CHINESE JOURNAL OF CHEMISTRY
·
2016
·Vol. 35
·期 5
·651-658
·
IF 1.872
Hao Tian,Xinyu Li,Sai Chen,Liang Zeng,Jinlong Gong
Reducible oxides ( e.g ., CeO 2 and ZrO 2 ) supported 3d transition metals ( e.g ., Ni, Co, Pt) exhibit remarkable catalytic activity in reactions that involve water activation, such as steam reforming and water gas shift. This paper describes the influence of Sn addition on the performance of Ni/CeO 2 catalysts in ethanol steam reforming. 0.25 wt% Sn addition improved the stability of Ni/CeO 2 by forming Ni-Sn bimetallic nanoparticles with Sn enriched surfaces to suppress the carbon deposition. Ni 0. 25 Sn/CeO 2 kept over 90% ethanol conversion in a 20 h stability test at 600 °C with over 60% hydrogen selectivity under a gas hourly space velocity of 57000 mL/(g•h). However, the presence of Sn decreased the overall oxygen storage capacity and oxygen mobility of NiSn/CeO 2 , which hampered water activation process and coke elimination occurring at the interface between Ni and CeO 2 . Additionally, ethanol decomposition was also suppressed due to the coverage of Sn atoms on Ni surfaces.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Progress in Natural Science-Materials International
·
2017
·
IF 2.038
Hongbin Dai,Yujie Zhong,Ping Wang
The synthesis of highly active and selective catalysts is the central issue in the development of hydrous hydrazine (N 2 H 4 ·H 2 O) as a viable hydrogen carrier. Herein, we report the synthesis of bimetallic Ni-Ir nanocatalyts supported on CeO 2 using a one-pot coprecipitation method. A combination of XRD, HRTEM and XPS analyses indicate that the Ni-Ir/CeO 2 catalyst is composed of tiny Ni-Ir alloy nanoparticles with an average size of around 4 nm and crystalline CeO 2 matrix. The Ni-Ir/CeO 2 catalyst exhibits high catalytic activity and excellent selectivity towards hydrogen generation from N 2 H 4 ·H 2 O at mild temperatures. Furthermore, in contrast to previously reported Ni-Pt catalysts, the Ni-Ir/CeO 2 catalyst shows an alleviated requirement on alkali promoter to achieve its optimal catalytic performance.
研究领域:
催化化学
·
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of CO2 Utilization
·
2021
·
IF 7.132
Ziyi Zhao,Xiaotong Li,Jianghao Wang,Xiangzhou Lv,Hao Bin Wu
Electrochemical reduction of carbon dioxide to value-added fuels offers a promising method to solve increasingly serious environmental problems and alleviate energy crisis. Herein, we report a facile method by coating Cu electrode with CeO 2 nanoparticles to largely enhance the C 2+ products selectivity during CO 2 electroreduction. The Faradaic efficiency of C 2+ products for optimal CeO 2 -coated Cu electrode reached a high value of 61 % at -1.05 V vs RHE, and exhibited good stability for over 9 h of CO 2 electrolysis. The CeO 2 nanoparticles were found to induce oxidative corrosion of the Cu foil, leading to a CuO x layer in contact with the CeO 2 nanoparticles. The interface between CeO 2 nanoparticles and oxide-derived Cu might be attributed to the enhanced catalytic activity for C 2+ products by promoting the C C coupling process.
