CATALYSIS LETTERS
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2025
·Vol. 155
·期 5
·1-14
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IF 2.4
Wang Juping,Zhu Fengfan,Qin Yu,Zhu Yuan-Hao,Zhou Jiancheng,Li Naixu
This research is centered on the design and synthesis of a highly efficient heterogeneous catalyst, 1%Ru-MgO- 400 °C, for the hydrogenation of pyrrole to pyrrolidine. As a key intermediate in pharmaceutical manufacturing and fine chemical production, pyrrolidine synthesis poses significant challenges in terms of efficiency. In this work, MgO was synthesized via the calcination of Mg(OH) 2 , followed by the deposition of Ru onto MgO- 400 °C through a sodium borohydride reduction approach to produce the 1%Ru-MgO- 400 °C catalyst. The catalyst demonstrated exceptional performance under conditions of 170 °C and 3.5 MPa H 2 pressure, achieving complete conversion of pyrrole and a 100% yield of pyrrolidine. Advanced characterization methods such as XRD, TG, BET, SEM and HR-TEM were used to analyze the catalyst, revealing that the ruthenium nanoparticles were uniformly loaded on the MgO carrier to form a highly dispersed active site, while the crystal structure of MgO remained intact with excellent thermal stability, providing a structural basis for the efficient performance of the catalyst. Additionally, the catalyst exhibited remarkable stability and retained high activity over multiple reaction cycles, highlighting its suitability for industrial-scale applications. The findings of this study contribute novel perspectives to the development of robust and efficient hydrogenation catalysts and present a sustainable approach for the environmentally friendly synthesis of pyrrolidine. Graphic
研究领域:
催化化学
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材料科学
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制药工程
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Qiangqiang Xue,Zhengwen Li,Zhao Jiang,Meng Chen,Yujun Wang,Binhang Yan,Guangsheng Luo
Steam reforming (SR) is a process for converting transportation fuels into hydrogen-rich gas, which can be fed to SOFCs for on-board power supplies. Herein, we prepare Mg x Ni 1-x O (0.5
研究领域:
能源化学
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催化材料科学
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DOI
高影响因子
ENERGY
·
2015
·
IF 4.844
Zhihao Pan,C.Y. Zhao
Thermal energy storage systems improve the inefficiency of industrial processes and renewable energy systems (supply versus demand). Chemical reaction is a promising way to store thermal energy because of its high energy storage density , long-term energy storage, etc. This study investigated an MgO/H 2 O chemical thermal storage system that stores thermal energy by decomposing Mg(OH) 2 (endothermic reaction), and supplies thermal energy by combining water vapor with MgO (exothermic reaction). Heat supply is greatly influenced by MgO properties, particularly dehydration temperature. Therefore, the equilibrium hydration fractions of MgO prepared at various dehydration temperatures were measured. Then, the relation between dehydration temperature and the equilibrium hydration fractions of MgO was determined. The equilibrium hydration fractions of MgO at various hydration temperatures and pressures were also measured. The chemical thermal storage system was inefficient at dehydration temperatures lower than 350 °C or higher than 500 °C. The efficiency of this system can be improved by increasing the hydration temperature while keeping the relative vapor pressure unchanged.
研究领域:
能源科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2023
·Vol. 21
·期 2
·829-843
·
IF 2.1
Yang Yang,Jiaqi Yan,Shujia Cheng,Gang Liu,Bensong Chen,Kang Zheng,Lin Chen,Xingyou Tian
Cordierite ceramic is usually used for diesel particulate filter owing to its excellent low thermal expansion coefficient and high thermal shock resistance properties. However, the co-exited intermediate spinel phase can deteriorate the thermal and mechanical performances of cordierite ceramic product, because the spinel phase has much higher thermal expansion coefficient comparing to that of cordierite. In this study, two methods are utilized to reduce the spinel impurity in the cordierite ceramic. On the one hand, rational reaction resources were introduced to decrease spinel production. The formation of intermediate spinel phase is systematically researched by X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman characterizations and the results clarified the preference of path “Enstatite + Mullite → Cordierite” for less spinel production in comparison to path “Enstatite + Al 2 O 3 → Cordierite + Spinel.” Additionally, MgO was introduced as fluxing agent to promote liquid-phase sintering, thus facilitating the conversion of spinel. On the other hand, the sintering schedule was improved by introducing a holding temperature gradient to promote the diffusion of Si 4+ and further promote the conversion of spinel into cordierite. With these methods, the residual spinel phase is minimized, the resulting high-purity cordierite has a 47% reduction in the thermal expansion coefficient from 3.07 × 10 −6 /K to 1.63 × 10 −6 /K compared to the original cordierite sample.
