Catalysis Science & Technology
·
2020
·Vol. 10
·期 8
·2443-2451
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IF 5.721
Cong Mao,Jingwei Zheng,Babasaheb M. Matsagar,Ranjith Kumar Kankala,Tansir Ahamad,Yucheng Yang,Kevin C.-W. Wu,Xueqin Zhang
Ruthenium nanoparticles supported onto aluminum-doped mesoporous silica catalysts (Ru/Al–SBA-15) are fabricated using hydrothermal and impregnation methods for catalysis application. The Ru/Al–SBA-15-3 catalyst at a Si/Al molar ratio of 3 exhibited excellent catalytic performance for the hydrogenation of p-phthalic acid with high conversion efficiency (100.0%) and cis-isomer selectivity (84.0%) in water. Moreover, this system displays exceptional stability and recyclability through preserving the conversion efficiency, as well as a cis-isomer selectivity of 90.2 and 83.3%, respectively, after reusing it fourteen times. Such an exceptional system can also be ideal for the hydrogenation of aromatic dicarboxylic acids and their ester derivatives in water. Strong Lewis acid sites due to doped Al species play significant roles in the hydrogenation reaction. Moreover, isotope labeling studies indicated that water molecules effectively participated in the hydrogenation reaction. Hydrogen and water contributed half of the hydrogen atoms for this hydrogenation reaction. In the end, a plausible mechanistic pathway for the hydrogenation of p-phthalic acid using the Ru/Al–SBA-15-3 catalyst in water is proposed.
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Green Energy & Environment
·
2020
·
IF 6.395
Jiajun Liu,Kui Wu,Zhengke Li,Wensong Li,Yuqing Ning,Weiyan Wang,Yunquan Yang
The great challenge in the aldol condensation of tailored fermentation products (acetone–butanol–ethanol, ABE) into energy intensive fuels is to develop a suitable catalyst with high activity and low–cost. In this study, Co, Ni, and Co–Ni supported on Mg–Al oxide catalysts were prepared and their pore diameters were enlarged via adding active carbon as a hard template into Mg–Al hydrotalcite. During the aldol condensation reaction, the catalyst activity was enhanced after enlarging the pore diameter and Co–Ni bimetal supported catalyst presented the highest activity, which was resulted from that the electron transfer between Co and Ni in Co–Ni alloy enhanced the dehydrogenation activity and large pore lowered the mass transfer resistance. After optimizing the reaction conditions, acetone conversion and the total selectivity of C 5 –C 11 desired products in the aldol condensation of ABE reached up to 76% and 90%, respectively. The stability study showed that the activity was decreased with the increase of reaction number because of the oxidation of metallic Co and Ni, but this could be solved via a simple hydrogen reduction method.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Wanchen Zhu,Zhongyang Luo,Feiting Miao,Longyi Liu,Akira Nakayama
Biomass hydropyrolysis (HP) vapor upgrading (VU) is highly promising for producing sustainable aviation fuel, yet challenges remain. This study focused on PdMo/γ-Al 2 O 3 and Mo/γ-Al 2 O 3 catalyzed HP-VU of biomass in a pressurized continuous fixed-bed and the reaction mechanism. The results demonstrated that the introduction of Pd enhanced the hydrodeoxygenation activity through multiple effects, including the generation of surface acidic sites, the formation of oxygen vacancies, and the effect of hydrogen spillover. Beyond this, the effects of upgrading temperature and pressure on the catalytic performance of PdMo/γ-Al 2 O 3 were also investigated. Under optimal conditions of 400 °C