JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Naichuan Yu,Xianhong Zeng,Xingning Ma,Yu Sun,Yixuan Wang,Bingbing Chen,Zhaoqi Luo,Chaofang Dong,Kun Shen,Junsheng Wu
Treating real electroplating wastewater is challenging due to the coexistence of organic contaminants and heavy metal ions, which collectively increase toxicity and pose serious risks to human and environmental health. In this study, the simultaneous removal of a typical organic pollutant (benzodiacetone) and a heavy metal ion (Cr(VI)) from electroplating effluent was investigated using a heterogeneous electro-Fenton process catalyzed by a novel Ce-Fe 2 O 3 /Al 2 O 3 material. Comprehensive characterization and theoretical calculations confirmed the excellent catalytic performance of the synthesized catalyst. Under near-neutral conditions, the electro-Fenton system achieved removal efficiencies of 99.1 % for benzodiacetone and 98.8 % for Cr(VI). The mechanism of simultaneous degradation was explored, revealing that Ce doping enhanced Fe redox cycling by lowering the binding energy between H 2 O 2 and Fe and facilitating electron transfer from Fe (III) to Fe (II). Additionally, Ce doping improved the stability and reusability of the catalyst. And the Ce could also extend the lifetime and reusability of the catalyst. This work developed a highly efficient heterogeneous catalyst in the electro-Fenton process and demonstrated that the Ce-Fe 2 O 3 /Al 2 O 3 catalyst had a superior application potential in synergic removal of Cr(VI) and benzodiacetone area.
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Russian Journal of Physical Chemistry A
·
2022
·Vol. 96
·期 9
·1944-1950
·
IF 0.791
Zhang Yuanyang,Bao Kun,Wang Xuchao,Wang Linqi
Abstract A series of Ru and Ru–Pd supported samples on deep desulfurization, especially thiophene-like compounds, were prepared by wet impregnation method. It indicated that the suitable Ru content on the support could be 1.5 wt % (Ru(1.5)/Al 2 O 3 ) under used experimental conditions. The effects of Pd on Ru(1.5)/Al 2 O 3 sample showed that the suitable content of Pd was probably 0.3 wt % (Ru(1.5)–Pd(0.3)/Al 2 O 3 ), and its breakthrough sulfur capacity could be reached to 1.244 g S /kg Cat . XPS and SEM characterization over fresh and used samples of Ru(1.5)–Pd(0.3)/Al 2 O 3 indicated that it had good stable structure. Furthermore, it indicated that the adsorption isotherm model of Freundlich equation was well fitted the experimental data ( R 2 = 0.989) and the parameters of Freundlich equation were obtained by linear regression.
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CHEMOSPHERE
·
2018
·
IF 4.427
Zhuangpeng Huang,Zhiping Chen,Yuancai Chen,Yongyou Hu
Iron-copper bimetal supported on mesoporous γ-Al 2 O 3 with different Fe/Cu ratios was prepared via a modified evaporation-induced self-assembly method and employed to degrade 4-chlorophenol (4-CP) in a Fenton-like process. The X-ray photoelectron spectroscopy, X-ray diffraction spectrum and UV–vis diffuse reflectance spectroscopy results confirmed the co-doping of Fe 2+ /Fe 3+ and Cu + /Cu 2+ into the lattice of γ-Al 2 O 3 through the bonds of Al O Fe and Al O Cu. With the iron and copper co-doped in γ-Al 2 O 3 , three-fold oxygen vacancies (V 0 ) could be achieved compared with that of non-metal catalysts, which was favorable for the reduction of iron and copper species. The 1Fe3Cu-γ-Al 2 O 3 with a Fe/Cu mass ratio of 1:3 exhibited the highest activity on Fenton-like degradation of 4-CP due to the synergistic effects of Fe and Cu by facilitating the electron transfer in the recycles of Cu + /Cu 2+ and Fe 2+ /Fe 3+ based on the results of X-ray photoelectron spectroscopy, cyclic voltammetry and electro paramagnetic resonance analysis. The utilization efficiency of H 2 O 2 was as high as 86.0% when 4-CP almost disappeared (i.e., 99.7 percent of 0.78 mM 4-CP) at 240 min and pH 7.0, additionally, their dechlorination and TOC removal efficiencies were 92.0% and 81.6%, respectively. The catalyst also displayed a good performance after 5th cycles. Furthermore, a possible mechanism for activation of OH on the catalyst surface was also proposed.