研究领域:
材料科学
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陶瓷工程
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DOI
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Ping Cao,Yaohao Zhang,Yi Gao,Limei Zhang,Zhengyang Ji,Xinyue Cong
Organic–inorganic hybrid perovskite solar cells (PSCs) have attracted significant attention in recent years due to their exceptionally high theoretical photoelectric conversion efficiency. Although substantial breakthroughs have been made in controlling the bandgap by adjusting the ratio of organic–inorganic compounds, research on the electron transport layer (ETL) and hole transport layer has been largely overlooked, which greatly limits the further development of PSCs. In this study, a multilayer electron transport layer (ETL) was constructed based on ZnO nanofilms, utilizing MgO and SnO2 with similar lattice dimensions to create a multilayer nanofilm structure. This design achieved energy level alignment, reduced exciton migration energy, and suppressed nonradiative recombination. Compared to the ZnO-SnO2 bilayer ETL, the ZnO-MgO-SnO2 multilayer ETL demonstrated a 142% improvement in photoelectric conversion efficiency. Finite element analysis from a microscopic perspective revealed the influence of MgO on carrier concentration. Additionally, first-principles calculations elucidated the transition of MgO from an insulator to a wide-bandgap semiconductor as it transformed from bulk crystal to nanofilm. The ZnO-MgO-SnO2 multilayer model explained the changes in the energy band structure of the multilayer ETL, providing a theoretical foundation for continuously enhancing the photoelectric conversion efficiency of PSCs.
研究领域:
材料科学
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能源技术
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物理化学
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DOI
高影响因子
ACS Catalysis
·
2024
·
IF 11.3
Mei-Yao Wu,Shan-Qing Li,Wei-Wei Wang,Chun-Jiang Jia
The structures of active components in practical solid catalysts are seldom homogeneous, which makes it challenging to explore the synergistic effect among the complex catalyst components in heterogeneous catalysis. The active structure of Cu-based catalysts, which are widely used in water gas shift reactions and other important industrial reactions, has been debated. This work prepared Cu–MgO catalysts with the copresence of Cu particles and Cu atoms to investigate the synergistic effects of these Cu species. We found that the Cu nanoparticles served to adsorb and activate the reactant molecule of CO, while the atomic Cu species at the surface of the MgO lattice might exist as the Mg2Cu2–Ov site for water dissociation. The presence of surface-substituted Cu atoms modulated the reactivity of adjacent oxygen vacancy in the MgO surface, enhanced the ability of H2O dissociation to form reactive –OH species, and allowed the oxygen vacancies to recycle, contributing to the continuation of the reaction. A volcano-type relation of catalytic performance versus Cu0/Cu2+ ratio has been established, revealing the existence of synergy between Cu particles and Cu atoms. In addition, due to this synergistic effect, the optimized Cu–MgO catalyst shows a very high activity with a CO conversion rate of 1119 μmolCO gCu–1 s–1 at 300 °C. This work revealed the synergistic effect of different Cu species in the Cu–MgO catalysts, which was important for unraveling the contribution of complex components to catalytic performance.
