JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2023
·
IF 6
Dayi Guo,Bo Cai,Rui Kang,Shuai Wang,Junfeng Feng,Hui Pan
Hydrodeoxygenation is one of the key steps to upgrade of biomass derived bio-oil into valuable biofuels and chemicals. Developing of highly reactive and cost-effective catalysts for bio-oil hydrodeoxygenation is highly desired. Layered Ni x Co y Al z catalyst was prepared using layered double hydroxide (LDH) as the precursors. The optimized Ni 1 Co 3 Al 2 -600 catalyst exhibits excellent catalytic performance for guaiacol hydrodeoxygenation. Guaiacol could completely converted with 90.0% of cyclohexanol selectivity under relatively mild reaction conditions. The XRD and HRTEM characterizations of the as prepared catalysts confirmed the formation of Ni-Co alloy and the XPS analysis revealed the strong interaction between Al species with both Ni and Co in catalyst Ni 1 Co 3 Al 2 -600, which should contribute to its high catalytic activity for guaiacol hydrodeoxygenation. Catalyst Ni 1 Co 3 Al 2 -600 also demonstrated excellent versatility for the hydrodeoxygenation reactions of guaiacyl and syringyl compounds as well as high stability. The results from this work could provide a new approach for the constructing of effective catalysts from non-noble metal LDHs.
研究领域:
能源化学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Chongjie Zhang,Xiang Xu,Niyu Yao,Chunhao Wang,Juan Guan,Zheng Zeng,Liqing Li
Environmental problems caused by the utilization of fossil energy are becoming more and more serious, so now more attention has been paid to the use of renewable energy. Pyrolysis of biomass is a method that convert biomass energy into hydrogen, but this method is subject to the performance of the catalyst for the pyrolytic reaction. In this study, NiCo 2 O 4 was synthesized by coprecipitation method and examined by microstructure and textual characterizations. The ability of NiCo 2 O 4 to pyrolyze toluene and produce hydrogen was evaluated by temperature-programmed experiment and lifetime test. It was found that the sample could pyrolyze toluene at the concentration of 1500 ppm at 300 °C with a hydrogen production of 0.6%, suggesting toluene was completely pyrolyzed. In the longevity test, toluene can be completely pyrolyzed for at least 5 h at 400 °C, with a high hydrogen yield of above 80% maintained during the pyrolysis process. As the pyrolysis reaction progresses, NiCo 2 O 4 was gradually reduced to nickel-cobalt alloy by hydrogen from the pyrolysis of toluene, indicating the actual active site of nickel-cobalt alloy. This study gives a hint for developing a good catalyst for the ultra-low temperature biomass pyrolysis to produce hydrogen.
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
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Jiaming Wang,Huixian Zhong,Kang An,Qiang Liu,Wu Jin,Yuan Liu
In this work, Ni–Co alloy nanoparticles (NPs) on La-doped SiO2 showed excellent selectivity toward ethanol for direct ethanol synthesis via CO hydrogenation. Over the catalyst with an optimal ratio of Ni/Co, the total alcohol selectivity reached 33.5%, of which ethanol occupied 47.0 wt %. The results demonstrated that the interaction between Co and Ni improved the ability to activate H2 and CO and adjusted the amount of the dissociatively and associatively adsorbed CO. Besides, the mutual dilution of nickel and cobalt in Ni–Co alloy NPs effectively reduced the isolated Co or Ni-clusters; thus, the formation of heavy hydrocarbons was suppressed. In the reaction process, Ni@Co–Co2C, a core–shell composite with a nickel core and Co–Co2C shell, was formed, which suppressed the loss of nickel species. Moreover, with the reaction going on, a small amount of poorly alloyed Co-clusters would be covered gradually by the formed coke, resulting in an increase in alcohol selectivity.
