SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Xin Li,Xiangheng Niu,Peng Liu,Xuechao Xu,Dan Du,Yuehe Lin
Phosphate ion (Pi) is an inorganic anion widely distributed and commonly regarded as a significant indicator of water eutrophication, and thus it is urgent to develop convenient, cost-effective and reliable analytical approaches for the monitoring of Pi for water quality control. In this work, we propose the high-performance dual-channel ratiometric colorimetric sensing of Pi based on the analyte-triggered differential oxidase-mimicking activity changes of oxidized Ce-Zr bimetal-organic frameworks (oxidized UiO-66(Ce/Zr)). By integrating two types of metal nodes with different functions into one framework structure, the proposed oxidized UiO-66(Ce/Zr) not only exhibits excellent activity to catalyze the chromogenic oxidation of both 3,3′,5,5′-tetramethylbenzidine (TMB) and 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) due to oxidase-like active Ce 4+ /Ce 3+ sites but also provides main Zr 4+ sites to specifically recognize Pi. When Pi is in presence, it is rapidly adsorbed onto oxidized UiO-66(Ce/Zr) and changes the surface chemistry of the latter, leading to differential enzyme-like activity changes towards the two chromogenic substrates TMB and ABTS. Based on this finding, a dual-channel ratiometric colorimetric method was established for the sensitive determination of Pi. Compared to conventional single-signal colorimetric sensors, our method offered a widened linear detection scope from 3.3 to 666.7 μM. Also, robust and accurate analysis of Pi in various water matrices was demonstrated, indicating our method’s great potential in practical applications.
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Catalysis Science & Technology
·
2018
·Vol. 9
·期 2
·286-301
·
IF 5.365
Mengyuan Zhang,Shipeng Wu,Longchun Bian,Qiue Cao,Wenhao Fang
Ce–Ni mixed oxides with different Ni/Ce molar ratios, promoted by a rather low amount of Pd (0.2 wt%), were prepared by a simple one-pot precipitation method. The thus-synthesized CeNiXOY and Pd–CeNiXOY catalysts were applied respectively to the direct N-alkylation of amine and alcohol via oxidative coupling, under O2 in the absence of basic additives. The CeNiXOY catalyst could provide a >99% yield of imine in the model alkylation reaction of aniline with benzyl alcohol at 100 °C. The Pd-promoted Pd–CeNiXOY catalyst surprisingly showed an enhanced imine yield (>99%) at a mild temperature of 60 °C. This catalyst exhibited good reusability, and moreover, demonstrated high performance towards imine synthesis from various amines with alcohols. The presence of Pd species and the Ni/Ce molar ratio showed a synergistic impact on the conversion of aniline, as well as on the product selectivity, which was believed to be related to the improvement on the intrinsic activity of the oxidation of benzyl alcohol to benzaldehyde. Various physicochemical techniques, including ICP-MS, XRD, N2 adsorption–desorption, UV-Raman, H2-TPR, TEM, EPMA and XPS, were employed to study mainly the composition, structure and redox properties of the catalysts. The proportion of Ce3+ species and oxygen vacancies, which can be manipulated by the Ce–Ni redox system and the interaction between Ce and Ni, was crucial to the selective activation of alcohols in the presence of reactive amines. The activation of alcohol on the highly reactive Pd0 species was the other crucial factor.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Yinghui Sun,Guojie Zhang,Ying Xu,Riguang Zhang
The catalytic activity of DRM reaction over 1M-1Co-1Ce/AC-N (M = Ca and Mg) catalysts was investigated at 800 °C and under atmospheric pressure. By promoting N-doped activated carbon supported Co-Ce catalysts with alkaline-earth metals to obtain catalysts with better catalytic performance is the main purpose of study. The catalysts were prepared by wet-impregnation method and the influence of impregnation sequence on catalytic performance was also studied. The characterization was conducted using TPR, TPD , XPS, TEM and Raman. The catalyst 1Ca-1Co-1Ce/AC-N promoted with Ca and prepared by co-impregnation exhibited higher catalytic activity than unmodified. This was mainly due to the stronger interaction between metal and support as well as better active metals dispersion. The 1Ca-1Co-1Ce/AC-N catalysts also displayed excellent stability and XPS results indicated that higher Ce 3+ /Ce 4+ and O β /(O α +O β ) ratios were observed on this catalyst. However, the catalyst 1Co-1Ce/1Ca/AC-N prepared with sequential impregnation exhibited poor stability. In addition, the TEM of the spent catalysts revealed that there were a large number of carbons were generated on active metal surface.