JOURNAL OF RARE EARTHS
·
2022
·
IF 4.632
Yandi Cai,Peng Yang,Qinglong Liu,Kaili Ma,Wenxin Ma,Wang Song,Qiuhui Qian,Fei Gao,Wei Tan,Lin Dong
Sulfation treatment has been widely used to promote the catalytic performance of ceria (CeO 2 ) based catalysts for the selective catalytic reduction of NO by NH 3 (NH 3 -SCR of NO). Praseodymium oxide (PrO x ), another commonly used rare earth material with similar structural properties as CeO 2 , also shows satisfactory redox properties due to the facile redox cycle of Pr 3+ ↔ Pr 4+ . In this work, gas phase sulfation treatment with varied duration was performed on PrO x at 200 °C, and the NH 3 -SCR activity of sulfated PrO x was evaluated. Based on the results of systematic characterizations (e.g., N 2 -physisorption, NH 3 oxidation , NO oxidation, in situ diffuse Fourier transform infrared spectroscopy), it is revealed that the catalytic performance of sulfated PrO x is highly dependent on the sulfation time (or the amount of sulfate species deposited on PrO x ), which has a significant impact on the competitive reaction between NH 3 oxidation and NH 3 -SCR of NO, thus determining the NH 3 -SCR activity of PrO x . This work provides new insight into tuning the interaction between PrO x surface and reactants (NO, NH 3 ) via sulfation treatment, which cam guide the design and application of PrO x based catalysts for NH 3 -SCR of NO in the future.
研究领域:
化学工程
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
MOLECULES
·
2019
·Vol. 24
·期 23
·4275
·
IF 3.06
Qian-Chun Zhang,Wu-Li Yan,Li Jiang,Yu-Guo Zheng,Jing-Xin Wang,Run-Kun Zhang
In this work, we successfully developed a novel and sensitive gas sensor for the determination of trace acetophenone based on its cataluminescence (CTL) emission on the surface of nano-praseodymium oxide (nano-Pr6O11). The effects of working conditions such as temperature, flow rate, and detecting wavelength on the CTL sensing were investigated in detail. Under the optimized conditions, the sensor exhibited linear response to the acetophenone in the range of 15–280 mg/m3(2.8–52 ppm), with a correlation coefficient (R2) of 0.9968 and a limit of detection (S/N = 3) of 4 mg/m3(0.7 ppm). The selectivity of the sensor was also investigated, no or weak response to other compounds, such as alcohols (methanol, ethanol,n-propanol,iso-propanol,n-butanol), aldehyde (formaldehyde and acetaldehyde), benzenes (toluene,o-xylene,m-xylene,p-xylene),n-pentane, ethyl acetate, ammonia, carbon monoxide, carbon dioxide. Finally, the present sensor was applied to the determination of acetophenone in human exhaled breath samples. The results showed that the sensor has promising application in clinical breath analysis.Keywords:cataluminescence;sensor;acetophenone;Pr6O11
研究领域:
分析化学
·
医学检测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2010
·
IF 1.758
Zhiqiao He,Angliang Zhang,Shuang Song,Zhiwu Liu,Jianmeng Chen,Xinhua Xu,Weiping Liu
In an attempt to utilize ozone effectively, a series of praseodymium-modified γ-Al2O3 (Pr/Al2O3) was prepared via incipient wetness impregnation using Pr(NO3)3·6H2O as the precursor. The structure and properties of the catalysts were studied by X-ray diffraction (XRD) and the Brunauer−Emmett−Teller (BET) method. Catalytic activity was evaluated by monitoring the degradation of succinic acid (SA) in the presence of ozone. The praseodymium modification can effectively enhance the ozonation activity of γ-Al2O3 upon SA removal. Increasing the calcination temperature of Pr/Al2O3 is disadvantageous for the catalytic process, whereas increasing the load of praseodymium is helpful. After three successive cycles, the Pr/Al2O3 catalyst remained stable in the catalytic ozonation of SA. Overall, the initial degradation rate of SA, as well as the saturated adsorption capacity of SA, were found to have a linear relation to changes of the surface hydroxyl groups of the catalyst. On this basis, we conclude that the significant enhancement of SA degradation using Pr/Al2O3 as a catalyst should be because praseodymium, in the form of Pr6O11, promoted the formation of surface hydroxyl groups. Hence, the adsorption was increased, and the degradation rate of SA was enhanced.
