Frontiers of Chemical Science and Engineering
·
2017
·Vol. 11
·期 4
·586-593
·
IF 1.712
Liu Huan,Ma Zhen
Hexagonal CePO 4 nanorods were prepared by a precipitation method and hexagonal CePO 4 nanowires were prepared by hydrothermal synthesis at 150 °C. Rh (NO 3 ) 3 was then used as a precursor for the impregnation of Rh 2 O 3 onto these CePO 4 materials. The Rh 2 O 3 supported on the CePO 4 nanowires was much more active for the catalytic decomposition of N 2 O than the Rh 2 O 3 supported on CePO 4 nanorods. The stability of both catalysts as a function of time on stream was studied and the influence of the co-feed (CO 2 , O 2 , H 2 O or O 2 /H 2 O) on the N 2 O decomposition was also investigated. The samples were characterized by N 2 adsorption-desorption, inductively coupled plasma optical emission spectroscopy, X-ray diffraction, transmission electron microscopy, X-ray photoelectron microscopy, hydrogen temperature-programmed reduction, oxygen temperature-programmed desorption, and CO 2 temperature-programmed desorption in order to correlate the physicochemical and catalytic properties.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2016
·
IF 2.101
Xiaoniu Yu,Chunxiang Qian
Nano-sized CePO 4 @NaCe(SO 4 ) 2 (H 2 O) and CePO 4 with hexagonal phase have been prepared by simply varying the reactant P/Ce molar ratio in bacterial liquid. The phase composition of two samples was checked via Fourier transform infrared spectroscopy (FTIR), energy dispersive analysis of X-rays (EDS) and X-ray diffraction (XRD) analyses, displaying the presence of CePO 4 @NaCe(SO 4 ) 2 (H 2 O) and CePO 4 with average crystallite size are 32.34 and 15.61 nm, respectively. The scanning electron microscopy (SEM) images show that nano-clusters and sphere-like in shape with a narrow diameter distribution were observed in two samples. The transmission electron microscopy (TEM) photographs further indicate obtained CePO 4 @NaCe(SO 4 ) 2 (H 2 O) and CePO 4 nanoparticles correspond to nanosheets and nanorods , respectively. The emission spectra of CePO 4 @NaCe(SO 4 ) 2 (H 2 O) and CePO 4 display a broad band of 300–380 nm range with the strongest emission at 342 nm in the violet region.
研究领域:
材料科学
·
纳米技术
·
化学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Ruijia Diao,G.P. Nayaka,Chengyi Zhu,Xiaohua Yu,Yannan Zhang,Ju Rong,Xiao Wang,Yingjie Zhang,Peng Dong,Mingyu Zhang,Xi Yang,Zhaolin Zhan
A facile hydrothermal method is successfully developed for the synthesis of CePO4 coated LiNi0.6Co0.2Mn0.2O2 (NCM 622) cathodes. The as-prepared samples are characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), electrochemical workstation, electrochemical impedance spectroscopy (EIS) and inductively coupled plasma emission spectrometry (ICP). Compared to the pristine NCM 622 cathode, the rate capacity and cyclic performance are significantly improved after coating. Even under a 10 C charge/discharge rate, the initial discharge capacity of the 3.0-NCM sample is up to 95.2 mAh . g -1 . Furthermore, the as- prepared 3.0-NCM sample exhibits excellent cyclic performance with 96.8% capacity retention at 1 C under 55 o C after 100 cycles, while the pure NCM 622 only delivers poor capacity retention of 71.4%. The above conclusions can be characterized that CePO4 coating layer can effectively avert the secondary reaction between electrolyte and cathode material. In addition, the CePO4 coating layer can significantly suppress the dissolution of cathodes in the electrolyte, which contributes to the excellent rate performance and cycle stability.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Zhenshuai Wu,Shuai Wang,Daowei Gao,Riming Hu,Xuchuan Jiang,Guozhu Chen