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Zirui Ma,Rongyao Qiu,Yiran Luo,Tong Liu,Haonan Chen,Mengwen Fan,Yi Wan,Lin Lv,Zhishan Li,Houzhao Wan,Hao Wang
Developing non-precious-metal electrocatalysts with concurrent high activity and durability remains a grand challenge for the alkaline oxygen evolution reaction (OER). Herein, we rationally design and develop a cerium and boron co-doped ultrathin copper–cobalt carbonate hydroxide nanosheet (B-Ce-CuCo) electrocatalyst. The introduced Ce and B achieve a rare collaboration between the adsorbate evolution mechanism (AEM) and lattice oxygen oxidation mechanism (LOM) by optimizing oxygen-containing intermediate adsorption, increasing stabilized oxygen vacancies, and activating lattice oxygen. The optimized catalyst exhibits an ultralow overpotential of 208 mV at 10 mA cm −2 with a Tafel slope of 42.77 mV dec −1 and exceptional stability over 1000 h at 50 mA cm −2 . Theoretical calculations reveal that Ce modulates the electronic structure by shifting unoccupied Co/O states toward the Fermi level, optimizing the adsoprtion of oxygenated intermediate and boosting the AEM pathway. Both Ce and B promote oxygen vacancy generation, while B stabilizes these vacancies to activate lattice oxygen, enabling extensive LOM participation via Co(IV) O and *O O intermediates. 18 O-labeled differential electrochemical mass spectrometry (DEMS) directly identifies the coexistence of AEM and LOM pathways. This synergy reduces the AEM and LOM energy barriers to 0.39 eV and 0.58 eV, respectively, establishing a fundamentally new paradigm for designing high-performance electrocatalysts via dual-element doping. Download: Download high-res image (154KB) Download: Download full-size image
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高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2026
·
IF 5.2
Zilong Liang,Zhiwei Luo,Ping Zhang,Qian Zhao,Yuchun Zhang
Carbon monoxide (CO) can rapidly accumulate in confined environments such as tunnel fires, posing an acute poisoning risk and demanding catalysts with low-temperature light-off and fast purification capability. Here, we construct a porous mixed-oxide framework from a Ce–Co metal–organic framework precursor and subsequently load 7 wt% CuO, yielding CuO@Co x Ce 1−x –O composite catalysts. Tricobalt tetraoxide (Co 3 O 4 ), Cerium dioxide (CeO 2 ) and Copper (II) oxide (CuO) are deliberately selected to couple reversible oxygen storage/defect regulation (Ce 4+ /Ce 3+ ), low-temperature redox cycling (Co 3+ /Co 2+ ), and interfacial charge-transfer sites for CO activation (CuO). Meanwhile, the MOF-derived strategy enables homogeneous component dispersion, abundant porosity, and intimate heterointerfaces, thereby maximizing interfacial synergy. Among the series, CuO@ Co 8 Ce 2 –O (Co:Ce = 8:2) exhibits the best performance, decreasing the temperature required for 90% CO conversion by 216 °C relative to the undoped counterpart and maintaining stable activity during prolonged operation. Correlating micromorphology, surface physicochemical properties, and redox/oxygen-mobility behavior reveals that moderate Ce incorporation increases defect-associated reactive oxygen species and accelerates oxygen transport, while strengthened Ce–Co electronic coupling further promotes interfacial synergy at the CuO–oxide junctions. Mechanistic evidence supports a Mars–van Krevelen pathway with dynamically regenerated interfacial oxygen vacancies, enabling rapid CO oxidation. This work provides a rational interface-engineering strategy for efficient CO purification in confined fire-related scenarios.
