Energy Technology
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2018
·Vol. 7
·期 3
·1800694
·
IF 3.175
Chen Zhu,Jing-Pei Cao,Tao Xie,Xiao-Yan Zhao,Xin Cui,Zhen-Xing Guo,Wen-Zhong Shen,Jin Bai,Xian-Yong Wei
The influence of the type of support [activated carbon (AC), HZSM-5, and γ-Al 2 O 3 ] on the performance of Ni-based catalysts for the catalytic hydrogenolysis (CH) of benzyl phenyl ether (BPE) is investigated. The properties of an Ni-based catalyst are investigated using diverse characterization techniques. An Ni/AC catalyst exhibits the highest dispersion of Ni atoms by CO pulse. The kinetic studies show that the apparent activation energies ( E a ) for CH of BPE increase in the order E a (Ni/AC) < E a (Ni/γ-Al 2 O 3 ) < E a (Ni/HZSM-5), and the initial turnover frequencies follow the order of Ni/AC (64 mol mol Nisurf −1 h −1 ) > Ni/γ-Al 2 O 3 (58 mol mol Nisurf −1 h −1 ) > Ni/HZSM-5 (45 mol mol Nisurf −1 h −1 ). All these results prove that the CH activity of BPE is significantly affected by the type of support, and Ni/AC is the highest activity catalyst in CH of the C—O bond of BPE. Toluene and phenol are major products in CH of BPE at a relatively low hydrogen pressure and high temperature. Based on catalytic experiments, a reaction mechanism is proposed, which provides the theoretical basis for converting lignite into high-value organic molecules.
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CHEMICAL COMMUNICATIONS
·
2013
·Vol. 49
·期 46
·5328-5330
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IF 6.378
Zhen Yang,Yao-Bing Huang,Qing-Xiang Guo,Yao Fu
A catalytic transfer hydrogenation process was developed for the production of γ-valerolactone (GVL) from ethyl levulinate (EL) and a H-donor at room temperature. Ethyl levulinate was almost quantitatively converted to γ-valerolactone. Further, a two step process for producing GVL from biomass derived platform molecules was also reported.
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PubMed
高影响因子
JOURNAL OF MATERIALS RESEARCH
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2014
·Vol. 29
·期 22
·2657-2666
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IF 1.815
Xiao Hu,Y.C. Chan
To reinforce the reliability issue brought by excessive interfacial reaction with the dimensional scale-down of electronic device, an electroless Ni–P–ZrO2 (17.5 at.% of P) composite coating was developed as the under bump metallization (UBM) for lead-free solder interconnect. ZrO2 nanoparticles were proved to be homogeneously distributed and helped improve wetting ability of the layer. Both Sn–3.5Ag/Ni–P–ZrO2 and Sn–3.5Ag/Ni–P solder joints were prepared and aged at various conditions to study the interfacial reaction. Growth of intermetallic compounds (IMCs) without serious spalling in solder/Ni–P–ZrO2 joint was slowed down because of the barrier property of incorporation of ZrO2 nanoparticles, which blocked the diffusion of Ni and Cu atoms. Based on the IMC growth, the activation energy of solder/Ni–P–ZrO2 was estimated to be higher than that of plain solder joint. The top-view of IMCs demonstrated a much finer grain size compared with that of solder/Ni–P joint. A reactive diffusion-induced compound formation mechanism was proposed to address the microstructural evolution in detail. Moreover, solder/Ni–P–ZrO2 joint demonstrated higher shear strength than did solder/Ni–P joint for different aging durations. The fracture surface of solder/Ni–P joint after shear test showed ductile transition failure, with big dimples and plastic deformation.
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RSC Advances
·
2015
·Vol. 5
·期 110
·90904-90912
·
IF 3.84
Yueling Cao,Junwei Wang,Maoqing Kang,Yulei Zhu
Hydrogenolysis of glucose and cellobiose, used as the model feedstocks, over Ni–WO3/SBA-15 catalysts has been investigated to probe the influencing factors for the conversion of cellulose to ethylene glycol (EG). The conversion of glucose and cellobiose to EG showed different dependencies on reaction temperature; a lower reaction temperature was needed for the former. Additionally, the surface atomic ratio of W to Ni on the Ni–WO3/SBA-15 catalysts was the key factor for the product distribution. Both glucose and cellobiose had their own optimum W–Ni ratio for the production of EG, and the ratio of W to Ni for glucose was slightly lower than that of cellobiose. On the other hand, the Ni–WO3/SBA-15 catalysts were thoroughly characterized by N2 adsorption–desorption, X-ray diffraction (XRD), hydrogen-temperature programmed reduction (H2-TPR), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). The results indicated that the reducibility of Ni–WO3/SBA-15 catalysts with high Ni loading was more similar to that of pure NiO. More importantly, the change of surface atomic content of Ni and W of Ni–WO3 catalysts with various Ni loadings resulted from the surface W species of the catalysts being gradually covered by Ni species with the increase of Ni loading.
