Reaction Kinetics Mechanisms and Catalysis
·
2017
·Vol. 122
·期 1
·525-538
·
IF 1.264
Li Xin,Meng Fanhui,Cheng Yang,Gao Yuan,Li Zhong
Mesoporous silica (SiO 2 ) supported highly dispersed Ni catalysts with ZrO 2 and surfactant β-cyclodextrin (CD) were prepared by the impregnation method, and their catalytic performance for three-phase methanation of CO were evaluated. It is shown that ZrO 2 promotes the dispersion of Ni species on mesoporous SiO 2 , leading to the increase in Ni dispersion and methanation activity. For the ZrO 2 content, the optimum is 5 wt%. Moreover, when adding CD in the preparation of Ni5Zr/SiO 2 catalyst, CD was found effectively enhanced the dispersion of Ni species and interaction between Ni species and support, leading to a smaller size of NiO particles and more exposed active surfaces, which promotes the CO adsorption capacity. As the molar ratio of CD/Ni rises, the crystallite size of metallic Ni decreased. Ni5Zr/SiO 2 (1:5) catalyst prepared with 5 wt% ZrO 2 and 1:5 molar ratio of CD/Ni shows the optimal catalytic activity for the three-phase CO methanation reaction. This is because of the highest dispersion of metallic Ni and smallest size of NiO particles.
研究领域:
化学工程
·
催化
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 52
·30439-30447
·
IF 3.049
Yongsheng Wang,Zhenzhen Zhao,Yunlu Zhao,Xiaolin Lan,Weixiang Xu,Li Chen,Dongjie Guo,Zhengkang Duan
The sintering resistance of supported Cu nanoparticle (NP) catalysts is crucial to their practical application in the dehydrogenation of diethanolamine (DEA). In this paper, co-precipitation, hydrothermal synthesis, and sol–gel condensation are used to form a new support material through chemical bonding between graphene oxide and ZrO2. The composite carriers prepared by the three methods are mixed with copper nitrate and ground using a ball mill. A series of Cu/ZrO2-reduced graphene oxide (RGO) composites were prepared by calcination under nitrogen at 450 °C for 3 h and hydrogen reduction at 250 °C for 4 h. The conversion of DEA to iminodiacetic acid (IDA) reached 96% with the Cu/ZrO2-RGO catalyst prepared by hydrothermal synthesis. The conversion rate of DEA is more than 80% following the reuse of the CZG-2 catalyst for twelve cycles. The various physicochemical characterization techniques show that the Cu/ZrO2-RGO layered and wrinkled nanostructures can improve catalytic stability and suppress the sintering of the supported Cu NPs during the catalytic dehydrogenation of diethanolamine. A synergistic effect between the RGO and the Cu nanoparticles is observed. The Cu nanoparticles with RGO have a better dispersibility, and a new nano-environment is created, which is the key to improving the efficiency of diethanolamine dehydrogenation. These new Cu/ZrO2-RGO catalysts show increased durability compared to commercially produced Cu/ZrO2 catalysts and show promise for practical applications involving diethanolamine dehydrogenation.
