JOURNAL OF CATALYSIS
·
2026
·
IF 6
Denghui Cheng,Yang Gao,Huan Yang,Fuqing Gong,Guohao Yin,Yuyang Luo,Yongqiang Tian,Shuheng Chen,Jingbo Du,Jia Yang,Zhen Huang,De Chen
Ammonia decomposition is an appealing method for on-site hydrogen production, enabling ease of transportation and storage of H 2 . However, the high-temperature and hydrogen-rich environment present a challenge in developing highly efficient and stable catalysts. Hence, this study outlines an exsolution strategy for synthesizing a Ni-based catalyst in intimate contact with CeO 2 . The Ce 10 /NiAl 2 O 4 catalyst exhibits competitive catalytic performance for ammonia decomposition reaction, and achieves a hydrogen production rate of 78.3 mmol g cat −1 min −1 at 550 °C. Importantly, the robust structure of the Ce 10 /NiAl 2 O 4 catalyst ensures that no significant deactivation is observed during the 200-h stability test. HRTEM, XRD, TPD and kinetic studies reveals that the presence of CeO 2 enhances the dispersion of exsolved Ni nanoparticles, modulates the surface basicity of catalyst, reduce the reaction activation energy, promote the desorption of nitrogen/hydrogen species, and subsequently promotes NH 3 adsorption/activation capacity·NH 3 -TPD-MS in combination with in-situ DRIFTS demonstrate that CeO 2 could accelerate the recombination and desorption of N* adatoms, which is the rate limiting step, thereby significantly boosting catalytic performance. Furthermore, the DFT calculations reveal that the interaction between CeO 2 and Ni species facilitates electron transfer toward Ni, lowering the barrier for both N–H dissociation and N* recombination and desorption. This work not only presents an efficient and stable noble-metal-free catalyst for ammonia decomposition to generate hydrogen, but also provide a general strategy to engineer high-performance catalysts applicable to harsh catalytic environments.
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Shunnian Xu,Kuo Tang,Xiao Feng,Hongxu Gong,Gang Wang
Traditional hydrocracking faces challenges such as excessive alkane cracking, poor dealkylation selectivity and oversaturation of polycyclic aromatics (PAHs). This study developed a hydro-deconstruction catalytic system to precisely dissociate saturated and aromatic carbon structures while preserving product integrity. First, Al-modified dendritic mesoporous silica nanospheres (DMSNs- x , x is SiO 2 /Al 2 O 3 ratio) were synthesized as catalytic materials by hydrothermal method. The objective is to endow the material with suitable acidity and open mesoporous structures, enabling high selectivity for dealkylation and minimizing secondary cracking activity. The effects of aluminum doping on properties and precise dissociation performance of catalytic materials were systematically investigated. Increasing aluminum content enhanced acidity and shifted pore morphology from exterior-expanded mesopores to slit-like micropores. DMSNs-50 (0.28 mmol/g B acid, 15.7 nm pores) demonstrated outstanding alkyl positioning dissociation, achieving 68.4 % dodecylbenzene conversion with 86.5 % dealkylation selectivity, yielding 25.5 m% benzene and 26.8 m% C 9 -C 12 alkanes. Optimizing the active components for hydrogenation is essential to ensure moderate hydrogenation performance and maintain PAH structures. The 3 %CoMo-CM catalyst (3 m% MoO 3 , 0.7 m% CoO 2 ) showed optimal controlled hydrogenation, achieving less than 33 % conversion of phenanthrene, over 60 % selectivity of moderate hydrogenation, and more than 85 % retention of the PAH structure. Microstructural analysis of hydrogenation active phases indicates that the optimal sulfidation was about 38 %. At this point, the size and stacking number of formed MoS 2 slabs were 4.1 nm and 1.9 layers. This catalyst demonstrated excellent hydro-deconstruction for mixed hydrocarbons. It achieved 89 % dealkylation selectivity while retaining over 85 % long-chain alkane and 70 % aromatic ring. During reusability testing, the catalyst primarily deactivated due to the loss of B acid sites and the sintering of the hydrogenation active phase. This innovative catalytic system enables molecular-level transformation of petroleum resources, offering novel approaches for their efficient utilization.
