ACS Applied Nano Materials
·
2024
·
IF 5.3
Guoshu Deng,Guangze Nie,Xuehui He,Lin Li,Zhenkun Sun,Lunbo Duan
Conversion of CO2 into value-added chemicals is regarded as an effective way to reduce carbon emissions and improve the carbon recycling economy. In the process of hydrogenation of CO2 to CH4, nickel (Ni) has been extensively investigated due to its promising activity and easy availability. However, the inferior performance at low temperatures of Ni-based catalysts and the tendency of sintering at high temperatures lead to a rapid decline in activity, which hinders their large-scale applications. In this study, mesoporous silicas with highly ordered mesoporous structures but different pore symmetries and textural properties have been investigated as supports to synthesize Ni-based catalysts modified by La2O3. The effect of mesoporous symmetries and textural properties of the silica support on catalytic performance has been reasonably revealed. The catalysts supported on optimized silica with bicontinuous three-dimensional cubic pore symmetry exhibit considerably enhanced activity and stability in long-term CO2 methanation, which is attributed to the high dispersion of metal particles and the better mass transfer performance of interconnected mesopores in the silica support.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2022
·
IF 4.632
Feng Lin,Yudan Zhong,Yulong Ma,Yonggang Sun,Xiuqin Men,Yingbo Zhu
Hydrodeoxygenation (HDO) of renewable lignin-derived biomass in aqueous-phase to produce high value-added products is of great significance. However, developing new catalysts with high activity and excellent stability in an aqueous phase faces considerable challenges. Rare earth doping can effectively regulate the water exchange rate constant (WERC) value of the catalyst and play an important role in promoting the hydrolysis of ether bonds. Therefore, in this paper the bimetallic supported catalyst Ni–La 2 O 3 /H-ZSM-5 doped with rare earth metal La 2 O 3 was prepared, and used to catalyze the conversion of the lignin model compound guaiacol to cyclohexanol in the aqueous phase. The conversion of guaiacol catalyzed by 10Ni–3La 2 O 3 /H-ZSM-5 reaches 100%, and the selectivity of the product cyclohexanol is 85%. A series of characterizations illustrate that the doping of La 2 O 3 causes the electron transfer between La 2 O 3 –Ni and changes the distribution of Ni, and a strong metal carrier interaction occurs between the bimetallic Ni–La 2 O 3 and H-ZSM-5. This can effectively promote the hydrolysis of the C–O ether bond in guaiacol and significantly improve the activity of the catalyst. The possible catalytic reaction mechanism of Ni–La 2 O 3 /H-ZSM-5 catalytic conversion of guaiacol was proposed.
研究领域:
催化化学
·
生物质转化
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 45
·2205121
·
IF 19.924
Lixuan Zhang,Kai Wang,Yanqi Jia,Liping Fang,Chen Han,Jiaquan Li,Zongping Shao,Xinyong Li,Jieshan Qiu,Shaomin Liu
Piezoelectric polarization portrays a promising technology to regulate the photogenerated charge carrier separation and transfer behaviors, and the design of multifunctional catalysts with piezo-phototronic effect is a key step. One strategy is to prepare a composite catalyst combining the ideal properties from each individual component. Herein, a facial dopant-induced self-assembling strategy is reported to fabricate an ultracompact nanocomposite (LaFeO 3 /ZnFe 2 O 4 /La 2 O 3 ) with enhanced efficiency for piezo-photocatalysis. The composite is synthesized at 800 °C from the one-pot method, thus the self-constructed interface is created during multi-phase formation, providing the intimate grain-to-grain contact between the semiconductive LaFeO 3 and piezoelectric ZnFe 2 O 4 /La 2 O 3 phases. In such a composite, a synergistic effect for oxygen activation is realized via the effective manipulation of the photogenerated charge carrier separation and spatial transportation through the vibration-created piezopotential. A high piezoelectric coefficient (d 33 ) up to 826 pm V −1 and a superior H 2 O 2 yield of 403 µmol g −1 h −1 (in open air and pure water) are achieved on the optimized composite, outperforming most of the reported lead-free piezo-photocatalyst. The ultracompact composite is very robust without any decay in H 2 O 2 -delivering capability after many cyclic tests. This study provides a universal strategy for the rational design of high-performance piezo-photocatalysts.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Yi Chang,Zipeng Wei,Xiang Chang,Guanglei Ma,Lili Meng,Tingting Liu,Lin Yang,Yuming Guo,Xiaoming Ma
Multi-shelled nanomaterials , especially with hierarchically porous structures, are very promising for a variety of potential applications. Herein, the multi-shelled hollow La 2 O 3 nanospheres (MHLN) with high specific surface areas and numerous active sites are first fabricated via a facile and universal synthetic strategy characterized by step-by-step thermal removal of templates. The shell numbers can be easily controlled by adjusting the precursor amount adsorbed into the template. The formation mechanism of the MHLN reveals that the hierarchical assembly of the La 2 O 3 nanoparticles generates the smaller mesoporous of the shells, which providing a complicated but ordered three dimensional network for the MHLN. Notably, the combination of the multi-shelled hollow structure and the special hierarchical pores endows La 2 O 3 nanospheres not only with a large specific surface area but also with good porosity and permeability. Further functional investigation shows that MHLN exhibit a higher removal capacity (192.68 mg P g −1 ) for phosphate than the reported previously, a fast sorption and exhibit a good stability in wide pH range and excellent reusability.