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APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Chao Gong,Miaoliang Huang,Pei Zhou,Zhixian Sun,Leqing Fan,Jianming Lin,Jihuai Wu
Mesoporous Co 0.85 Se nanosheets on Ni foam for high-performance supercapacitors were prepared by a facile one-step hydrothermal method. The as-synthesized Co 0.85 Se electrodes possess high pseudocapacitive performance with large specific capacitance and excellent cycling stability. The specific capacitance can achieve a maximum of 1378 F g −1 at a current density of 1 A g −1 , which can still keep 95.5% of capacitance retention after 1000 cycles. Then, an asymmetric supercapacitor was fabricated by using Co 0.85 Se nanosheets as positive material and activated carbon (AC) as negative material. The asymmetric configuration can extend voltage window to 1.6 V, which lead to a significant increase in the energy density to 39.7 W h kg −1 at a power density of 789.6 W kg −1 , couples with outstanding cycle stability. The results demonstrate that the mesoporous Co 0.85 Se nanosheets are promising electrode materials for supercapacitors.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2015
·
IF 3.313
Lei Wang,Pengjin Ye,Fang Yuan,Shuzhen Li,Zixin Ye
In this work, we report a novel means, named liquid phase in-situ hydrodeoxygenation of bio-derived phenol to cyclohexene and cyclohexane over Raney Ni and Nafion/SiO 2 . In this method, producing hydrogen , hydrogenation and dehydration are merged and coupled owing to the close reaction conditions. The overall specific reaction pathway was studied and influences of Nafion loading, temperature, H 2 O/MeOH ratio and the quantity of catalysts on the reaction were also researched. In terms of 3 g phenol, the suitable operating conditions are drawn as follows: the Nafion loading 13 wt%, the reaction temperature 200 °C, H 2 O/MeOH ratio 20 mL:15 mL, Raney Ni 1 g, Nafion/SiO 2 0.3 g. The conversion rate of phenol and the total yield of cyclohexene and cyclohexane can reach respectively 100% and 87%. The whole reaction system is performed in the liquid phase using in situ hydrogen produced from methanol aqueous-phase reforming, not requiring an external source of hydrogen. The operating conditions are gentle, and the cost is considerably reduced.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2015
·
IF 2.999
Qian Qi,Yan Liu,Hui Zhang,Yinsheng Li,Hanqin Liang,Zhengren Huang
SiC p /Hastelloy composites were fabricated by pressureless Ti-activated infiltration process. The wetting and infiltration behaviors of Hastelloy on the SiC substrates and the interfacial reaction between the SiC particles and Hastelloy were investigated by real-time observation system, X-ray diffraction (XRD) and scanning electron microscopy (SEM) equipped with energy X-ray dispersive spectroscopy (EDS) system. The results demonstrated that the Hastelloy had a good wettability on SiC ceramic and could spontaneously infiltrate into the Ti-activated SiC preform. Moreover, intensive interfacial reaction similar to SiC/Ni system was found between the SiC particles and Hastelloy, which induced defects in the microstructure. In order to inhibit the interfacial reaction, Al 2 O 3 coating on SiC particles was adopted as a diffusion barrier, which effectively reduced the extent of the interfacial reactions.
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ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Xinhong Qi,Xiangcun Li,Bo Chen,Huilan Lu,Le Wang,Gaohong He
Catalyst-containing nanoreactors have attracted considerable attention for specific applications. Here, we initially report preparation of PtNi@SiO2 hollow microspheres based on confined catalysis. The previous encapsulation of dispersed Pt nanoparticles (NPs) in hollow silica microspheres ensures the formation of Pt@Ni coreshell NPs inside the silica porous shell. Thus, the Pt NPs not only catalyze the reduction of Ni ions but also direct Ni deposition on the Pt cores to obtain Pt@Ni core–shell catalyst. It is worthy to point out that this synthetic approach helps to form a patchlike or thick Ni coating on Pt cores by controlling the penetration time of Ni ions from the bulk solution into the SiO2 microspheres (0.5, 1, 2, or 4 h). Notably, the Pt@Ni core–shell NPs with a patch-like Ni layer on Pt cores (0.5 and 1 h) show a higher H2 generation rate of 1221–1475 H2 mL min–1 g–1cat than the Pt@Ni NPs with a thick Ni layer (2 and 4 h, 920–1183 H2 mL min–1 g–1cat), and much higher than that of pure Pt NPs (224 H2 mL min–1 g–1cat). In addition, the catalyst possesses good stability and recyclability for H2 generation. The Pt@Ni core–shell NPs confined inside silica nanocapsules, with well-defined compositions and morphologies, high H2 generation rate, and recyclability, should be an ideal catalyst for specific applications in liquid phase reaction.
