RSC Advances
·
2019
·Vol. 9
·期 37
·21175-21185
·
IF 3.049
Liuyi Pan,Yulong He,Menglong Niu,Yong Dan,Wenhong Li
Ni–M/SiO2 with different binary metals M (M = Ce, Co, Sn, Fe) prepared by an incipient impregnation method was used in the hydrodeoxygenation (HDO) of low-temperature coal tar distillate, which is rich in phenolic compounds. p-Cresol, as a model compound of the distillate, was used to evaluate the activity and selectivity of BTX products on the series of reduced Ni–M/SiO2 catalysts in a fixed bed reactor. The properties of the catalysts were characterized by N2 adsorption–desorption, ICP-AES, XRD, H2-TPR, and XPS. Benzene and toluene as the direct deoxygenation (DDO) products and cyclohexane and methylcyclohexane as the hydrogenolysis (HYD) products were detected to evaluate the selectivity of the path in the deoxygenation process. In this series of catalysts, the order of reactivity was Ni–Ce > Ni–Sn > Ni–Co > Ni–Fe > monometallic Ni. Meanwhile, the addition of Ce and Co loaded in the Lewis acid sites of the catalyst affected the electron distribution of nickel atom and its atomic arrangement on the surface of the carrier. Compared to monometallic Ni, the DDO path become dominant on Ni–Ce and Ni–Co and the selectivity for BTX products increased from 58.8% to 77.4% and 71.1%, respectively. The binary metal Sn, unlike the former two metals, formed a Ni3Sn crystal form with Ni, which resulted in significant enhancement of the HYD path while obviously increasing the reactivity.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2015
·
IF 4.762
Dengrong Sun,Fangxiang Sun,Xiaoyu Deng,Zhaohui Li
Different amounts of Co-substituted Ni-MOF-74 have been prepared via a post-synthetic metal exchange. Inductively coupled plasma mass spectrometry, powder X-ray diffraction (XRD), N2 adsorption/desorption, and extended X-ray absorption fine structure (EXAFS) analyses indicated the successful metathesis between Co and Ni in Ni-MOF-74 to form the solid-solution-like mixed-metal Co/Ni-MOF-74. It was found that introduction of active Co into the Ni-MOF-74 framework enabled the inert Ni-MOF-74 to show activity for cyclohexene oxidation. Since Co was favorably substituted at positions more accessible to the substrate, the mixed-metal Co/Ni-MOF-74 showed superior catalytic performance, compared with pure Co-MOF-74 containing a similar amount of Co. This study provides a facile method to develop solid-solution-like MOFs for heterogeneous catalysis and highlights the great potential of this mixed-metal strategy in the development of MOFs with specific endowed functionalities.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Chunlin Chen,Bin Wang,Guoqing Xiao,Fei Zhong,Jian Zhou,Min Cao,Zhengwei Yang,Chunyan Chen,Rui Zou
In this study, phytic acid -doped polyaniline (PPA) was loaded on the surface of carbon spheres, resulting in a classical C-N-P flame retardant system, that has a beneficial function for the formation of residual carbon. Subsequently, using this phosphorus-nitride carbon sphere (CS/PPA) as a carrier, flower-like Ni-Al-layered double hydroxide (Ni-Al/LDH) were uniformly grown on its surface, thus obtaining a novel nano-fire retardant with a graded structure to heighten the fire-resistant properties of aqueous epoxy resin . Importantly, the intervention of Ni-Al/LDH nanosheets not only imparts a gas-phase fire retardant function to the coating, but also the presence of Ni and Al bimetals can effectively catalyze the formation of more residual carbon in the combustion process. The highest residual carbon (30.7 %) in thermal weight loss experiments of the CS/PPA@Ni-Al/LDH/EP composite coating confirmed this view. Tests on the thermal insulation behavior of coatings illustrated that the backside temperature (168.8 °C) for CS/PPA@Ni-Al/LDH/EP was significantly smaller than that of other coatings, and that this optimum thermal shielding is inextricably linked to the high residual carbon and the residual metal oxides . Furthermore, the CS/PPA@Ni-Al/LDH/EP specimen shown the greatest expansion height (25.1 mm), expansion ratio (19.61) as well as the smallest smoke density rating (39.1 %), proving that its expansion property and smoke suppression were effectively improved. Moreover, the microstructure for the expanded carbon layer demonstrated that the CS/PPA@Ni-Al/LDH filled EP possessed a more complete and dense residual carbon after burning. Moreover, the high degree of graphitization of the residual carbon for CS/PPA@Ni-Al/LDH/EP determined its high thermal stability. The lowest cracked gas phase products and CO release of the CS/PPA@Ni-Al/LDH/EP composite coating during TG-IR testing confirmed its lowest fire toxicity. The development of such a composite flame retardant with a graded structure could help to advance the progress of waterborne intumescent fire coatings.
