Catalysis Science & Technology
·
2021
·Vol. 11
·期 9
·3241-3250
·
IF 6.119
Ming Jiang,Xiaopeng Chen,Linlin Wang,Jiezhen Liang,Xiaojie Wei
Selective hydrogenolysis of aryl ethers to produce aromatic compounds is a key strategy for lignin valorization. The use of non-noble-metal catalysts to realize the cleavage of C–O ether bonds under mild conditions has been of considerable research interest recently. We herein report the synthesis of a nitrogen-doped porous-carbon-skeleton-supported Ni–CeO2 catalyst (Ni–CeO2/CN). The synergistic effect between Ni and CeO2 species led to the Ni–CeO2/CN catalyst having a high activity and selectivity for the cleavage of C–O ether bonds at a low reaction temperature. In particular, the Ni–CeO2/CN catalyst showed excellent effectiveness in the hydrogenolysis of benzyl phenyl ether (α-O-4 bonds), and the full conversion was achieved after 2 h at a temperature of 60 °C, with phenol and toluene as the sole reaction products. In addition, the conversion of more robust β-O-4 ether bonds in 2-phenoxy-1-phenylethanol reached up to 100% with the yield of ethylbenzene and phenol at 150 °C for 2.5 h being 60.2% and 68.3%, respectively. The reusability-experiment results indicate that Ni–CeO2/CN maintained a high catalytic activity in five reaction runs, making this a promising route for C–O ether bond cleavage under mild conditions.
研究领域:
催化化学
·
生物质转化
·
材料科学
✓ 已验证
DOI
高影响因子
Catalysts
·
2022
·Vol. 12
·期 12
·1625
·
IF 4.501
Bo Chen,Zhi-Ze Cao,Zhi-Jun Diao,Liang-Qiu Huang,Si-Jia Zhao,Hong Yuan,Jia-Meng He
Hydrogenolysis via targeted depolymerization of C–O linkages is a techno-economic beneficial process for converting lignin into highly valuable chemicals and clean fuels. In this work, a macroporous silicalite-1 (S-1) array-supported Ru-Ni metallic phosphide composite (Ru-Ni12P5/S-15) was prepared as a catalyst and hydrogenolysis activity under relative mild conditions was investigated using a series of compounds containing ether linkages as lignin-related model compounds. The Lewis acid sites originating from the unreduced Ru species and the macroporous geometry of S-1 significantly influenced hydrogenolysis activity and product selectivity. Analysis of the mechanism demonstrated that both the aryl ether and aliphatic ether linkages were directly hydrogenated over Ru-Ni12P5/S-15. 2D-HSQC-NMR spectroscopy demonstrated that the ether linkages of lignin were efficiently cleaved by Ru-Ni12P5/S-15. Furthermore, the obtained liquid hydrogenolysis products are high value-added chemicals used for pharmaceutical production and can be facilely tuned via the reaction conditions.
研究领域:
催化化学
·
可再生资源转化
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Zhimin Lv,Shuya Liu,Yuxin Liu,Peisheng Liu,Ming Fang,Xiaoli Tan,Wei Xu,Mingguang Kong,Xiangke Wang
The pollution of poisonous Cr(VI) poses a severe threat to our health, and the reduction of Cr(VI) to Cr(III) has become a high-efficiency way for wastewater remediation. Herein, the catalyst with metallic Ni confined in an N-doped mesoporous carbon sphere was prepared by the easy pyrolysis method of carbon sphere with Ni salts and showed remarkable activity, selectivity, and stability for reducing Cr(VI) with HCOOH. Notably, the Ni-N-C600 can rapid and 100 % reduction of the high concentrations of Cr(VI) (100 mg/L, 100 ml) using HCOOH within 7 min at room temperature over the reported Ni-based catalysts. Even in the presence of coexisting ions (0.1 M of Na + , K + , Ca 2+ , Zn 2+ , NO 3 − , Cl − , CO 3 2− , and SO 4 2− ), its catalytic efficiency is not affected at all. The catalytic activity of the Ni-N-C600 declined little even after five cycles because the confinement effect of the mesoporous carbon sphere physical barrier prevented the leaching and aggregation of Ni NPs. The magnetism of metallic Ni greatly facilitates the separation of the catalyst. The reduction mechanism is mainly achieved by active hydrogen produced through the dehydrogenation of HCOOH. In addition, the electronic donation of C-containing functional groups also caused a partial reduction of Cr(VI). This work provides a rational design and development of high-efficiency non-noble metal catalysts to reduce Cr(VI).
