APPLIED CATALYSIS A-GENERAL
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2023
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IF 5.5
Shaoqing Wang,Yan Jiao,Zhihe Li,Zhen Wan,Yu Han,Weiming Yi
In this paper, a surface encapsulation method has been developed to synthesize the HZSM-5 @Al-KIT-6 hierarchical zeolites, due to the poor mono-aromatic hydrocarbons (MAHs) selectivity and rapid coke deactivation during the catalytic upgrading lignin pyrolysis vapors. Results showed that the acidity and accessibility of HZSM-5 @Al-KIT-6 hierarchical zeolite can be modulated by changing the TEOS/HZSM-5 mass ratio during catalyst synthesis. The three-dimensional (3-D) cubic mesoporous shell can capture the bulky phenolic oligomers and pre-crack for further reforming. The highest MAH content (44.03%) and lower polycyclic aromatic hydrocarbons (PAHs) (23.79%) were produced when the TEOS/HZSM-5 mass ratio was 1.0. The hierarchical zeolites improved the yield of xylenes due to the enhanced alkylation reaction. In addition, the micro-mesoporous highway reduced the formation of coke deposition. The catalytic mechanism of hierarchical zeolites was then proposed based on the obtained results. This study provides a reference for pilot-scale experiments for the catalytic upgrading lignin pyrolysis vapors.
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JOURNAL OF CATALYSIS
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2019
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IF 7.723
Habib Ullah,Bibimaryam Mousavi,Hussein A. Younus,Zafar A.K. Khattak,Suleman Suleman,Muhammad T. Jan,Baoyi Yu,Somboon Chaemchuen,Francis Verpoort
Carbon dioxide , the main cause of environmental pollution, its utilization to produce valuable products is of utmost interest. A series ONO pincer hydrazone based most active mono-nuclear Al(III) complexes were successfully synthesized and characterized with the help of NMR, IR, mass spectrometry and only complex 2a was confirmed by single-crystal analysis. The synthesized Al(III) complexes were then employed as capable catalysts for the solvent-free chemical fixation of CO 2 with epoxides at atmospheric pressure and could be reused five times without loss of any catalytic activity. In addition, the catalytic mechanism was investigated by analyzing intermediates via 1 H NMR, 13 C NMR, and mass MALDI-TOF. The excellent catalytic performance could be due to simultaneous attack and the opening of the epoxide by metal centers to form an alkoxide ion which activates the CO 2 the same time.
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Advances in Applied Ceramics
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2018
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IF 1.092
Kuibao Zhang,Dan Yin,Xirui Lu,Haibin Zhang
In this study, the zirconolite-rich composite was rapidly synthesised from self-propagating high-temperature synthesis plus quick pressing using MoO3 as the oxidant and Ti as the reductant. As a surrogate of trivalent actinides, Nd was introduced to substitute the Ca site of zirconolite and Al was employed as the charge compensator to replace the Ti site (nominally Ca1−xNdxZrTi2−xAlxO7). The phase composition and Nd occupancy were analysed after Nd2O3 addition. Nd-bearing zirconolite was produced as the major ceramic phase. Nd mostly substitutes the Ca sites of zirconolite, which results in waste loading higher than 8.6 wt-% Nd. The aqueous durability of Nd–Al codoped sample (with 15 at.-% Nd substitutes the Ca site of zirconolite) was evaluated at 90°C as well. The 42 days normalised leaching rates of Mo, Ca and Nd were measured to be 3.70, 1.90 × 10−2 and 3.46 × 10−4 g m−2 d−1.