研究领域:
催化化学
·
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Baosong Li,Weiwei Zhang,Dandan Li
Ni–Co and Ni–Co/ZrO 2 composite coatings have been synthesized via a single-step direct current (DC) electrodeposition route as a protective coating. The influences of electrodeposition current density, time and ZrO 2 concentration on structural, composition and properties of Ni–Co coating were investigated. All coatings present compact, crack-free and nodular-like morphology in a nanocrystalline structure. Some aggregations still exist in the coating. The preferred orientation of these coatings changed from (200) to (111) texture with a fcc structure . The amount of Co in Ni–Co matrix slightly decreases as current density and time increases. The Co and ZrO 2 content in Ni–Co/ZrO 2 matrix increase with the increasing of ZrO 2 concentration in bath. Less than 60 min is beneficial for low roughness of Ni–Co/ZrO 2 coating. Current density, deposition time and ZrO 2 embedded in metallic matrix affect the hardness of Ni–Co alloy. Ni–Co/ZrO 2 coating has enhanced hardness compared to Ni–Co ones. Although they might not exhibit the best corrosion resistance in the initial immersing stage, Ni–Co/ZrO 2 composite coating obtained at 2 – 4 A dm −2 with 5–10 g L -1 ZrO 2 presents the better corrosion resistance and desirable performance stability during the long-term immersion process in aggressive media. The Ni–Co/ZrO 2 coating exhibits promising advantages as a protective coating.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CORROSION
·
2023
·Vol. 80
·期 2
·187-196
·
IF 1.6
Li Bowen,Pan Fengze,Pan Chengyu,Lv Tianyi,Wang Xiaotian,Ju Xiang,Gong Kaifei,Zou Wenkai,Zheng Chuanbo
The Ag-Ni-Co alloy coating is prepared in the low eutectic solvent system by pulsed power supply technology. Infrared spectroscopy and cyclic voltammetry are used to confirm that the addition of metal salts does not change the low eutectic solvent system. When the current density is 1 A/dm 2 and the plating time is 40 min, the plating grain is mainly spherical; the coating is uniform and dense. After testing, the surface-specific resistance of the plating is only 1.295 mΩ·cm 2 , the microhardness reaches 214.8 HV, and the wear rate reaches 3.1. The corrosion resistance of the plating and the substrate is analyzed by a combination of macroscopic electrochemistry and microarea electrochemistry, and the results show that the corrosion potential of the plating reaches −0.141 V, and the corrosion current density reaches 1.299 × 10 −7 A/cm 2 . The corrosion resistance of the plating is much greater than that of the substrate.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2023
·Vol. 136
·期 2
·937-952
·
IF 1.8
Zhang Xing,Wang Zhongze,Shu Sihao,Liu Shengnan,Wang Dandan,Chen Jixiang
ZrO 2 -supported Ni and Ni-Co alloy catalysts were synthesized by co-precipitation method and tested for the hydrogenation of phenol in aqueous phase. Cyclohexanol and cyclohexanone are dominatingly generated on all the catalysts, and the deoxygenation products are minor. The Ni-Co alloy gives higher phenol conversion and the total yield of cyclohexanol and cyclohexanone compared to the metallic Ni. This is attributed to high metal dispersion due to the formation of Ni-Co alloy and the synergetic effect of Ni and Co in the alloy. ZrO 2 -supported Ni-Co alloy with the Ni/Co atomic ratio of 1 and the metal mass loading of 15% possesses the best performance. The total yield of cyclohexanol and cyclohexanone reaches 91.3% with the cyclohexanol/cyclohexanone molar ratio of 2.79. The phase composition of ZrO 2 -supported Ni-Co alloy remains stable during recycling, while the slight sintering of ZrO 2 and Ni-Co alloy particles can account for the catalyst deactivation. It has also been found that the presence of water may facilitate the keto-enol tautomerization and stabilize the ketone intermediates, leading to higher cyclohexanone yield than using n-octane as solvent.
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
NANO
·
2016
·
IF 0.951
Jingge Liu,Ang Cao,Jing Si,Lihong Zhang,Qinglan Hao,Yuan Liu
Sintering of the active metallic nanoparticles and carbon deposition are the key problems faced for CO methanation catalysts. For overcoming those problems, bimetallic nanocatalyst is a promising route. In this work, a series of Al 2 O 3 supported Ni-Co alloy catalysts were prepared by reducing NiCoAl layered double hydrotalcite (LDHs), and characterized with X-ray diffraction (XRD), temperature programmed reduction TPR, N 2 adsorption-desorption, transmission electron microscopy (TEM) and temperature programed oxidation (TPO) techniques. The resultant catalysts were mesoporous with nanoparticles of Ni-Co alloy ranging from 7.9 nm to 9.2 nm which were highly dispersed in alumina matrix. The sample Ni 7 Co 3 -Al 2 O 3 catalysts showed very good catalytic performance during the stability test at 500/600 ∘ C for 300 h, meanwhile exhibited excellent anti-sintering ability and anti-carbon deposition ability, owing to the formation of Ni-Co alloy and the feature of LDHs. This strategy for improving anti-sintering and anti-carbon deposition should be extendable for catalysts of other reactions.