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2021
·
IF 9.028
Wenxiao Zheng,Liuyi Zhu,Zhang Yan,Zichao Lin,Zhenchao Lei,Yifan Zhang,Haolin Xu,Zhi Dang,Chaohai Wei,Chunhua Feng
Electrocatalytic reduction has recently received increasing attention as a method of converting waste nitrate into value-added ammonia, but most studies have focused on complex strategies of catalyst preparation and little has been done in the way of large-scale demonstrations. Herein, we report that in situ activation of a pristine Ni electrode, either on a lab scale or a pilot scale, is effective in facilitating nitrate reduction to ammonia, exhibiting extraordinarily high activity, selectivity, and stability. The self-activated Ni cathode has a robust capacity to reduce nitrate over a wide range of concentrations and achieves great conversion yield, NH4+–N selectivity, and Faradaic efficiency, respectively, 95.3, 95.5, and 64.4% at 200 mg L–1 NO3––N and 97.8, 97.1, and 90.4% at 2000 mg L–1 NO3––N, for example. Fundamental research indicates that Ni(OH)2 nanoparticles are formed on the Ni electrode surface upon self-activation, which play crucial roles in governing nitrate reduction reaction (NO3RR) through the atomic H*-mediated pathway and accordingly suppressing hydrogen evolution reaction. More importantly, the self-activated Ni(OH)2@Ni cathode can be easily scaled up to allow large volumes of real industrial wastewater to be processed, successfully transferring nitrate into ammonia with high yields and Faradaic efficiency. This study demonstrates a new, mild, and promising method of cleaning nitrate-laden wastewater that produces ammonia as a valuable byproduct.
研究领域:
环境科学
·
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 51
·期 9
·5310-5321
·
IF 2.047
Shen Yuli,Yang Juan,Zhang Yuanyuan,Zeng Ting,Wan Qijin
Efficient sensing materials are required to achieve sensitive, selective, and reproductive detection of different targets by means of electrochemical approaches. In this study, a sensing material of a Ni-doped ZnO/graphene nanoplatelet (Ni-ZnO/GNP) composite is constructed through a simple hydrothermal method and further utilized for electrochemical determination of frequently used drugs, acetaminophen and estradiol. The characterization of this Ni-ZnO/GNP hybrid using scanning electron microscopy (SEM), transmission electron microscopy (TEM), x-ray photoelectron spectroscopy (XPS), x-ray powder diffraction (XRD), Raman spectroscopy, and electrochemical techniques reveals that in this composite the highly conductive GNP provides abundant active sites for the growth of Ni-ZnO, while the introduction of Ni-ZnO weakens the accumulation of the GNP. In comparison to either Ni-ZnO or the GNP, the Ni-ZnO/GNP composite exhibits a much larger electrochemically active area and enhanced catalytic activity. In this regard, the electrochemical response of both acetaminophen and estradiol is improved, resulting in their sensitive and reproductive determination with detection limits of as low as 0.0072 and 0.00056 µM, respectively. This study offers a new approach to design high-performance sensing materials as well as to explore their applications for the determination of trace-leveled drugs. Graphical Abstract
研究领域:
材料科学
·
分析化学
·
药物分析
✓ 已验证
DOI
高影响因子
CATALYSIS SURVEYS FROM ASIA
·
2023
·Vol. 27
·期 4
·406-414
·
IF 3
Han Yujun,Shi Yinteng,Wang Dandan,Zhou Hantao,Chen Jixiang
Ni/ZrO 2 (Ni/Zr) and Ni/WO 3 -ZrO 2 (Ni/ x WZr, x denotes WO 3 /ZrO 2 mass ratios) were prepared by the impregnation-direct reduction method and tested for the aqueous phase hydrogenation of phenol to cyclohexanone in an autoclave reactor. It has been found that the Ni-W alloy forms in Ni/ x WZr, and a charge transfer occurs from Ni to W. The presence of W species promotes the Ni dispersion and increases the amounts of acid sites and spilt-over hydrogen species. This leads to higher hydrogenation and direct deoxygenation activity of Ni/ x WZr than that of Ni/Zr. In addition, the W 6+ and W 4+ species, acted as Lewis acidic sites, may stabilize cyclohexanone and the hydrogenation of cyclohexanone to cyclohexanol is inhibited. Under suitable condition, the phenol conversion and the cyclohexanone selectivity reach 93.1 and 90.6% on Ni/0.8WZr, respectively.