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CERAMICS INTERNATIONAL
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2018
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IF 3.057
Yang Yu,Yu Zhao,Tian-Dong Zhang,Rui-Xuan Song,Yu-Lei Zhang,Yu-Long Qiao,Wei-Li Li,Wei-Dong Fei
Colossal dielectric properties in donor-acceptor co-doped rutile TiO 2 ceramics have attracted increased interest in recent years. However, dielectric loss (tan δ) of (Nb+Al) co-doped TiO 2 ceramics are quite scattered in the previous studies. Here, we show the dielectric properties of (Nb+Al) co-doped rutile TiO 2 ceramics are sensitive to sintering and ageing technologies, which is related to the coupling behavior of acceptor-donor ions. Both permittivity and dielectric loss of as-sintered (Nb+Al) co-doped TiO 2 ceramics are very large, and increase with the sintering time increasing. After ageing treatment at 900 °C, the dielectric loss of co-doped ceramics reduces from 139 to 0.15 in a wide frequency range. Based on the X-ray diffraction and complex impedance analyses, it can conclude that Nb 5+ -Al 3+ pair formation during ageing treatment reduces the concentration of oxygen vacancy , resulting in the decreases of the conductivity and dielectric loss. The changes in dielectric response of (Nb+Al) co-doped TiO 2 ceramics clearly suggest that ageing process is an effective way for the Nb 5+ and Al 3+ ions to form the Nb 5+ -Al 3+ pairs. We believe that the coupling effect of donor-acceptor ions is a practical and feasible route to reduce the dielectric loss of (Nb+Al) co-doped TiO 2 ceramics for high-energy-density storage applications.
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RENEWABLE ENERGY
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2019
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IF 5.439
Qing Zhou,Xinyan Zhong,Xingyue Xie,Xuanyi Jia,Baiquan Chen,Ning Wang,Lihong Huang
Biomass-derived acetic acid (HAc), as a hydrogen storage medium, can be transformed to hydrogen via on-board reformer for fuel cells. Steam reforming (SR) of HAc is a traditional hydrogen production process, but endothermicity of SR is a concern for heat management in dynamic on-board application. Auto-thermal reforming (ATR) of HAc is a promising route, while catalyst deactivation in harsh ATR atmosphere should be addressed. Samarium-promoted ordered mesoporous Ni-xSm-Al-O catalysts were synthesized via improved evaporation-induced self-assembly (EISA) method, and tested in ATR of HAc for hydrogen production. The Ni-2Sm-Al-O catalyst produced a stable HAc conversion near 100.0% and a hydrogen yield at 2.6 mol-H 2 /mol-HAc in a 30-h test. Meanwhile, the Ni-2Sm-Al-O catalyst shows resistance to oxidation , sintering and coking; this improved reactivity and durability can be attributed to basic Sm oxides and ordered mesoporous framework with confinement effect : the basic sites are beneficial to adsorption and activation of HAc, and the ordered mesoporous framework constrains the thermal agglutination of Ni metal and formation of coking, while intermediate carbonous species of *CH x (x = 0–3) can be gasified via the Sm 2 O 3 -Sm 2 O 2 CO 3 cycle. These Sm-promoted Ni-based catalysts are also tested with different temperatures and O/C, and show potentials in ATR of HAc for hydrogen production.
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MATERIALS LETTERS
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2019
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IF 3.019
Kai Xu,Xiaohong Chen,Honglei Zhou,Liming Bi,Shaoli Fu,Wei Li,Xinkuan Liu,Fengcang Ma,Ke Zhang,Ping Liu
CNTs/Cu-Al 2 O 3 composite powders were successfully synthesized by in situ CVD using Cu-Al 2 O 3 composite powders obtained by internal oxidation of Cu-Al alloy powders. The multi-walled CNTs are obtained without agglomeration and stand on the surface of the composite powders. One end of the CNTs is well bound to matrix. The Cu nanoparticle was the catalyst for the growth of CNTs on the composite powders and Al 2 O 3 on the surface of the Cu-Al 2 O 3 powder plays a key role in the growth process.