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
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Bin Li,Xiaoqing Yuan,Lvyin Li,Xiujun Wang,Baitao Li
Alloying nickel with a transition metal and further stabilizing an active metal on bimodal support are regarded as a promising strategy to improve carbon resistance for dry reforming of methane (DRM) reaction. In this work, a bimodal mesoporous alumina-supported Ni-Co alloy catalyst (NiCo/MMAl) was prepared via the evaporation-induced self-assembly method and employed to catalyze DRM reaction. The promotive effect of Ni-Co alloy with a bimodal porous structure on the carbon resistance was investigated. The presence of Ni-Co alloy was confirmed on porous alumina. The NiCo/MMAl catalyst possessed two porous structures, a small-sized mesopore at 10 nm and a large-sized one at 40 nm. NiCo/MMAl exhibited enhanced carbon resistance, in which only 2.3% carbon formed on the catalyst surface, lower than a unimodal mesoporous alumina-supported NiCo catalyst (NiCo/MAl, 12%) and Ni catalyst (Ni/MAl, 24%). The kinetic study suggested that on the unimodal mesoporous alumina, alloying Ni with Co increased the activation energy of CH4 dissociation (∼66 kJ/mol) compared to Ni/MAl (51.7 kJ/mol), thus showing high activity for suppressing CH4 dissociation. In addition, the large-sized mesoporous structure on NiCo/MMAl favored mass transport. As a result, the enhanced carbon resistance for NiCo/MMAl was not only attributed to the suppression of CH4 dissociation by Ni-Co alloy but also to the promotive effect of the large-sized mesopore structure on enhancing mass transport.
研究领域:
催化化学
·
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2021
·
IF 8.271
Dongdong Wang,Wanbing Gong,Jifang Zhang,Miaomiao Han,Chun Chen,Yunxia Zhang,Guozhong Wang,Haimin Zhang,Huijun Zhao
Catalytic hydrodeoxygenation (HDO) is one of the most promising strategies to transform oxygen-rich biomass derivatives into high value-added chemicals and fuels, but highly challenging due to the lack of highly efficient nonprecious metal catalysts. Herein, we report for the first time of a facile synthetic approach to controllably fabricate well-defined Ni-Co alloy NPs confined on the tip of N-CNTs as HDO catalyst. The resultant Ni-Co alloy catalyst possesses outstanding HDO performance towards biomass-derived vanillin into 2-methoxy-4-methylphenol in water with 100% conversion efficiency and selectivity under mild reaction conditions, surpassing the reported high performance nonprecious HDO catalysts. Impressively, our experimental results also unveil that the Ni-Co alloy catalyst can be generically applied to catalyze HDO of vanillin derivatives and other aromatic aldehydes in water with 100% conversion efficiency and over 90% selectivity. Importantly, our DFT calculations and experimental results confirm that the achieved outstanding HDO catalytic performance is due to the greatly promoted selective adsorption and activation of C=O, and desorption of the activated hydrogen species by the synergism of the alloyed Ni-Co NPs . The findings of this work affords a new strategy to design and develop efficient transition metal-based catalysts for HDO reactions in water.
