Amount Of Ce Doping Research Articles

Fabrication and catalytic assessment of Ni/Ce–Zr–O catalyst for enhanced hydrogen production via steam reforming of glycerol

The valorization of glycerol, a plentiful byproduct derived from the biodiesel industry, for green hydrogen production via steam reforming (GSR) has attracted considerable attention. Nevertheless, catalysts developed for GSR encounter critical obstacles related to thermal stability and coke deposition during prolonged operations. In this study, we strategically employed thermally stable ZrO2 as a support along with redox-active Ce as a promoter for Ni to optimize both the preparation method and constituent content of the Ce-promoted Ni/ZrO2 catalyst for GSR. The physicochemical properties of both fresh and GSR-used catalysts were investigated using a range of characterization techniques, including XRD, H2-TPR, SEM-EDS/TEM, N2 adsorption/desorption, and TGA. The results demonstrate that the sol-gel method yields a Ni/Ce–Zr–O catalyst with smaller Ni crystals and a higher surface nickel content compared to the step impregnation and co-precipitation methods, thereby achieving enhanced catalytic activity. Moreover, the catalyst prepared by the sol-gel method exhibited excellent activity stability at elevated feedstock concentrations. Furthermore, it has been determined that there is an optimized amount of Ce doping for the Ni/ZrO2 catalyst, which allows the catalyst to achieve the highest pore parameters and surface nickel content. Among the studied catalysts, the one containing 30/50 wt% of designed CeO2/ZrO2 achieved the highest and most stable H2 yield (4.32 mol⋅mol−1) and carbon gasification efficiency (70.28 %) during a 24-h's GSR with a feedstock concentration of 15 wt% at 500 °C (with a WHSV of 45 h−1). Importantly, this optimized Ni/Ce–Zr–O catalyst effectively eliminates the deposition of filamentous/crystallized coke during long-term GSR operation due to enhanced oxygen vacancies created by the formed CexZr1-xO2 species, making it highly promising for large-scale applications.

The Affects of Ce Doping Cr\(_2\)O\(_3\) Based Catalysts Supported on Activated Carbon for 1,2-Dichloroethane Abatement

Hydrothermal method is used to prepare activated carbon (AC) supported chromium-based catalysts for the catalytic combustion of 1,2-dichloroethane (DCE). The physicochemical properties relating catalysts are evaluated by several characterization techniques such as XRD, SEM, XPS, N2 adsorption-desorption isotherms, H2-TPR and NH3-TPR. The outcomes demonstrated that the Cr2O3 is the perfect targeted base catalyst adding to the facts that the hydrothermal approach is an appropriate way to create catalysts with superior properties. The textural characteristics, reducibility, and acidity of the Cr-based catalysts were all enhanced by the addition of cerium (Ce) and AC. Nevertheless, the research shows how crucial the Ce doping amount is for adjusting the physicochemical characteristics and catalytic efficacy of Cr-based catalysts. The catalyst 20Ce-Cr/AC has the maximum catalytic activity when it came to DCE combustion, where its T50 and T90 attaining of 247°C and 269.5°C, correspondingly. This is explained by the ideal Ce doping level, which improves the redox characteristics and revealed more active sites.

High-pressure hydrothermal dope Ce into MoVTeNbOx for one-step oxidation of propylene to acrylic acid

A high-pressure hydrothermal method was employed to introduce Ce element facilely into MoVTeNbOx catalysts in 0.5 h. It was indicated that Ce atoms were doped into the framework of MoVTeNbOx without changing the unique crystal structure of MoVTeNbOx. The introduction of Ce could facilitate the formation of oxygen vacancies and improve the redox ability of surfacial V. However, it was worth noting that the doping amount of Ce was negatively related to the content of M1 active phase. Within a certain range, the catalytic performance could be improved by sacrificing an appropriate amount of M1 phase. In the conversion of propylene to acrylic acid, the highest yield of 58.2% was obtained under catalyst MoVTeNbCeOx (V: Ce =1: 0.05) at 380 °C with the M1 phase content of 81.6%. The appropriate amount of Ce doping improved the propylene conversion by more than 20% compared to undoped. Moreover, the changes in Gibbs free energy of the rate-limiting step of direct oxidation of propylene before and after Ce doping were evaluated by Density functional theory (DFT). It is illustrated that the doping of Ce is thought to affect the main reason for the reduction of Gibbs free energy.