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CHEMICAL ENGINEERING JOURNAL
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2017
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IF 6.216
Chunpei Yu,Wenchao Zhang,Yu Gao,Debin Ni,Jiahai Ye,Chenguang Zhu,Kefeng Ma
The energy performance of nanothermites in aqueous conditions is commonly restricted by the rapid heat dissipation and corrosion of nano-Al. Here we report studies on the fabrication and submerged ignition for the super-hydrophobic nanothermite film based upon the Co 3 O 4 /Al core/shell nanowires (NWs). The Co 3 O 4 NWs arrays, which are synthesized using a facile hydrothermal-annealing method, serve as templates for the deposition of Al shells by magnetron sputtering. The super-hydrophobic surface is subsequently realized by the fluoroalkylsilane coating. The tests of the laser-induced underwater ignition reveal that the super-hydrophobic modification effectively could lead to the ignition of the nanothermite film. Furthermore, the anti-aging behaviors of the obtained super-hydrophobic nanothermite film in aqueous conditions are investigated in detail to compare the heat-release and ignition characteristics at different submersion times. Impressively, the resultant super-hydrophobic composite could still hold about 50% of the original energy even after an underwater storage of 2 days.
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Journal of Water Process Engineering
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2024
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IF 6.3
Jinmei He,Yuqing Wang,Leihuan Mu,Jiehui Li,Yurou Dong,Ying Zhang,Yuan Deng,Pu Feng,Mengnan Qu
Hydrogen is regarded as “the ultimate clean energy source”, with the virtues of zero pollution, renewability and abundant reserves, which is expected to alleviate problems including global climate change and energy crisis. Designing reasonable methods for synthesizing efficient, inexpensive, and stable electrocatalysts for water splitting is urgently needed. In this study, we construct Al-FeCoP nanosheet array on nickel foam (Al-FeCoP/NF) with superhydrophilic/superaerophobic properties. The superhydrophilic and underwater superaerophobic surface accelerate the electrolyte penetration and bubble dissipation, thereby taking the edge off the “bubble shielding effect”. The electronic structure of the electrocatalyst is tuned through heteroatom doping and phosphorization, which effectively enhances the conductivity of the catalyst. Strikingly, the resulting Al-FeCoP/NF electrode shows remarkable activity in alkaline media, which only requires an overpotential of 121 mV and 215 mV at 10 mA cm −2 for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively. When applied for overall water splitting, the assembled two-electrode electrolyzer only needs a low voltage of 1.56 V to afford a current density of 10 mA cm −2 and can maintain over 100 h without the obvious activity attenuation, which enhances the overall catalytic activity and represents superior long-term stability. In addition, the abundant wind and solar energy resources are employed to generate electricity directly, which is subsequently convert into green hydrogen by the water electrolysis in laboratory conditions. This work provides a new idea for the manufacture of low-cost, high-activity bifunctional transition-metal phosphide electrocatalyst by element doping for green hydrogen production.
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JOURNAL OF SOLID STATE CHEMISTRY
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2015
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IF 2.133
Tianfu Zhang,Zhen Wang,Guoping Li,Yunjun Luo
A bottom-up approach combining soft template self-assembly with sol–gel process, was adopted to prepare the assembled Al/Fe 2 O 3 nanoenergetic materials, assembly-Al/Fe 2 O 3 sample. The other two unassembled Al/Fe 2 O 3 a nanoenergetic materials, sol–gel–Al/Fe 2 O 3 sample and mixing-Al/Fe 2 O 3 sample, were prepared by sol–gel method and physical mixing method respectively. The assembly process within the preparation of the assembly-Al/Fe 2 O 3 sample was analyzed through the changes in the average hydrodynamic diameters of the particles and the micelles in solution. SEM, EDS and TEM tests were performed to demonstrate a significant improvement regarding to dispersity and arrangements of the Al and Fe 2 O 3 particles in the assembled samples, compared to that of the unassembled Al/Fe 2 O 3 samples. DSC test was employed to characterize the reactivity of the samples. The heat release of the assembled Al/Fe 2 O 3 sample was 2088 J/g, about 400 and 990 J/g more than that of the sol–gel–Al/Fe 2 O 3 sample and mixing-Al/Fe 2 O 3 sample, respectively.