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Catalysts
·
2018
·Vol. 8
·期 12
·642
·
IF 3.465
Yan Gao,Tao Luan,Mingyang Zhang,Wenke Zhang,Wenchen Feng
A series of Mn−Fe−Ce−Ox/γ-Al2O3nanocatalysts were synthesized with different Mn/Fe ratios for the catalytic oxidation of NO into NO2and the catalytic elimination of NOxvia fast selective catalytic reduction (SCR) reaction. The effects of Mn/Fe ratio on the physicochemical properties of the samples were analyzed by means of various techniques including N2adsorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), H2-temperature-programmed reduction (TPR), NH3-temperature-programmed desorption (TPD) and NO-TPD, meanwhile, their catalytic performance was also evaluated and compared. Multiple characterizations revealed that the catalytic performance was highly dependent on the phase composition. The Mn15Fe15−Ce/Al sample with the Mn/Fe molar ratio of 1.0 presented the optimal structure characteristic among all tested samples, with the largest surface area, increased active components distributions, the reduced crystallinity and diminished particle sizes. In the meantime, the ratios of Mn4+/Mnn+, Fe2+/Fen+and Ce3+/Cen+in Mn15Fe15−Ce/Al samples were improved, which could enhance the redox capacity and increase the quantity of chemisorbed oxygen and oxygen vacancy, thus facilitating NO oxidation into NO2and eventually promoting the fast SCR reaction. In accord with the structure results, the Mn15Fe15−Ce/Al sample exhibited the highest NO oxidation rate of 64.2% at 350 °C and the broadest temperature window of 75–350 °C with the NOxconversion >90%. Based on the structure–activity relationship discussion, the catalytic mechanism over the Mn−Fe−Ce ternary components supported byγ-Al2O3were proposed. Overall, it was believed that the optimization of Mn/Fe ratio in Mn−Fe−Ce/Al nanocatalyst was an extremely effective method to improve the structure–activity relationships for NO pre-oxidation and the fast SCR reaction.
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FUEL
·
2024
·
IF 6.7
Xu Ma,Wei-Wei Yang,Jia-Rui Zhang,Xin-Yuan Tang
This research delves into the methane dry reforming, meticulously exploring the structural-evolution of Ni-Ce bimetallic alloy on Al 2 O 3 support during the reaction-process and its impact on catalytic performance. By delicately tuning the cerium content to an optimal proportion of 10 wt%, we achieved a remarkable optimization of the catalyst structure, fostering the low-temperature reduction of nickel-species and an increase in oxygen-vacancies. At 800 °C, this optimized catalyst exhibited a methane conversion as high as 98.34 % (maintained for 50 h), significantly outperforming the Ni@Al 2 O 3 . Our findings revealed that the synergistic-interaction between the Ni-Ce bimetallic properties and the hydrogen-reduction-process enhanced the crystallinity and accessibility of active-sites within the catalytic. In-situ DRIFT spectroscopy and thermogravimetric analysis demonstrated that the adoption of a cerium modulation strategy markedly enhances the adsorption and dissociation efficiency of reactants, while effectively mitigating the formation of carbon deposition during extended reaction periods. Consequently, this ensures that the catalyst maintains exceptional activity throughout a continuous 50-hours operation. This study expands the new adsorption and carbon-accumulation mechanism in the methane dry reforming and lays a solid-foundation for its industrial application.
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Journal of Water Process Engineering
·
2024
·
IF 6.3
Pengfei Li,Yongjun Liu,Zhuangzhuang Yang,Lu Yang,Pan Liu,Zhe Liu,Xiaowei Li
The complete harmless treatment of aromatic organic compounds in coal chemical wastewater (CCW) has always been a big challenge in water process engineering. This study addresses the issue by designing and preparing a kind of Ce and Al bimetallic catalyst with high oxygen vacancies (OVs) based on SiC carrier. The results showed that CeO 2 and Al 2 O 3 were uniformly dispersed on SiC, and the composite material exhibited an ordered cubic structure. The degradation efficiency and enhancement mechanism of the catalyst with ozone oxidation were investigated. When applied to actual CCW with a chemical oxygen demand (COD) concentration exceeding 600 mg/L, the synergy between O 3 and CeO 2 /Al 2 O 3 -SiC increased the degradation efficiency of phenols from 50 % to 99 % and COD from 42 % to 78 % compared to using O 3 alone. CeO 2 /Al 2 O 3 -SiC had a high concentration of oxygen vacancies (OVs = 48.57 %). Further research indicated that oxygen vacancies (OVs) were the main active sites for ozone adsorption and reactive oxygen species (ROSs) generation. Electron paramagnetic resonance (EPR) and quenching experiments also confirmed that O 3 , •O 2 −1 , 1 O 2 were the main active oxidation factors, rather than •OH. Additionally, even after granulating the catalyst, it still achieved 99 % degradation of phenols. Therefore, this study provides theoretical support for the complete harmless treatment of CCW and has broad prospects for industrial application.