研究领域:
化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Lingxuan Meng,Lingye Zhang,Suyi Liu,Feng Wang,Huimin Wu
Pollution-free and low-cost bifunctional catalysts are important part for hydrogen production . In this paper, composite catalysts Ni 0.2 Mo 0.8 N/CeO 2 -x/NF (x = n(Ce)/n(Ni)- 0.1, 0.3, 0.5) were synthesized via hydrothermal and calcination methods on foam nickel (NF). Experimental results show that the composites have better properties than CeO 2 /NF, Ni 0.2 Mo 0.8 N/NF and MoN/CeO 2 /NF. The electrochemical properties of the composites depend on the ratio of nickel and cerium . A proper proportion of nickel leads to a larger specific surface area, increased electron capacity, more active sites, and better overall performance. Among the tested composites, Ni 0.2 Mo 0.8 N/CeO 2 -0.3/NF exhibits the best electrochemical performance and is well-suited for catalyzing the hydrogen evolution reaction (HER) and urea oxidation reaction (UOR). For HER, the potential is −120 mV @ 100 mA cm −2 . And for UOR, the UOR potential is only 1.462 V @ 100 mA cm −2 . A two-electrode electrolyzer of Ni 0.2 Mo 0.8 N/CeO 2 -0.3/NF|| Ni 0.2 Mo 0.8 N/CeO 2 -0.3/NF was also built. Overall urea splitting (OUS) is 1.672 V @ 100 mA cm −2 , which is 187 mV smaller than overall water splitting (OWS, 1.859 V). Therefore, Ni 0.2 Mo 0.8 N/CeO 2 has potential application in hydrogen production from urea-rich wastewater electrolysis.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Changming Zhang,Rongxian Wang,Xiaochao Zhang,Zhiyan Dong,Wensheng Wu,Jinbo Xue,Caimei Fan
The efficient capture of CO 2 molecules is a crucial step in the light-driven CO 2 synthesis of high value-added products. In this work, CeO 2 is embedded in polyacrylonitrile-based carbon spheres (PANACSs) via a suspension polymerization and carbonization method to synthesise CeO 2 @PANACSs with bifunction (CO 2 adsorption and reduction ablity), and the strong oxidising capacity Bi 2 Fe 4 O 9 was coupled to obtain ternary Bi 2 Fe 4 O 9 /CeO 2 @PANACSs composites with high adsorption-reduction capacity for CO 2 . The effective synergistic effects between Bi 2 Fe 4 O 9 and CeO 2 @PANACSs realize that the CO yield of ternary hybrid photocatalyst can reach as high as 256.1 μmol g −1 for 10 h, approximately 19.55 times, 1.45 times and 1.62 times higher than that of pristine PANACSs, Bi 2 Fe 4 O 9 and CeO 2 , respectively. The exceptional performance of Bi 2 Fe 4 O 9 /CeO 2 @PANACSs composites is mainly attributed to the synergistic effect of the ternary system, which not only provides CO 2 -rich adsorption-reduction active sites but also effectively inhibits photogenerated electron-hole complexation. Meanwhile, the outer layer of Bi 2 Fe 4 O 9 with its excellent oxidising capacity also provides a large amount of H* to ensure efficient hydrodeoxygenation of CO 2 . Finally, combined with the results of in situ fourier transform infrared spectra, a possible mechanism for the photocatalytic reduction of CO 2 over ternary photocatalysts is proposed. Our finding provides a noteworthy promising strategy to construct bifunctional composite photocatalysts for achieving the high-efficient CO 2 adsorption and photoreduction to CO.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Yan Fan,Bo Hou,Fang Lu,Dao Liu,Xiang Cui
A novel “turn-on” fluorescent sensor of CeO 2 @MIL-88B was constructed successfully via the facile in-situ strategy. The as-obtained CeO 2 @MIL-88B could be used for effectively detecting the analyte of thiabendazole (TBZ) by luminescence enhancement, which limit of detection (LOD) was as low as 0.294 μM (nearly 10.4 times smaller than that of MIL-88B). The detection behavior for TBZ exhibited the excellent selectivity and anti-interference ability. Systematic explorations were performed to shed light on the underlying mechanism of “turn-on” effect on fluorescence after adding TBZ. Moreover, the CeO 2 @MIL-88B was also employed for the determination of TBZ in the real samples of orange and cucumber.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Shanshan Shao,Xianliang Xiang,Xiaohua Li,Huiyan Zhang,Rui Xiao,Yixi Cai
Acetic acid, n-butyraldehyde, furfural, n-butanol, and ethyl acetate as model compounds of biomass pyrolysis vapors were selected as reactants for ketonization over CeO2. Catalytic conversion of single components was conducted to understand their ketonization characteristics and also to obtain the overlapped temperature range. The results showed that the yield of acetone from directional ketonization of acetic acid reached a maximum of 97.4% at 360 °C over CeO2 with numerous oxygen vacancies, while n-butyraldehyde, n-butanol, and ethyl acetate performed the best at 420 °C with limited yield of ketones of 47.2, 35.1, and 85.4%, respectively. At the overlapped 420 °C, owing to the dehydration of acetic acid molecules, the ketonization of n-butyraldehyde was promoted with the largest overall yield of ketones of 96.5%. A mixture of furfural/acetic acid (1:4) brought about a lower yield of ketones of 78.8%, indicating a negative synergism due to active sites occupation by furfural adsorption.