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Journal of Water Process Engineering
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2024
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IF 6.3
Shaorong An,Qiang Jin
The development of highly dispersed metal-based materials loaded on carbon is of great importance for environmental remediation. However, their catalytic activities face huge challenges. In this study, a series of super activated carbon-supported Fe-Al layered double hydroxides (FeAl-LDH@SAC x ) were prepared, and the peroxymonosulfate (PMS) oxidation performance and activation mechanism were probed with Rhodamine B (RhB) as a representative pollutant. Results showed that FeAl-LDH@SAC 0.02 composites exhibited superior ability in activating PMS compared to other catalysts, as evidenced by the rate constants for RhB degradation, which followed the order: FeAl-LDH@SAC 0.02 (0.5507 min −1 )>FeAl-LDH@SAC 0.04 (0.4738 min −1 )>FeAl-LDH (0.4121 min −1 )>FeAl-LDH@SAC 0.01 (0.3512 min −1 )>FeAl-LDH@SAC 0.08 (0.2701 min −1 ). The optimal doping amount for SAC depended on the ratio of active FeAl-LDH and its dispersion on the SAC, which helped to promote interfacial electron transfer. Impressively, the sulfate radicals (SO 4 · − ), hydroxyl radical (·OH), and singlet oxygen ( 1 O 2 ) made major contributions to RhB removal. The results of the toxicity assessment showed that the overall toxicity of the system tended to decrease as the catalytic oxidation proceeded. Finally, the effective removal of aromatic proteins and soluble microbial metabolites in actual dye wastewater within 60 min demonstrated that the catalytic oxidation system involving FeAl-LDH@SAC 0.02 was promising for water treatment.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
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IF 20.2
Yang Liu,Shuyu Niu,Yu Zou,Shenglong Huang,Yunxuan Shi,Shuyan Gao,Panagiotis Tsiakaras
It is a great challenge to design and synthesize catalysts that can regulate both adsorption and desorption processes for electrocatalytic nitrate reduction to ammonia (NRA). Herein, amorphous Cu-Ni-Al nanometallic glasses (NG) were synthesized using a facile thermal evaporation coupled Joule heating method. The Cu 50 Ni 25 Al 25 -NG exhibits remarkable Faradaic efficiency (98.81 %) and NH 3 yield-rate (211.14 μmol h −1 cm −2 ) at an outstanding positive potential of −0.15 V vs. RHE. Aluminum atoms of low work-function when intercalated at different positions in Cu 50 Ni 25 Al 25 -NG enhance both adsorption and desorption processes during NRA. The oscillatory properties of surface potential detected by Kelvin-probe force microscopy demonstrate the diversity of active sites on Cu 50 Ni 25 Al 25 -NG. Two potential-regulated reaction mechanisms in NRA on the surface of Cu 50 Ni 25 Al 25 -NG were proposed using in-situ electrochemical Raman spectra. This work provides a new method for the preparation of multi-element NG enriched with low work-function metals and a new idea for the synthesis of synergistic catalytic-sites for NRAs.
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FUEL
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2024
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IF 6.7
Ranlei Shao,Lu Zhang,Luyuan Wang,Jianmei Wang,Xingyu Zhang,Shiwang Han,Xingxing Cheng,Zhiqiang Wang
In this study, Ru catalysts supported on Ce-Al composite carriers were prepared using the precipitation-hydrothermal method, significantly enhancing ammonia decomposition efficiency. The test results show that the Ru/3Ce-Al catalyst, with a Ru loading of only 0.8 wt%, achieves a reaction rate of 14.17 mmol g cat −1 min −1 at 500 °C, and reaches a 95 % conversion rate at 525 °C. No decline in efficiency was observed after 48 h of durability testing, which significantly reduces the usage of Ru. The RuO 2 particle size in the samples was only 2–4 nm. Ce-Al composite increased the specific surface area and pore volume of the catalyst, facilitating the uniform distribution of Ru. Additionally, it increased the number of surface acidic sites and strengthened the metal-support interaction. The unique low redox potential and oxygen vacancies of CeO 2 allowed for faster electron transfer to the Ru surface. DFT calculations revealed that bridge site adsorption was more stable, with the rate-determining step of the ammonia decomposition reaction being the formation of N 2 . Ce-Al composite catalysts enhanced NH 3 adsorption strength and lowered the reaction energy barrier.
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