研究领域:
环境化学
·
催化科学
·
水污染控制
·
材料化学
·
环境工程
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2017
·
IF 2.843
Xinxin Zhang,Shiyang Cheng,Wei Zhang,Cai Zhang,Nicholas E. Drewett,Xiyang Wang,Dong Wang,Seung Jo Yoo,Jin-Gyu Kim,Weitao Zheng
Ag/Pr6O11 catalysts supported by either Pr6O11 nanorods (Pr6O11-NRs) or nanoparticles (Pr6O11-NPs) were prepared by conventional incipient wetness impregnation. The nanocomposite of Ag/Pr6O11-NRs demonstrated a higher catalytic activity for CO oxidation than Ag/Pr6O11-NPs at lower temperatures. This improved performance may be ascribed to the mesoporous features and resultant oxygen vacancies of the Pr6O11 nanorods support, as well as the large surface area and homogeneous loading of Ag species. As a result, 98.7 and 100% CO conversions were achieved at 210 and 240 °C for Ag/Pr6O11-NRs, while Ag/Pr6O11-NPs require a temperature of 320 °C to obtain the 100% CO conversion rate. These findings reveal that Pr6O11-NRs is the preferable support, comparative to Pr6O11-NPs, for Ag/Pr6O11 catalysts, for CO oxidation.
研究领域:
催化化学
·
纳米材料科学
·
环境化学
·
表面科学
·
能源化学
✓ 已验证
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2024
·Vol. 416
·期 8
·1951-1959
·
IF 3.8
Sun Shuo,Chen Changyu,Fu Xingyu,Zhang Yandong,Wu Xinyue,Hao Junkai,Feng Jing,Hu Lei,Yao Wenli,Yan Zhengquan
To conveniently monitor bioactive cysteine (Cys) and Fe 2+ in practice, a kind of poly-β-cyclodextrin strengthen praseodymium oxide (Pr 6 O 11 ) porous oxidase mimic ( p -β-CD@Pr 6 O 11 ) was constructed by virtue of the strong coordination between nano Pr 6 O 11 and poly-β-cyclodextrin substrate. After its microstructure and physicochemical property were characterized in detail, it was noted that porous p -β-CD@Pr 6 O 11 exhibited excellent enzyme-like catalytic activity to accelerate the oxidation of 3,3′,5,5,′-tetramethylbanzidine (TMB) and 2,2′-azinobis (3-ethylbenzo-thiazoline-6-sulfonic acid) ammonium salt (ABTS) with significant color-enhancement effect in the air. Based on the signal amplification, trace Cys could exclusively deteriorate the UV-vis absorbance at 653 nm of p -β-CD@Pr 6 O 11 -TMB and Fe 2+ alter the one at 729 nm of p -β-CD@Pr 6 O 11 -ABTS with visual color changes. Under the optimized conditions, the proposed p -β-CD@Pr 6 O 11 -TMB and p -β-CD@Pr 6 O 11 -ABTS systems were successfully applied for dual-channel monitoring of Cys in Cys capsules and fetal bovine serum and Fe 2+ in agricultural products with quite low detection limits, i.e., 7.8×10 −9 mol·L −1 for Cys and 6.93×10 −8 mol·L −1 (S/N=3) for Fe 2+ , respectively. The synergetic-enhancement detection mechanisms to Cys and Fe 2+ were also proposed. Graphical
研究领域:
分析化学
·
材料科学
·
生物化学
·
纳米技术
·
环境监测
·
生物传感器
✓ 已验证
DOI
高影响因子
NUCLEAR ENGINEERING AND DESIGN
·
2024
·
IF 1.9
Changfu Wang,Lin Li,Xu Liu,Bobo Shao,Yan Liu,Yun Wang,Shengheng Tan,Zhirong Liu,Shengdong Zhang
The two-step vitrification process involves converting high-level waste from a liquid to a solid state through calcination , followed by melting the calcines with glass matrix material to form glassy wasteforms. The calcination process is a critical stage in the vitrification process. This study investigated the thermal decomposition performance and phase evolution of power reactor simulated high-level waste during the calcination process. As the calcination temperature increased from 100 to 900 °C, the resultant waste calcines showed increasingly darker color and smaller general particle sizes. Below 600 °C, the waste experienced thermal decomposition of nitrate and formate compounds, leading to an approximate 40 wt% weight reduction. At 600 °C, the waste's weight remained constant, and crystalline phases such as Zr x M 1-x O 2 (M = Ce, Pr, Nd), BaMoO 4 , CeO 2 , and Gd x Ce 1-x O 2 were observed.