Improved hydrogen production performance from methanol steam reforming by Ce‐doped CuO–Y2O3 catalysts

AbstractCompared with the relatively simple monometallic and bimetallic oxide catalytic systems, polymetallic catalysts have attracted much attention in recent years. CuO–(Y2O3)(1−x)/2(CeO2)x (x = 0, 0.2, 0.4, 0.6, 0.8, and 1) polymetallic catalyst for hydrogen production by methanol steam reforming(MSR) was prepared by sol–gel method and characterized by X‐ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy, X‐ray photoelectron spectroscopy (XPS), and Specific surface area and pore size analyser(BET) techniques. XRD results show that the diffraction peaks of CuO–(Y2O3)0.4(CeO2)0.2 are sharp and intense, indicating that it is highly crystalline. SEM results show that the pore structure of catalyst becomes loose with the increase of Ce doping amount, and the catalyst particles become more uniform in size and more loose in shape. The BET results show that compared with other catalysts, CuO–(Y2O3)0.4(CeO2)0.2 catalyst has larger specific surface area, which improves the catalytic performance. XPS results showed that CuO–(Y2O3)0.4(CeO2)0.2 still had catalytic activity after reduction treatment. The results of MSR showed that the doping amount of cerium and the reaction conditions affected the catalytic performance of the catalyst. Ce doping promoted the synergistic effect of Cu and Y, and the hydrogen production of CuO–(Y2O3)0.4(CeO2)0.2 was the highest (about 6.74 × 10−3 mol/min/gcat). Ce doping leads to the change of CO/CO2 selectivity in gas products. The CO selectivity of CuO–(Y2O3)0.4(CeO2)0.2 catalyst is only 2% under the catalytic conditions of 400°C, W/M 4:1, and LHSV 20 h−1, which shows good catalytic activity.

Enhanced catalytic activity for methane dry reforming of Ce-doped Ba0.9Zr0.7Y0.2Ni0.1O3-δ perovskite catalyst

Dry reforming of methane (DRM) holds great economic value and environmental protection significance. In our previous study, an in-situ reduced Ni-doped BaZrO3-δ-based catalyst was used as the DRM reforming layer, which exhibited remarkable coking-resistance. To further enhance its DRM catalytic activity and durability, Ce was doped at the B-site of Ba0.9Zr0.7Y0.2Ni0.1O3-δ, and the positive effects of Ce doping on DRM catalytic activity was investigated. Among the various Ce-doped catalysts, the perovskite catalyst with a Ce doping amount of 20 mol. % (i.e., Ba0.9Zr0.5Ce0.2Y0.2Ni0.1O3-δ) demonstrated the highest catalytic activity. At 750 °C, the CH4 and CO2 conversions reached as high as 80.1 % and 85.3 % respectively. Additionally, this catalyst exhibited excellent DRM catalytic durability, and no coking was detected after a 60 h durability test at 700 °C. The enhanced DRM catalytic activity and high coking-resistance can be attributed to the increased concentration of oxygen vacancies, improved hydration capacity, and enhanced CO2 adsorption capacity. The Ce doping in perovskite catalysts provides valuable insights for the construction of DRM catalysts with superior catalytic activity and durability.

Ce doped LaAlO3 pigments with high NIR reflectance and modification of thermal aging properties of polyvinyl chloride

Based on the modified weather resistance of PVC plastics, a series of La1-xCexAlO3 inorganic pigments were synthesized in this study. A single La1-xCexAlO3 (x varies from 0.00 to 0.20) phase replacement solid solution of rhombohedral crystal structure with the addition of more Ce3+ doping. The sample pigments demonstrated a curved rod to spherical particle morphology change as Ce doping amount increased. The analysis by X-ray photoelectron spectroscopy (XPS) demonstrated that the cerium ion chemical valence states in the synthesized samples were + 3 and + 4. The carrier concentration and electron trap theory can be used to understand the variation in near-infrared reflectance of La1-xCexAlO3 pigment powder from 72.55% to 83.35%. Electric charge transfer (La 3d ↔ Ce 3d) can be used to describe how the La1-xCexAlO3 pigment shifts from white to orange to yellow. When PVC plastic is modified with pigment, the near-infrared reflectance varies from 52.87% to 61.63%. Inner surface temperature of La1-xCexAlO3/PVC composite plastics can be lowered by 8.5–13.7 °C, and the weather resistance of the modified PVC plastic is greatly increased. In conclusion, the modification of PVC plastics with La1-xCexAlO3 inorganic pigments can significantly reduce the surface temperature of plastics and prolong their service life.