研究领域:
材料科学
·
火灾安全工程
✓ 已验证
DOI
高影响因子
Reaction Chemistry & Engineering
·
2019
·Vol. 5
·期 1
·58-65
·
IF 3.935
Qingjie Tang,Ziliang Yuan,Shiwei Jin,Kaiyue Yao,Hanmin Yang,Quan Chi,Bing Liu
There has been a great deal of attention to the development of heterogeneous non-noble metal catalysts for the selective and mild hydrogenation of nitro compounds into primary amines. Herein, a biomass-derived carbon material supported Ni catalyst (Ni/C) was facilely prepared by a one-pot pyrolysis process, and the as-prepared Ni/C catalyst demonstrated a high catalytic activity for the hydrogenation of nitro compounds into primary amines at room temperature. The Ni/C catalyst not only demonstrated a high catalytic activity but also showed a good tolerance to other functional groups. Structurally diverse primary amines were achieved in yields from 92% to 99% within a few hours at room temperature under 5 bar H2. Furthermore, the Ni/C catalyst showed good reusability without the loss of its activity.
研究领域:
催化化学
·
材料科学
·
有机合成
✓ 已验证
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2013
·
IF 5.787
Guanfeng Liang,Limin He,Haiyang Cheng,Wei Li,Xiaoru Li,Chao Zhang,Yancun Yu,Fengyu Zhao
A series of Ni catalysts were prepared with various supports (ZSM-5, Al 2 O 3 , SiO 2 , bentonite, TiO 2 , and kieselguhr) and their catalytic properties were investigated for the hydrogenation of cellobiose and glucose, the reaction intermediates of cellulose hydrolysis in hot-compressed water, in order to elucidate the key factors to control the hexitols selectivity in the hydrolytic hydrogenation of cellulose. For the hydrogenation of cellobiose, hexitols were produced with a selectivity above 82% over Ni/ZSM-5, but the other checked Ni catalysts produced large amount of glycerol, ethylene glycol , and propanediol, and the product distribution strikingly depended on the catalysts used. On the basis of kinetic experiments, it was the hydrogenation/dehydrogenation ability of Ni catalyst that played a critical role in controlling hexitols selectivity. High hydrogenation and inferior dehydrogenation activity of Ni catalysts were essential for obtaining high yield of hexitols in the hydrolytic hydrogenation of cellulose. The synergistic effect of Ni active species and acid–base sites was proposed to accelerate the dehydrogenation of sorbitol and thus reducing the yield of hexitols.
研究领域:
化学工程
·
催化科学
·
可再生能源
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Chen Qiao,Zahid Usman,Tai Cao,Souleymen Rafai,Zhitao Wang,Youqi Zhu,Chuanbao Cao,Jiatao Zhang
High-valence Ni and Fe metal sites have demonstrated a crucial role in enhancing the catalytic performances of NiFe-LDH electrocatalysts in oxygen evolution reaction (OER). Although considerable OER catalytic performances achieved under high overpotential, the catalytic talent of NiFe-LDH electrocatalysts at low overpotential is rarely realized due to the absence of high-valence Ni and Fe sites. We herein report a surface engineering route to fabricate sulfated NiFe-LDH nanosheets via ion exchange strategy in sulfate-rich media. XPS results reveal a modified surface electronic structure with high-valence Ni and Fe after ion exchange reaction. Computational PDOS results suggest that computed d-band centers (ε d ) of Fe and Ni for sulfated NiFe-LDH show a significant downward shift resulting an increased valence of metal cation with orbital volume shrinkage. The high-valence Fe can facilitate a optimized multi-electron process of Ni center from [Ni II -OH] − /[Ni III -OH] − to Ni IV -OOH rather than Ni II /Ni III to Ni IV at low overpotential. The high-valence Ni can serve as the highly active center for O-O coupling during OER process. Combined with the synergetic action of high-valence Fe and Ni, the sulfated NiFe-LDH nanosheets exhibit much larger reaction kinetics and outstanding electrocatalytic activity on glassy carbon electrode (η 10 = 219 mV, η 50 = 288 mV) with a remarkable long-term stability.
