CATALYSIS LETTERS
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2019
·Vol. 150
·期 6
·1591-1604
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IF 2.372
Du Boyu,Chen Changzhou,Sun Yang,Liu Bingyang,Yang Yingying,Gao Si,Zhang Zhenshu,Wang Xing,Zhou Jinghui
Abstract Catalytic depolymerization of lignin to produce bio-oil, liquid fuels, and aromatic chemicals in high yields is important for a biorefinery to remain competitive. In this study, undoped and Ni-doped catalysts for depolymerization of rice husk lignin (RHL) were developed and analyzed. The results showed that the catalysts had hydrotalcite-like structures with lamellar morphology. With suitable Ni-doping amount, the catalysts had high activity, thus better promoted the depolymerization of RHL. Among all catalysts, the Ni1/4MgAl catalyst could best promote the cleavage of the β-O-4 aryl ether bond in RHL molecule and thus could substantially increase the yields of bio-oil. The depolymerization catalyzed by this catalyst was also found to be temperature-, time-, and solvent-dependent. This study provides information that can be beneficial to the biorefinery industries and may help promote the valorization of lignin. Graphic Abstract
研究领域:
生物质能
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催化化学
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可再生资源
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2026
·
IF 3.9
Dawei Zhang,Lei Huang,Haoyu Li,Menglin Niu,Zeeshan Abbasi,Yue Li,Tongqi Ye,Xuelan Hou,Maofeng Zhang,Jie Ren
The development of high-activity Ni-based catalysts for efficient CO2 methanation remains challenging, primarily due to Ni particle aggregation under high loading conditions, which limits their long-term stability at low temperature. To address this issue, this work evaluates the effect of doping with typical metals M (i.e., Co, La, Fe, and Ce) on the properties of Ni–Mg–Al layered double oxides (LDOs). The Ni–Co LDO (Ni/Co = 18:2, wt%), with the lowest activation energy (i.e., 54.5 kJ/mol), achieved 80% CO2 conversion and 99.9% CH4 selectivity at 350 °C, while Ni–La LDO only showed 73% CO2 conversion. The catalytic performance of optimized Ni–Co LDO is also quite stable under a 140 h time-on-stream thermal shock evaluation. Comprehensive characterization reveals that Co doping is particularly effective in generating abundant oxygen vacancies, creating numerous interfacial basic sites and stabilizing small Ni particles. In situ DRIFTS analysis further elucidates the resulting differences in reaction intermediates, pathways, and coordination environments, linking the enhanced structural properties to superior catalytic performance.
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DOI
高影响因子
CERAMICS INTERNATIONAL
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2025
·
IF 5.6
Fanlin Kong,Yi liu,Shiyu Cao,Huimin Chen,Yanwei Fan,Junhua Wang,Jincheng Yao,Aimin Chang
In this study, single-phase high-entropy ceramics (HECs) with the composition (Co,Mn,Fe,Zn,Ni,Mg,Al,Cr) 3 O 4 were successfully synthesized using five different types of spinel raw materials. The resulting material demonstrates excellent performance in the negative temperature coefficient (NTC) thermistor field. X-ray diffraction (XRD) analysis confirmed the structure as a cubic spinel with a single Fd-3m space group. The electron microscope image reveals the growth of ceramic grains with increasing sintering temperature, with a uniform distribution of all elements. After 1800 h of accelerated aging at 150 °C, the Δ R / R 0 value was only 0.41 %, indicating the ceramic's exceptional structural stability. X-ray photoelectron spectroscopy(XPS) analysis reveals that electrical conductivity are mainly governed by electron hopping between Mn 3+ and Mn 4+ ions in the octahedral sublattice sites. Impedance spectroscopy further shows that grain boundary resistance is the dominant contributor to the total resistance. This study provides new insights into the synthesis of single-phase HECs materials and proposes strategies to enhance material stability for future applications.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
Journal of Cleaner Production
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2020
·
IF 7.246
Shanshan Shao,Xinggang Hu,Wenbin Dong,Xiaohua Li,Huiyan Zhang,Rui Xiao,Yixi Cai
Aldol condensation of biomass-derives coupled with hydrogenation is a promising route for the production of renewable aviation fuel. In this study, a bifunctional catalyst was prepared to integrate the aldol condensation of cyclopentanone and hydroprocessing for aviation fuel in one pot. Due to its strong mild-basic sites, Mg–Al–O performed the best with the total yield of dimer and trimer of 80.4%. Nickel was screened out to be favorable for hydrogenation. Considering the unsatisfactory porous structure of Ni/Mg–Al–O, the bifunctional catalyst was prepared with activated carbon (AC) as carrier. With Ni loading of 20 wt%, the maximum yield of targeted alkanes reached 81.1% over Ni/Mg–Al–O/AC. The calcination and reduction temperature in the preparation process were both optimized at 550 °C. In the reusability test, the yield of targeted alkanes reduced to 31.6% in the 5th run. To attenuate the hydration effect, n-pentane was introduced as solvent, and the bifunctional Ni/Mg–Al–O/AC performed stably in 5 runs. By the design of bifunctional catalyst based on the theoretical basis to realize the integration of C–C coupling and hydrogenation in one pot, it will promote the development of aviation fuel from biomass in a more sustainable and green way.
