CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Fusheng Liu,Yaoyao Xiao,Xinxin Sun,Guohui Qin,Xiuyan Song,Yiyu Liu
Herein, CeO 2 -CaO nanoparticle coated on hollow ZrO 2 nanostructure (denoted as CeO 2 -CaO-ZrO 2 ) was prepared via a template impregnation method, which showed excellent catalytic performance for polycarbonate (PC) transesterification with methanol (named as methanolysis). The lattice oxygen (O 2− ) generated from the incorporation of CeO 2 and CaO to ZrO 2 , adsorbed atomic oxygen (O − ), or adsorbed molecular oxygen (O 2− ) generated from predominately via CeO 2 serve as the active species to promote PC methanolysis. In order to explore the detailed synergistic effect of different components and the influence of structure tailor, the mesoporous CaO-Al 2 O 3 was also investigated and compared with hollow CeO 2 -CaO-ZrO 2 . CeO 2 plays an important role in the storage and release of oxygen and forms stronger O 2− /O − /O 2 − basic sites. Notably, interfacial active species (electron-enriched O 2− /O − /O 2 − sites) participate in stripping protons from CH 3 OH which is the rate determination step for PC methanolysis. Such interfacial sites of CeO 2 -CaO-ZrO 2 catalyst serve as the optimal active site with the substantially declined activation energy barrier (∼0.31 eV) for stripping protons from CH 3 OH in contrast to that of 0.83 eV of CaO-Al 2 O 3 . The activation energy is considerably declined due to the interfacial synergistic component catalysis and abundant activation sites over hollow structure. The PC conversion over such hollow CeO 2 -CaO-ZrO 2 achieved almost 100% under the conditions of temperature 100 °C, m(cat):m(PC) = 0.05:1, n(methanol):n(PC) = 8:1 and time 2 h, while the conversion was only 13.4% over CaO-Al 2 O 3 under the same conditions. The hollow CeO 2 -CaO-ZrO 2 catalyst could be reused for 5 times without obvious decrease in PC conversion and BPA yield. This work supplies an extended understanding on interfacial synergistic catalysis toward PC methanolysis, which is important for efficient design and building of heterogeneous catalysts with higher activity.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Mei Luo,Xiangmin Fu,Shuo Geng,Ziwei Li,Min Li
CO 2 electrocatalysis reduction (CO 2 RR) is considered to be one of the most efficient methods to achieve carbon neutralization and realize renewable energy conversion. Unfortunately, at present, CO 2 electrocatalysts confront the challenges of high overpotential, low selectivity, and poor stability. Ag based electrocatalysts are considered to be the most promising catalysts for CO production via CO 2 RR on a large scale, due to their relatively higher catalytic performance and more abundant reserves compared with other noble metals. Whereas, they still suffer from high cost. In this paper, we design bimetallic CuAg/CeO 2 -6 catalysts by the simple impregnation method for CO 2 RR, exhibiting the highest FE CO of 84% at –1.1 V vs. RHE compared with other bimetallic catalysts with different Cu/Ag ratio and monometal catalysts. XPS results demonstrate the electron delocalization effect not only between Cu and Ag bimetals but also among CeO 2 support. This effect results in the electronic structure change and the formation of the highest concentration of oxygen vacancies, promoting the CO 2 adsorption and activation as well as facilitating the formation of COOH* intermediates as evidenced by the in situ ATR-SEIRAS measurements. Additionally, the highest active surface for CO 2 RR and the smallest charge resistance of CuAg/CeO 2 -6 also contributes to its good CO 2 RR performance. This work sheds light on the design of other efficient CO 2 RR catalysts through electronic structure tuning by bimetallic strategy.