Supported catalysts are widely used in selective hydrogenation of nitroarenes, in which the choice of support has an important effect on the catalytic reaction rate and the selectivity of products. Herein, CePO 4 as support to stabilize Pt nanoparticles for selective hydrogenation of nitroarenes is presented. The catalyst achieves a remarkable selectivity of aromatic amine production (>95 %) with a high turnover frequency (1476 h −1 ). Mechanistic studies reveals that the electronic structure of Pt is modulated by CePO 4 . In comparison to conventional CeO 2 /Pt catalyst, the Pt sites on CePO 4 are negatively charged. Such configuration allows facile dissociation of H 2 on Pt sites. Meanwhile, the potential-determining step (the formation of Ph-HNOH from Ph-HNO) on CePO 4 /Pt (0.73 eV) is a significantly lower than CeO 2 /Pt (1.15 eV), thereby favoring the pathway for aromatic amine production on Pt sites. Moreover, the CePO 4 support has strong adsorption capacity of substrate, which plays a role as new active sites when adsorbed substrates are activated by active hydrogen species via hydrogen spillover. This work provides a new perspective into the development of selective nitroarenes conversion through the artful design of supported catalysts.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Jiangxiao Qiao,Jinxin Gan,Fei Gao,Xiangsen Xu,Jiesong Tan,Yiqing Zeng,Feng Zhang,Feng Han,Zhaoxiang Zhong,Weihong Xing
Synergistic removal of nitrogen oxides (NOx) and particulate matter (PM) can be achieved using multifunctional catalytic membranes. In this work, CePO4 nanorods were loaded on the pore surfaces of SiC membranes to construct the CePO4/SiC-X catalytic membranes. The stacked nanorod structure of the CePO4 catalyst layer facilitates the diffusion of gases to the catalyst surface during reactions. Owing to the high specific surface area, rich surface acidity, and strong redox capacity, the CePO4/SiC-400 catalytic membrane exhibits the best ammonia-selective catalytic reduction (NH3–SCR) denitration activity, achieving >90% NO conversion at a temperature of 250–380 °C and negligible N2O byproduct. In addition, the CePO4/SiC-400 catalytic membrane demonstrates excellent H2O and SO2 resistance. The performance of dust filtration and simultaneous dust filtration and denitration at 250–350 °C proposed that the dust rejection efficiency reached more than 99% at various conditions, and the dust filtration process did not affect the NH3–SCR performance of the CePO4/SiC-400 catalytic membrane. From the above results, the CePO4/SiC-400 catalytic membrane presents a broad application prospect in the simultaneous dust removal and denitration of high-temperature flue gas.
研究领域:
环境科学
·
催化材料
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2018
·Vol. 20
·期 40
·6351-6357
·
IF 3.304
Kui-Suo Yang,Yi-Lian Li,Yang-Yang Ma,Li-Na Feng,An-Ping Wu,Yan Qiao,Jin-Rong Bao,Wen-Xian Li,Xiao-Wei Zhu,Ran-Bo Yu
A novel core–shell–shell SiO2@CePO4:Tb@SiO2 submicro-sphere was controllably synthesized by a bridging ligand organosilane HOOCC6H4N(CONH(CH2)3Si(OCH2CH3)3)2 (MABA-Si) connecting the silica core and rare earth ions. The as-synthesized samples were investigated using scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and infrared spectroscopy (IR). It is found that SiO2@CePO4:Tb@SiO2 has a ∼25 nm outermost shell, a ∼4 nm intermediate shell, and a ∼200 nm core. SiO2@CePO4:Tb@SiO2 exhibits stable photoluminescence properties in aqueous solution: its photoluminescence intensity was unquenched even after 15 days. The core–shell–shell submicro-spheres were found to have better photoluminescence than the core–shell submicro-spheres because the SiO2 shell protected the phosphor materials and then improved its photoluminescence intensity and biocompatibility. A formation mechanism of the core–shell–shell SiO2@CePO4:Tb@SiO2 submicro-spheres was proposed. Thus, the low-cost preparation of the core–shell–shell SiO2@CePO4:Tb@SiO2 submicro-spheres could be rationally achieved using SiO2.