and 1.0 MPa, the organic phase achieved a mass yield of 12.03 wt%, with the selectivity of C4+ aliphatic hydrocarbons and monocyclic aromatic hydrocarbons reaching 77.01 %, leading to an HHV of 42.41 MJ/kg and high mass balance (98.71 %). Density functional theory calculations further provided insights into the role of defect sites in facilitating C–O/C=O bond cleavage and the contribution of Pd sites to C C bond activation. By integrating theoretical calculations with model compound experiments, the study revealed the potential reaction pathways including hydrodeoxygenation, hydrogenation, and C C coupling. This study provides practical and theoretical insights into the bimetallic-catalyzed HP-VU process of biomass.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Mian Yang,Kaihua Chen,Shenghui Guo,Ming Hou,Jiyun Gao,Junwen Zhou,Shuhao Shi,Li Yang
In this paper, the self-propagating reaction of the Ti–SiC–C system for synthesising Ti 3 SiC 2 -based diamond composites is ignited by the combustion of Ni–Al alloy powders in a microwave field. The heating curves of Ni–Al-assisted microwave sintering show that the self-propagating reaction could be successfully ignited after heating samples to 685.2 °C in a microwave field for 456 s. This finding indicates that ignition could occur at temperatures below the diamond graphitisation temperature (727 °C). X-ray diffraction analysis indicates that the sintered samples primarily comprise Ti 3 SiC 2 , TiC, Ti 5 Si 3 and C. Scanning electron microscopy coupled with energy dispersive spectroscopy observations demonstrates that the diamond grains are tightly bonded with the surrounding matrix and are intact. The best wear ratio of 302.26 was obtained for the Ti 3 SiC 2 -bonded diamond composite when the diamond grain size was 140/170 mesh and the molar ratio of Ti, SiC and C was 3:1.1:0.9.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Yimin Zhang,Yun Zu,Ke Yan,Yuan Zhu,Yibin Luo,Enhui Xing,Qiang Li,Lijuan Song,Tan Li,Yi Mei,Xingtian Shu
In this work, a "bottom-up" strategy was proposed to one-step, in-situ synthesize P@ZSM-5 zeolites in a sodium-free system by elaborately self-designed tetrapropylphosphonium hydroxide as a new member of MFI-type zeolite organic templates inventory, and the interaction of phosphorus species with framework aluminum was investigated in detail. Multiple advanced characterizations confirm that the tetrahedrally-coordinated bidentate P IV -O 2 -Al IV structures are precisely customized and uniformly scattered in the zeolite channels. After experiencing harsh hydrothermal treatment (100 %H 2 O, 800 °C, 17 h), this new structure endows excellent hydrothermal stability of zeolite (crystallinity retention beyond 95 %) and reinforces its Brønsted acidity. Furthermore, methanol-to-propylene tests show that directly synthetic P@ZSM-5 zeolite performs extraordinarily long lifetime (180 h, WHSV = 1 h −1 ), enviable propylene selectivity (60.4 %) and propylene/ethylene ratio ( ca. 4.3) compared to the counterparts, which is benefited from encouragingly olefinic cycle pathway. These findings afford value-filled opportunities in novel catalyst production mode and understandings for phosphorus-zeolite chemistry . Synopsis -A "bottom-up" strategy was demonstrated to one-step, in-situ synthesize P@ZSM-5 zeolite in a sodium-free system by elaborately self-designed tetrapropylphosphonium hydroxide. The resultant P@ZSM-5 catalyst with hyperuniformly-stable bidentate P IV -O 2 -Al IV structures exhibited extraordinarily long lifetime (180 h) and enviable propylene selectivity (60.4 %).