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高影响因子
Materials
·
2022
·Vol. 15
·期 12
·4149
·
IF 3.748
Yinghui Wang,Xiurong Guo,Danfeng Du,Shaochi Yang
Perovskite-type catalysts were widely used in the field of automobile exhaust purification due to their inherent physicochemical properties and excellent doping characteristics. A series of La1−xMxCo1−yNyO3(M = Ce, Ca; N = Fe, Mn) perovskite-type catalyst samples were prepared by sol-gel method for the four-way purification of PM, NOx, CO, and HC emitted by diesel exhaust. The activity of catalyst samples was tested by simulation experiments and hydrogen temperature-programmed reduction (H2-TPR). Catalyst samples were characterized by means of XRD, FT-IR, SEM, BET, and XPS analysis. The results demonstrated that the perovskite-type catalyst samples with a particle pore size of 3–5 μm can be prepared by sol-gel method. When A-site of LaCoO3perovskite-type oxide was doped by cerium ions, the catalyst samples produced small distortion. The doping of cerium ions to A-site was more conducive to the four-way purification of diesel exhaust than calcium ions. La0.8Ce0.2CoO3perovskite-type samples showed the best purification efficiency, and the purification efficiencies of PM, NOx, CO, and HC were 90%, 85%, 94%, and 100%, respectively. When the B-site of La0.8Ce0.2CoO3perovskite was doped with iron ions, the purification efficiency of catalyst samples for PM and NOxcan be further enhanced. When the B-site of La0.8Ce0.2CoO3perovskite was doped with manganese ions, the purification efficiency of the catalyst samples for PM can be further enhanced. It can be seen from the simulation experiments that La0.8Ce0.2Co0.7Fe0.3O3perovskite was the best doping amount, and the purification efficiencies of PM, NOx, CO, and HC were 95%, 92%, 94%, and 100%, respectively.Keywords:perovskite-type catalyst;diesel exhaust;sol-gel method;four-way purification;doping amount
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高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 9
·2177
·
IF 5.076
Easar Alam,Qiyan Feng,Hong Yang,Jiaxi Fan,Sameena Mumtaz,Farida Begum
In this study, iron oxide (Fe3O4) was coated with ZrO2, and doped with three rare earth elements((Y/La/Ce), and a multi-staged rare earth doped zirconia adsorbent was prepared by using uniform design U14, Response Surface methodology, and orthogonal design, to remove As3+and As5+from the aqueous solution. Based on the results of TEM, EDS, XRD, FTIR, and N2-adsorption desorption test, the best molar ratio of Fe3O4:TMAOH:Zirconium butoxide:Y:La:Ce was selected as 1:12:11:1:0.02:0.08. The specific surface area and porosity was 263 m2/g, and 0.156 cm3/g, respectively. The isothermal curves and fitting equation parameters show that Langmuir model, and Redlich Peterson model fitted well. As per calculations of the Langmuir model, the highest adsorption capacities for As3+and As5+ions were recorded as 68.33 mg/g, 84.23 mg/g, respectively. The fitting curves and equations of the kinetic models favors the quasi second order kinetic model. Material regeneration was very effective, and even in the last cycle the regeneration capacities of both As3+and As5+were 75.15%, and 77.59%, respectively. Adsorption and regeneration results suggest that adsorbent has easy synthesis method, and reusable, so it can be used as a potential adsorbent for the removal of arsenic from aqueous solution.Keywords:magnetic Fe3O4;uniform design;surface response methodology;multi-staged doping;arsenic (III & V) removal
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Qiang Liu,Bingsi Liu,Qinze Liu,Qiuyue Zhang,Rongnian Xu,Xuanyue Wu,Hong Xia
Refined design of sustainable sorbent demands to tackle the strong dependence for additional mesoporous support and low utilization in hot coal gas desulfurization. Unlike the well-established preparation of loading sorbents supported on zeolites, a vacuum-assisted self-assemble strategy tapping into the ordered channels of walnut wood is proposed to facilely fabricate three-dimensional (3D) (a%Ce–Mn) y Al 2−y O x desulfurizers with anisotropy which provides a desirable macroporosity for rapid diffusion of H 2 S. Benefiting from the inherent straight channle in micron scale, the obtained (8%Ce–Mn) 1.5 Al 0.5 O x presents the highest breakthrough sulfur capacity (289.79 mg g −1 ) and effective utilization (88.42%) at 700 °C. The favorable rapid diffusion of gases in micro/macropores improves greatly the H 2 O-resistance and anti-interference ability of 3D (8%Ce–Mn) 1.5 Al 0.5 O x for high steam and concentration of reducing gas. The fast mass transport in sulfidation reaction at 700 °C is described perfectly by the improved deactivation kinetics model. This study opens a novel design of the ideal 3D desulfurizers with micron porosity inherited from hierarchical architecture of walnut wood for industrialization utilization in the near future.