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
RARE METALS
·
2023
·Vol. 43
·期 2
·658-670
·
IF 8.8
Peng Jia-Qi,Wei Yuan-Yuan,Liu Dong-Ming,Li Yun,Hu Bin,Huang Bin,Yang Jian-Wen,Xiao Shun-Hua,Wang Ren-Heng
Ultra-high nickel layered oxide cathode material with high energy density is the most promising material to improve the electrochemical performance of lithium-ion batteries (LIBs). However, the poor structural stability and severe surface/interface side reactions of the material lead to poor rate performance and cyclic stability, which limits its application in practice. In this paper, the dual-modification strategy of Co doping and La 2 O 3 coating is used to meet the above challenges. Co doping can effectively widen layer spacing and reduce Li + /Ni 2+ mixing, and La 2 O 3 coating can effectively eliminate the residual alkali on the surface of active material, inhibit the thickening of cathode electrolyte interphase (CEI) film and reduce surface/interface side reactions. Therefore, the modified material (NM90-CL) with excellent electrochemical properties is achieved through the synergistic enhancement of Co doping and La 2 O 3 coating. Its capacity retention rate can reach 77.9% after 200 cycles at 1.0 °C and 75.7% after 200 cycles at 5.0 °C. Its reversible capacity can up to 153.5 mAh·g –1 at 10.0 °C. This dual-modification strategy will provide theoretical guidance and technical support for the synthesis of other high-performance electrode materials. Graphical abstract
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2014
·
IF 5.211
Song-Il O,Jun-Min Yan,Hong-Li Wang,Zhi-Li Wang,Qing Jiang
Ni/La 2 O 3 nanocatalyst with Pt and Rh content as low as 5 mol%, respectively, is successfully synthesized by a facile co-reduction method in the presence of hexadecyl trimethyl ammonium chloride aqueous solution under ambient atmosphere. Interestingly, the resulted Ni/La 2 O 3 catalyst with low cost exhibits excellent catalytic activity to dehydrogenation of hydrous hydrazine (N 2 H 4 ·H 2 O), producing hydrogen with 100% selectivity at room temperature (298 K), which represents a promising step toward the practical application for N 2 H 4 ·H 2 O system on fuel cells.
研究领域:
催化化学
·
能源材料科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 12
·126586
·
IF 1.449
Zhuangzhi Wu,Xin Liu,Dezhi Wang
A traditional preparation process of Mo powder is generally time-consuming and leads to coarse particles. In this work, we propose a short-flow strategy, in which the intermediate product of MoO2 is prepared by a one-step self-reduction method in air instead of a mixture of decomposition and hydrogen reduction processes. And the reaction mechanism of self-reduction is investigated and the consequent sintering performance of Mo powder is also compared with the traditional one. The obtained results demonstrate that the finally synthesized Mo–La2O3 powder prepared by the self-reduction strategy are spherical with an average particle size of 2.03 μm, exhibiting an excellent sintering performance with a relative density of 95.3% and a hardness of 260.6 (HV), better than those by a traditional one (93.4% and 232.4 (HV)), which can be attributed to smaller particle size and better shapes. This work provides a new route for the synthesis of Mo–La2O3 powder, indicating a possible industrial application.
研究领域:
材料科学
·
冶金工程
✓ 已验证
DOI
高影响因子
Catalysts
·
2023
·Vol. 13
·期 2
·298
·
IF 3.9
Haoting Yan,Yongwang Ren,Renkun Zhang,Feixiang Chang,Qinhong Wei,Jing Xu
It is a challenging task for selective hydrogenation of cinnamaldehyde (CAL) to hydrocinnamaldehyde (HCAL) without additional by-product formation. In this work, a La2O3supported high Ni content nanoparticle catalyst was prepared for CAL selective hydrogenation. Meanwhile, Co-La2O3catalysts were used as a reference catalyst. XRD, TEM, STEM-HAADF, XPS, and H2-TPR measurements were used to investigate the physicochemical properties of Ni-La2O3catalysts. The experimental results confirmed that the CAL conversion and HCAL selectivity were effectively promoted with the increase of Ni loading amounts. At a Ni/La molar ratio of four, a high HCAL selectivity of 87.4% was obtained at a CAL conversion of 88.1% under mild reaction conditions. The catalyst was recycled five times without activity loss. Combined with various characterizations, it could be inferred that the good hydrogen adsorption and dissociation capacity of Ni and the presence of a certain amount of oxygen vacancies on the La2O3support have a positive effect on the improvement of HCAL selectivity. This work provided an effective path to design transition-metal-based supported oxide catalyst for the cinnamaldehyde hydrogenation to hydrocinnamaldehyde.