Promotion Effects of Ce-Doping on Catalytic Oxidation of Ethane over Pt/CexTi1−xO2

The catalytic oxidation of VOCs is widely acknowledged as the most available technology to reduce air pollution. Among the catalysts for VOCs, 1 wt%-Pt/TiO2 catalysts using metal as a doping element have shown amazing potential in many fields. However, achieving high catalytic performance at relatively low temperatures based on the activation of molecules is still a formidable challenge owing to the catalytic activity being highly dependent on temperature. Here, the role of the rare earth metal Ce in the catalytic oxidation of ethane was studied by preparing Pt/CexTi1−xO2 (x = 0, 0.002, 0.005, 0.01, 0.02, and 0.05) catalysts. When the Ce/(Ce+Ti) molar ratio was 0.01, Pt/Ce0.01Ti0.99O2 achieved 90% ethane conversion at 436 °C. This reaction temperature is 15% lower than that for Pt/TiO2. The characterization results show that the doping of Ce caused lattice expansion of TiO2 and its distortion brought about by oxygen vacancies. Additionally, the appropriate amount of Ce-doping can alter the interaction between the active component Pt and the carrier TiO2, thereby improving the activity and concentration of the active surface lattice oxygen species of the catalyst. These results provide a foundation for the design of the catalytic oxidation of VOCs under mild operating conditions.

Regulating Lewis acidity and local electron density of iron-based metal organic frameworks via cerium doping for efficient photo-Fenton process

The photo-Fenton performance of Fe-based metal organic frameworks (Fe-MOFs) largely depends on the amount and the local electron density of metal coordinately unsaturated sites (M CUSs). However, a majority of Fe active sites are fully bound by organic ligands leading to decreased Fe CUSs. Additionally, the symmetrical electronic distribution of iron-oxo (Fe-O) clusters and the fast electron-hole recombination are unbeneficial for the directional electron transfer and the following electron accumulation on Fe CUSs. Herein, the structure of Fe-O clusters onto the framework of MIL-88B was controllably regulated via change of Ce doping amount, among which Fe0.8Ce0.2-MIL-88B exhibited highest removal efficiency of tetracycline (TC). That was mainly ascribed to the following two points: for one, the induced ligand missing defects ameliorated the pore structures and generated more M CUSs; for another, the lower electronegativity of Ce than Fe and the role of ligand missing defects as electron trap state collectively increased the local electron density at Fe CUSs. As a result, the increased M CUSs provided more active sites for H2O2 coordination and the highly concentrated electrons density at Fe CUSs afforded the substantial electron donation towards robust H2O2 dissociation into ∙OH. Furthermore, the increased mesoporous size favored highly-efficient utilization of ∙OH. This work provides a facile strategy to improve photo-Fenton performance of Fe-MOFs.

Effect of Ce-doping on microstructure and electrical properties of LaAlO3 ceramics

A series of novel negative temperature coefficient (NTC) thermistor materials based on La1-xCexAlO3 (0 ≤ x ≤ 0.2) ceramics were synthesized via the solid-state route. X-ray diffraction results confirmed the successful doping of Ce in the La1-xCexAlO3 crystal and the formation of a good solid solution. Scanning electron microscopy results indicated that Ce doping is beneficial for grain growth and reduces the porosity of the samples. With the increase in the Ce doping amount, the average grain size increased from 2.1793 to 10.7344 μm, and densities of the ceramics increased from 93.15% to 99.26%. The temperature vs resistance curve indicated that Ce doping reduces the resistivity of LaAlO3 materials, while reducing the B200/1400 value of the LaAlO3 ceramic. For a doping amount of 0.2, the B200/1400 value of the LaAlO3 ceramic decreased from 18175.1 to 4897.7K, and the resistivity at 1000 °C decreased from 68971.87 to 1105.15 Ω cm. In addition, the La1-xCexAlO3 (0 ≤ x ≤ 0.2) series materials exhibited good linear NTC characteristics. X-ray photoelectron spectroscopy results revealed that the resistivity of the LaAlO3 materials decreased after Ce doping owing to the transformation between the Ce4+ and Ce3+ valence states，and the concentration of Ce3+ increased with the increase in the Ce doping amount. Ce3+ increases the concentration of oxygen vacancies, decreasing the resistance. Impedance analysis findings suggested that the resistance of the La1-xCexAlO3 (0 ＜ x ≤ 0.2) material mainly originates from the grain. These results indicate that Ce doping is an effective method to reduce the resistivity of LaAlO3. Consequently, La1-xCexAlO3 (0 ≤ x ≤ 0.2) is a promising material for NTC applications.