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Jingjing Liu,Jinlong Yang,Jiyuan Zhang,Haiyang Chen,Shaojun Kang
Porous materials with wrinkled surfaces could have broad applications in catalysis and adsorption. However, designing cellular ceramics with similar structures is challenging. Herein, we demonstrated the binary colloidal self-assembly of γ-Al 2 O 3 nanoparticle/silica gelation network for constructing such materials. The competitive effect between volume shrinkage and surface bend during water evaporation of silica gel contributed to wrinkled aperture surface. During calcination , silica nanoparticles were highly active to react with alumina to form mullite nanocrystals , bringing about high compressive strength at low relative densities. After calcining at 1350 °C, resultant products with hierarchical structure exhibited an outstanding compressive strength of 4.2 MPa, a relatively high surface area of 7.23 m 2 /g at a porosity level of 83.3%. The current strategy provides a feasible and affordable approach for producing high performance ceramic foams towards practical application fields in catalysis and adsorption.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2026
·
IF 3.5
Zhen Xu,Caiyun Wang,Jiling Guo,Tianyu Bai,Yunmei Zhang,Han Yang,Fan Shao,Fengzhi Guo,Wenbin Huang,Qiang Wei
Cerium modification modulates the surface acidity and metal-support interactions of the Ni/γ-Al 2 O 3 catalyst. • Cerium species can not only suppress the formation of strong acid sites, but also regulate the adsorption configuration of pyridine molecules. • The enhanced electron transfer from cerium to nickel improves the reducibility and hydrogen activation performance of nickel. • The Ni/Al–Ce(10) catalyst achieves high catalytic activity in the pyridine hydrogenation reaction. To address the key challenge of achieving both high conversion and high selectivity in the selective hydrogenation of pyridine, this paper proposes a strategy of precisely modulating the surface acidity and metal–support interaction of an alumina support via cerium (Ce) modification. The study shows that Ce modification effectively suppresses the strong acid sites on the alumina surface, thereby promoting the desorption of the target product, piperidine. Meanwhile, Ce doping induces a flat-lying adsorption configuration of pyridine molecules, which is more favorable for the saturation hydrogenation of the aromatic ring, significantly enhancing the hydrogenation selectivity. Ce species facilitate electron transfer to the nickel active centers, increasing the local electron density around the nickel sites. This reduces the binding energy of nickel, enhances its reducibility, and effectively inhibits the formation of nickel aluminate spinel (NiAl 2 O 4 ), thereby improving the intrinsic hydrogenation activity of the catalyst. Under the reaction condition of 200 °C, the Ni/Al–Ce (10) catalyst achieves a pyridine conversion of 99.5% and a piperidine selectivity of 97.4%. Download: Download high-res image (281KB) Download: Download full-size image
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Minglei Lu,Shuting Liu,Haiping Zhu,Haifeng Huang,Chunying Lin,Jianxian Li,Baofang Zhang,Zefeng Zheng,Changsong Hu,Xiaoping Wu,Geli Liu,Tiejun Wang
Highly efficient releasing of hydrogen by aqueous-phase reforming of methanol (APRM) is of great significance to promote the development of stationary and mobile H 2 power supply for polymer electrolyte membrane fuel cells (PEMFCs). However, highly active catalysts with excellent performance of in situ releasing H 2 from APRM still face challenges. Herein, we report a Cu-SP/Al 2 O 3 –ZnO (Cu-SP/AZ) catalyst prepared by carbon layer encapsulated hierarchical porous microsphere strategy, which enhanced Cu dispersion (52.8 wt% loading, ∼5 nm particle size) on Al 2 O 3 –ZnO (AZ) microsphere . The proposed catalyst exhibited high H 2 production rate (base-free) of 64.23 μmolH 2 /gcat/s at 210 °C, which was nearly the same as that of 20% Pt/C catalyst (63.86 μmolH 2 /gcat/s) and 2.6-fold higher than that of commercial CuO/ZnO/Al 2 O 3 catalyst (24.62 μmolH 2 /gcat/s). The characterization results demonstrated that its high activity in APRM could be ascribed to the strategy of carbon layer encapsulated hierarchical porous microsphere as well as coordination of hydroxyl functional group of SP with Cu 2+ .