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
ACS Combinatorial Science
·
2016
·
IF 3.317
Zhinian Li,Lei He,Shenliang Wang,Wuzhong Yi,Shihui Zou,Liping Xiao,Jie Fan
The development of efficient catalyst for oxidative coupling of methane (OCM) reaction represents a grand challenge in direct conversion of methane into other useful products. Here, we reported that a newly developed combinatorial approach can be used for ultrafast optimization of La2O3-based multicomponent metal oxide catalysts in OCM reaction. This new approach integrated inkjet printing assisted synthesis (IJP-A) with multidimensional group testing strategy (m-GT) tactfully takes the place of conventionally high-throughput synthesis-and-screen experiment. Just within a week, 2048 formulated LiMgMnOx-La2O3 catalysts in a 64·8·8·8·8 = 262 144 compositional space were fabricated by IJP-A in a four-round synthesis-and-screen process, and an optimized formulation has been successfully identified through only 4·8 = 32 times of tests via m-GT screening strategy. The screening process identifies the most promising ternary composition region is Li0–0.48Mg0–6.54Mn0–0.62-La100Ox with an external C2 yield of 10.87% at 700 °C. The yield of C2 is two times as high as the pure nano-La2O3. The good performance of the optimized catalyst formulation has been validated by the manual preparation, which further prove the effectiveness of the new combinatorial methodology in fast discovery of heterogeneous catalyst.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2021
·Vol. 23
·期 10
·1-9
·
IF 2.253
Fan Lidan,Yu Liwei,Xu Feng,Qin Gang,Chen Qiang
Solid polymer electrolytes have promising applications in a wide variety of fields compared with liquid electrolytes; however, the promotion of ionic conductivity is still necessary and the composition with nanoparticles is an effective way. In this paper, the composite alkaline solid polymer electrolyte membrane is prepared from poly (vinyl alcohol) (PVA) and lanthanide oxide (La 2 O 3 ) nanoparticle via solution casting method. The addition of La 2 O 3 nanoparticle can hinder the crystallization of PVA, so as to obviously improve the ionic conductivity to 0.086 S·cm −1 with the content of 12 wt.%. Moreover, a three dimension of multi-porous structure is observed by SEM and abundant KOH electrolyte can be retained. Besides, an electrochemical stability window of 1.6 V is obtained. The conductivity is influenced by the temperature and the ratio between KOH and PVA, remarkably. In addition, nickel metal hydride battery is assembled with the discharge capacity of about 230 mAh·g −1 , indicating that the PVA-La 2 O 3 -KOH ASPE is viable for utilization in Ni-MH battery. Graphical abstract
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2018
·Vol. 32
·期 3
·e4208
·
IF 3.581
Yan Gao,Jiasheng Fang,Yiwei Zhang,Chao Zhang,Shuo Zhao,Yuming Zhou,Mengqiu Huang,Xiaoli Sheng
A facile strategy is reported for the fabrication of Pt-loaded core–shell nanocomposite ellipsoids (Fe 2 O 3 -Pt@DSL) consisting of ellipsoidal Fe 2 O 3 cores, double-layered La 2 O 3 shells and deposited Pt nanoparticles (NPs). The formation of the doubled-shelled structure uses Fe 2 O 3 -Pt@mSiO 2 as template sacrificial agent and it involves the re-deposition of silica and self-assembly of metal oxide units. The preparation methods of double-shelled metal oxides avoid repeated coating and etching and could be utilized to fabricate other shaped double-shelled composites. Characterization results indicated that the Fe 2 O 3 -Pt@DSL nanocomposites possessed mesoporous structure and tunable shell thickness. Moreover, due to the formation of Fe 2 O 3 and La 2 O 3 composites, Pt NPs can also be stabilized via deposition on chemically active oxides with a synergistic effect. Therefore, as a catalyst for the reduction of 4-nitrophenol, Fe 2 O 3 -Pt@DSL showed superior catalytic activity and reusability due to structural superiority and enhanced composite synergy. Finally, well-dispersed Pt NPs were encapsulated into the void between the shell layers to construct the Fe 2 O 3 -Pt@DSL-Pt catalyst.
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Shouzhen Li,Xiaota Cheng,Guangting Han,Yang Si,Yitao Liu,Jianyong Yu,Bin Ding
Developing ceramic nanofibrous membranes for the thermal insulation layer of firefighting protective clothing is vital. However, previous ceramic nanofibrous membranes were brittle and easy to break during service in high-temperature environments. The lack of elastic and compressible properties has limited the high-end applications of ceramic nanofibrous membranes. In this work, elastic and compressible Al 2 O 3 /ZrO 2 /La 2 O 3 nanofibrous membranes were fabricated via sol–gel electrospinning and calcination in air at different temperatures. The as-fabricated Al 2 O 3 /ZrO 2 /La 2 O 3 nanofibrous membranes can maintain excellent elasticity and compressibility in the temperature ranging from −196 to 1400 °C. Moreover, they have low thermal conductivity and high working temperatures. These favorable characteristics make the Al 2 O 3 /ZrO 2 /La 2 O 3 nanofibrous membranes a promising candidate for the thermal insulation layer of firefighting protective clothing.
研究领域:
材料科学
·
纳米技术
·
防火工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）