CRYSTENGCOMM
·
2019
·Vol. 21
·期 40
·6010-6017
·
IF 3.382
Shuai Fang,Hongan Ma,Zhanke Wang,Zhiqiang Yang,Zheng-hao Cai,Luyao Ding,Xinyuan Miao,Liangchao Chen,XiaoPeng Jia
FeS is the main sulfur-containing compound in natural diamond inclusions. The research on FeS-doped diamond crystals plays an extremely important role in exploring the growth environment of natural diamond and the chemical composition of the earth. In our work, the characteristics of FeS doped diamond crystals were studied by using a China-type large volume cubic high-pressure apparatus with an iron–nickel alloy as a catalyst at 6.0 GPa and 1300–1350 °C. The crystals were characterized by OM, SEM, XPS, FTIR and Raman. Scanning electron microscopy of the crystal shows that the {100} plane of the crystal is rougher than {111}, which is related to the number of dangling bonds on different crystal faces of the crystal. The residue on the surface of the crystal was detected by mapping, and the test result showed that it was a sulfur iron and a sulfur nickel compound. FeS will decompose in the synthesis system, and the decomposition products are Fe and S2.The XPS spectrum of the crystal shows that S was successfully incorporated into the diamond lattice by forming C–S–O and C–S–SO2–C bonds, and the peak intensity was strong. The infrared spectrum shows that the N content in the crystal gradually increases as the doping ratio increases. Raman spectroscopy analysis shows that the S-doped Ib-type diamond single crystal has a high-quality sp3 structure, and the full width at half maximum (FWHM) of the crystal gradually broadens as the doping ratio increases.
研究领域:
地球化学
·
材料科学
·
高压合成
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Song Cheng,Yutao Liu,Xinyi Liu,Changqing Zhu,Jingyang Luo,Jiashun Cao,Fuqiang Liu
Electro-assisted activation of peroxymonosulfate (EA-PMS) by transition metals oxides (TMOs) has been extensively studied for the removal of organic pollutants. Despite TMOs possess considerable activity and affinity to PMS, their poor bulk conductivity still limits the electron exchange during the TM δ/δ+1 redox cycle, especially the efficient reduction of TM δ+1 via cathodic process. In this study, carbon felt loaded with modified Co 3 O 4 nanosheets (Co@FCF) was fabricated and applied as the flow-through electrode of EA-PMS process, where the Co 3 O 4 nanosheets were embedded with numerous metallic Ni particles encapsulated within carbon layers (Ni@C). Driven by weak electric current, continuous electrons can be supplied to the bulk Co 3 O 4 from the electron-rich Ni@C nanoparticles, resulting in accelerated Co 3+ /Co 2+ cycle, enhanced production of SO 4 ·− and improved energy utilization efficiency. Electrochemical tests along with density functional theory calculations indicate that the unique structure of Co@FCF played essential role in the enhanced performance.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Zhichao Yu,Xin Liu,Yang Liu,Yuan Li,Zhuohan Zhang,Kangli Chen,Shumin Han
Multiple catalysts have exhibited high activity on improving the hydrogen storage performance of MgH 2 . Herein, the hydrogen ab/desorption kinetics of MgH 2 is significantly improved by using Ni@C@CeO 2 as the catalyst. The results show that 10 wt%-Ni@C@CeO 2 doped MgH 2 can absorb 4.51 wt% hydrogen within 60 min under low temperature 75 °C. Furthermore, the MgH 2 -Ni@C@CeO 2 composites release approximately 4.88 wt% H 2 within 10 min at 325 °C. Moreover, the composites show excellent cycling performance, with negligible decrease in hydrogen storage capacity, hydrogen uptake rate and hydrogen release rate after ten cycles at 350 °C. The Rietveld refinement of X-ray diffraction and transmittance electron microscopy measurements reveal that Mg 2 NiH 4 /Mg 2 Ni and CeH 2.73 phases are in-situ formed. The mutual conversion of “Mg 2 Ni/Mg 2 NiH 4 ” during hydrogen ab/desorption is a well-known “hydrogen pump” effect, which improvs the hydrogen storage performance of MgH 2 . The presence of CeH 2.73 accelerate the conversion of Mg 2 Ni/Mg 2 NiH 4 , which we call ‘facilitated hydrogen pump’ effect. This attempt paves a potential way to achieve high performance Mg-based composites hydrogen storage materials via collaborative action between Ni and Ce species.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Chengliang Wang,Yin Zhang,Haitao Li,Feifan Zhang,Jie Wang,Wei Wei,Yongxiang Zhao
Core-shell Ni@C catalysts with a uniform grain size distribution were synthesised via a simple hydrothermal method followed by pyrolysis carbonisation, and their catalytic performance for the liquid-phase hydrogenation of maleic anhydride (MA) was investigated herein. When the pyrolysis temperature was 350 °C, the resulting Ni@C catalyst (Ni@C-350) possessed abundant Ni/NiO heterostructures and a carbon surface layer. Among the analysed catalysts, Ni@C-350 demonstrated the lowest apparent activation energy for the hydrogenation of C C bonds ( Ea = 34.3 KJ/mol) and C O bonds ( Ea = 65.18 KJ/mol), yielding an MA conversion of 100 % and a γ-butyrolactone (GBL) selectivity of 99.89 % under mild reaction conditions (200 °C, 3 MPa hydrogen pressure, and 0.05 g catalyst). Furthermore, the Ni@C-350 catalyst exhibited high stability, with the yield of GBL above 95 % after five consecutive usage cycles. Ni@C-350 significantly outperformed other previously reported catalysts for the liquid-phase hydrogenation of MA.