研究领域:
材料科学
·
化学工程
·
催化
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Yaoliang Huang,Yunru Zhang,Guizhi Yuan,Dingshan Ruan,Xinlong Zhang,Weijian Liu,Zhongshuai Zhang,Xiaoyuan Yu
Ni/Mn-based layered oxides have been widely studied for sodium ion battery cathode because of high capacity and simple preparation. However, its application has been restricted owing to unstable structure and poor cycling performance. Herein, the multi-element doped hexagonal sheet Ni/Mn-based layered oxide with ZrO 2 surface modification O3-NaNi 0.3 Mn 0.5-x Fe 0.1 Cu 0.1 Zr x O 2 @ZrO 2 (NFMCZ-x) cathode materials have been successfully synthesize by high temperature calcination method accompanied by ball milling activation. XRD refinement results show Zr 4+ substitution of Mn 3+ can increase interlayer distance of sodium layer. Benefiting from the synergetic effect of multi-element doping and ZrO 2 surface modification, the optimized NFMCZ-0.03 sample exhibits a higher discharge capacity of 178 mAh/g at 0.1C and good capacity retention (77 % after 50 cycles at 2C). Furthermore, NFMCZ-0.03 has an excellent air stability with a capacity retention rate of 86 % during 50 cycles at 1C after being exposed in the air for 20 days. The ex-situ XRD results of NMFC at different charge/discharge voltages show Zr 4+ doping can suppress O3 + P3′'–O3′-O3 + P3′' phase transition during charge/discharge process. These results confirm that synergistic effect of multi-doping combined with surface modification can improve electrochemical performance of layered oxides cathodes, which provides a research idea for development of Ni/Mn-based layered oxides cathodes for sodium-ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
固态化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Ming Yin,Li Zhang,Xiuxia Wei,Yiwei Sun,Shuyan Qi,Yan Chen,Xinxin Tian,Jingxuan Qiu,Dongpo Xu
This work is carried out by the synergy of Co/Ni-Bio-MOF and noble metal Au-doped coral-like ZrO 2 . A novel electrochemical aptamer sensor (aptasensor) for measuring kanamycin (Kan) was developed by using ZrO 2 @Au as an amplification platform for electrochemical aptasensors. ZrO 2 @Au was strategically used to significantly reduce the Differential Pulse Voltammetry (DPV) response by hindering electron transfer at the working electrode surface. When Kan is recognized by the ZrO 2 @Au-linked aptamer, it is disconnected from the complementary sequence attached to the Co/Ni-Bio-MOF due to the applied force, thereby disengaging from the electrode. This results in the removal of obstacles to electron transfer, enabling signal amplification. This electrochemical sensor exhibits good linearity from 10 μM to 1000 μM. It has a detection limit of 0.037 μM and has excellent stability (RSD = 0.14–0.21%), reproducibility (RSD = 0.079–0.63%) and selectivity.
研究领域:
分析化学
·
电化学
·
生物传感器
·
环境监测
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Nan Li,Hongju Qiu,Lei Gao,Zhipeng Xie,Yunlong He,Yan Jiang,Guo Chen
Herein, to alleviate the hard agglomeration of ZrO 2 nanoparticles (NPs) fabricated by the traditional sol-gel method (SGM), a novel sol-gel-flux method (SGFM) is applied to tailor ZrO 2 nanoparticles (NPs) stabilized by 5 mol% Y 2 O 3 (5Y–ZrO 2 ) by in situ introduction of NaCl NPs among xerogel particles. The phase composition, micromorphology, surface area, and sintering performances of 5Y–ZrO 2 products fabricated by SGM and SGFM are compared. The effects of calcination temperature on the phase composition, micromorphology, and particle size of 5Y–ZrO 2 products prepared by SGFM are systematically investigated. The results show that the 5Y–ZrO 2 particles prepared by SGM are severely agglomerated and irregular, while the 5Y–ZrO 2 NPs prepared by SGFM are well dispersed, uniformly distributed, and quasispherical. The former can hardly be densified by sintering, while the latter shows excellent sintering performance. By sintering 5Y–ZrO 2 NPs prepared by SGFM at 1200 °C for 3 h, 5Y-TZP with a high density and an average grain size of 0.29 μm is fabricated. The in situ generated NaCl particles effectively separate ZrO 2 particles during sintering. The calcination temperature plays a crucial role in controlling the phase composition, agglomeration degree, micromorphology, particle size distribution , and particle size of 5Y–ZrO 2 products synthesized by SGFM, and the optimal calcination temperature is suggested to be 790 °C.
研究领域:
材料科学
·
纳米技术
·
陶瓷
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Xing Yan,Dongren Cai,Meihong Lin,Zhijie Wu,Yegang Xia,Yanmei Cai,Sajid Ali,Kok Bing Tan,Andriambinintsoa Ranaivoson Tojonirina,Hao Sun,Guowu Zhan
The selective hydrogenation of CO 2 to methanol demands precise control of both catalyst architecture and reaction pathways. Here, we design an atomic layer deposition (ALD)-engineered Pd/ZnO/ZrO 2 ternary catalyst with atomic-scale ZnO interlayers to decouple and reconfigure active sites at dual interfaces (Pd-ZnO and ZnO-ZrO 2 ). This interfacial engineering drives a 7-fold enhancement in methanol space–time yield (0.584 vs. 0.084 g MeOH g cat −1 h −1 ) and switches the dominant reaction pathway from CO-mediated to formate-driven selectivity (methanol selectivity remarkably surges from 6 % to 64 %). Multimodal characterization and theoretical calculations reveal that ZnO interlayers orchestrate bifunctional cooperation: activating CO 2 /CO adsorption while suppressing CO/CH 4 formation through electronic effects. Long-term stability study uncovers a dynamic restructuring mechanism, where Pd-ZnO interfaces gradually evolve into PdZn β alloy phases under the reaction conditions. This work establishes ALD-mediated interface design as a generalizable strategy to manipulate reaction networks and methanol selectivity in catalytic CO 2 hydrogenation systems.