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
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Lin Lyu,Quan Xie,Yinye Yang,Rongrong Wang,Weifu Cen,Shengyun Luo,Wensheng Yang,Yue Gao,Qingquan Xiao,Ping Zou,Yang Yang
Acetone is flammable and harmful to human health and environment. It is urgent and significant to develop high sensitivity and efficiency sensors for acetone gas detecting. Herein, a novel nanoscale hollow–shell structure of CeO 2 with high stability, sensitivity and selectivity for acetone gas detecting was designed. The as-developed nanoscale hollow–shell CeO 2 sensor presents 270% sensing response, and the corresponding response and recovery are 6 s and 11 s when detecting 100 ppm acetone gas at 260 ℃. Remarkably, this sensor exhibits excellent stability in continual detection of 100 ppm acetone gas in 60 days. Furthermore, the developed nanoscale hollow–shell CeO 2 sensor presents an outstanding selectivity to acetone gas among ethanol, methanol, xylene, ammonia, formaldehyde and ethylene glycol gases. DFT further reveals that there are 0.66 electrons of acetone molecule transferred to CeO 2 , which will decease CeO 2 band gap from 2.74 eV to 1.91 eV, and consequently the conductivity enhanced after absorbing acetone gas. This developed CeO 2 nanoscale hollow–shell sensor can be used as matrix sensor material for VOCs detection.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
WEAR
·
2021
·
IF 3.892
Shifan Li,Conglin Dong,Chengqing Yuan,Shutian Liu,Xiuqin Bai
The water-lubricated polymer stern tube bearing is a key-component which has great influences on operational reliability and safety of marine power systems . The poor thermal conductivity and frictional heat generated by friction easily cause severe deforming behaviours on the polymer bearing contacting surfaces, and lead to the high coefficient of friction as well as fluctuations. Therefore, for figuring out the tribological properties of polymer matrix composites after being modified by nano-fillers and conducted aging treatments, an array of high density polyethylene (HDPE) composites composed with CeO 2 were manufactured and tested on a commercial tribo-tester. The results showed that the CeO 2 nano-particles had a significant effect on the anti-aging property of HDPE and affected its tribology properties. Compared with the pure HDPE, CeO 2 nano-particles could reduce the COF after aging, and the COF reduction rate reached maximum to 46.6% after aging for 25 d. The CeO 2 nano-particles reduced the internal molecular chain fractures of the modified polymer under aging conditions, and slowed down the descending trends of the typical physical properties of polymer. The tribology properties of the modified polymer were enhanced by CeO 2 nano-particles compared with the pure HDPE, and the reinforcement model was disclosed in the end. The knowledge gained herein will be useful for designing a new water lubricated bearing polymer with good anti-aging property for extending its applications under extreme circumstances.
