INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2018
·
IF 3.141
Wei Bi,Yanjie Hu,Wenge Li,Hao Jiang,Chunzhong Li
In this work, a nanoreactor combining layers of facile traditional two-dimensional (2D) material, hexagonal boron nitride (h-BN, which often called the white graphene) with Pt/Al2O3 catalyst was designed to exhibit higher stability, activity, and selectivity in automobile exhaust treatment. Characterization revealed that h-BN does coat on the surface of platinum and forms a distinct Pt@h-BN/Al2O3 core–shell nanostructure. This as-prepared catalyst possesses good thermal stability and selectivity, because of the excellent high-temperature tolerance and the multidefected structure of the h-BN shell; that is, small molecules such as CO and O2 can easily intercalate into the nanoreactor, while large molecules such as propylene are blocked out. Meanwhile, the intercalated reactants can achieve the conversion of CO to CO2 faster (ΔT100 = 20 °C) with the confinement effect. The study indicates that constructing a nanoscale confined environment with two-dimensional (2D) coating can enhance the performance of the catalyst in multiple aspects and simultaneously provide a good example for designing nanostructured catalysts with multifaceted improvement.
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ENERGY & FUELS
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2026
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IF 6
Jiuhong Wei,Yanni Liu,Shihua Zheng,Yajing Cai,Guojie Zhang
Dry reforming of methane (DRM) provides an attractive pathway for the simultaneous utilization of CH4 and CO2 to produce syngas; however, Co-based catalysts typically suffer from metal sintering, formation of hardly reducible cobalt aluminate (CoAl2O4), and severe carbon deposition under high-temperature conditions. Herein, Y-promoted Co catalysts supported on alumina with tailored pore architectures were developed, with particular emphasis on a hierarchical bimodal porous Al2O3 support (Al2O3-BA) integrating ordered mesopores and interconnected macroporous channels. Compared with mesoporous Al2O3-SA and commercial γ-Al2O3-supported counterparts, the 10Co-5Y/A2O3-BA catalyst exhibited smaller Co3O4 crystallites and more uniform nanoparticle dispersion, indicating mitigated agglomeration. H2-TPR analysis revealed enhanced reducibility with a shift of the main reduction peak to lower temperature and a markedly suppressed high-temperature CoAl2O4 feature, suggesting weakened metal–support interaction. CO2-TPD demonstrated an increased population of medium-strength basic sites, favoring CO2 adsorption and activation. XPS indicated a higher Co2+/Co3+ ratio and an increased proportion of surface-adsorbed oxygen species, implying modified surface electronic properties. These structural and surface characteristics translated into superior catalytic performance. The bimodal catalyst delivered the highest CH4 and CO2 conversions over 650–800 °C and maintained stable activity during a 24 h test at 750 °C, achieving 86.5% CH4 conversion, 91.5% CO2 conversion, and an H2/CO ratio of 0.92. Postreaction analyses revealed significantly reduced carbon deposition compared with mesoporous counterparts. Overall, the synergy between Y promotion and hierarchical bimodal porosity effectively modulates metal–support interaction, enhances reducibility and CO2 activation, and suppresses coking, providing a rational strategy for designing durable Co-based catalysts for DRM.
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Laser & Photonics Reviews
·
2023
·Vol. 18
·期 3
·2301039
·
IF 11
Qianxi Pang,Yichao Wang,Liqing Yan,Ge Zhu,Sai Xu,Jinsu Zhang,Xizhen Zhang,Yongze Cao,Baojiu Chen
Technological progress has promoted the development of ultra-wide near-infrared (NIR) luminescent materials as a new NIR light source. The ultra-wide near-infrared (NIR) emission in Na(Al,Ga) 11 O 17 :xCr 3+ (NAGO:xCr 3+ ) phosphors is achieved by constructing unique Cr 3+ -Cr 3+ ion pair confined structure. The Cr 3+ -Cr 3+ ion pairs can be observed at a low concentration of Cr 3+ ions(x = 0.04), the increase of Ga 3+ ion would promote the formation of Cr 3+ -Cr 3+ ion pairs, thereby effectively enhancing the energy migration process from high-energy Cr 3+ ions to low-energy Cr 3+ ones. Herein, the full width at half maximum can be finely adjusted in a wide range from 17 to 223 nm, while the emission peaks can shift from 704 to 860 nm. NAGO:xCr 3+ exhibits the longest-wavelength emission in the known Cr 3+ -doped galliates and aluminates phosphors. The study further reveals the inherent mechanism of affect on the photoluminescence properties for Cr 3+ -Cr 3+ ion pairs. The quantum efficiency of optimal NaAl 11 O 17 :0.004Cr 3+ (sharp emission) and NaGa 11 O 17 :0.02Cr 3+ (ultra-wide emission) samples reaches 87.6% and 46.6% with high thermal stability (84.47% and 67.52%@150 °C), respectively. The comprehensive properties are excellent among known phosphors with similar property. Multifunctional applications of NAGO:xCr 3+ in agricultural production, quality inspection, and imaging fields are also demonstrated.