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Petroleum Science
·
2025
·
IF 6.1
Chuan-Hao Zhang,Qi Dong,Fei Wang,Ning-Yue Lu,Feng Yu,Bin-Bin Fan,Rui-Feng Li
Deep hydrogenation of polycyclic aromatic hydrocarbons (PAHs) into jet fuel is an important strategy for the upgrading of light cycle oil (LCO). Zeolite-supported metal catalysts have exhibited good catalytic performance for hydrogenation of PAHs under relatively mild conditions. However, the impacts of acidity variations in zeolite supports, arising from the differences in framework Al (Al F ) distribution on the catalytic behavior of zeolite-supported metal catalysts in the deep hydrogenation of PAHs remains unclear. Herein, two series of mesoporous ZSM-5 samples, that is ZSM-5-E- x and ZSM-5-F- x , with the differences in Al F distribution but similar Si/Al ratios, were prepared in the crystallization system with or without NaOH. The results of NH 3 -TPD, Pyridine-IR, N 2 adsorption-desorption and SEM reveal that two series of HZSM-5 samples have similar acid density and acid strength, textural properties, morphology and particle size. However, the results of XPS, 27 Al MAS NMR, 2,6-Ditert-butylpyridine-IR, catalytic cracking of 1,3,5-triisopropylbenzene and the controlled reactions as well as DFT calculation indicate that the higher enrichment degree of Al F on the external surface and the suitable arrangement mode of Al F in ten-membered ring (10-MR) of HZSM-5-F- x compared to HZSM-5-E- x in case of the similar Si/Al ratios, result in Pt/HZSM-5-F- x exhibiting remarkably-improved deep hydrogenation performance of phenanthrene (PHE) compared to Pt/HZSM-5-E- x . Particularly, the selectivity to perhydrophenanthrene (PHP) over Pt/HZSM-5-F-50 can reach above 99.0% at a conversion of PHE (>99.0%). Furthermore, Pt/HZSM-5-F-50 exhibits well reusability. This work helps to clarify the impact of Al F distribution in ZSM-5 on catalytic hydrogenation performance for PAHs, providing valuable guidance for design and development of efficient catalysts for the hydrogenation of PAHs.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
·
IF 5.4
Yunle Yao,Rui Pan,Hua Cheng,Yi Gong,Lin Chen,Xian Zhang,Meng Xue,Xingyou Tian
Encapsulation is a crucial technology for isolating and protecting moisture-sensitive materials. However, traditional organic-inorganic composite films often exhibit poor adhesion at the interface and high gas permeability, making stable operation difficult. In this work, an enhanced atomic layer deposition (EALD) method was used to uniformly deposit a layer of thickness-controlled alumina on a Polyethylene Naphthalate (PEN) film with oxygen-containing polar groups(CTPEN) on its surface, successfully producing a high-barrier composite film (EALD-Al 2 O 3 /CTPEN) with Al-O-C chemical bonds. The designed CTPEN film significantly enhanced the adhesion of alumina, thereby improving the performance of the composite film. Moreover, the mechanical properties of the composite film were significantly enhanced, with the elongation at break of EALD-Al 2 O 3 /CTPEN at 72 % being considerably higher than that of ALD-Al 2 O 3 /PEN at 44 %, and the tensile strength reaching 220 MPa. At the same time, EALD-Al 2 O 3 /CTPEN maintained excellent light transmission, exceeding 85 %. Humidity -sensitive resistors encapsulated with EALD-Al 2 O 3 /CTPEN exhibited stable operating performance in both air and humidity-sensitive environments, confirming the superior barrier properties of the composite film. This EALD-Al 2 O 3 /CTPEN composite layer holds promise as a prospective encapsulation layer for future flexible devices.
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ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Jiali Jiang,He Li,Jianxing Huang,Kun Li,Jing Zeng,Yang Yang,Jiaqi Li,Yunhui Wang,Jing Wang,Jinbao Zhao
The Li3VO4@C microsphere composite was first reported as a novel cathode material for rechargeable aluminum-ion batteries (AIBs), which manifests the initial discharge capacity of 137 mAh g–1 and and remains at 48 mAh g–1 after 100 cycles with almost 100% Coulombic efficiency. The detailed intercalation mechanism of Al into the orthorhombic Li3VO4 is investigated by ex situ X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) of Li3VO4@C electrodes and the nuclear magnetic resonance aluminum spectroscopy (27Al NMR) of ionic liquid electrolytes in different discharge/charge states. First-principle calculations are also carried out to investigate the structural change as Al inserts into the framework of Li3VO4. It is revealed that the Al/Li3VO4@C battery goes through electrochemical dissolution and deposition of metallic aluminum in the anode, as well as the insertion and deinsertion of Al3+ cations in the cathode in the meantime. The rechargeable AIBs fabricated in this work are of low cost and high safety, which may make a step forward in the development of novel cathode materials based on the acidic ionic liquid electrolyte system.