研究领域:
催化化学
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材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Yong Liu,Le Zhang,Ting Liu,Jianlong Wang
The selective oxidation of ammonium nitrogen (NH 4 + -N) to dinitrogen (N 2 ) by advanced oxidation processes (AOPs) is of paramount significance, but it is still a great challenge. In this study, a novel composite (FeO x -MgO) was synthesized to activate persulfate (PS) for selective oxidation of ammonium (NH 4 + ) to N 2 under simulated solar-light irradiation ( hv ). The results demonstrated that the conversion of NH 4 + to ammonia (NH 3 ) on the basic sites of FeO x -MgO was a key step for the selective oxidation of NH 4 + . Fe(IV) species formed in FeO x -MgO/PS/ hv system could enhance both the efficiency and N 2 selectivity of the NH 4 + -N oxidation through the oxidation of ammonia hydride to N 2 . The 100 % NH 4 + -N removal and over 95.5 % N 2 selectivity could be achieved after 30 min when initial pH was in range of 2–10, and the initial NH 4 + -N concentration was 30 mg N/L. This study could provide a promising technology for the selective oxidation of NH 4 + -N to N 2 in water and wastewater.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Zijian Liao,Mingliang Ma,Yuxin Bi,Zhouyu Tong,Kwok L. Chung,Zijian Li,Yong Ma,Binglong Gao,Zhengkai Cao,Ranran Sun,Xiang Zhong
Advanced microwave absorption (MA) materials have attracted widespread attention to meet the challenges of electromagnetic (EM) pollution. Herein, MgFe 2 O 4 /MgO/C fibers were successfully prepared via electrospinning technology and carbonization , and their surfaces were coated by MoS 2 via hydrothermal method . The EM wave absorption performance of composites was enhanced due to the introduction of MoS 2 . The results showed that the EM wave absorption performance of MgFe 2 O 4 /MgO/C could not meet the requirements due to low dielectric loss and poor impedance matching. The performance of the composites was improved after coating of MoS 2 , which showed the strong wave absorption capability and the broad absorption bandwidth. The optimal reflection loss (RL) is −56.94 dB at 9.5 GHz and the effective absorption bandwidth is 3.9 GHz (8.08–11.98 GHz) with a thickness of 2.7 mm. The excellent MA performance can be mainly attributed to excellent synergistic effect between MgFe 2 O 4 /MgO/C and MoS 2 . Furthermore, MoS 2 also contributes to dielectric loss and ideal impedance matching. MgFe 2 O 4 /MgO/C@MoS 2 composites may be utilized for lightweight and high-efficient MA materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Zhixian Bao,Dekang Li,Zhiheng Wang,Yuxin Wen,Lijun Jin,Haoquan Hu
The lack of detailed functions of different REMs in NH 3 decomposition to H 2 makes the efficient modified catalysts not rationally be designed though many REMs-modified catalysts have been reported. In this work, the 10Ni/A 1 Mg 4 O α (A = La, Ce, and Y) and 10Ni/MgO, in which supports were synthesized by the sol–gel method and Ni was loaded by the wet-impregnate method, were comparatively investigated to reveal the effect of REMs against NH 3 decomposition reaction. The presence of REMs enhanced the activity of 10Ni/A 1 Mg 4 O α and decreased the activation energy as greatly as by half compared to 10Ni/MgO. The produced H 2 in situ has little impact on the activity of 10Ni/A 1 Mg 4 O α , among which Ce has the most excellent H 2 desorption ability. The intrinsic activity of catalysts was improved better by Ce and Y than La and the best Ni particle size is around 6 nm according to TOF, though the Ni particle is the smallest (4.9 nm) in 10Ni/La 1 Mg 4 O α . The surface structure of catalysts was tuned by doping REMs, forming a solid solution and some defects (oxygen vacancies), which enhanced the interaction between active metal and support with obvious electron transfer from support to Ni obtaining a better Ni dispersion and making NiO easier to be reduced. Additionally, the catalysts doped by La or Ce possess more oxygen vacancy due to the changes of La 2 O 2 CO 3 and the valence of Ce, exhibiting stronger basic sites and better N 2 desorption capacity. The study offers a promising strategy for utilizing appropriate or multiple REMs to synthesize effective catalysts effectively for catalyzing NH 3 decomposition in the future.
