TRANSACTIONS OF TIANJIN UNIVERSITY
·
2018
·Vol. 25
·期 2
·143-151
·
IF 0
Du Jianzeng,Li Yonghong,Miao Zhenyu
Novel Ni/ZnO – HZSM-5 adsorbents were synthesized by incipient wetness impregnation. The Ni/ZnO – HZSM-5 adsorbent can achieve deep desulfurization and olefin aromatization at the same time. Thiophene sulfur was removed from 495 to less than 10 ppm via reactive adsorption desulfurization (RADS). Olefins were also converted into aromatics. HZSM-5 did not only support adsorbents but also cooperated with active Ni sites to catalyze olefins into aromatic hydrocarbons. Aromatization of 1-pentene, 2-pentene, 2-methyl-2-butene, and 1-hexene on adsorbents was investigated. The adsorbents were characterized by the Brunauer–Emmett–Teller, X-ray diffraction, temperature-programmed reduction, and temperature-programmed desorption of ammonia and thermogravimetric analysis. The experimental results showed that strong acids on the adsorbent disappeared after HZSM-5 loaded active metal sites, and almost no coke was generated on adsorbents in RADS.
✓ 已验证
产品关联
DOI
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Zihao Zhang,Zehua Pei,Hao Chen,Kequan Chen,Zhaoyin Hou,Xiuyang Lu,Pingkai Ouyang,Jie Fu
Al2O3-supported Cu and Ni monometallic as well as Cu–Ni bimetallic catalysts were synthesized using a coprecipitation method and studied for the in-situ hydrogenation of furfural (FAL) with isopropanol as the solvent and hydrogen donor. The Cu–Ni bimetallic catalysts showed improved activity toward the production of 2-methylfuran (2-MF) and 2-methyltetrahydrofuran (2-MTHF) over that of monometallic catalysts. The results indicated that isopropanol exhibited better performance than methanol for the in-situ hydrogenation of FAL to produce 2-MF and 2-MTHF under the same conditions. The reaction conditions such as the copper–nickel ratios, catalyst loading amount, reaction temperature, and time were optimized. After the reaction was complete, the supported Cu–Ni bimetallic catalyst could be reused four times without a significant loss in catalytic activity.
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2018
·Vol. 8
·期 7
·257
·
IF 3.465
Lin Li,Bo Jiang,Dawei Tang,Zhouwei Zheng,Cong Zhao
Chemical looping reforming (CLR) technique is a prospective option for hydrogen production. Improving oxygen mobility and sintering resistance are still the main challenges of the development of high-performance oxygen carriers (OCs) in the CLR process. This paper explores the performance of Ni/CeO2nanorod (NR) as an OC in CLR of ethanol. Various characterization methods such as N2adsorption-desorption, X-ray diffraction (XRD), Raman spectra, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), H2temperature-programmed reduction (TPR), and H2chemisorption were utilized to study the properties of fresh OCs. The characterization results show the Ni/CeO2-NR possesses high Ni dispersion, abundant oxygen vacancies, and strong metal-support interaction. The performance of prepared OCs was tested in a packed-bed reactor. H2selectivity of 80% was achieved by Ni/CeO2-NR in 10-cycle stability test. The small particle size and abundant oxygen vacancies contributed to the water gas shift reaction, improving the catalytic activity. The covered interfacial Ni atoms closely anchored on the underlying surface oxygen vacancies on the (111) facets of CeO2-NR, enhancing the anti-sintering capability. Moreover, the strong oxygen mobility of CeO2-NR also effectively eliminated surface coke on the Ni particle surface.Keywords:chemical looping reforming;hydrogen;oxygen carrier;CeO2;nanorod
✓ 已验证
产品关联
DOI
高影响因子
ChemCatChem
·
2018
·Vol. 10
·期 18
·4010-4017
·
IF 4.674
Kui Ma,Zhonghui Cui,Zhitao Zhang,Jingjing Huang,Zhirui Sun,Ye Tian,Tong Ding,Xingang Li
Graphical Blowing off steam : This paper describes a new approach of designing Cu−Ni bimetallic catalytic systems for dimethyl ether/methanol steam reforming. The Cu−Ni system exhibits an interesting alloy-mediated selectivity of CO and CH 4 , thereby producing hydrogen-rich reformates with an ultra-low CO concentration (<1000 ppm), which could be commercially potential for fuel cells. Steam reforming of simple oxygenated hydrocarbons without C−C bonds is suitable for small-scale decentralized H 2 production for fuel cells. However, the relatively high CO concentration in H 2 -rich reformates produced by traditional Cu-based catalysts will poison the Pt-based anode in fuel cells. Here, we describe a new approach to the design of Cu−Ni bimetallic catalysts based on nickel-phyllosilicate for steam reforming of dimethyl ether (DME). With the tunable formation of the Cu−Ni alloy, we can modulate the selectivity of CO and CH 4 in steam reforming and achieve H 2 -rich reformates with an ultra-low concentration of CO (below 1000 ppm). This process only requires simple and low-energy purification pretreatments to meet the requirements of commercial fuel cells. Mechanistic studies reveal that the Cu−Ni alloy can adsorb CO, particularly at high temperatures, and simultaneously suppress CO dissociation to methane.