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
CARBOHYDRATE POLYMERS
·
2025
·
IF 12.5
Fang Ren,Lin Ma,Chunjie Li,Tong Wu,Jiale Zhang,Lu Pei,Yanling Jin,Zhenfeng Sun,Zhengzheng Guo,Ping Song,Penggang Ren
Metal−organic framework (MOF)-derived magnetic porous carbon not only have excellent magnetic loss, but also can construct various nanostructures through appropriate design to enhance electromagnetic waves (EMWs) absorption. Herein, magnetic porous carbon (Co/Ni@C) derived from rod-shaped Co/Ni-MOFs was selected as magnetic components and MXene was regarded as conductive materials to construct the three-dimensional porous Co/Ni@C/MXene/cellulose-derived carbon foams via a simple solution mixing-regeneration, freeze-drying process and a facile pyrolysis strategy. Due to the electric/magnetic coupling loss and the interfacial polarization loss caused by multi-interface architecture, the synthesized carbon foam achieves an absorption coefficient of 0.54 and a high EMI SE of 70.4 dB, which enhances the electromagnetic shielding performance without damaging the high absorption coefficient. This work provides a basis for the preparation of electromagnetic shielding composite materials with multi-interface structures to achieve efficient EMI SE and superior absorption coefficients.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Asia-Pacific Journal of Chemical Engineering
·
2022
·Vol. 17
·期 2
·e2739
·
IF 1.777
Yuan Wang,Shanshan Liu,Qirui Guo,Yidong Zhang
Conversion of biomass-derived furfural platform compound to value-added tetrahydrofurfuryl alcohol (THFL) molecule is a sustainable route, and an efficient nonnoble metallic catalyst is a key factor for this reaction. In this work, Ni@C@CNT composite as a highly effective catalyst for hydrogenation of furfural to tetrahydrofurfuryl alcohol was synthesized by one-step pyrolysis of Ni-centered metal organic framework (Ni-MOF) doping with carbon nanotube (CNT). For comparison, Ni@C catalyst derived directly from Ni-MOF was also synthesized. The characterization results show that the doping of CNT promotes high dispersion of active sites and formation of Ni 3 C phase which has Pt-like catalytic activity. Therefore, the obtained Ni@C@CNT exhibited excellent activity in furfural hydrogenation (99.1% furfural conversion and 94.7% THFL yield at 120°C, 4 h, 4-MPa initial hydrogen pressure). Ni@C@CNT also shows good stability in reuse test. Current work presents a facile method for preparation of nonnoble metallic catalysts with high efficiency.