研究领域:
材料科学
·
电化学
·
催化科学
✓ 已验证
DOI
高影响因子
ANALYST
·
2020
·Vol. 145
·期 19
·6349-6356
·
IF 3.978
Ye Hu,Chaochao Yue,Jing Wang,Yuhua Zhang,Wenhui Fang,Jiaqi Dang,Ying Wu,Hong Zhao,Zengxi Li
Fe–Ni-MOFs with different amounts of Fe are synthesized through a two-step template etching method. Kinetic analysis indicates that Fe–Ni-MOF exhibits prominent intrinsic peroxidase-like activity, which could catalytically oxidize 3,3′,5,5′-tetramethylbenzidine (TMB) to produce oxidized TMB (oxTMB) with a blue color. As a peroxidase-mimicking MOF, Fe–Ni-MOF with its efficient stable catalysis properties is demonstrated to allow a sensitive colorimetric assay for Sn2+ ions. The mechanism is explored, whereby Sn2+ ions could reduce the peroxidase-like activity of Fe–Ni-MOF based on a redox interaction, making the oxTMB color lighter and decreasing the absorbance intensity at 652 nm. The linear determination of the Sn2+ ion concentration using a UV-vis spectrometer ranges from 0.01 mM to 1.0 mM and from 1.0 mM to 4.0 mM. The presented Fe–Ni-MOF-based assay of Sn2+ ions was successfully applied to real water samples.
研究领域:
材料科学
·
分析化学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Energy Storage
·
2021
·
IF 6.583
XianYan Jiang,ShuPing Deng,JunJie Liu,Ning Qi,ZhiQuan Chen
In this work, metal oxide/metal@carbon (NiO/Ni@C) composites as electrode materials have been successfully prepared using the pillared Ni 2 (bdc) 2 (dabco) (bdc = 1,4-benzenedicarboxylic acid, dabco = 1,4-diazabicyclo[2.2.2]-octane) as the precursor. Owing to the multiple active sites (NiO, Ni and Carbon), rich oxygen defects, and abundant Ni 3 + , the NiO/Ni@C composites show excellent electrochemical performance. A maximum specific capacitance of 805.3 F g −1 at 0.5 A g −1 and 576.2 F g −1 at 10 A g −1 is obtained for the NiO/Ni@C electrode material calcined at 500 °C, indicating a high rate capability. Meanwhile, the assembled asymmetric supercapacitor (ASC) NiO/Ni@C//PEDOT-AC (poly(3,4-ethylenedioxy-thiophene)-activated carbon) has a wide working voltage of 0–1.7 V, high specific energy of 20.7 W h kg −1 , superior specific power of 12920 W kg −1 , and excellent cycle stability with capacitance retention of 69.7% after 10 000 cycles. Furthermore, a red light-emitting diode (LED) is lighted up by two NiO/Ni@C//PEDOT-AC ASCs in series connection.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2021
·
IF 3.171
Zhen He,Yu Zhou,Yuxin Wang,Pingyi Guo,Wensen Jiang,Caizhen Yao,Xin Shu
Several Ni-W-P-TiO 2 nanocomposite coatings were developed by the sol-enhanced electroplating method. The phase and elemental compositions of coatings were determined, and the surface and cross-section morphology were characterized. The mechanical and corrosion performance were systematically tested. The results revealed the addition of 5 ml·L −1 TiO 2 sol caused a compact coating surface, while higher concentrations of TiO 2 reduced the coating thickness and led to the inferior surface microstructure. The comparison in physiochemical properties of prepared coatings confirmed the superior performance of the Ni-W-P-TiO 2 nanocomposite coating at 5 ml·L −1 TiO 2 sol addition. Under this condition, the best mechanical properties were achieved when abrasive wear was the dominating wear-resistance mechanism, and the best corrosion resistance was obtained due to its smooth and compact surface microstructure.