研究领域:
核化学与化工
·
放射性废物处理
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yawen Wang,Xinyue Zhang,Mengyu Yang,Shilun Fu,Qingjun Zhou
High entropy solid oxide fuel cell (SOFC) cathode materials with a double perovskite structure have attracted considerable attention due to their unique multi-component design and the complex interactions among constituent elements, which endow them with exceptional catalytic performance. We report a double perovskite cathode material, La 0.2 Pr 0.2 Nd 0.2 Sm 0.2 Gd 0.2 BaCo 0.7 Fe 0.7 Ni 0.4 Cu 0.1 Zn 0.1 O 5+δ (LPNSGBCFNCZ), featuring a high-entropy design at the A-site and a medium-entropy design at the B-site, and systematically investigate its structure, electrochemical performance and CO 2 tolerance. The results demonstrate that LPNSGBCFNCZ exhibits excellent redox activity, with an area-specific resistance of only 0.07 Ω·cm 2 at 800 ℃. Furthermore, compared with the non-entropically designed PrBaCo 2 O 5+δ , LPNSGBCFNCZ exhibits superior thermal expansion properties and significantly enhanced tolerance to CO 2 . This performance improvement is attributed to the dual-entropy design of the A and B-sites: the high entropy at the A-site effectively suppresses the formation of BaCO 3 in CO 2 atmospheres, while the medium entropy at the B-site reduces the thermal expansion coefficient by lowering the Co content. This study indicates that LPNSGBCFNCZ is a highly promising SOFC cathode material, further validating the feasibility and effectiveness of the high-entropy strategy in the development of SOFC electrode materials.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Sihao Wang,Chaonan An,Yining Zhang,Xu Wang,Xuepeng Wang,Jing Pan,Fuqiu Ma,Yun Xue,Yongde Yan
Zinc Titanate (ZIT) glass-ceramic composite is a potential candidate waste form for immobilizing radioactive lanthanide oxides due to its relatively high lanthanide embedding capacity and low reaction temperature. However, the composition of lanthanide oxides after electrolytic refining is very complex and the immobilization mechanism of lanthanide oxides by ZIT composite is not clear. Herein, we prepared ZIT-PrEu glass-ceramic waste forms by a solid-phase sintering method at 1200 °C for 4 h using mixed lanthanide oxides of Pr 6 O 11 and Eu 2 O 3 simulated as radioactive waste. The XRD and SEM results show that different mixed lanthanide oxide ratios have very little effect on the composition and microstructure of ZIT-PrEu waste forms with different waste embedding rates. With the increase of waste embedding rate, the density of the ZIT-PrEu glass-ceramic waste forms with different mixed lanthanide oxide ratios first increases and then decreases. When the embedding rate increases to 25 wt%, the density of ZIT-PrEu waste forms with different mixed lanthanide oxide ratios reaches a maximum. The ZIT-PrEu glass-ceramic waste forms embedded with 25 wt% waste exhibit excellent chemical durability, and the leaching rates of Pr ion and Eu ion are only 10 −6 - 10 −7 g m −2 d −1 after 28 days at 90 °C. Moreover, the phase evolution of the ZIT composites immobilizing lanthanide oxides at different temperatures is revealed by XRD and FT-IR measurements. The lanthanides (Ln) are mainly present in the form of LnPO 4 monazite phases.
研究领域:
材料科学
·
核废料管理
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yuanyuan Hu,Dangli Gao,Xiangyu Zhang,Sining Yun
Persistent luminescence (PersL) that carries remote information is of paramount importance for intelligent anti-counterfeiting applications. However, the feeble PersL intensity, along with its uncontrollability, hamstrings their practical utilization. Here we develop LiNbO 3 (LNO):Pr,Bi phosphor with enhanced red PersL by trace doping of Sm 3+ . The LNO:Pr,Bi,Sm phosphor exhibits quadruplet luminescence, namely polychrome photoluminescence, PersL, and photo/thermo-stimulated luminescence (PSL/TSL). Particularly, the enhanced TSL can carry remote subjective information independent of the phosphor itself by controlling the temperature. A mechanism of PersL enhancement is proposed based on constructing reversible photovoltaic cells and electrolytic cells by photothermal redox reactions using Bi 3+ + V O and Bi 3+ /Pr 3+ + V Li ' ion pair. This study has initiated the exploration of designing information storage PersL materials for more sophisticated remote intelligent anti-counterfeiting.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Ruiying Zhai,Yijie Yang,Peilin Lei,Jiahao Lu,Sisi Chen,Xiaoqi Sun