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JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Peng Yang,Xicheng Zhang,Chenguang Zhang,Shiping Ma,Xiaowei Yang,Yanli Xiong,Yong Xie,Yong Cao,Yanhua Cui,Xiaojiang Liu,Xinlu Li
As the most investigated cathode of thermal batteries , the electrochemical performance of CoS 2 is limited by a big polarization at high current density and low working temperature, which is ascribed to the poor wettability of molten salt on CoS 2 surface and low exchange current density . In this contribution, Al 2 O 3 is selected as a modifier to improve the wettability of molten salt on CoS 2 surface and exchange current density at the same time, by adjusting the dielectric polarization field of CoS 2 surface. The discharge capacity (V ≥ 1.7 V) of CoS 2 increases by ~11% at 500 °C with a discharge current of 300 mA cm −2 , and 55% at 450 °C with a discharge current of 100 mA cm −2 , by the decoration of Al 2 O 3 nanoparticles . Moreover, the influence of decorated Al 2 O 3 nanoparticles on the electrochemical performance of CoS 2 are discussed.
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JOM
·
2021
·Vol. 74
·期 2
·622-633
·
IF 2.474
Liu Zhihong,Ye Fengchun,Chen Rui,Wang Hongjun,Xia Longgong
Halogen-containing organic components in waste electrical and electronic equipment have an obvious influence on the distribution behaviors of valuable metals during the smelting processes. However, the mechanism is still incomplete in the literature. The equilibration-quenching-(ICP+EPMA) experimental technique has been applied in studying the partitioning behaviors of Au, Ag, and Sn in the Cu-FeO x -SiO 2 -CaO-Al 2 O 3 smelting system in the presence of halogen elements (F, Cl, Br). The obtained results showed that: (1) 93% Au terminated into the alloy phase in CaF 2 adding experiments, and a maximum of 32% Au reported to the gas phase in CaCl 2 or CaBr 2 adding experiments; (2) 22–49% Ag entered the gas phase when adding CaF 2 into the system, and 3–34% Ag entered into the gas phase when adding CaCl 2 or CaBr 2 ; and (3) halogen elements influenced Sn dramatically, and portions of Sn in the gas phase and slag phase increased along with increasing temperature or halides dosage.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Juan He,Han Jia,Qiuxia Wang,Yingbiao Xu,Lingyu Zhang,Haidong Jia,Lin Song,Yuanbo Wang,Qiuyu Xie
Pickering emulsions are regarded as promising chemical flooding agents to control profile in enhanced oil recovery (EOR). Stimuli responsive Pickering emulsions are introduced to simplify the process of subsequent demulsification . In the present work, we construct pH and redox-triggered emulsions stabilized by oxidized 1,1′-ferrocenedicarboxylic acid-(N,N-dimethyldodecylamine) 2 (FDA-(DMDA) 2 -Ox) and Al 2 O 3 nanoparticles . Stable emulsions with low water separation rate (18.5 %) after 12-day storage can be obtained by combining a low concentration of FDA-(DMDA) 2 -Ox (< 0.07 wt%) and Al 2 O 3 nanoparticles. The emulsions can undergo the conversion of emulsion type (from oil-in-dispersion emulsions to oil-in-water Pickering emulsions) triggered by pH (surface charge switchability of Al 2 O 3 nanoparticles) and emulsification/demulsification switchable behaviors triggered by redox reaction (redox response of FDA-(DMDA) 2 -Ox). The switch mechanism is revealed via the measurements of optical micrographs, zeta potential , cyclic voltammetry curves, and interfacial tension. Micromodel tests display that both oil-in-dispersion emulsions and oil-in-water Pickering emulsions can improve the displacement efficiency and enhance the sweep efficiency respectively to greatly enhance oil recovery. The pH and redox responsive flooding fluid display promising adaptability to complicated reservoir conditions and convenient implement for subsequent demulsification, transportation and refining
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APPLIED CATALYSIS A-GENERAL
·
2022
·
IF 5.723
Yucong Song,Xiaoshu Ding,Fang Li,Dongsheng Zhang,Xinqiang Zhao,Yanji Wang