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2026
·
IF 6.3
Peihui Xu,Kaipeng Chen,Rongrong Li,Longjin Du,Binghong Chen,Jianzhong Liu
Addressing the inhibitory influence of the oxide layer on the ignition and combustion of aluminium particles stands as one of the pivotal factors in facilitating its utilisation as an amphibious fuel. In this investigation, leveraging the distinctive properties of oxalic acid (OA), which is prone to decomposition and gas generation and holds substantial optimisation potential, surface modification of aluminium particles was conducted in conjunction with boron and magnesium particles. Al-based amphibious energetic composites (AEC) were thereby synthesised. Subsequently, their thermal behaviour, ignition and combustion characteristics, and action mechanism were investigated. The results indicate that the thermal behaviour of AEC samples encompasses dehydration, decomposition, and oxidation stages under amphibious atmospheres (namely, air, water vapour, and their mixtures). The atmosphere exerts a minimal influence on the thermal behaviour. Additives can remarkably enhance the ignition and combustion performance of aluminium particles. Owing to the readily decomposable OA and magnesium oxalate (OM) adsorbed on its surface and the highly reactive Mg particles, the ignition delay time of AEC in amphibious atmospheres is shortened by approximately 45–67 ms. Nevertheless, OA and OM merely function in particle dispersion. Consequently, the oxidising atmosphere in the environment has a substantial impact on the combustion performance of AEC samples. When O₂ is preponderant, the surface reactions of B and Mg clusters on the surface of aluminium particles release heat, thereby facilitating the combustion (the maximum combustion temperature is increased by approximately 600 K). When H₂O is dominant, this combustion-promoting effect diminishes. During combustion, the formation of metal oxides with high melting and boiling points, such as MgO, impedes the contact between the core active metals and oxidising gases, thereby reducing the self-sustained combustion performance of AEC samples. This research will offer crucial insights for the development and application of amphibious metal fuels.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2016
·
IF 3.997
Z.Y. Liu,K. Zhao,B.L. Xiao,W.G. Wang,Z.Y. Ma
A novel solution-assisted wet mixing processing was developed to efficiently produce CNT/Al composite powders . CNTs were firstly dispersed in zwitterionic surfactant aqueous solution, and then the flaky Al powders , produced from spherical Al powders by ball milling , were mixed with the CNT solution to adsorb the dispersed CNTs in the solution. It was indicated that CNTs could be uniformly adsorbed onto the flaky Al powders and CNT/Al powders with a maximum CNT concentration of 7.5 vol% could be obtained after filtering and drying. 1.5 and 3 vol% CNT/Al composites were then fabricated using the resultant composite powders through a powder metallurgy route. CNTs with average lengths of 0.9 μm and well-retained wall structure were uniformly dispersed in the Al matrix and aligned arrangement of CNTs was achieved after hot forging . Furthermore, it was found that most of CNTs were distributed at the grain boundaries and the CNT-Al interfaces were well bonded. The strengths of the CNT/Al composites were significantly increased, which could be attributed to the efficient load transfer of CNTs.
研究领域:
材料科学
·
纳米复合材料
·
粉末冶金
·
金属基复合材料
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Weikun Sun,Jiahui Zou,Yufang Liao,Can Li,Jian Zhang,Mohammad Younas,Zumin Qiu
A Zn dosage-mediated thermal reconstruction strategy was proposed to fabricate LDH@ZIF derived catalyst. • Moderate Zn addition achieves uniformly dispersed ZnCo 2 O 4 spinel. • Optimized LZ-0.2 removes levofloxacin rapidly through multiple ROS pathways involving 1 O 2 . • The catalyst realizes stable 144 h continuous degradation in fixed-bed reactor. Peroxymonosulfate-based advanced oxidation processes (PMS-AOPs) are effective for refractory antibiotic removal, yet conventional layered double hydroxide (LDH) catalysts often suffer from lamellar collapse, active site aggregation and poor pore accessibility after calcination. Herein, a series of LDH(Co/Al)@ZIF-8 derived catalysts (LZ-x) were prepared through the growth of ZIF-8 on LDH(Co/Al), followed by pyrolysis, for PMS activation and levofloxacin (LFX) degradation. Regulating the Zn dosage controlled ZIF-8 growth and the subsequent thermal reconstruction of the hybrid precursor. Among them, LZ-0.2 exhibited an open hierarchical architecture and the highest catalytic activity, achieving 95.11% LFX removal within 5 min with a k obs of 0.576 min −1 . In addition, structural characterization indicated that an appropriate Zn dosage favored the formation and dispersion of ZnCo 2 O 4 -containing spinel domains within the porous nanosheet architecture. Meanwhile, mechanistic investigations supported a hybrid radical/non-radical oxidation pathway involving 1 O 2 , •OH, SO 4 •- and • O 2 − . Additionally, the LZ-0.2 + PMS system maintained effective performance in various real water matrices and stable fixed-bed operation for 144 h in hospital wastewater, with low Co and Zn leaching. Moreover, phytotoxicity, antibacterial activity, and zebrafish developmental toxicity were reduced after treatment. This work highlights Zn-dosage regulation as an effective strategy for directing the thermal reconstruction of LDH@MOF derived catalysts for efficient PMS activation and antibiotic abatement.