In this article, a green pigment Bi 1.95-x Pr x W 0.05 MoO 6+δ (x = 0.1–0.5) co-doped with Pr and W was developed using high temperature solid-phase synthesis method. The microstructure, color performance, and optical characteristics of the novel pigment was analyzed using x-ray diffraction instrument (XRD), field-emission scanning electron microscopy (FESEM), L∗ a∗ b∗ color date, and ultraviolet–visible–near infrared light spectrophotometer. The results indicate that all the samples possess a monoclinic structure, characterized by the space group P21/c(14). Compared to Bi 2-x Pr x MoO 6+δ doped solely with Pr 6 O 11 , the Pr/W co-doped Bi 2 MoO 6 pigment demonstrates superior green coloration. The solar reflectance in the near-infrared region of all pigment samples exceeds 80 %, highest value reaches 92.82 %. In thermal insulation tests, the temperature difference between the Bi 1.95-x Pr x W 0.05 MoO 6+δ pigment coating and a blank galvanized sheet reaches up to 10.3 °C after 60 min under infrared lamp irradiation. The color difference Δ E∗ of the pigment powder after immersion in acid and alkali solution and high-temperature calcination are less than 5, indicating good chemical stabilities in acidic, alkaline and high-temperature environments. To our knowledge, Bi 1.95-x Pr x W 0.05 MoO 6+δ has the highest reflectivity among green pigments without toxic metals.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Haoxin Lin,Lin Tian,Xiaoyan Liu,Guocheng Wang,Chongchong Xie,Guohua Li,Chao Tian
In order to improve the comprehensive utilization rate of magnesite flotation tailings and solve its accumulation pollution problem. In this work, Mg 2 SiO 4 -MgO refractories were prepared by solid-phase method using magnesite flotation tailings as raw material and Pr 6 O 11 as additive. The adjustment mechanism of Pr 6 O 11 on the intergranular binding phase of Mg 2 SiO 4 -MgO refractories was investigated and the optimal addition amount of Pr 6 O 11 was determined through thermodynamic calculations, DSC test, phase composition test, microstructure observations and physical property tests. The results show that when Pr 6 O 11 is not added, the intergranular binding phase of Mg 2 SiO 4 -MgO refractories is CaO·MgO·SiO 2 . After Pr 6 O 11 is added, Pr 6 O 11 takes advantage of its high reactivity to extract SiO 2 and CaO from the MgO-SiO 2 -CaO system, which is supposed to synthesize CaO·MgO·SiO 2 , and reacts to produce Ca 2 Pr 8 (SiO 4 ) 6 O 2 , which consumes the reactants for synthesizing CaO·MgO·SiO 2 , thus inhibiting the production of CaO·MgO·SiO 2 . Thereby adjust the refractories intergranular binding phase from low melting point CaO·MgO·SiO 2 (melting point:1498°C) to high melting point Ca 2 Pr 8 (SiO 4 ) 6 O 2 (melting point:1780°C), which resulted in the improvement of the refractories's high temperature resistance and thermal shock resistance. At the same time, Pr 6 O 11 can form solid solution with Mg 2 SiO 4 and MgO to promote the sintering densification of the refractories, and the overall performance of the refractories is optimal when the addition amount of Pr 6 O 11 is 2wt%.
研究领域:
材料科学
·
无机非金属材料
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Qingjun Zhou,Yuhan Gong,Xinyue Zhang,Zilun Xia
A series of cathode materials of Pr 2-x Sr x NiO 4 (x = 0, 0.3, 0.5, 0.7, 1, 1.5) are synthesized by the EDTA-citric acid route. The results show that the Pr 1.7 Sr 0.3 NiO 4 , Pr 1.5 Sr 0.5 NiO 4 , Pr 1.3 Sr 0.7 NiO 4 and PrSrNiO 4 exhibit excellent structural stability and carbon dioxide resistance, and also exhibit good chemical compatibility and thermal matching with the SDC electrolyte. It is also found that the Sr doping is beneficial in improving the high temperature conductivity of Pr 2-x Sr x NiO 4 . At 800 °C, the electrical conductivity of Pr 1.5 Sr 0.5 NiO 4 and Pr 1.3 Sr 0.7 NiO 4 reaches 185 S cm −1 and 317 S cm −1 , respectively. In addition, the area-specific resistance (ASR) value increases significantly with Sr doping, which reduces the catalytic activity of the material. Acceptable ASR values are obtained for Pr 1.5 Sr 0.5 NiO 4 and Pr 1.3 Sr 0.7 NiO 4 , with ASR values of 0.079 Ω cm 2 and 0.082 Ω cm 2 at 800 °C, respectively. Additionally, the most interesting result is the ASR value obtained after high-temperature thermal decomposition of Pr 2 NiO 4 , where Pr 2 NiO 4 * (decomposed) has the lowest ASR value of only 0.027 Ω cm 2 at 800 °C, showing the best catalytic activity. The maximum power densities of Pr 2-x Sr x NiO 4 (x = 0.5 and 0.7) and Pr 2 NiO 4 * are found to be 515, 430, and 548 mW cm −2 at 800 °C, respectively. These results show that when the Sr doping amount is less than 1.5, the stability of the Pr 2-x Sr x NiO 4 cathode material can be effectively improved, but its catalytic performance is partially sacrificed.
研究领域:
材料科学
·
能源科学
✓ 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）