研究领域:
催化
·
化学反应工程
·
有机化学
·
材料科学
✓ 已验证
DOI
高影响因子
CORROSION SCIENCE
·
2024
·
IF 7.4
Zebang He,Zhong Wu,Zhiming Gao,Zhenbo Qin,Juntao Yuan,Yuan Gao,Yaorong Feng,Anqing Fu,Chun Wang,Wenbin Hu
A Ni-Al-Cu coating was prepared on NAB alloy through electroplating and heat treatment, and the erosion-corrosion behaviors were investigated. The results demonstrated that Ni-Al-Cu coating exhibited higher erosion resistance compared to NAB alloy, with an average reduction of 63 % in material removal rate (MRR). It was revealed that deformation and cracks were observed in NAB, with loss of hard κ and β phases alongside deformation of ductile α phase. Meanwhile, Ni-Al-Cu coating experienced fatigue delamination and grain disintegration due to alternating stress. Taguchi design method showed that increasing flow velocity and sand concentration could enhance the intensity of gravel impact, while changes in the erosion angle affected gravel impact modes and energy transfer, thereby impacting corrosion performance. Additionally, empirical equations for the material removal rate were derived through regression analysis, which became possible to predict the MRR under different influencing factors and assess the erosion-corrosion resistance of materials.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2018
·
IF 3.716
Ning Zhang,Chuanhui Huang,Ping Tong,Zunmei Feng,Xiaoping Wu,Lan Zhang
Volatile polycyclic aromatic hydrocarbons (PAHs) in water and soil are associated with status in the human body. Development of simple, efficient detection method is challenging due to the coating could be attacked by the abundance of water in the direct-immersion solid-phase microextraction. The stability of coating is essential to the analysis results. In this paper, a stable Ni-Zn MOF/g-C 3 N 4 (MG NFs) nanoflowers with cavity traps structure was firstly reported and acted as solid-phase microextraction (SPME) adsorbent for PAHs. Markedly enhanced moisture and acid stability of the MG NFs was obtained through the doping the hydrophobic graphitic carbon nitride (g-C 3 N 4 ) and metal ions into metal organic frameworks (MOFs). The aperture environment and ambient environment of MG NFs were changed by the doping of the Ni and the g-C 3 N 4, respectively. The moisture and acid stability of MG NFs were prominently increased under the dual protection. Compared to commonly used commercial coatings, the MG NFs own large surface area, unique nanoflowers structure and numerous open metal sites on the nanosheets, which demonstrated significant extraction superiority for PAHs. The MG NFs coated fiber was used for the SPME preconcentration of PAHs and couped with GC–MS for detecting PAHs. It presented low detection limits (0.1–3.0 ng L −1 ), wide linearity (0.3–5000.0 ng L −1 ) and good linearity (the correlation coefficient >0.9951). The inter-day and intra-day relative standard deviation (RSD) (n = 3) for three replicate extractions using one fiber was 3.8%–9.1%, and 3.5%–9.2%, respectively. The fiber-to-fiber reproducibility (n = 3) was 4.2–11.8%. The coupling method was successfully applied in the analysis of real water and soil samples with satisfactory recoveries of 82.9–109.2%, 84.2–106.4%, and the corresponding RSDs were 2.4–11.3%, 3.6–10.8%, respectively. The results indicated the effectiveness of NG NFs coated fiber in further practical application.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 57
·29968-29974
·
IF 3.708
Yongjuan Wang,Yuming Zhou,Tao Zhang,Man He,Xiaohai Bu
This work describes a facile approach for the delaminating of Ni–In-layered double hydroxides (LDHs) by the intercalation of acetate anions in the LDHs gallery using co-precipitation method. The acetate-intercalated Ni–In LDHs exhibited swelling behavior in water and delaminated into semitransparent suspensions on the action of water. The transmission electron microscopy (TEM) and atomic force microscopic (AFM) observations revealed the formation of unilamellar LDHs nanosheets. This simple method did not need reflux at high temperatures, overcoming the deficiency of using organic solvents, resulting in a steady colloidal suspension of 2D nanosheets. The unique properties of 2D ultrathin nanosheets with full access to the positively charged activity sites make them attractive in terms of the improvement of DNA adsorption. The effect of dosage on the adsorption of DNA and the adsorption isotherm were investigated in detail. The equilibrium data were found to be well described by both the Langmuir and Freundlich models. Based on the mechanism of adsorption, the adsorption sites of exfoliated nanosheets can be easily occupied by highly negatively charged small anions through electrostatic interactions. The adsorbed DNA can be released via the addition of a hydrogen phosphate solution.