研究领域:
材料科学
·
电化学
·
表面工程
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2022
·Vol. 24
·期 36
·6400-6407
·
IF 3.756
Anzhou Yang,Qiuzi Huang,Ziqi Wei,Zehan Yu,Meifeng Cui,Wu Lei,Yawen Tang,Xiaoyu Qiu
Designing cost-effective, highly active, and durable noble-metal-free electrocatalysts as alternative electrode materials for the methanol oxidation reaction (MOR) is of significant importance for practical applications. Herein, we report a facile one-pot synthetic route to construct Cu@Ni core–satellite nanoassemblies (CS-NAs) with the assistance of eco-friendly L-lysine, which involves the spontaneous process of preferential formation of the Cu core followed by self-assembly growth of Ni satellites. The selection of the Cu core is beneficial for enhancing the charge transfer and tuning the electronic structure of Ni satellites, as well as serving as a self-skeleton to enhance the structural stability for catalysis. Meanwhile, the tiny Ni satellites could be fully exposed, which not only produce a larger number of valid active sites, but also provide a short electron and ion transport distance. As a result, the Cu@Ni CS-NAs are qualified as superior and durable electrocatalysts for the MOR, affording 29.6 mA cm−2 at 1.6 V with long-term chronoamperometric stability.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Kuangfu Huang,Ruohao Dong,Chao Wang,Wen Li,Hongxia Sun,Baoyou Geng
Design and synthesis of highly efficient, stable, and low-cost catalysts have a crucial role in the study of electrolytic water. In this work, a novel Fe–Ni layered double hydroxide (LDH) material with homogeneous heterostructures is successfully synthesized by a two-step hydrothermal method. Compared with the ordinary Fe–Ni LDH arrays prepared by one step, this structure has a rougher surface, so it has a more extensive active area, thus providing more active sites. Due to the synergistic effect of different elements and more exposure of active sites, the catalytic effect of this material for water splitting is outstanding. The post-optimized FeNi@FeNi electrode exhibits extraordinary OER (oxygen evolution reaction) and HER (hydrogen evolution reaction) performance with OER overpotentials of 193, 231, and 306 mV and HER overpotentials of 127, 173, and 253 mV when the current density is 10, 20, and 50 mA·cm–2, respectively. The improved electrolytic water performance reveals that the design of homogeneous heterostructures is maybe an alternative route to exploit high-efficiency catalysts and promote the application of nonprecious metal catalytic materials.
研究领域:
材料科学
·
电化学
·
催化
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Zhihui Ma,Hongrui Guo,Pengfei Wang,Lichun Dai,Sihui Zhan,Feng Shen
The electrocatalytic oxidation of biomass-derived glucose to formic acid (FA) represents a sustainable route for biomass valorization, yet achieving simultaneous high selectivity and current density remains challenging due to sluggish electron transfer and competing side reactions. Herein, bimetallic oxide ultra-thin nanosheets grown on Ni foam (NiCoO-NS/NF) with established Ni-O-Co electronic channels are fabricated via a facile Cl − corrosion and calcination strategy. The ultra-thin nanosheet structure offers abundant exposed active sites, and the introduced Co 2+ with the unique valence electronic configuration is able to drive the partial electron migration from Ni to Co via the bridging μ-O ligand, forming Ni-O-Co electronic channels. This significantly facilitates electron transport and promotes rapid NiOOH active species formation, as evidenced by in situ spectroscopy measurements and computational analyses. Remarkably, NiCoO-NS/NF exhibits an exceptional GOR current density of 222.70 mA/cm 2 at 1.4 V vs RHE, surpassing NiO-NS/NF and bare Ni foam by 2.29-fold and 7.53-fold, respectively. The enhanced kinetics suppress non-Faradaic degradation, delivering a high Faradaic efficiency beyond 90.00 % within 1 h in 0.1 M glucose. This work provides a novel strategy for constructing electron-channel-rich nanostructures to effectively enhance the performance of glucose electrooxidation over Ni-based catalysts, advancing the development of biomass upgrading.
研究领域:
材料科学
·
电化学
·
催化反应
✓ 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）