研究领域:
材料科学
·
纳米技术
·
光学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2021
·
IF 3.712
Yiqing Zeng,Shule Zhang
Revealing the active species of the catalyst is conducive to the design of more efficient catalyst. Herein, we tried to demonstrate the roles of amorphous and crystalline structures on CePO 4 catalyst during selective catalytic reduction (SCR) of NO x by NH 3 . Higher calcination temperature promotes the transfer of amorphous structure to crystalline structure on the surface of CePO 4 . Both amorphous and crystalline CePO 4 species on CePO- X samples can provide acid sites for NH 3 adsorption, but the former can provide more acid sites. The superior redox property of surface amorphous CePO 4 species contributes to its high NH 3 -SCR activity at low temperature, but it also leads to the decrease of high temperature (>350 °C) NH 3 -SCR activity due to the oxidation of NH 3 . In contrast, crystalline CePO 4 species shows high activity only at high temperature because of its poor redox property. Therefore, it can be inferred that amorphous and crystalline structures on CePO 4 catalyst can be the efficient active species of NH 3 -SCR at low and high temperature, respectively.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Shuai Wang,Zhenshuai Wu,Changxu Wang,Rongyao Wang,Huabin Lian,Riming Hu,Daowei Gao,Xuchuan Jiang,Yipin Lv,Guan Wang,Guozhu Chen
The hydrogenation of nitroaromatics to aromatic amines is widely applied in the chemical, pharmaceutical, and agrochemical industries. However, the high cost of traditional precious metal-supported catalysts limits their industrial development. To address this, a PtCo alloy nanoparticle catalyst supported on CePO 4 (CePO 4 /PtCo) was designed. The catalyst exhibits high activity and selectivity for the hydrogenation of nitroaromatics under 60 °C and 5 bar H 2 , achieving 100 % conversion of p-nitrophenol and 98.2 % selectivity to aromatic amines within 50 min. Catalytic mechanism studies indicate that the multi-level modulation of active sites is achieved through the synergistic interplay of dual mechanisms: electron transfer within PtCo alloys and metal-support interactions between PtCo and CePO 4 . This multiple synergy enables precise electronic tuning of Pt sites, enhancing the adsorption capacity for nitroaromatics and reducing the reaction energy barriers of potential-determination steps. Meanwhile, the functional support CePO 4 adsorbs and activates the substrate, providing additional active sites for hydrogenation under hydrogen spillover. The multiple synergistic effects between the components of the catalyst revealed in this study provide new insights for the rational design of heterogeneous catalysts.
研究领域:
催化化学
·
材料科学
·
工业化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Menghong Li,Hong Tang,Jiawei Li,Jiao Han,Yiming Zeng,Ping Yang,Yuanbing Li,Shiqi Li,Xinyu Fan
In this study, a two-step method combining the direct foaming process with the control of solid content and heat treatment temperature was employed to prepare ZrP 2 O 7 -CePO 4 composite porous materials with varying porosities. The results indicate that an increase in solid content and heat treatment temperature leads to a reduction in porosity and average pore size while simultaneously improving the mechanical properties. The porosities, compressive strengths , thermal conductivities , ε and Tanδ ranged from 63.2 to 85.3 vol%, 19.43 to 0.99 MPa, 0.089 to 0.088 W/(m·K), 1.64 to 2.72, and 0.88 × 10 −3 to 1.99 × 10 −3 , respectively. Electromagnetic simulations have validated that ZrP 2 O 7 -CePO 4 composite porous ceramics , when used as the core layer material for A-sandwich antenna radomes, exhibit excellent transmittance properties. This suggests the potential application of these materials for supersonic aircraft antenna radomes.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Xiaolong Zhang,Bo Li,Tingting Chen,Xiang Ke,Rengui Xiao
This manuscript presents a modification method by using nanofillers for simultaneously improving the barrier and corrosion inhibition in epoxy coatings. In this method, polyaniline (PANI) nanofibers are first grown on reduced graphene oxide (RGO) using an in situ polymerization reaction, and then cerium phosphate (CePO 4 ) nanograins are directly modified onto polyaniline/reduced graphene oxide (PANI/RGO) composites using a hydrothermal reaction . A new hydrophobic and corrosion-resistant PANI/RGO/CePO 4 nanocomposite is successfully prepared. Physical and chemical characterization was performed by Fourier transform infrared spectroscopy (FT-IR), ultraviolet–visible spectroscopy (UV–Vis), X-ray diffractometry (XRD), X-ray photoelectron spectroscopy (XPS), and field emission scanning electron microscopy (SEM). PANI/RGO/CePO 4 nanomaterials were compounded into epoxy resin and sprayed on Q235 carbon steel, and their corrosion resistance performance was tested by using AC impedance spectroscopy and salt spray tests. The results show that PANI/RGO/CePO 4 nanocomposites improve the barrier properties of epoxy resin. In addition, X-ray photoelectron spectroscopy (XPS) before and after corrosion showed that the cerium ions and phosphate ions released from CePO 4 in the composite had a corrosion inhibition effect. It forms cerium oxide and iron phosphate corrosion inhibition films on mild steel and cuts off direct contact between the electrolyte and the substrate. This nanomaterial-loaded epoxy coating can greatly improve the composite's anti-corrosion ability.