研究领域:
催化化学
·
材料科学
·
化学工程
·
可持续能源
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
Greenhouse Gases-Science and Technology
·
2022
·Vol. 12
·期 2
·305-320
·
IF 2.518
Zichen Liu,Shuman Xu,Jing Hao,Lina Song,Mingben Chong,Dang-Guo Cheng,Fengqiu Chen
The conversion of CO 2 into high-value chemicals has drawn a great deal of consideration, of which the most ideal product is lower olefins. However, the modified Fischer–Tropsch (F-T) synthesis with CO as an intermediate shows poor selectivity for lower olefins. Here, a list of bifunctional catalysts consisting of SAPO-34 zeolites with adjustable silicon contents and In 2 O 3 /ZrO 2 were synthesized. In the reaction process, CO 2 is first hydrogenated to methanol over an In 2 O 3 /ZrO 2 catalyst, and then the generated methanol rapidly diffuses to the adjacent zeolite catalyst to react to lower olefins. The selectivity of lower olefins (88.3%) and conversion rate of CO 2 (23.3%) was achieved over In 2 O 3 /ZrO 2 and SAPO-34-0.05 at 633 K, a gas hourly space velocity (GHSV) of 4500 ml·gcat –1 ·h –1 , and H 2 /CO 2 /Ar = 3:1:1. The catalytic performance remained stable after 50 h of reaction. Characterization analysis showed that Si content affected the content of Brønsted acid sites (BAS) and morphology of SAPO-34, resulting in different distribution of reaction intermediates. Tetramethyl-benzenes, as important intermediate species, had a slower conversion rate on the SAPO-34 with low Si content and nanosheet morphology, which led to high lower olefins selectivity. © 2022 Society of Chemical Industry and John Wiley & Sons, Ltd.
研究领域:
催化
·
化学工程
·
材料科学
·
环境化学
✓ 已验证
产品关联
DOI
高影响因子
Optical Materials Express
·
2015
·Vol. 5
·期 8
·1759-1771
·
IF 2.844
Jing Liu,Nana Li,Ruitao Wu,Yuxiang Zhao,Qiuqiang Zhan,Sailing He
Upconversion nanoparticles (UCNPs) is a class of promising probes
widely used in protein molecules imaging due to the no photobleaching
and non-blinking emission. However, it is still remained challenging
to synthesize a type of ultra-small but bright UCNPs. In this paper, a
new class of efficient sub-5-nm upconversion nanodots (UCNDs) was
elaborately designed and experimentally demonstrated. The proposed
uniform UCNDs comprise two parts: a 3.5-nm Ln3+-doped
ZrO2 core and 0.5-nm NaYF4 shell. The emission
intensity of the proposed UCNDs was measured to be more than 10 times
brighter than that of the conventional 10-nm NaYF4 UCNPs.