研究领域:
化学工程
·
催化材料
✓ 已验证
DOI
高影响因子
Reaction Chemistry & Engineering
·
2022
·Vol. 7
·期 5
·1126-1135
·
IF 5.2
Shanshan Lin,Jianguo Liu,Longlong Ma
The catalytic hydrogenation of organic substrates containing plenty of unsaturated functional groups is an important step in the industrial preparation of fine chemicals and has always been a hot spot in basic catalysis research. For example, phenylethanol obtained by the preferential hydrogenation of the CO group of acetophenone is a valuable intermediate for the production of spices, flavors, and medicines. Furthermore, as the demand for 1-phenylethanol (PhE) continues to increase, the catalytic hydrogenation of acetophenone (AP) is becoming more and more important. At present, relatively few catalytic systems are used in this reaction as the hydrogenation of acetophenone is a complex multi-step reaction. Enantioselective hydrogenation on heterogeneous catalysts is remarkable due to its inherent operational and economic advantages, such as atom economy. It is one of the most ideal methods as the catalyst is easily separated and recycled. However, the traditional synthesis way in batch reactors usually takes a long time with unsatisfactory conversion which is not conducive to industrialization. Heterogeneous non-precious metal catalysts are advantageous for their implementation in flow reactor systems for industrial applications due to their ease of separation, low cost, and environmental friendliness. Herein, we report the first use of non-noble metal Ni-supported graphene-based catalysts for hydrogenation of acetophenone to phenylethanol with high efficiency in a flow reactor made of 316L stainless steel with a length of 200 mm and an inner diameter of 6 mm which can significantly improve mass and heat transfer. The conversion rate under the optimized reaction conditions can reach 99.14% with a satisfactory selectivity of 97.77% (the conversion and selectivity are in mol%). The magnetic catalyst has a compact structure, and the Ni particles coated with carbon on the surface are uniformly distributed. After 48 hours of uninterrupted continuous experiments, the conversion rate of acetophenone still reached 88.44%. The catalyst has good cyclability, and the Ni-based catalyst after the cycle still maintains high catalytic activity without obvious deactivation, and the catalyst structure remains intact and stable.
研究领域:
催化化学
·
工业化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2016
·
IF 2.628
Junjie Zhang,Fang Lu,Weiqiang Yu,Rui Lu,Jie Xu
Lactic acid is produced as a major byproduct during sorbitol hydrogenolysis under alkaline conditions. We investigated the effects of two different alkaline additives, Ca(OH) 2 and La(OH) 3 , on lactic acid formation during sorbitol hydrogenolysis over Ni/C catalyst. In the case of Ca(OH) 2 , the selectivity of lactic acid was 8.9%. In contrast, the inclusion of La(OH) 3 resulted in a sorbitol conversion of 99% with only trace quantities of lactic acid being detected. In addition, the total selectivity towards the C2 and C4 products increased from 20.0% to 24.5% going from Ca(OH) 2 to La(OH) 3 . These results therefore indicated that La(OH) 3 could be used as an efficient alkaline additive to enhance the conversion of sorbitol. Pyruvic aldehyde, which is formed as an intermediate during sorbitol hydrogenolysis, can be converted to both 1,2-propylene glycol and lactic acid by hydrogenation and rearrangement reactions, respectively. Notably, these two reactions are competitive. When Ca(OH) 2 was used as an additive for sorbitol hydrogenolysis, both the hydrogenation and rearrangement reactions occurred. In contrast, the use of La(OH) 3 favored the hydrogenation reaction, with only trace quantities of lactic acid being formed.
研究领域:
化学工程
·
催化反应
✓ 已验证
产品关联
DOI
高影响因子
Biomass Conversion and Biorefinery
·
2021
·Vol. 13
·期 10
·9045-9056
·
IF 4.987
Liu Peng,Xu Junming,Li Jing,Zhou Minghao,Shang Shibin,Zhao Jiaping,Jiang Jianchun
Triglycerides is a kind of natural oil widely existing in animals and plants, and it is also an ideal raw material for preparing biomass liquid fuel. Selectively hydrotreatment of unsaturated glyceride is an important strategy for the production of fuels and chemical feedstocks. In this work, catalytic hydrotreatment of triglycerides over Ni-based catalysts was investigated. Thus, an array of metal–organic frameworks derived Ni@C catalysts synthesized under different temperatures (350 °C, 400 °C, 450 °C) were prepared and applied for hydrotreatment of triglycerides. The highest conversion of triglycerides was 98.9% and the cracking rate could achieve 4.61% over the optimal Ni@C-BTC-400 catalyst in cyclohexane at 320 °C. The physicochemical characterizations were carried out by means of powder X-ray diffraction, scanning electronic microscopy, thermo gravimetric analyzer, N 2 adsorption–desorption, and Raman. Based on the optimal reaction condition (320 °C, 3 h, 3.0 MPa H 2 ), five typical vegetable oils and gutter oils were selected for the hydrotreatment study to investigate the adaptability of Ni@C-BTC-400 catalyst. The result indicated that Ni@C-BTC-400 catalyst performed good universality, and could transform oil raw materials with different fatty acid carbon chain structure to desired alkanes. Furthermore, the optimal Ni@C-BTC-400 catalyst could be carried out in next two consecutive recycling runs and could also be regenerated by H 2 for the following experiments.