研究领域:
催化化学
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能源化学
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绿色化学
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生物燃料
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应用化学
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材料化学
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工业催化
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DOI
高影响因子
ENERGY CONVERSION AND MANAGEMENT
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2019
·
IF 7.181
Fan Zhou,Ningyi Pan,Hongyu Chen,Xiang Xu,Chunhao Wang,Yankun Du,Yang Guo,Zheng Zeng,Liqing Li
Ni-Mg-Al hydrotalcite-derived materials promoted with Ce, Zr or Fe were prepared by the co-precipitation method, which exhibited excellent performance in steam reforming of toluene (SRT) at low temperature. Especially, Fe-doped catalyst had higher catalytic activity and stability at 400 °C, which maintained almost 100% toluene conversion during the SRT reaction (3 h). Moreover, it also had higher hydrogen production and better selectivity for hydrogen production. The physico-chemical characterizations and model simulation indicate its high dispersion of active sites and accessibility of reactants to active sites: uniform dispersion of active sites (SEM, TEM and EDX), large specific surface area (151 m 2 /g), pore volume (0.84 cm 3 /g) and average pore diameter (22.1 nm), small crystallite size (34.9 nm), desirable Ni species reducibility (TPR), high basicity (TPD), low metal carbide formation (XPS), and good adsorption affinity with toluene (−18.391 kJ mol −1 , DFT). Moreover, less carbon was deposited on the Fe-containing catalyst through measuring the amorphous carbon and CNTs by the TG-MS method, which was due to the tip-growth mechanism of CNTs. Considering lower toluene conversion temperature, higher hydrogen yield, and better resistance to carbon deposition, this study may be meaningful in development of SRT at low temperature.
研究领域:
化学工程
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催化科学
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产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Shanshan Shao,Zian Ye,Xinggang Hu,Jiayuan Sun,Xiaohua Li,Huiyan Zhang
It is a simple, green, and energy-saving way to produce targeted alkanes in the range of jet fuel from biomass-derived carbonyls by aldol condensation and hydrogenation in one pot over the bifunctional catalyst. The catalyst and solvent system played a significant role in this. It was discovered that Ni was preferentially loaded on the region centered on the weak basic sites. The amount of weak and medium basic sites gradually decreased as Ni occupied the region, and the aldol condensation performance was inhibited. The aldol condensation was favored in the aqueous solvent compared with that in the organic solvent. Some condensates presented insoluble in the aqueous solvent, and the hydrogenation performance was weakened, resulting in a poor yield of 48.2% for the targeted alkanes. In order to strike a balance between aldol condensation and hydrogenation in the organic and aqueous solvent, the biphasic solvent system was proposed. The results showed that the total yield of targeted alkanes reached 77.0% with an aqueous and organic solvent ratio of 1:2. The catalytic performance of Ni/Mg-Al-O/AC dropped substantially after 5th reuses, caused by Ni sites coverage due to the formation of boehmite via the hydration of Ni/Mg-Al-O/AC with water. Zr ions replaced Al ions in the bifunctional catalyst, then the yield of the final product achieved 75.6% with Ni/Mg-Zr-O/AC, and it was still maintained at 67.9% after 5th reuses. In this study, the one-pot combination of C-C coupling and hydrogenation was achieved by designing the catalyst and solvent system, promoting biomass-derived jet fuel development more sustainably and simply.
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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绿色化学
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产品关联
DOI
高影响因子
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