Under 300 kW·cm−2 irradiance excitation, the 15 mol%
Er3+-doped UCNDs exhibit an 18-fold enhanced intensity and
one fifth emission lifetime compared to the 0.5 mol%
Er3+-doped ones. Using the biocompatible UCNDs, the
aptamer-mediated proteins-targeted imaging was performed and
demonstrated high efficiency. These ultra-small, efficient UCNDs would
have great potentials in rapid scanning and cellular imaging.© 2015 Optical Society of
America
研究领域:
纳米技术
·
材料科学
·
生物医学工程
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jielin Huang,Jing Liu,Lina Tian,Xiangli Li,Xinqi Ma,Xin Yu,Quanhui Guo,Junwei Zhao
Broadband solar light absorption and visible light photocatalysis of surface modified ultrawide bandgap semiconductors are receiving wide attentions because of their more negative conduction band potential and positive valence band potential for refractory organics degradation. Here, we reported a novel modified solvothermal strategy by the introduction of distilled water into small molecular alcohols to synthesize crystallized carbon-coated Zr 3+ -ZrO 2 composites for enhanced visible light absorption and visible light photocatalytic tetracycline degradation, in which the distilled water favored for the crystallization of Zr 3+ -ZrO 2 and the formed ultrathin carbon layers derived from the polymerization of small molecular alcohols were contributing to the generation of Zr 3+ species and well dispersion of Zr 3+ self-doped ZrO 2 nanoparticles. The experimental results also showed that carbon-coated Zr 3+ -ZrO 2 composites exhibited enhanced visible light absorption, long-lived charges, efficient visible light photocatalytic performance and good recyclable stability. Besides, possible photocatalytic mechanism and antibiotic degradation pathways over carbon-coated Zr 3+ -ZrO 2 composites under visible light irradiation were also proposed in detail.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
E-POLYMERS
·
2016
·Vol. 17
·期 3
·243-248
·
IF 0.812
Weidong Han,Bin Ding,Mira Park,Fuhai Cui,Su-Hyeong Chae,Hak-Yong Kim
Poly(vinyl pyrrolidone) (PVP)/La 3+ /Zr 4+ precursor nanofibrous membranes (LZPNM) with various Zr contents were synthesized via a simple electrospinning method. By controlling the Zr incorporation, the tensile properties of precursor membranes dramatically change from 0.77 to 1.73 MPa. Meanwhile, the average diameters of precursor nanofibers increase with the increase of Zr contents (from 283 to 535 nm). In addition, flexible La 2 O 3 -ZrO 2 nanofibrous membranes (LZNM) were obtained by calcination of corresponding precursor membranes. Furthermore, the structures and morphologies of the precursor membranes were investigated using X-ray powder diffraction analysis (XRD) and field-emission scanning electron microscopy (FE-SEM). The surface functional groups and thermal properties of the precursor membranes were measured via Fourier transform infrared (FTIR) spectroscopy and thermogravimetric analysis (TGA).
研究领域:
材料科学
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Lijing Zhang,Jiaqi Han,Yuchao Wang,Wenbo Yang,Shengyang Tao
Achieving a room-temperature Suzuki–Miyaura coupling (SMC) with high efficiency is of great significance to the development of low-carbon organic synthesis. Nevertheless, it is still a great challenge to construct a promising nanocatalyst with high activity for room-temperature SMC reaction. In this paper, a strong alkaline-supported nanocatalyst Pd/Mg(OH)2/MgO–ZrO2 was rationally developed based on MgO–ZrO2 hybrid nanofibers. Physicochemical characterizations present that the in situ conversion of MgO to Mg(OH)2 on the surface of the nanofibers results in a great increase in surface alkalinity of the carrier. The strong alkalinity can greatly accelerate the oxidation addition and transmetalation of the SMC process, resulting in the obvious reduction of activation energy of the reaction (Ea = 9.0 kJmol–1 for Ph–Br). The coupling conversion can reach up to 100% at room temperature within 8 min with a maximum TOF > 6516 h–1. It also shows an excellent performance in substrate applicability and chlorobenzene activation. The rational design of a high-basicity catalyst for room-temperature SMC will be a rewarding attempt for the development of low-carbon green organic synthesis.
研究领域:
催化化学
·
有机合成
·
纳米材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2014
·
IF 2.726
Ben Ma,Kai Li,Bo Chi,Jian Pu,Jian Li
LaNbO 4 –NiO–Y 2 O 3 stabilized ZrO 2 (YSZ) composites are prepared and investigated as an anode-support material for solid oxide fuel cells. To tailor the coefficient of thermal expansion (CTE), electrical conductivity, fracture strength σ and fracture toughness K IC of the composite, various amounts of LaNbO 4 from 0 to 30 wt.% are added into 53 wt.% NiO–47 wt.% YSZ composite. With LaNbO 4 addition into the NiO–YSZ, σ changes insignificantly, whereas CTE decreases and K IC increases monotonously. For 30 wt.% LaNbO 4 –NiO–YSZ, the CTE is 12.4 × 10 − 6 K − 1 (250–1000 °C), which is much closer to that of YSZ, and the K IC is 3.1 MPa-m 1/2 , which is 42% increase compared with that of the NiO–YSZ. The increase in fracture toughness is possibly due to the domain switch within LaNbO 4 and the overall grain refinement of the composite. The electrical conductivity of the reduced composites decreases with increasing the amount of LaNbO 4 and shows metallic conducting behavior with temperature.
研究领域:
材料科学
·
能源工程
·
电化学
✓ 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）