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CERAMICS INTERNATIONAL
·
2026
·
IF 6
Fucheng Liu,Yuhui Chen,Lei Zhuang,Hui Wang,Hulei Yu,Yanhui Chu
High-temperature materials with superior long-term oxidation resistance above 2000 °C are urgently sought for next-generation hypersonic vehicles. Here, (W 0.28 Ta 0.28 Mo 0.28 Cr 0.15 )(Al 0.2 Si 0.8 ) 2 -Al 2 O 3 dual-phase high-entropy alumino-silicides (HEAS-Al 2 O 3 ) are developed, which exhibit superior long-term oxidation resistance up to 2100 °C. To be specific, the as-fabricated HEAS-Al 2 O 3 samples are found to consistently follow an oxygen-diffusion parabolic law across 1700–2100 °C, possessing a high activation energy of 234.4 kJ mol −1 . Moreover, an ultralow oxidation depth of 0.4 mm after 120 min of laser oxidation and a linear plasma ablation rate of 0.026 μm s −1 at 2100 °C are achieved. Such remarkable oxidation resistance is mainly attributed to the increase in Al cations due to Al 2 O 3 incorporation, coupled with the inclusion of multiple cationic elements, to significantly enhance the rigidity of the glass network. Thereby, the viscosity and high-temperature stability of the resulting aluminosilicate glass are markedly improved, effectively protecting the underlying unoxidized HEAS-Al 2 O 3 . The as-developed HEAS-Al 2 O 3 shows great promise as a thermal structural candidate for next-generation hypersonic vehicles.
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MINERALS ENGINEERING
·
2026
·
IF 6
Hongqin Chen,Yanhai Shao,Xiao Meng,Jinhui Li,Xinru Jia,Hong Lin,Chengxiang Li
An efficient flotation separation strategy for smithsonite and calcite was established using a ternary collector (ABN) and sodium phytate (SP) at weakly alkaline pH. • Optimized SP-ABN system yields a mixed-ore Zn grade of 36.39% with 62.75% recovery. • XPS, AFM and Zeta potential analyses confirm that SP selectively shields calcite via strong Ca-chelation. • SP forms a dense layer on calcite, effectively blocking the adsorption of the ABN collector via steric hindrance and electrostatic repulsion. This study systematically investigated the selective depression behavior of sodium phytate (SP) in the flotation separation of smithsonite from calcite using an Al-BHA-NaOL collector system (ABN). Although ABN (2.5 × 10 -5 mol/L) exhibited moderate selectivity toward smithsonite under weakly alkaline conditions, calcite remained relatively floatable, resulting in limited separation efficiency. The addition of SP effectively depressed calcite flotation while only slightly influencing smithsonite, thereby significantly improving the separation performance. Under the optimal conditions of pH 8.0 and SP dosage of 21.65 × 10 -6 mol/L, artificial mixed mineral flotation tests produced a concentrate with a Zn grade of 36.39% and Zn recovery of 62.75%. To elucidate the selective depression mechanism, zeta potential measurements, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), atomic force microscopy (AFM) and contact angle analysis were performed. The results demonstrated preferentially interacted with calcite rather than with smithsonite, resulting in greater changes in surface charge, surface morphology, and hydrophobicity. XPS analysis revealed a significant shift in the Ca 2p 3/2 peak on calcite after SP treatment, whereas the Zn 2p 3/2 peak of smithsonite exhibited only a negligible change, indicating a much stronger interaction between SP and calcite. SP significantly hindered ABN adsorption on calcite, while its influence on collector adsorption on smithsonite remained limited. These findings indicate that SP as an environmentally friendly selective depressant for calcite provides new insights into the selective regulation of carbonate mineral surfaces, offering a promising strategy for the flotation beneficiation of carbonate-associated zinc oxide ores. Download: Download high-res image (236KB) Download: Download full-size image
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Mining Metallurgy & Exploration