研究领域:
电化学
·
催化
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材料科学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Shuyuan Hui,Qisen Ren,Jiawei Wang,Xiaohong Sun,Hongyao Liu,Xinqi Zhao,Yehong Liao,Mingzhou Chen,Xiansheng Zhang
CeO 2 ceramics, renowned for their high temperature resistance and other exceptional properties, have shown great potential in industrial applications. However, the practical applicability of CeO 2 is constrained by conventional forming processes, which often fail to meet the demands for intricate structural designs due to the requirement for costly molds. The direct ink writing (DIW) technique provides an economical option for the rapid production of CeO 2 ceramics with complex structures. Nevertheless, the presence of dispersants and binders in the DIW ink will affect the sintering process, leading to reduced mechanical performance in the final products. Herein, a strategy for preparing CeO 2 -based composite ceramics incorporating Al 2 O 3 additive to enhance comprehensive performance via the DIW technique is presented. The study investigated the rheological behavior of the ceramic inks and the effects of Al 2 O 3 addition on the mechanical properties of the samples. The findings demonstrated that the inclusion of 0.05 wt.% PVP and 0.9 wt.% PVA effectively prevented particle agglomeration and endowed the ink with outstanding printability. Ceramics containing 10 wt.% Al 2 O 3 (M82A10P59) achieved the highest relative density, resulting in superior mechanical properties, with flexural strength, fracture toughness, and Vickers hardness reaching 155 MPa, 4.60 MPa·m 1/2 , and 5.76 GPa, respectively. Notably, thermal conductivity values of M82A10P59 samples were 9.8021 W·m -1 ·K -1 , 6.9925 W·m -1 ·K -1 , and 6.2783 W·m -1 ·K -1 between 100 °C and 300 °C, surpassing those of pure CeO 2 . This work offers promising approaches to fabricating innovative and complex structures of high-performance CeO 2 ceramics for industrial applications.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Xiwen Xu,Ying Yang,Wenyuan Pei,Dan Li,Hui Yu,Xiangting Dong,Tianqi Wang
As a classical rare earth oxide, cerium dioxide (CeO 2 ) has played an important role in the realm of gas detection. Nonetheless, pure CeO 2 as a gas sensor material is challenged by a wide band gap, rapid carrier recombination, and high operating temperature, which affects its efficacy. Constructing heterogeneous composite materials is an effective method to remedy this issue. Herein, we introduced polyoxometalate (POMs, cluster formations of rare metal oxides.) electron acceptor into CeO 2 gas sensor for the first time to investigate the effect of POMs on gas sensitive properties. As a result, the CeO 2 /PW 12 gas sensor responds quickly and recovers promptly, showing a value of 8.41 to 100 ppm of toluene gas, which is much higher compared to pure CeO 2 sensor (3.05). And then CeO 2 /PW 12 sensor response recovery time of 6 s/71 s. Selectivity, repeatability, long-term stability and humidity resistance were also comprehensively explored. The results show that the sensor has the highest response value at 1 % PW 12 content. And the sensor showed good long-term stability and humidity resistance. The sensor has a minimum detection limit of 77.434 ppb for toluene. The improved sensing capabilities are a result of the incorporation of PW 12 . It serves as a shallow electron trap, capturing electrons within the conduction band of CeO 2 , thus the electron-hole pairs could be effectively separated. In that way the gas sensing performances of CeO 2 sensor were successfully improved. The research presented in this article outlines a novel approach to creating highly sensitive gas sensors utilizing CeO 2 , offering valuable insights into the utility of polyoxometalates in gas detection applications.
研究领域:
材料科学
·
传感器技术
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Shengnan Guan,Qifu Huang,Jianru Ma,Wenzhi Li,Ajibola T. Ogunbiyi,Zean Zhou,Kun Chen,Qi Zhang
The catalytic performance of MnO2(x)–CeO2 (x = Mn/Ce molar ratio) and the synergistic effect have been investigated in formaldehyde removal. The results showed that formaldehyde achieved 100% conversion at 60 °C for MnO2(1.5)–CeO2, with the gas hourly space velocity = 120 000 mL h–1 gcat–1. It was lower than the formaldehyde removal temperature of MnO2 (130 °C) and CeO2 (170 °C). The apparent activation energy for HCHO oxidation with MnO2(1.5)–CeO2 was 34.2 kJ mol–1. The partial mutual replacement of Mnx+ and Cex+ decreases the crystallite size due to the MnO2/CeO2 interaction. The X-ray photoelectron spectroscopy and the Raman analyses show that the Mn3+/Mn and Oads/Olatt ratios and the relative concentrations of oxygen vacancies for MnO2(1)–CeO2 and MnO2(1.5)–CeO2 were higher than those of the rest of the catalysts. Thus, the lattice oxygen (Olatt) from CeO2 readily transfers to the oxygen vacancy, achieving Olatt activation to surface-adsorbed oxygen (Oads).