Methylcyclohexane diisocyanate (HTDI) is the core raw material for the synthesis of high-grade polyurethane . Aiming at the problems existing environmental pollution and safety risks in the phosgene process, a novel and green synthesis route of HTDI was proposed. We studied the catalytic hydrogenation of dimethyl toluene dicarbamate (TDC) benzene ring to methyl cyclohexyldicarbamate (HTDC) in this novel route. The effects of metal active components, supports and metal Rh loadings on the catalytic performance were investigated. It was found that the supported Rh/γ-Al 2 O 3 catalyst had excellent catalytic activity and selectivity. The yield of HTDC was close to 100 % at 100 °C under 3 MPa hydrogen pressure. However, the catalyst was deactivated seriously after the reaction. The organic matter adsorbed on the catalyst surface and covered the active metal was the main reason for the catalyst deactivation . Fortunately, the deactivated catalyst could be regenerated by solvent washing and high temperature calcination .
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METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2023
·
IF 3
Han Ziqi,Liu Zhihong,Li Qihou,Wang Kai,Yu Zhiqian,Xia Longgong
Ternary compounds in the Al–Te–O system have been considered as potential materials for Low-Temperature Co-fired Ceramics preparation. Two ternary compounds, Al 2 TeO 6 and Al 2 Te 2 O 7 , have been found in the Al–Te–O system under 920 °C in air. The decomposition behavior of these two compounds has been studied with Thermogravimetric Analysis-Differential Scanning Calorimetry (TGA-DSC) and equilibration experiments. Phase equilibrium of the Al 2 O 3 –TeO 2 system has also been experimentally investigated at ambient atmosphere, and corresponding phase diagram has been derived. Obtained results showed that Al 2 Te 2 O 7 , could only be found when TeO 2 was 66.7-70.0 mol pct and temperature was at 590 °C to 610 °C. Al 2 TeO 6 decomposed into Al 2 O 3 , TeO 2 (g), and O 2 (g) when temperature was above 920 °C. Al 2 Te 2 O 7 converted into Al 2 TeO 6 at 620 ± 2 °C, and then followed the decomposition path of Al 2 TeO 6 . In phase equilibrium study, when the initial sample started from the Al 2 O 3 –Al 2 TeO 6 region, Al 2 TeO 6 and Al 2 O 3 were found in quenched samples at the temperature range of 500 °C to 915 °C. When the initial sample started from the Al 2 TeO 6 –TeO 2 phase region, two solid phases, Al 2 TeO 6 and TeO 2 , could be found in samples prepared under 725 ± 2 °C. When the temperature was above 730 ± 2 °C, there were Al 2 TeO 6 and one oxide liquid phase. In the Al 2 Te 2 O 7 –TeO 2 region, all equilibrated samples had Al 2 Te 2 O 7 and TeO 2 .
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Kangyu Liu,Bingzhang Shao,Haichao Liu,Jinlong He,Aiguo Zheng,Genghong Li,Bo Zheng,Zeyang Li,Wei Liu,Xuefeng Li,Baoning Zong
Antibacterial monomers are prerequisites for synthesizing antibacterial polymers, especially during the current COVID-19 pandemic. Dimethyl-protected cyclic lysine (DMCL) is a promising functional monomer for nylon-6 based self-cleaning antibacterial polymers. However, the production of DMCL still faces formidable challenges, such as harsh reaction conditions and low catalyst activities. In this study, we developed a Pd/ m -Al 2 O 3 -Si catalyst, which exhibited high efficiency in converting α -amino- ε -caprolactam ( α -ACL) to DMCL, affording a yield of as high as 97.1% at 100 °C and 1 MPa H 2 . The lack of Brönsted acid sites on the catalyst surface facilitated the formation of DMCL and suppressed undesirable hydrolysis or cracking by-products from the lactam-based reactant. The recycled experiments showed that Pd/ m -Al 2 O 3 -Si performed excellent stability and physical strength with essentially no damage to its microspheres after the reaction. The nylon‑6 copolymers produced from the as-synthesized DMCL exhibited similar structure and thermal stability with pure nylon-6, showing great potential in synthesizing the self-cleaning antibacterial polymers. This work provides a sustainable and efficient method for producing DMCL and other lysine-based antibacterial monomers, showing a great prospect for the utilization of bio-based chemicals in synthesizing functional polymers.