研究领域:
能源科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Quanwang Zhong,Junwei Liao,Qian Zhang,Songbai Qiu,Qingwei Meng,Xiaoping Wu,Tiejun Wang
Developing biomass-derived fuels is a highly competent approach towards the current serious carbon emission issue caused by fossil fuel. The direct upgrading of the aqueous bio-ethanol to higher alcohols as diesel blending and bio-jet fuel precursors showed great potential in techno-economic. In this work, a water-tolerant Na-doped porous carbon encapsulated Ni nanocomposite was fabricated by direct pyrolyzing of Na-containing organic precursors for direct upgrading of aqueous ethanol. The higher alcohols yield of 35.0 C-mol% with C4-C7 selectivity of 51.9% and C8-C16 selectivity of 33.8% were achieved. The C4-C7 alcohols showed the excellent inter-miscibility with diesel at the 0–90% blending proportion. The C8-C16 higher alcohols with iso/n-OH (isomerized/normal alcohol) ratio of 1.86 can be directly used to produce desired jet fuel by hydrodeoxygenation treatment. Experiment and characterization results indicated that the Ni@C catalyst could spontaneously transfer from aqueous phase to the produced oil (higher alcohols) phase. The coupling of phase-transfer and basic sites of Ni@C-NaGlu effectively promoted the secondary C C coupling of higher alcohols to form C8-C16 alcohols. In general, this work provides a novel feasible approach to produce higher alcohol diesel blending and bio-jet fuel precursors from widely available bio-ethanol.
研究领域:
能源化学
·
催化化学
✓ 已验证
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2024
·Vol. 7
·期 6
·1-14
·
IF 23.2
Qiu Jiahang,Zhang Mu,Zhao Rongzhi,Sun Xudong,He Dianning
The quest for broadband electromagnetic wave absorption to satisfy the demands of various fields has emerged as a prominent research focus in the domain of electromagnetic wave absorption. By considering the effects of magnetic loss and polarization loss across different frequency bands, the development of composite materials incorporating magnetic metal particles and single metal atoms may facilitate an expansion of the electromagnetic wave absorption frequency range. Consequently, we synthesized FeCo@C/Ni@C composites derived from FeCo Prussian blue analogues and polydopamine through wet chemistry and pyrolysis methods. The chelation mechanism of polydopamine, combined with the physical barrier effect provided by Zn ions during synthesis, endows the FeCo@C/Ni@C composite with low-frequency magnetic loss characteristics from the FeCo alloy, high-frequency dipole polarization losses attributed to Ni atoms, and conductivity losses arising from the coupled carbon matrix. Ultimately, the composite exhibits exceptional electromagnetic wave absorption performance: at a thickness of 2.26 mm, it achieves a minimum reflection loss value of − 50.1 dB along with an effective absorption bandwidth reaching up to 6.0 GHz. In summary, this work presents a novel strategy for enhancing broadband absorption capabilities in electromagnetic wave absorbing materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2021
·Vol. 153
·期 6
·1666-1675
·
IF 3.186
Wang Yuan,Liu Shanshan,Zhang Yidong,Guo Qirui
Hydrogenation of biomass-derived furfuryl alcohol to widely used tetrahydrofurfuryl alcohol is an important industrial route, which however calls for a more efficient catalyst. In this work, a highly selective and stable Ni-C-Al 2 O 3 catalyst for furfuryl alcohol hydrogenation to tetrahydrofurfuryl alcohol is reported. The catalyst precursor is prepared by in-situ growth of Ni-based metal organic frameworks (Ni-BTC) on Al 2 O 3 and then the precursor undergoes thermal decomposition to obtain the catalyst directly. For comparison, Ni-C/Al 2 O 3 acquired from pyrolysis of physically mixed Ni-MOFs with Al 2 O 3 and Ni/Al 2 O 3 prepared by impregnation method are also tested as the hydrogenation catalysts. The prepared catalysts are characterized by a series of techniques, including XRD, FT-IR, TG, TEM, SEM, XPS and BET to reveal the relationship between the catalysts structure and their performance. The results show that small metal Ni particle size and appropriate interaction between Ni and the support, which benefit from the in-situ preparation method are key factors that ensure the high furfuryl alcohol conversion (99.8%) and high selectivity to tetrahydrofurfuryl alcohol (98.2%) at moderate reaction conditions (120 °C, 30 min, 4 MPa H 2 ). Graphical Abstract
研究领域:
催化化学
·
材料科学
·
生物质转化
✓ 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）