研究领域:
催化化学
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环境科学
✓ 已验证
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Zhichao Yu,Xin Liu,Yang Liu,Yuan Li,Zhuohan Zhang,Kangli Chen,Shumin Han
Multiple catalysts have exhibited high activity on improving the hydrogen storage performance of MgH 2 . Herein, the hydrogen ab/desorption kinetics of MgH 2 is significantly improved by using Ni@C@CeO 2 as the catalyst. The results show that 10 wt%-Ni@C@CeO 2 doped MgH 2 can absorb 4.51 wt% hydrogen within 60 min under low temperature 75 °C. Furthermore, the MgH 2 -Ni@C@CeO 2 composites release approximately 4.88 wt% H 2 within 10 min at 325 °C. Moreover, the composites show excellent cycling performance, with negligible decrease in hydrogen storage capacity, hydrogen uptake rate and hydrogen release rate after ten cycles at 350 °C. The Rietveld refinement of X-ray diffraction and transmittance electron microscopy measurements reveal that Mg 2 NiH 4 /Mg 2 Ni and CeH 2.73 phases are in-situ formed. The mutual conversion of “Mg 2 Ni/Mg 2 NiH 4 ” during hydrogen ab/desorption is a well-known “hydrogen pump” effect, which improvs the hydrogen storage performance of MgH 2 . The presence of CeH 2.73 accelerate the conversion of Mg 2 Ni/Mg 2 NiH 4 , which we call ‘facilitated hydrogen pump’ effect. This attempt paves a potential way to achieve high performance Mg-based composites hydrogen storage materials via collaborative action between Ni and Ce species.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Yue Zhang,Cong Wu,Zhiqiang Wang,Jiawei Ji,Haiqin Wan,Weixin Zou,Qing Tong,Jingfang Sun,Lin Dong,Yu-Wen Chen
Herein, bimetallic Pt-Ir alloy nanoparticles (NPs) were successfully fabricated by ethylene glycol reduction of H 2 PtCl 6 ·6H 2 O and IrCl 3 through a microwave-assisted method. The Pt-Ir alloy NPs were deposited on CeO 2 catalysts for toluene combustion. The Pt 2.5 Ir/CeO 2 sample exhibited better catalytic activity at low reaction temperature, compared with monometallic catalysts. The excellent low-temperature catalytic activity was resulted from the interaction between Pt and Ir, richer adsorbed oxygen species and low-temperature reducibility. Furthermore, the in-situ DRIFTS was used to investigate the possible reaction pathway of Pt 2.5 Ir/CeO 2 . It showed that the broken of benzene ring on Pt 2.5 Ir/CeO 2 can be accomplished at lower temperature, resulting in enhancing the deep oxidation of toluene.
研究领域:
化学工程
·
催化科学
✓ 已验证
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2018
·Vol. 34
·期 4
·661-664
·
IF 1.248
Yi Ting,Li Jingwei,Zhang Yibo,Yang Xiangguang
Hollow-ZSM-5 was synthesized by a traditional hydrothermal method without alcohol, and a novel na-no-sized Ce-Cu/hollow ZSM-5 sample was prepared by conventional incipient wetness impreganation. The catalysts were characterized by TEM, SEM, XRD, NMR and N 2 adsorption-desorption. The results indicate that the hollow-ZSM-5 has a good MFI structure with large surface area. The synthesized CeO 2 -CuO/hollow ZSM-5 showed an excellent catalytic activity for NO x conversion(90% NO x conversion were obtained) in the temperature range of 340–550 °C under GHSV=480000 mL·g ‒1 ·h ‒1 due to its appropriate redox ability and acidity.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2022
·Vol. 27
·期 3
·679-694
·
IF 2.747
Tai Xiaoming,Liu Cansen,Chen Wanlin,Mai Yongjin,Zhang Liuyan,Wu Xinghua,Jie Xiaohua
Rubber tires, as an important part of automobiles, are produced by molding operation under molten temperature and high pressure. However, mold fouling during the vulcanization process is a rock-ribbed problem that not only leads to the loss in productivity and degradation of product quality but also results in severe accidents and enormous economic losses. In this work, a promising Co-Mo/CeO 2 composite coating was electroplated and investigated to solve the mold fouling problem. The effect of CeO 2 content on the surface morphology, microstructure, hardness, tribological and electrochemical behavior is systematically studied. With an addition of 10 g/L CeO 2 , the Co-Mo/CeO 2 composite coating not only possesses the highest microhardness, the best wear and corrosion resistance but also features hydrophobicity and remarkable mold antifouling performance. This study offers a new strategy for producing composite coatings with excellent performance to reduce mold fouling in practical tire industry applications. Graphical Abstract
Co-Mo/CeO 2 composite coatings with excellent corrosion and wear resistance as well as low surface energy were simply electrodeposited and applicated for antifouling in tire mold for the first time.