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
COMPOSITES COMMUNICATIONS
·
2022
·
IF 7.685
Rongxia Zhao,Zhanyong Zhao,Peikang Bai,Wenbo Du,Di Tie,Zhen Zhang,Liqing Wang,Yu Wang
Magnesium-coated graphene (GNPs) was successfully prepared by a novel organic chemical reduction method with significantly improved wettability and dispersion. The GNPs were uniformly distributed in the matrix, while a finer and more dispersed strengthening phase β-Mg 17 Al 12 was precipitated around it. Moreover, MgO nanoparticles were formed by in-situ reaction on the surface of GNPs, forming nano-scale contact and tight interfacial bonding with the substrate, thereby significantly improving the wear resistance of the composites. The wear mechanism has also changed from severe delamination and abrasive wear to mixed wear of slight delamination , adhesion, and oxidation . The increase in wear resistance is attributed to the combined effect of the lubrication and load transfer of GNPs, the enhanced effect of fine precipitates on the mechanical properties of the matrix, and the synergistic effect of in situ generated MgO nanoparticles against deformation.
研究领域:
材料科学
·
表面工程
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DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 8
·4032-4038
·
IF 2.936
Yuting Xia,Jiayun Chen,Zhicai Zhu,Qilong Zhang,Hui Yang,Qianqian Wang
In this article, we provide a feasible method to prepare high-dielectric-constant hydrophobic composite films, which show potential application as the insulator layer in electrowetting devices. SiO2@MgO core–shell nanoparticles were fabricated via a hydrolysis process and embedded into the PMMA matrix. The microstructure of the nanoparticles and the cross-section of the films indicated that a SiO2 coating has successfully been prepared around the MgO particles with a thickness of about 20–30 nm and the nanofillers were homogeneously dispersed in the polymer. Hydrophobic films (contact angle ∼115°) with appropriate glass transition temperature were obtained. The dielectric constant at various frequencies of the functional fillers enhanced with increasing the SiO2@MgO filler content. The results suggested that SiO2@MgO is more effective in increasing the dielectric constant of PMMA when compared with MgO sheets. Typically, the dielectric constant of the PMMA composite filled with 40 wt% SiO2@MgO reaches 19.1 at 40 Hz, in contrast to 9.7 for the composite filled with 40 wt% MgO sheets and 3.8 for pristine PMMA. Also, the composites exhibited low electrical conductivity (≤10−7) even at high frequency. All the improved performances showed potential application in the dielectric layer of electrowetting devices.
研究领域:
材料科学
·
电气工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Kunlin Li,Xueyan Chen,Jianghao Zhang,Min Chen,Xiaoxiao Qin,Fei Wang,Kai Li,Jinhou Fang,Changbin Zhang
Regenerable materials with abundant basic sites and sulfur storage space are highly desirable for the removal of H 2 S. In this work, we synthesized a flower-like MgO/Carbon material by one-step carbonization of magnesium gluconate and applied it for H 2 S oxidation at room temperature. The results demonstrate that the high content of MgO and super-hydrophilic surface of the MgO/Carbon provide abundant basic sites for the adsorption and dissociation of H 2 S. Moreover, carbon defects and a well‐developed pore structure offer active sites for the desulfurization reaction and large space for storage of sulfur products. Consequently, the MgO/Carbon materials exhibit excellent H 2 S oxidation performance, which is far superior to that of commercial activated carbon. In addition, the MgO/Carbon materials show extraordinary regeneration capacity and maintain their high performance even after 5 cycles of desulfurization/regeneration. Furthermore, mechanisms for the H 2 S oxidation process, deactivation and regeneration are proposed based on the experimental and characterization results. Considering the simple preparation process, excellent desulfurization and regeneration performance of as-prepared MgO/Carbon material, our findings provide a new strategy for the design of efficient desulfurizers.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）