研究领域:
材料科学
·
生物化学
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 32
·期 33
·335603
·
IF 3.874
Baige Yuan,Jun Li,Manman Xia,Ying Zhang,Ruyan Lei,Peng Zhao,Xiao Li
Hollow-structured NiO + Ni nanofibers wrapped by graphene were designed and successfully fabricated via a simple method. First, solid NiO + Ni nanofibers were prepared by electrospinning followed by calcination. Here, a portion of the metallic Ni was retained to improve the electrochemical performance of NiO by adjusting the calcination temperature. Next, the nanofibers were thoroughly mixed with different amounts of graphene and calcinated once more to form hollow-structured NiO + Ni nanofibers with an extremely high specific surface via the reaction between graphene and NiO on the nanofiber surface and subsequent migration of NiO into the nanofibers. Results showed that the obtained hollow-structured NiO + Ni electrode demonstrates optimal electrochemical performance when the graphene content is controlled to 3 wt%. The first cycle discharge/charge specific capacity of the electrode peaked (1596/1181 mAh · g−1 ) at 100 mA · g−1, with a coulombic efficiency of approximately 74% (60% for 0 wt% graphene, 65% for 1 wt% graphene, and 51% for 4 wt% graphene). It also presented excellent cycling stability after 100 cycles at 100 mA · g−1 on account of its high retained discharge specific capacity (251 mAh · g−1 for 0 wt% graphene, 385 mAh · g−1 for 1 wt% graphene, 741 mAh · g−1 for 3 wt% graphene, and 367 mAh · g−1 for 4 wt% graphene). Moreover, the synthesized electrode possessed outstanding rate capability owing to its large average discharge specific capacity of approximately 546 mAh · g−1 (45 mAh · g−1 for 0 wt% graphene, 256 mAh · g−1 for 1 wt% graphene, and 174 mAh · g−1 for 4 wt% graphene) from 100 mA · g−1 to 2000 mA · g−1. The observed improvement in electrochemical performance could be attributed to the increase in active sites and decrease in charge transport distance in the hollow-structured NiO + Ni nanofibers. Excessive introduction of graphene caused a sharp loss in electrochemical performance due to the agglomeration of graphene sheets on the nanofiber surfaces.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Hongtao Zou,Shiliang Zhang,Xiaoling Hong,Qilu Yao,Yan Luo,Zhang-Hui Lu
As an ideal hydrogen supplier in liquid phase, hydrous hydrazine has gained a lot of attention for safe and efficient storage as well as transportation of hydrogen. Herein, a low Pt-containing Ni–Pt bimetallic catalyst immobilized on novel MIL-101/rGO composite has been prepared by a facile impregnation-reduction approach. Unexpectedly, the resultant Ni 0.9 Pt 0.1 /MIL-101/rGO catalyst exhibits optimal catalytic performance and 100% H 2 selectivity for hydrogen evolution from hydrous hydrazine under alkaline conditions at 323 K, giving a turnover frequency (TOF) value of 960.0 h −1 , which is a relatively higher value ever reported heterogeneous catalysts. Even at room temperature, Ni 0.9 Pt 0.1 /MIL-101/rGO catalyst shows excellent catalytic activity for dehydrogenation of hydrazine as well as hydrazine borane. In addition, the Ni 0.9 Pt 0.1 /MIL-101/rGO catalyst also exhibits excellent durability. Even after eight recycles, the catalytic activity is no significant decrease, and the H 2 selectivity still remains 100%.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2021
·Vol. 29
·期 1
·49-61
·
IF 2.496
Liu Wei,Zhang Guoliang,Hao Songyuan,Yuan Hong,He Weidong
Waste cooking oils (WCOs) are a cheap and rich source of carbon and hydrogen, and they exhibit great potential for the preparation of hydrogen gas and carbon nanomaterials. Here, we prepared three Pt–Ni/SBA-15 catalysts with Pt contents ranging from 0 to 2% to examine their activity in the catalytic cracking of WCO towards the production of hydrogen and carbon nanotubes (CNTs). A mixture of soybean oil, oleic acid and animal fat was used as a model compound of WCO, and the catalysts were characterised by inductively coupled plasma–optical emission spectrometry, scanning and transmission electron microscopy, X-ray diffraction, N 2 adsorption–desorption isotherms, temperature programmed reduction, thermogravimetric analysis and Raman spectroscopy. The effect of Pt loading and cracking temperature on the hydrogen production and the quality of CNTs was also evaluated. Among the prepared catalysts, 2%Pt–30%Ni/SBA-15 showed excellent catalytic activity at 750 °C, affording a maximum hydrogen content of 66.2 vol%, while CNTs with diameters of 20–100 nm and high crystallinity, oxidation stability, graphitisation and purity were also prepared.
研究领域:
能源科学
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）