研究领域:
材料科学
·
表面工程
·
橡胶工业
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Bowen Lu,Ziqiang Han,Xinyu Zhi,Liqi Zhang
NiFe 2 O 4 exhibits excellent redox properties and is widely applied in catalytic reactions. However, rapid inactivation under reaction conditions limited its industrial applications. In this study, CeO 2 -NiFe 2 O 4 composite catalysts were synthesized, and the Reverse Water Gas Shift (RWGS) reaction was measured to reveal its CO 2 hydrogenation performance under a high-temperature condition. NiFe 2 O 4 catalysts got deactivated after being reduced to Fe-Ni alloy at 700 °C, decreasing the CO 2 conversion rate. CeO 2 addition can significantly improve its high-temperature activity, and 20CeO 2 -NiFe 2 O 4 exhibited the best catalytic activity (80.85 %, 700 °C). The CeO 2 -confined maintained Ni-Fe alloy with a relatively small crystal size and larger specific surface area, supporting more active sites for CO 2 hydrogenation. CeO 2 addition induced higher oxygen vacancy concentration, enhancing CO 2 activation and formates species formed on 20CeO 2 -NiFe 2 O 4 , resulting in higher CO 2 conversion activity. In addition, 20CeO 2 -NiFe 2 O 4 maintained its catalytic stability for 50 h at 700 °C. The CeO 2 confined enhanced the high-temperature stability of Fe-Ni alloy. CeO 2 and formed CeFeO 3 dispersed in 20CeO 2 -NiFe 2 O 4 inhibited excessive aggregation of Fe-Ni alloy, and CeO 2 inhibited carbon deposition on Fe-Ni alloy, improving Fe-Ni alloy’s reaction stability under RWGS reaction conditions. CeO 2 confined may give insight into improving metal stability under high-temperature and reductive conditions in heterogeneous catalysis.
研究领域:
催化化学
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2019
·
IF 5.256
Chi Li,Yuanyuan Zhang,Ting Zeng,Xinyue Chen,Wenqian Wang,Qijin Wan,Nianjun Yang
To explore suitable sensing materials for sensitive and selective detection of phenolic pollutants, CeO 2 nanocubes, nanopolyhedras, and nanorods were synthesized by a hydrothermal method . These CeO 2 nanomaterials were further loaded on the support of graphene nanoplatelets . As-synthesized nanomaterials and nanocomposites were characterized using transmission electron microscopy , X-ray diffraction and Raman spectroscopy as well as electrochemical techniques including cyclic voltammetry , electrochemical impedance spectroscopy , and differential pulse voltammetry . The nanocomposite of graphene nanoplatelets with CeO 2 nanorods shows the highest electrochemical activity towards soluble species. Highly sensitive and selective determination of tetrabromobisphenol A, catechol , diethylstilbestrol , and nonylphenol was thus achieved at this nanocomposite based electrode. Their limits of detection were as low as 1.8, 42, 1.5 and 2.7 nM, respectively. Such an electrochemical sensor is thus promising for simple, fast and sensitive electrochemical determining of trace-leveled phenolic pollutants in water samples.
研究领域:
环境科学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemCatChem
·
2022
·Vol. 14
·期 21
·e202200762
·
IF 5.497
Mingyue Liao,Yingying Chen,Minmin Chen,Kang Hui Lim,Ziwei Li,Hong Wu,Xiong He,Qiao Zhou,Sibudjing Kawi
Graphical Reforming of methane : A series of CeO 2 nanorod@Ni phyllosilicate (CeO 2 @NiPhy) catalysts with good sintering resistance of both Ni and CeO 2 were designed for CO 2 reforming of methane (DRM) reaction. With the NiPhy shell thickness of 9 nm, CeO 2 @NiPhy-9 shows stable performance for DRM. In-situ diffuse reflectance infrared Fourier transform spectra result demonstrates that DRM reaction takes place with a bi-functional mechanism on CeO 2 @NiPhy. Preventing the sintering of nano-catalyst is crucial to maintain their performance especially for high-temperature reactions such as CO 2 reforming of methane (DRM) reaction. In this paper, we design CeO 2 nanorod@Ni phyllosilicate (CeO 2 @NiPhy) catalysts with different NiPhy shell thickness to simultaneously preserve the morphology of CeO 2 nanorod and prevent the sintering of Ni. Compared with Ni/CeO 2 supported catalyst, CeO 2 @NiPhy core-shell catalyst with a shell thickness of 9 nm exhibits much better performance for DRM with stable CH 4 and CO 2 conversions of 75 % and 80 % respectively and lower carbon deposition due to high Ni sintering resistance and higher thermal stability of CeO 2 during calcination and DRM reaction thereby higher oxygen vacancies concentration. In-situ diffuse reflectance infrared Fourier transform spectra result demonstrates that DRM reaction takes place with a bi-functional mechanism on CeO 2 @NiPhy. This design strategy can be applied to prepare other nano-catalysts with high sintering resistance of both active metal and catalyst support for high-temperature applications.
研究领域:
催化
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）