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Materials Today
·
2017
·
IF 21.695
Donghui Wang,Feng Peng,Jinhua Li,Yuqin Qiao,Qianwen Li,Xuanyong Liu
The selective tumor- and bacteria-killing property is promising for biomedical implants in directly contact with tumor tissue but still presents a considerable challenge. In this study, a butyrate-inserted Ni–Ti layered double hydroxide film (LDH/Butyrate) is prepared on the surface of nitinol alloy via a simple hydrothermal treatment. The prepared film can selectively inhibit tumor growth and metastasis and bacterial infection by taking advantage of the overproduced H 2 O 2 in tumor and infection microenvironments: the pro-tumor and pro-infection molecule H 2 O 2 can be consumed by LDH/Butyrate, and cytotoxic butyrate inserted in LDH/Butyrate is subsequently exchanged out. Such a novel endogenous stimuli-responsive platform is expected to prevent tumor overgrowth, metastasis and bacterial infection and will find a promising application in the design of localized drug-eluting systems.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2016
·
IF 3.205
Zhiming Gao,Lin Cui,Hongwei Ma
Four methods were adopted to prepare samples 20%NiO/Al 2 O 3 with calcination fixed at 500 °C, which were then reduced into 20%Ni/Al 2 O 3 and used as catalysts for reaction of selective methanation of CO in H 2 -rich gas (CO-SMET). XRD and TPR measurements indicate that nickel aluminates were formed in the calcined samples and their formation was influenced by preparation methods. Higher temperatures were required to reduce the calcined samples more efficiently and to achieve a higher catalytic activity for CO-SMET. Among the four methods, the precipitation method using ammonium carbonate as precipitant produced the highest catalytic activity both for CO methanation and for CO 2 methanation after reduction at 800 °C for 2 h. The calcined sample 20%NiO/Al 2 O 3 prepared with the method was therefore used as support and impregnated with Ru 3+ solution. Ru addition promoted reduction of Ni 2+ ions in the calcined sample even at the low temperatures of 400 °C and 500 °C. The catalyst 1%Ru–20%Ni/Al 2 O 3 reduced at 500 °C thus had a superior performance, removing CO to ca. 30 ppm with a selectivity as high as 75% at reaction temperature of 220 °C.
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JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
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2016
·
IF 2.357
Lindong Li,Xingliang Chen,Shuhua Qi
The composite of hollow glass microspheres (HMG) coated by Ni 0.7 Zn 0.3 Fe 2 O 4 particles was fabricated via sol–gel method, and then the ternary composite (HMG/Ni 0.7 Zn 0.3 Fe 2 O 4 /PT) was synthesized by in situ polymerization. The electrical property, magnetic performance and reflection loss of the composites were measured, and the results suggest that the conductivity and the saturation magnetization (Ms) of HMG/Ni 0.7 Zn 0.3 Fe 2 O 4 /PT reach 6.87×10 −5 S/cm and 11.627 emu/g, respectively. The ternary composite has good microwave absorbing properties ( R min =−13.79 dB at 10.51 GHz) and the bandwidth less than −10 dB can reach 2.6 GHz (from 9.4 to 12.0 GHz) in X band (8.2–12.4 GHz). The morphology and chemical structure of the samples were measured through scanning electron microscopy (SEM), X-Ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). This paper also analyzes the relationship between the reflection loss of the absorber and its thickness.
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RSC Advances
·
2016
·Vol. 6
·期 56
·51221-51228
·
IF 3.289
Yanliang Yang,Jiping Ma,Xiuquan Jia,Zhongtian Du,Ying Duan,Jie Xu
Al2O3 modified by alkaline earth metals M–Al2O3 (M = Mg, Ca, Sr, Ba) was synthesised by coprecipitation method. The nickel-based catalysts supported by M–Al2O3 were prepared by impregnation method. The catalysts were characterized by TEM, N2 adsorption/desorption, XRD, H2-TPR, NH3-TPD and XPS, and used for the direct hydrogenation of furfural to tetrahydrofurfuryl alcohol (THFA) in water. The reaction was demonstrated to proceed through furfuryl alcohol as an intermediate. The modification of Al2O3 by alkaline earth metals has a significant effect on the activity and selectivity of THFA. A high yield of THFA was obtained over Ni/Ba–Al2O3 under optimized conditions. Moreover, the catalyst is recyclable and reusable at least four times without significant loss of the conversion of furfural and selectivity of THFA.
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