Electroelastic Coupled-Wave Scattering and Dynamic Stress Concentration of Triangular Defect Piezoceramics

In this paper, a method to calculate the dynamic stress concentration around the triangular defect of piezoelectric material under electroelastic coupling is studied and applied to the promising barium calcium zirconate titanate. Firstly, the electroelastic governing equation is decomposed by decoupling technique, and the analytical solutions of elastic wave field and electric field are obtained by wave function expansion method. Then, the conformal transformation is used to simplify the triangle boundary into a circular boundary, and the corresponding modal coefficients are determined according to the simplified boundary conditions. Finally, the analytical solution of the dynamic stress concentration factor can be obtained according to the constitutive equation. Substitute the relevant material parameters of (Ba0.85Ca0.15)(Zr0.1Ti0.9)O3 and set different temperatures, Ce doping amount, and incident wave number for numerical simulation. The numerical results show that the incident wave number, piezoelectric properties, and the shape parameters and deflection angle of the triangular defect have a great influence on the dynamic stress around the defect, and some meaningful laws are summarized through analysis.

Hydrothermal Synthesis of Ce-doped ZnO Heterojunction Supported on Carbon Nanofibers with High Visible Light Photocatalytic Activity

Ce/ZnO decorated carbon nanofibers(CNFs) heteroarchitectures(Ce/ZnO/CNFs) have been synthesized using electrospinning technique followed hydrothermal method, which have a high visible light photocatalytic activity. The samples were characterized by means of SEM, FTIR and XRD. The photocatalytic performance of Ce/ZnO/CNFs was tested with the methylene blue in the presence of visible light irradiation. In this work, we have analyzed the effects of Ce doping amount, initial methylene blue(MB) concentration and dosage of Ce/ZnO/CNFs on photocatalytic efficiency of the composite. The results showed that the photocatalyst containing 1.0% Ce in molarity(CZC1) obtained by autoclaving at 150 °C has the best photocatalytic degradation of MB than other as-synthesized samples. Ce/ZnO/CNFs catalysts exhibit a good stability and reusability, which would be an economical and environmentally friendly photocatalyst for various practical applications.

CO2 hydrogenation over FSP-made iron supported on cerium modified alumina catalyst

Nanocrystalline Fe/Al2O3 and Fe/Ce-Al2O3 catalysts have been synthesized by using one-step flame spray pyrolysis technique (FSP). For comparison purposes, the similar catalysts were also prepared by the conventional impregnation method. The FSP-made Fe/Al2O3 and Fe/Ce-Al2O3 with 3 and 5 wt % Ce exhibited the crystal structure mainly of FeAl2O4 spinel phase and small trace of alumina without the presence of other phases such as iron oxide or cerium oxide phases. However, addition of 7 wt % Ce, the additional peaks of both CeO2 and Fe2O3 were observed. The XPS and TPR results suggest the presence of Fe2O3 cluster on the FSP-made catalyst surface. The catalytic performance of the FSP-made catalysts in terms of both CO2 reaction rate and selectivity to hydrocarbon were much better than those prepared by impregnation method. Addition of Ce also promoted the CO2 hydrogenation rate and hydrocarbon selectivity. Improvement of catalytic properties of FSP-made catalysts was probably due to the high interaction of Fe and Al2O3, which led to the high dispersion of Fe2O3 on catalyst surface. Addition of Ce promoted the formation of iron carbide, which was the active site for hydrocarbon formation, however, excessive amount of Ce doping could resulted in the coverage of the active sites, resulting in the decrease of catalytic performances.