研究领域:
材料科学
·
海洋工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Yuanyuan Zhang,Ruyi Xiao,Shuangfei Wang,Hongxiang Zhu,Hainong Song,Guoning Chen,Hongfei Lin,Jian Zhang,Jianhua Xiong
To develop an efficient heterogeneous Fenton-like catalyst is of great importance for degrading organic pollutants. CeO 2 was selected as the catalyst carrier. Prussian blue (PB) was chose as the iron resource for its sensitivity to H 2 O 2 and low toxicity. PB modified CeO 2 composite was successfully fabricated and used for Fenton-like oxidation of norfloxacin (NOR) in this study. The characteristics of the catalysts demonstrated that the doping of PB distorted the lattice locally and increased the surface area of CeO 2 obviously. The XPS analysis also indicated that chemically supported catalysts PB/CeO 2 with more Ce 3+ was beneficial to Fenton-like catalytic reaction. The degradation tests showed that the PB/CeO 2 significantly enhanced the removal of NOR which indicated a synergistic effect between PB and CeO 2 . The reason should be mainly attributed to the synergetic catalysis of H 2 O 2 by Fe 3+ /Fe 2+ and Ce 3+ /Ce 4+ redox couples. At the same time, PB/CeO 2 composite showed well reusability and wide pH value range of 2–9 with fairly low concentration of iron ions. The reaction mechanisms were identified to be OH oxidation and improvement of oxygen vacancies (OVs).
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Applied Sciences-Basel
·
2024
·Vol. 14
·期 18
·8285
·
IF 2.5
Yihang Liu,Zongmao Lu,Jiajie Wang,Jinghui Lai,Ziyang Li,Chu Zhang,Yuhang Qi
Cu interconnect chemical mechanical polishing (CMP) technology has been continuously evolving, leading to increasingly stringent post-CMP cleaning requirements. To address the environmental pollution caused by traditional post-CMP cleaning solutions, we have explored the use of photocatalytic processes to remove citric acid, which is a commonly used complexing agent for CMP. In this study, CeO2abrasives, characterized by a hardness of 5.5, are extensively employed in CMP. Importantly, CeO2also exhibits a suitable band structure with a band gap of 2.27 eV, enabling it to photocatalytically remove citric acid, a commonly used complexing agent in Cu CMP. Additionally, the integration of H2O2, an essential oxidant in Cu CMP, enhances the photocatalytic degradation efficiency. The research indicates that the removal rate of single-phase CeO2was 1.78 mmol/g/h and the degradation efficiency increased by 40% with the addition of H2O2, attributed to the hydroxyl radicals generated from a Fenton-like reaction between H2O2and CeO2. These findings highlight the potential of photocatalytic processes to improve organic contaminant removal in post-CMP cleaning, offering a more sustainable alternative to conventional practices.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 24
·30243-30253
·
IF 3.056
Xu Wenqing,Gao Lei,Yang Yang,Zhu Tingyu,Qi Guisheng
The deposition of NH 4 HSO 4 on catalysts is one of the key issues for selective catalytic reduction of NO x . In this study, NH 4 HSO 4 was preloaded on catalysts, and the effects of MoO 3 and CeO 2 doping on the decomposition and reactivity of NH 4 HSO 4 on V 2 O 5 /TiO 2 catalysts are studied. The results show that the introduction of MoO 3 and CeO 2 significantly promoted NO x conversion on the V 2 O 5 /TiO 2 catalysts. Doping with MoO 3 could effectively enhance the S and H 2 O resistance of the catalysts. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) analysis indicate that it is the strong chemical interactions between NH 4 HSO 4 and the catalysts that are adverse to the decomposition of NH 4 HSO 4 . However, doping with MoO 3 apparently inhibits these interactions, which significantly decrease the decomposition temperature of NH 4 HSO 4 . In situ FTIR experiments show that the NH 4 + in preloaded NH 4 HSO 4 could react with gaseous NO on catalysts, and doping with MoO 3 could facilitate the reaction rate.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）