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2018
·Vol. 8
·期 5
·182
·
IF 3.465
Feng Li,Jinrong Liang,Wenxi Zhu,Hua Song,Keliang Wang,Cuiqin Li
Ni/TiO2catalysts with different morphologies (granular, sheet, tubular and spherical) were prepared. Hydrogen was generated from ethanol aqueous-phase reforming over Ni/TiO2in a water-ethanol-m-chloronitrobenzene reaction system and directly applied intom-chloronitrobenzene catalytic hydrogenation. Thereby, in-situ liquid-phase hydrogenation ofm-chloronitrobenzene over Ni/TiO2without addition of molecular hydrogen was successful. Compared with granular, sheet and spherical Ni/TiO2, the nanotubular Ni/TiO2prepared from one-step hydrothermal reaction had larger specific surface area, smaller and uniformly-distributed pore sizes and more Lewis acid sites. In-situ liquid-phase hydrogenation ofm-chloronitrobenzene experiments showed the nanotubular Ni/TiO2had the highest catalytic activity, which was ascribed to both catalyst morphology and acid sites. Firstly, the nanotubular structure endowed the catalysts with a nanoscale confinement effect and thereby high catalytic performance. Secondly, the Lewis acid sites not only accelerated water–gas shift reaction, enhancing the ethanol aqueous-phase reforming activity for hydrogen generation, but also promoted the adsorption and hydrogenation of –NO2on the active sites of the catalysts.Keywords:Ni/TiO2;morphology effect;in-situ hydrogenation;aqueous-phase reforming;m-chloronitrobenzene
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2018
·
IF 2.21
Zhixiang Jiang,Yue Zhao,Ping Yang
Wire-in-tube and tube-in-tube structures have been prepared using single-spinneret electrospinning method through adjusting the preparation parameters of precursors and subsequent calcined process. Cobalt ferrite (CoFe 2 O 4 ) samples revealed wire-in-tube morphology using a Co/Fe molar ratio of 1/2. In the case of other a Co/Fe molar ratio, belt and porous fiber morphologies were created. Manganese ferrite (MnFe 2 O 4 ) sample exhibited tube-in-tube structure while nickel ferrite (NiFe 2 O 4 ) sample just exhibited tube structure. Because of no template in electrospun polymer composite nanofibers , the precursor diffusion process during calcination plays an important role for morphology controlling. The magnetic properties of samples were examined. The cobalt ferrite (CoFe 2 O 4 ) wire-in-tube sample revealed the highest saturation magnetization (60 emu/g). After growing with AlOOH on the surface, CoFe 2 O 4 wire-in-tube sample revealed a high efficiency for the removal of Congo red pollutant. These nanostructures are particularly attractive for use in the field of nano-fluidic and nano-energy harvesting devices.