Hunting for advanced low-energy gamma-rays shielding materials based on PbWO4 through crystal defect engineering

Increasing exposure chances of humans to low-energy gamma-rays occur with the rapid application expansion of nuclear technology, which tend to induce carcinogenic and mutagenic effects on living bodies, and then need to be protected from. PbWO4 has excellent gamma-rays attenuating ability while Pb displays a weak shielding property of low-energy gamma-rays from 40 keV to 88 keV. Here, crystal defect engineering with Ce doping is applied to fabricate the crystal structure of PbWO4 for tailoring its low-energy gamma-rays shielding property. Characterization with XRD, Raman, XPS, XRF, SEM and TEM techniques indicates cerium ions have been introduced into the lattice of PbWO4 crystals during the doping process. In addition, Ce doping amount plays key roles in tuning the crystal defects in PbWO4 including ion substitution, charge compensation and structural deformation. Importantly, PbWO4 doped with 10 mol% Ce displays an optimal mass attenuation coefficient (2.61 cm2/g) to 59.5 keV gamma-rays and shows a 39% increase ratio to the PbWO4 without doping. In addition, typically anisotropic PbWO4 crystals are found at 40 mol% Ce doping amount, which give its potential versatility. This work provides a solution to make up for PbWO4 to shield low-energy gamma-rays that could further promote its application in personal protection, such as clothing.

Enhanced 2, 4-dichlorophenol degradation at pH 3–11 by peroxymonosulfate via controlling the reactive oxygen species over Ce substituted 3D Mn2O3

Peroxymonosulfate (PMS) activation has drawn increasing attention in eliminating the recalcitrant organic pollutants in water. Manipulation of generated reactive oxygen species (ROS) over Ce doped Mn2O3 during the PMS activation was firstly reported for the complete degradation of 2,4-dichlorophenol (2,4-DCP) in this study. Ce in-situ introduction can greatly enhance the PMS activation performance of Mn2O3. For example, 100% of 2,4-DCP degradation can be obtained at 90 min over 4 wt% Ce doped Mn2O3 at pH 7 (82.1% for Mn2O3 at 90 min). The reaction rate constant (k) was also about 3.6 times higher than that of Mn2O3 (0.0668 min−1 for Ce doped Mn2O3 vs. 0.0186 min−1 for Mn2O3). Besides 1O2, OH and SO4− were identified and involved in 2,4-DCP degradation process over Ce doped Mn2O3, while only 1O2 was detected over 3D Mn2O3. Moreover, the contribution of OH and SO4− to 2,4-DCP degradation can be regulated by adjusting the Ce doping amount. The key role of Ce substitution in the regulation of reactive oxygen species was further investigated by XPS and electrochemical experiments. The Ce dopant can lead to a higher current density and greater reductive capability due to the improved charge transfer capability, which is important to the generation of more aggressive OH and SO4− and complete 2,4-DCP degradation.

Properties of Ce-doped Bi0.5Na0.5TiO3 Synthesized using the Soft Combustion Method

In this work, bismuth sodium titanate (BNT) and cerium (Ce)-doped BNTwere successfully synthesized using the soft combustion method. The effect of 3, 5, and 7 mol% Ce, respectively added as dopant on stoichiometry, microstructure, density and dielectric properties were studied. Pure BNT phase was obtained in the sample containing 3 mol% Ce after calcination at 800°C for 3h. The calcined powders were then pressed into pellets and sintered at 1100°C for 3h. The grain size of the pellets decreased with the addition of Ce3+ because Ce acted as a grain growth inhibitor. Maximum density was obtained in 3 mol% Ce-doped BNT, and decreased with increasing amount of Ce dopant. In addition, the maximum dielectric constant of 468.35 was obtained in 3 mol% Ce-doped BNT and decreased at higher amount of Ce doping. The addition of Ce as a dopant in BNT also decreased the dielectric loss.