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高影响因子
Materials
·
2023
·Vol. 16
·期 20
·6667
·
IF 3.4
Yukun Li,Svenja Hanson,Cheng Heng Pang,Peng Lyu,Jun Jiang
In order to attain phosphor ceramics with a high Color-Rendering Index (CRI), samples with the composition of Y0.997−xRexCe0.003)3(Al0.9748Mn2+0.024Cr3+0.0012)5O12(Rex= 0, Gd0.333, Gd0.666, Gd0.997, Tb0.333, Tb0.666, Tb0.997and Lu0.997were prepared by solid-state reaction and vacuum sintering, and exhibited potential for high-quality, solid-state lighting. Doping with Cr3+and Mn2+effectively enhanced the red component of Ce3+spectra through the intense energy transfer from Ce3+ions to Mn2+/Cr3+ions. The crystal field splitting of [GdO8] and [TbO8] was more extensive than that of [YO8], causing a massive redshift in the Ce3+emission peaks from 542 to 561 and 595 nm, while [LuO8] had an opposite effect and caused a blueshift with a peak position at 512 nm. White LED devices incorporating Ce/Mn/Cr: (Gd0.333Y0.664)3Al5O12phosphor ceramic exhibited a high CRI of 83.97, highlighting the potential for enhancing the red-light component of white LED lighting.Keywords:garnet phosphor;laser lighting;full spectrum;spectral modulation;Ce/Mn/Cr: (Re,Y)3Al5O12
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高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Zhenyu Chen,Teng Li,Lifen Liu
Treatment of chemical industrial wastewater often faces problems of large volume occupation, high cost, and long processing time. In this study, low-content Ce-modified g-C 3 N 4 was prepared and used as a catalyst on stainless steel mesh photo-cathode in constructing a multi-stage cascade microbial fuel cell system to reduce treatment costs in an energy-saving way. The large specific surface area (332.5 m 2 g −1 ) and mesoporous structure of the material, is favorable for catalytic reactions, in which Ce elements were mainly present in single atoms . The characterized catalyst indicated a pronounced effect of Ce species in increasing photo-current and the synergistic pollutant removal , microbial bio-degradation and cascade operation stability. In Batch-mode (light illumination, aeration, total HRT (hydraulic residence time) of 54 h) treatment through three cascade reactors, removed 88% COD (Chemical Oxygen Demand). With 0.5 mM PMS (peroxymonosulfate), 94% COD and 86% NH 4 + -N of the system were removed. The cascade net average COD removal capacity reached 16.04 kg per kg catalyst per day. The addition of PMS also enhanced the electricity generation. In continuous-mode, in totally 18 h treatment through the three-stages cascade reactors without PMS, overall, 83% COD and 78% TOC (Total Organic Carbon) were removed, reaching a net calculated system average COD removal capacity of 19.29 kg per kg catalyst per day. With Ce-g-C 3 N 4 catalyst, the batch or continuous multi-stage cascade system demonstrated great technical flexibility and economic potential in treating high-strength, high-salinity amine-rich industrial wastewater.
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高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Weiyuan Yao,Yue Liu,Zhongbiao Wu
A series of CeO 2 @Ce-O-P “multi-core@shell” catalysts were synthesized in this paper for selective catalytic reduction (SCR) of NO with NH 3 . The experimental results had showed that CeO 2 @Ce-O-P-30:3 yielded best SO 2 tolerance of an over 70% deNO x efficiency at 250 °C in the presence of 100 ppm SO 2 for 20 h, which was much higher compared to pure Ce-O-P and CeO 2 samples. Further characterization results indicated that Ce-O-P coating layer could somewhat inhibit sulfur depositing on the catalysts during SCR reaction in the presence of SO 2 , thereby protecting the active sites from SO 2 poisoning. Especially, O 2 -TPD results illustrated that a great amount of active oxygen species were retained on used CeO 2 @Ce-O-P catalyst after a long term reaction. The synergetic effect of “multi-core@shell” structure could be attributed to such enhanced performances. The “core” CeO 2 devoted abundant active oxygen sites to fulfill the SCR reaction. And the “shell” Ce-O-P could not only provide acid sites, but also protect the active oxygen species by avoiding the over-adsorption of SO 2 on the catalyst. This work could provide a new way to increase the sulfur resistance for low temperature SCR catalysts.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Qin Wu,Chi Fan,Ya Wang,Xiaoping Chen,Guimin Wang,Zhengxing Qin,Svetlana Mintova,Junhua Li,Jianjun Chen
The reduction of NO x emission during the cold start period of diesel vehicles requires special attention in accordance with the emission regulations. In this work, the direct incorporation of cerium and copper in SAPO-18 catalyst with AEI type framework structure (CuCe-SAPO-18) resulting in a substantial enhancement of the performance in the low-temperature NH 3 -SCR reaction (<200 ℃). A small amount of cerium (0.13–0.31 wt%) broadened the reaction temperature range of use and increased the hydrothermal stability of the catalyst considerably. The cerium species was introduced in the ion-exchange sites of Cu-SAPO-18 in the form of Ce 3+ ions even with high loading (3.15 wt%). The Ce 3+ ions were found to affect the distribution of silicon and aluminum atom coordination ( 29 Si NMR, 27 Al MAS NMR) in the AEI-type skeleton structure leading to an increase of both the amount of active Cu 2+ species and the acidity of the CuCe-SAPO-18 catalysts that are beneficial for the NH 3 -SCR reaction.
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