研究领域:
材料科学
·
腐蚀工程
·
化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Xuesheng Yang,Jiabao Bai,Ya Song,Huawei Yang,Lixia Yang,Liangjiu Bai,Donglei Wei,Xinxiang Cao,Hou Chen
Aerobic oxidative desulfurization (AODS) promises to be a sustainable alternative technology for diesel desulfurization, which necessitates the efficient aerobic oxidation of thiophenic sulfides at mild conditions. Here we synthesize cerium phosphate (CePO4) nanowire-supported vanadium oxide (VOx) nanoclusters, controllably creating coordination-unsaturated V sites for boosting the AODS reaction. We propose that the electron transfer from a Ce species to a V site gives rise to the donor state and enhances its electron-donating capability for the activation of O2. We show that the catalyst possesses a higher specific activity than state-of-the-art vanadium oxide catalysts, activates reaction at 90 °C (5.17 mmol g–1 h–1), and achieves rapid conversion of various thiophenes under mild conditions. The catalyst demonstrates excellent durability in six cycles of reuse by maintaining an unchanged catalytic performance, a chemical structure, and a physical structure and is expected to act as a sustainable, efficient, and stable AODS catalyst.
研究领域:
化学工程
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2019
·Vol. 22
·期 9
·1610-1618
·
IF 3.382
Jie Wang,Xiujuan Wu,Xiang Cao,Youxiang Jiang,Dongen Zhang,Tang Yang,Fan Zhang,Yuhui Luo
Three different morphologies of CePO4 nanocrystals (rods, columns, and spindle-like assembled nanosheets), spindle-like LaPO4, spindle-like PrPO4, and TbPO4 microspheres were successfully synthesized using a hydrothermal method. Interestingly, the morphology of the self-assembled spindle-like CePO4 underwent a change from big spindles to short spindles, to a cluster of spindles, and finally to spindle-like assembled nanocrystals with the increase of time. Using a single-step process, the nanocrystals were fixed on the surface of a glassy carbon electrode (GCE) using a Nafion membrane solution, which increased the specific surface area and electron transfer rate. The presence of CePO4, especially the spindle-like assembled nanosheet CePO4 (S-CePO4), greatly improved the effective surface area of the GCE, thereby increasing the conductivity of the GCE-based electrochemical sensor. The highly ordered superstructures of S-CePO4 were assembled from homogeneous spindles with an average length of 100 nm and a center diameter of approximately 50 nm. The use of the S-CePO4 sensor resulted in a 229% increase of the specific surface area (compared with that of the bare GCE-based sensor) and excellent electrocatalytic performance toward the electrochemical oxidation of hydroquinone (HQ), catechol (CC), and resorcinol. The linear range and detection limit for the determination of CC were 0.07 and 20–1200 μM, respectively. Our findings demonstrate the potential of the S-CePO4@GCE-based electrochemical sensor for the simultaneous determination of CC and HQ. The morphology and structure of S-CePO4 reduced the resistance significantly and increased the effective active surface area and the electrolyte contact area, making it more advantageous to the utilization of the active components.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
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