✓ 已验证
产品关联
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2018
·
IF 3.972
Pengfang Zhang,Yun Xiao,Hui Sun,Xiaoping Dai,Xin Zhang,Haixia Su,Yuchen Qin,Daowei Gao,Axiang Jin,Hai Wang,Xiubing Wang,Shigang Sun
Morphology-controlled synthesis of metal–organic frameworks (MOFs) is of tremendous importance to understand the morphology–structure–property relationships. Although great emphasis has been placed on the controllable synthesis of MOFs, the preparation of hollow and nanoframe-like MOFs, especially using the microwave irradiation method, remains a great challenge. In the present work, we report microwave-assisted synthesis of hollow butterfly and ring zeolitic imidazolate framework-8 (ZIF-8) with the stimuli of Ni ions. Interestingly, the sphere, butterfly, and fiber ZIF-8 catalysts were also fabricated when adjusting the weight ratio of Zn and Ni resources. Specifically, sphere, butterfly, hollow butterfly, and ring particles have maintained the ZIF-8 structure. On the basis of the time sequential experiments, we inferred that the formation of hollow butterfly and ring particles is driven by the change of surface energy. The Knoevenagel reaction was carried out to explore the catalytic activity of these ZIF materials. The ring particles with ZIF-8 structure showed the highest catalytic activity. The open structure, thin walls, and the amount of basicity have been extensively discussed to shed light on the superior catalytic performance of ring particles.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2018
·
IF 2.829
Yanjun Liu,Ping Na,Jitao Chen,Yulong Xie
K 2 Zn 3 [Fe(CN) 6 ] 2 @ Ni-P (KNiP) composites with high cesium selectivity were synthesized for the first time. Nickel phosphorus (NiP) was used as a solid base for the adsorption of K 2 Zn 3 [Fe(CN) 6 ] 2 (KZnHCF). The synthesized KNiP composites were characterized by SEM, TEM, XRD , VSM and BET. The characteristic results demonstrated that the composites possess a ball-shape structure, a large surface area of 305.031 m 2 /g and high saturation magnetization of 2.95 emu/g. The ICP-OES analyser was used to determine the concentration of ions in this study. KNiP showed good cesium adsorption performance over a wide pH range and high selectivity for cesium over coexistent competing ions. Analysis of dynamics showed that KNiP has good adsorption performance toward cesium, with an adsorption capacity of 54.95 mg/g. Equilibrium was achieved within only two hours and the experimental data fit the Pseudo second-order model, indicating that the adsorption process was chemisorption . The adsorption process followed the Freundlich isotherm model, indicating that it mainly occured on a heterogeneous surface.
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2018
·
IF 3.525
Bing Zhang,Danping Hui,Yingxuan Li,He Zhao,Chuanyi Wang
The nickel-based complex Ni-CH 3 CH 2 NH 2 -intercalated niobate layered perovskite Ni-CH 3 CH 2 NH 2 /H 1.78 Sr 0.78 Bi 0.22 Nb 2 O 7 was synthesized via a facile in situ chemical reaction method. Using ultrathin H 1.78 Sr 0.78 Bi 0.22 Nb 2 O 7 nanosheets and nickel acetate as precursors. The composition, structure, photophysical properties, and photocatalytic activity for H 2 production of Ni-CH 3 CH 2 NH 2 /H 1.78 Sr 0.78 Bi 0.22 Nb 2 O 7 were studied systematically. The photocatalyst loaded with 0.5 wt% Ni exhibited the highest H 2 evolution rate of 372.67 μmo/h. This was 0.54 times higher than the activity of the H 1.78 Sr 0.78 Bi 0.22 Nb 2 O 7 nanosheets. The activity of the optimized Ni-CH 3 CH 2 NH 2 /H 1.78 Sr 0.78 Bi 0.22 Nb 2 O 7 was comparable to that of the Pt-loaded sample under the same reaction conditions. The photocatalytic activity of the Ni-CH 3 CH 2 NH 2 /H 1.78 Sr 0.78 Bi 0.22 Nb 2 O 7 was mainly attributed to the excellent separation of photogenerated carriers, after formation of the intercalated complex Ni-CH 3 CH 2 NH 2 . This study provides a facile strategy to synthesize a non-precious metal-loaded photocatalyst for H 2 production.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Mingyan Chen,Jie Chen,Yucheng Liu,Jie Liu,Lingli Li,Bing Yang,Lili Ma