研究领域:
催化化学
·
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2021
·Vol. 16
·期 4
·443-460
·
IF 4.204
Shi Yinteng,Ai Lin,Shi Haonan,Gu Xiaoyu,Han Yujun,Chen Jixiang
Carbon-coated Ni, Co and Ni-Co alloy catalysts were prepared by the carbonization of the metal doped resorcinol-formaldehyde resins synthesized by the one-pot extended Stöber method. It was found that the introduction of Co remarkably reduced the carbon microsphere size. The metallic Ni, Co, and Ni-Co alloy particles (mainly 10–12 nm) were uniformly distributed in carbon microspheres. A charge transfer from Ni to Co appeared in the Ni-Co alloy. Compared with those of metallic Ni and Co, the d -band center of the Ni-Co alloy shifted away from and toward the Fermi level, respectively. In the in-situ aqueous phase hydrodeoxygenation of methyl palmitate with methanol as the hydrogen donor at 330 °C, the decarbonylation/decarboxylation pathway dominated on all catalysts. The Ni-Co@C catalysts gave higher activity than the Ni@C and Co@C catalysts, and the yields of n -pentadecane and n -C 6 - n -C 16 reached 71.6% and 92.6%, respectively. The excellent performance of Ni-Co@C is attributed to the electronic interactions between Ni and Co and the small carbon microspheres. Due to the confinement effect of carbon, the metal particles showed high resistance to sintering under harsh hydrothermal conditions. Catalyst deactivation is due to the carbonaceous deposition, and the regeneration with CO 2 recovered the catalyst reactivity.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Zifan Wu,Yacong Deng,Fengyu Tian,Yidi Wang,Na Fan,Guangzheng Sun,Yichuan Li,Yuan Pan,Bin Liu,Bin Dong,Han Hu,Yongming Chai
During the fermentation of straw to produce bioethanol, enzymatic hydrolysis lignin (EHL) is generated in significant quantities, which retains the original structure of lignin and thus exhibits a great potential for the production of monophenols. Herein, we fabricated a highly dispersed Ni-Co alloy catalyst loaded on N-doped biochar (10Ni-3Co/NAC) by a deposition precipitation method, which could completely convert α-O-4, β-O-4, and 4-O-5 lignin model compounds into monomers under mild conditions. 10Ni-3Co/NAC significantly catalyzed the hydrocracking of EHL in water at 220 °C under 3 MPa of initial hydrogen pressure for 8h, achieving a total monophenol yield of 42.8 wt% and a high 2,6-dimethoxy-4-propylphenol proportion (48.5 %). The study results suggest that 10Ni-3Co/NAC possesses high adsorption and activation capacity for oxygen-containing substrates, and the interspecies electron transfer within Ni-Co alloys in 10Ni-3Co/NAC facilitates the formation of dissociated active hydrogen, which attacks the C-O group in EHL leading in the highly selective cleavage of the C-O bond to produce monophenols.
研究领域:
化学工程
·
可再生资源利用
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2023
·
IF 17.1
Wanbing Gong,Xin Mao,Jifang Zhang,Yue Lin,Haimin Zhang,Aijun Du,Yujie Xiong,Huijun Zhao
In theory, electrocatalysts in their metallic forms should be the most stable chemical state under cathodic potentials. It is known that the highly dispersed nanoparticle (NP) types of electrocatalysts often possess higher activity than their bulk counterparts. However, facilely and controllably fabricating well-dispersed nonprecious metal NPs with superior electrocatalytic activity, selectivity, and durability is highly challenging. Here, we report a facile reductive pyrolysis approach to controllably synthesize NiCo alloy NPs confined on the tip of N-doped carbon nanotubes (N-CNTs) from a bimetal-MOF precursor. The electrocatalytic performance of the resultant NiCo@N-CNTs are evaluated by a wide spectrum of nitroarene reductive coupling reactions to produce azoxy-benzenes, a class of precious chemicals for textile, food, cosmetic, and pharmaceutical industries. The superior electrocatalytic stability, full conversion of nitroarenes, >99% selectivities, and >97% faradic efficiencies toward the targeted azoxy-benzene products are readily attainable by NiCo@N-CNTs, attributable to the alloying-induced synergetic effect. The presence of a CNT confinement effect in NiCo@N-CNTs induces high stability. This added to the metallic states of NiCo empowers NiCo@N-CNTs with excellent electrochemical stability under reductive reaction conditions. In an effort to enhance the energy utilization efficiency, we construct a NiCo@N-CNTs||Ni(OH)2/NF two-electrode electrolyzer to simultaneously reduce nitrobenzene at the cathode and 5-hydroxymethylfurfural with >99% yields for both azoxy-benzene and 2,5-furandicarboxylic acid.
研究领域:
材料科学
·
电化学
·
催化反应
✓ 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）