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Membranes
·
2023
·Vol. 13
·期 5
·536
·
IF 4.2
Chunxiao Ding,Hong Qi
Pristine graphene oxide (GO)-based membranes have proven promising for molecular and ion separation owing to efficient molecular transport nanochannels, but their separation ability in an aqueous environment is limited by the natural swelling tendency of GO. To obtain a novel membrane with anti-swelling behavior and remarkable desalination capability, we used the Al2O3tubular membrane with an average pore size of 20 nm as the substrate and fabricated several GO nanofiltration ceramic membranes with different interlayer structures and surface charges by fine-tuning the pH of the GO-EDA membrane-forming suspension (pH = 7, 9, 11). The resultant membranes could maintain desalination stability, whether immersed in water for 680 h or operated under a high-pressure environment. When the pH of the membrane-forming suspension was 11, the prepared GE-11 membrane showed a rejection of 91.5% (measured at 5 bar) towards 1 mM Na2SO4after soaking in water for 680 h. An increase in the transmembrane pressure to 20 bar resulted in an increase in the rejection towards the 1 mM Na2SO4solution to 96.3%, and an increase in the permeance to 3.7 L·m−2·h−1·bar−1. The proposed strategy in varying charge repulsion is beneficial to the future development of GO-derived nanofiltration ceramic membranes.
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PubMed
高影响因子
Materials Today Communications
·
2022
·
IF 3.662
Yuge Ouyang,Zongxian Yang,Tianyang Long,Huafeng Tian,Liuyang Bai,Xiaofei Li,Fangli Yuan
With the increasing demand for thermal management materials in the highly integrated electronics fields, it is great significant to develop next-generation thermal conductive yet electrically insulating composites to efficiently solve “hot spot” problems. Herein, based on sintering mass transfer of particles, branched Al 2 O 3 (B-Al 2 O 3 ) are prepared by calcinating spherical Al 2 O 3 , and then are introduced into silicon rubber (SiR) matrix with CNTs to fabricate SiR composites. The B-Al 2 O 3 fillers are overlapped with each other through branched structures, while CNTs with a high aspect ratio contribute to construct a more continuous thermal conductive network effectively by bridging B-Al 2 O 3 in the composites. The SiR composite exhibits a higher thermal conductivity of 1.307 W·m −1 ·K −1 with 20 vol% B-Al 2 O 3 and 0.5 wt% CNTs, which is also higher than that of SiR incorporated with 37 vol% B-Al 2 O 3 . Meanwhile, the electrically insulation of the SiR composites is not damaged due to the addition of a small amount of CNTs, which shows high volume resistivity of 10 15 Ω·cm. Furthermore, the SiR composites possess elevated flexibility, tensile strength , Young’s modulus and fracture toughness. Our findings provide a practical route to produce polymer composites with high thermal conductivity and excellent electrically insulation performance for thermal management applications in advanced electronic devices.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xiaoyang Wang,Jianguo Huang,Hao Feng,Jinfeng Li,Zidie Pu,Xiangchun Yin
The hierarchical architecture constitutes one of the key factors affecting the performance of microwave absorbing materials (MAMs). Herein, core-shell Fe 3 O 4 with a dendritic hierarchical structure is fabricated successfully by the melting method in a SiO 2 -B 2 O 3 -Al 2 O 3 -CaO-Fe 2 O 3 multi-component system. The multiple transmission scattering absorption mechanism is mediated by the unique microstructure, thus improving the impedance matching and the microwave loss ability of the material. According to its reflection loss curve, the microwave absorption was efficiently optimized, yielding a minimum reflection loss (R L ) of − 54.26 dB when the thickness was 3.47 mm, and the effective bandwidth (R L <10 dB) for electromagnetic wave reflectance reached 3.28 GHz (6.48–9.76 GHz) with a sample thickness of 1.8 mm. The present work adds new useful information for the designing of high-performance glass-ceramic MAMs.
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