A new type of metal organic framework GO/Ni-MOF-199 was synthesized using the solvothermal method in combination with different amounts of graphene oxide (0%, 0.5%, 1.75% and 5%) in order to remove thiophene from model oil. The adsorption desulfurization performance was tested by removing thiophene from the n-octane/thiophene model oil. The thermal stability of composites is improved by modification. Adsorption capacity of MOF-199 was enhanced by doping Ni 2+ and graphene oxide (GO) with appropriate content. Bimetallic ions combine with the oxygen-containing function of GO to form a stronger synergistic effect. The synthesized samples are characterized using XRD , SEM, FTIR, BET, and TGA methods. By using the appropriate characterization methods, it is shown that an excessive GO content will damage the structures of the composites. The investigation’s results demonstrated that the maximum adsorption capacity of 1.75% GO/Ni-MOF-199 reached 50.38 mgS/g MOF at 35 ℃, and a v (oil) /m (absorbent) ratio of 150 ml/g occurred after 3.5 h of adsorption. Furthermore, the 1.75% GO/Ni-MOF-199 composites could be reused at least four times. The pseudo-second-order dynamic model and Langmuir model are more suitable to represent how the GO/Ni-MOF-199 materials adsorb thiophene from the model oil.
✓ 已验证
产品关联
DOI
高影响因子
ACS Catalysis
·
2019
·
IF 12.221
Jian Li,Yaping Lin,Xiulian Pan,Dengyun Miao,Ding Ding,Yi Cui,Jinhu Dong,Xinhe Bao
Strong metal–support interaction (SMSI) has been widely recognized for platinum-group metals on reducible oxide supports. Herein we report that the catalytic activity of Ni catalyst in CO2 methanation is significantly suppressed over conventional anatase (a-TiO2) support due to the SMSI-induced formation of a titania overlayer around the Ni nanoparticles. Furthermore, CO is the only product . In contrast, the NH3-treatment and H2-treatment of the a-TiO2 support enhance remarkably the activity of Ni, i.e., CO2 conversion increases by 1 order of magnitude and CO2 is hydrogenated almost exclusively to CH4. X-ray photoelectron spectroscopy (XPS), H2 and CO chemisorption, and low temperature electron paramagnetic resonance (EPR) reveal that the enhanced CO2 methanation activity may be related with the Ti3+ species in the bulk that are generated by reduction treatment, which likely have altered the SMSI between Ni and a-TiO2 support. This simple reduction treatment approach may be applicable to modulate the SMSI of other reducible oxide-supported metal catalysts.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2018
·Vol. 26
·期 3
·819-828
·
IF 1.858
Tao Jianli,Liu Lujuan,Zhu Peihong,Zhai Kang,Ma Qian,Zhang Danning,Ma Jie,Zhai Yunpu,Liu Yonggang,Zhang Ruiqin
A Ni-based cage-like C–SiO 2 –Al 2 O 3 (Ni/CL-CSA) catalyst was synthesized successfully via a facile dual-templating method and used for the hydrotreatment of phenol. The catalyst was characterized by SEM, TEM, XRD, TG and N 2 adsorption techniques. Results show that Ni/CL-CSA has three-dimensional connected macroporous structure with pore size of about 100 nm and ordered mesoporous windows with average pore size of approximately 3.8 nm. Size of nickel particle is 6.1 nm. BET surface area of the catalyst is 212 m 2 /g and pore volume is 0.24 cm 3 /g. Hydrogenation and the stability performance of the catalyst was studied for bio-oil model compound phenol. Results reveal that adding macropores into Ni-based mesoporous C–SiO 2 –Al 2 O 3 (Ni/MP-CSA) can improve the mass transfer rate and reduce the particles growth, thus improve the catalytic activities in the hydrotreatment of phenol, reducing catalyst sintering at high temperature and improving the stability of the catalyst.
✓ 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）