Structurally modified cerium doped hydrotalcite-like precursor as efficient catalysts for hydrogen production from sodium borohydride hydrolysis

Rare earth metal doped HTLPs (hydrotalcites-like precursors) were successfully synthesized by co-precipitation method. The prepared HTLPs were characterized by FE-SEM (field emission scanning electron microscopy), EDX (energy dispersive X-ray spectrometer), Fourier transform infrared spectroscopy (FT-IR), XRD (X-ray diffraction), BET (Brunauer–Emmett–Teller) technique. BET surface analysis results revealed that the surface area of Ce doped HTLPs are quite high than un-doped precursors. Further, the catalytic performance of prepared materials was investigated for hydrogen production from sodium borohydride and it was found that a small amount of Ce doping thoroughly enhance the catalytic activity of HTLPs. BET and XRD results clearly indicated that sizeable change in framework and surface restructuring could occur during cerium doping resulting beneficial effect on its catalytic performances and HTLPs are highly stable even at highly basic conditions. The reaction conditions such as temperature ranging from 25 °C to 75 °C, catalyst amount of 0.08 wt % to 0.16 wt % while molar percent of cerium from 2 mol % to 10 mol %, respectively were investigated. Moreover, it is very convenient to recover the catalyst at the end of reactions; the solid catalyst left could be readily reused for the next consecutive cycles.

Enhanced time response of 1-in. LaBr3(Ce) crystals by leading edge and constant fraction techniques

We have characterized in depth the time response of three detectors equipped with cylindrical LaBr3(Ce) crystals with dimensions of 1-in. in height and 1-in. in diameter, and having nominal Ce doping concentration of 5%, 8% and 10%. Measurements were performed at 60Co and 22Na γ-ray energies against a fast BaF2 reference detector. The time resolution was optimized by the choice of the photomultiplier bias voltage and the fine tuning of the parameters of the constant fraction discriminator, namely the zero-crossing and the external delay. We report here on the optimal time resolution of the three crystals. It is observed that timing properties are influenced by the amount of Ce doping and the crystal homogeneity. For the crystal with 8% of Ce doping the use of the ORTEC 935 CFD at very shorts delays in addition to the Hamamatsu R9779 PMT has made it possible to improve the LaBr3(Ce) time resolution from the best literature value at 60Co photon energies to below 100ps.

Preparation and characterization of electrospun La1−xCexCoOδ: Application to catalytic oxidation of benzene

An electrospinning with calcination process was employed for the synthesis of La1−xCexCoOδ (x=0, 0.2, 0.4, 0.6, 0.8, and 1.0) oxides. These catalysts were investigated in terms of total benzene oxidation, and characterized by means of XRD, BET, H2-TPR, SEM, XPS, and TEM techniques. The results show that the amount of Ce doping obviously affects the physicochemical and catalytic properties of La1−xCexCoOδ, and when x=1.0, CeCoOδ exhibits the best activity and highly thermal durability for catalytic oxidation of benzene. Additionally, it is demonstrated that the increased activity over perovskite phase dominated oxides is ascribed to a larger surface area while the activity enhancement over metal oxides mainly results from a higher valance of Co and better redox property.

Thermoelectric properties of Ce‐doped n‐type CexBi2 − xTe2.7Se0.3 nanocomposites

AbstractCe‐doped CexBi2 − xTe2.7Se0.3 (x = 0–0.3) nanopowders were synthesized by the hydrothermal method and the obtained nanopowders were hot‐pressed into bulk at 673 K under a pressure of 60 MPa in vacuum. The results show that Ce doping has significant effects on the morphologies of the nanopowders. With increasing Ce doping amount the morphology of the nanopowder changes from nanosheets to nanorods. The thermoelectric (TE) properties measurements show that Ce doping can increase the electrical conductivity greatly, but has little effect on improving Seebeck coefficient and thermal conductivity. There is an optimum value of Ce doping amount. The Ce0.2Bi1.8Se0.3Te2.7 sample shows a highest figure of merit of 0.85 at 413 K as compared to other samples prepared in same conditions.

Synthesis and characterization of YAG: Ce 3+ fluorescence powders by co-precipitation method

YAG:Ce 3+(Yttrium aluminum garnet) fluorescence powders were successfully prepared by co-precipitation method using aluminum nitrate, yttrium nitrate, cerous nitrate as the starting materials and ammonium carbonate as precipitant. The products were characterized by X-ray powder diffraction, luminescence spectrometer, transmission electron microscope (TEM). The XRD results showed that the obtained YAG:Ce 3+ fluorescence powders had the crystalline structures of YAG at calcinations temperature of 900 °C and the TEM results showed that the grain diameters were about 100 nm. The YAG:Ce 3+ fluorescence powders, synthesized by co-precipitation method, had the best luminescence property when the Ce doping amount was x=0.06 in the molecular formula of Y 3- x Ce x Al 5O 12, the calcinations time was 2 h and the calcinations temperature was 1000 °C.