ni-modification on SAPO-11 characteristics and the active phase were studied. The structure, morphology, and acidity of SAPO-11, as well as the interaction between active metals and support, the morphology, dispersibility, and stacking number of the active phase, were all changed by Ni-modification methods. The complexation-excessive impregnation modification method deleted a portion of Al from SAPO-11 molecular sieves while simultaneously integrating Ni into the skeletal structure of the surface layer of SAPO-11 molecular sieves, considerably enhancing the acidity of SAPO-11 molecular sieves. Furthermore, during dealumination, ethylenediaminetetraacetic acid generated more mesoporous structures and increased the mesoporous volume of SAPO-11 molecular sieves. Because the complexation-excessive impregnation modification method increased the amount of Ni in the surface framework of the SAPO-11 molecular sieve, it has weakened the interaction between the active phase and the support, improved the properties of the active phase, and greatly improved the hydroisomerization performance of NiW/NiSAPO-11. The yield of i-hexadecane of NiW/NiSAPO-11 increased by 39.3% when compared to NiW/NiSAPO-11. It presented a realistic approach for increasing the acidity of SAPO-11, reducing the interaction between active metals and support, and improving the active phase stacking problem.
研究领域:
催化
·
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）