·
2026
·
IF 2.5
Wang Guangdong,Bai Ziyang,Li Maohui,Mao Xishan,Yu Jie,Su Chang,Hu Wenwen,Ma Bo,Sun Wenzhou,Lu Youjun
In response to the limitations of the traditional acid leaching process in terms of environmental impact and safety, this study developed a ternary mixed acid system (hydrochloric acid - oxalic acid - citric acid) without the use of hydrofluoric acid and nitric acid. The influence of three process parameters, namely, the concentration of the mixed acids, the liquid-solid ratio, the acid leaching temperature, and the acid leaching time, on the removal efficiency of impurities such as Fe, Mn, Al, K, and Na in quartz sand was systematically investigated. The experimental results revealed that the optimal acid leaching conditions were a hydrochloric acid concentration of 4.5 mol·L − 1 , an oxalic acid concentration of 0.03 mol·L − 1 , a citric acid concentration of 0.04 mol·L − 1 , a liquid-solid ratio (mass ratio) of 5:1, a constant temperature of 60 ℃, and a holding time of 3 h. Under these conditions, the removal rates of Fe, Mn, and Al reached 89.2%, 71.0%, and 60.1%, respectively. Moreover, K and Na were also removed to a certain extent, with removal rates of 39.6% and 25.5%, respectively. Mechanistic analysis revealed that in the ternary mixed acid system, hydrochloric acid provides an acidic environment, and the combination of oxalic acid and citric acid synergistically promotes the dissolution of impurities through complexation, reducing impurities on the surface of quartz sand, improving the cleanliness, and forming micro-porous structures. Compared with the traditional hydrogen fluoride-nitric acid leaching process, the fluorine-free ternary mixed acid system proposed in this study has a similar or even better removal efficiency for impurities such as Fe and avoids the environmental and safety risks associated with hydrogen fluoride. This system can achieve the simultaneous removal of various impurities in quartz sand under normal pressure and medium-low-temperature conditions, providing a new technical path for the development of quartz sand purification technology for safety and environmental protection.
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Catalysts
·
2026
·Vol. 16
·期 6
·494
·
IF 4.5
Zijie Chen,Jinyang Chen
A series of Mg-Al LDH-based photocatalysts were synthesized via a one-pot steam-assisted method, including pure Mg-Al LDH (MA), Zn-In ion-exchange-modified Mg-Al LDH (MAZ), BiOCl-loaded pristine Mg-Al LDH (MAB), and Zn-In-modified Mg-Al LDH co-loaded with TiO2and BiOCl (MA/Zn-In/TiO2/BiOCl, MAZB). The one-pot synthesis facilitated the in situ intercalation and uniform loading of BiOCl/TiO2/Zn-In, while Zn2+/In3+modified the MA layers via ion exchange, leading to an expansion of the interlayer spacing. The innovation of this work is reflected in two aspects: first, all raw materials are added via a one-pot strategy to achieve in situ preparation of modified hydrotalcite; second, this synthetic route features simple post-treatment without complicated washing, pressure filtration, and other tedious operations. The samples were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and N2adsorption–desorption isotherms. The bismuth chloride oxide/TiO2/LDHs exhibited a layered structure, with the active components uniformly distributed between the layers and on the MA surface. Under simulated sunlight irradiation, MAZB achieved 97.5% degradation of 20 mg/L MB within 120 min, with an apparent rate constant of 0.0297 min−1, which is 7.2 times, 2.4 times, and 2.9 times that of MA, MAZ, and MAB, respectively. The degradation rate of MAZB still remained at 89.5% after five cycles, demonstrating excellent stability and reusability. Compared with traditional hydrothermal methods, this steam-assisted system features mild reaction conditions (180 °C, atmospheric pressure), sodium-free raw materials, no washing requirement, and zero waste discharge, showing prominent green advantages.
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