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Molecular Catalysis
·
2023
·
IF 4.6
Shiwei Feng,Chengping Zhang,Hengdao Quan
As an environmentally friendly cleaning agent, Z -1-chloro-3,3,3-trifluoropropene (HCFO-1233zd( Z )) can realize industrial production by the isomerization of HCFO-1233zd( E ). Herein, various isomerization catalysts with different structures, compositions and acid properties were prepared through the fluorination of γ-Al 2 O 3 with CHF 3 by controlling the activation conditions. For the first time, the catalysts for HCFO-1233zd( E ) isomerization were systematically studied by XRD, N 2 physisorption, XPS, SEM, MAS NMR spectroscopy, NH 3 -TPD and py-IR. The active site of this reaction was revealed and the catalyst deactivation mechanism was proposed. It turned out that HCFO-1233zd( E ) isomerization prefers to occur at Lewis acid sites with moderate density and strength. The amorphous particles composed of γ-Al 2 O 3 , Al 2 O 3 (F) and α-AlF 3 ( R 3 ¯ c ) at 450 °C exhibit highly catalytic activity for HCFO-1233zd( E ) isomerization. After 100 h evaluation, it was found that residual γ-Al 2 O 3 can be fluorinated by HCFO-1233zd( E ) to form needle-like structures which could induce the amorphous Al 2 O 3 (F) particles to reorganize and give cubic structures, where the Lewis acid properties were enhanced, leading to catalyst deactivation.
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Journal of Asian Ceramic Societies
·
2023
·
IF 2.3
Haidong Wu,Wei Liu,Yuerui Xu,Lifu Lin,Yehua Li,Shanghua Wu
Due to the processing of alumina ceramic cutting tools with complex shapes using traditional methods is difficult and time-consuming, vat-photopolymerization-based 3D printing was adopted to fabricate Al2O3 ceramic cutting tools with grooves for the first time. Subsequently, cutting performance evaluation and wear mechanism analysis were conducted. The relative density, Vickers hardness, and bending strength of the alumina cutting tools were determined. The effects of the cutting speed, feed rate, and cutting depth on the cutting performance and wear mechanism of the cutting tools were systematically investigated. In addition, two commercial cutting tools, namely cemented carbide and ceramic tools without grooves, were used for comparison. The cutting speed has the highest influence on the cutting performance, whereas the cutting depth has the least influence. The cutting performance of the prepared alumina cutting inserts with chip breaker grooves superior to that those without chip-breaking grooves and that of the cemented carbide tools. The wear mechanisms of the prepared alumina cutting tools and commercial tools were determined to be abrasive and adhesive wear, and those of the cemented carbide tools were adhesive wear and breakage. This work opens a new avenue for the future preparation of high-performance and complex-shaped ceramic cutting tools.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2019
·
IF 1.911
Weiquan Cai,Junlin Zhuo,Jimin Fang,Zhichao Yang
A series of nanorod-like porous Pd/γ-Al 2 O 3 catalysts with controllable textural properties and enhanced catalytic performance in 2-ethyl-9,10-anthraquinone (eAQ) hydrogenation for H 2 O 2 preparation were successfully prepared via a facile sol–gel method using aluminum isopropoxide as aluminum precursor and eAQ as structure directing agent, sequential calcination and impregnation process with Na 2 PdCl 4 solution. The physicochemical properties of the catalysts obtained with different addition amounts of eAQ were comparatively characterized by XRD, TG–DSC, BET, TEM, CO-TPR, H 2 -TPR and H 2 –O 2 titration. The results show that addition of eAQ can not only effectively control the textural properties (surface area, pore volume and average pore size) of the catalysts, but also lower their reduction temperature of active metal. Importantly, the catalyst obtained with an addition amount of 4 wt% eAQ shows the highest hydrogenation efficiency of 10.28 g·L −1 , which is 37.3% higher than 7.49 g·L −1 of the catalyst obtained without eAQ.
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危险品化学品经营许可证（带存储）