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2023
·
IF 2.8
Songyuan Hao,Hong Yuan,Huiliang Zhou
Ni-Cu/Al-KCC-1 catalysts with different metal contents were prepared using fibrous nano-silica (Al-KCC-1) as a support. Field emission scanning electron microscopy observations showed that the spherical particle morphology and fibrous structure of the Al-KCC-1 were not changed after metal loading. Transmission electron microscopy images demonstrated that the introduction of copper improved the dispersion of the nickel, while X-ray diffraction and hydrogen temperature-programmed reduction confirmed the formation of a Ni-Cu alloy. The N2-Brunauer–Emmett–Teller specific surface areas of the catalysts were in the range of 269–378 m2/g and the average pore diameters were 7.988–12.078 nm. These Ni-Cu/Al-KCC-1 catalysts were used to promote the cracking of waste cooking oil model compound (WCOMC) to produce H2 and carbon nanotubes (CNTs), and the 10 wt% Ni-5 wt% Cu/Al-KCC-1 exhibited the highest catalytic activity. At a WCOMC flow rate of 0.04 mL/min and 750 °C, the instantaneous volume fraction of H2 reached 49.8 vol% and the content of H2 in the gaseous product was close to 71.4 vol%.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Zhe Zhou,Keyuan Pan,Duoyi Zhu,Xinkai Qian,Qiye Wang,Shiqi Yan,Qian Xin,Xuemei Dong,Yueyue Wu,Zhengdong Liu,Juqing Liu
Tuning memory windows is vital for cross-bar memory architectures with low power and free cross-talk. Herein, we demonstrate a synergistic interface/electrode nanoengineering strategy to tune memory windows for low power operation and enhanced electrical readout in polymer devices; this approach is workable for most insulating or semiconducting polymeric mediums. Through customizing the resistivity of selectively reduced graphene oxide nanoelectrodes, an inherent sub μA current is recorded in the programming storage state. The nanocavity of the polymer interface can reduce the switching voltage due to local electric field enhancement, thus leading to tunable memory windows. By stacking a selector onto the memory, the vertical architecture features dynamic memory kinetics, enabling cross-talk-free readout by suppressing sneak leakage current paths.
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Yunfei Hu,Xiangkang Cao,Xiaoze Ma,Jinglong Pan,Guangyi Cai,Xinxin Zhang,Zehua Dong
Recently, anti-corrosion coatings with auto-inhibition and self-reporting on their premature flaws are becoming more and more attractive. In this work, we engineered a cerium nitrate/8-hydroxyquinoline (Ce-HQ) hybrid pigment to endow epoxy coatings with corrosion self-inhibiting and fluorescent self-reporting performances via molecule design. The Ce-HQ pigments were synthesized by physical mixture and then dispersed into the commercial epoxy coating. Once the epoxy coating gets degraded, the underneath aluminum alloy matrix may corrode to produce Al 3+ ions, which can compete with Ce 3+ ions in the Ce-HQ complex, and then chelate with dissociative 8-HQ to form fluorescent Al-HQ complex, due to the higher bonding strength of Al 3+ with 8-HQ than Ce 3+ ions. Thus, not only the responsive releasing of Ce 3+ ions and 8-HQ can inhibit the underlying Al alloy, but the newly formed Al-HQ complex could indicate the location and severity of coating flaws through fluorescent emission under UV light. Electrochemical impedance evidenced that the composite epoxy coating containing 1 % mass Ce-HQ presents high corrosion resistance even after 504 h of salt spray test, showing 90 % corrosion refraining efficiency. This work may enlighten an approach to developing self-healing and self-diagnosis coating for premature corroded Al alloy beneath coatings via reactive release and fluorescent visualization.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2022
·
IF 5.907
Linxi Wang,Zhen Yang,Yutong Liao,Jianhong Luo
Industrial sewage containing oil and dye has already aroused the concerns of cosmopolites. Nowadays, membrane technology is regarded as the spotlight and highly-efficient treatment for various wastewater from human activities . Massive efforts have been put into newly synthesis of low-cost, eco-friendly, low energy consumption, reusable and robust Co-Al-Ce LDHs coated stainless steel mesh (SSM) for wastewater treatment . The CoAlCe-LDHs SSM was fabricated by facile hydrothermal method successfully. While the pristine SSM didn't exhibit selective wettability with water contact angle (WCA) of 114.5°, the novel CoAlCe-LDHs SSM possessed superhydrophilic and underwater superoleophobic property with underwater oil contact angle (UOCA) of 158.5°. The CoAlCe-LDHs SSM was compatibly applied to the separation of oil/water mixtures with highly separation efficiency above 99.5% and ultrafast water flux of 52.2 L·m −2 ·s −1 under gravity. The easily-fabricated CoAlCe-LDHs SSM was qualified with recyclable, stable and anti-fouling properties, which stayed effective for the separation of oil/water mixtures under at least 30 times recycle and harsh conditions. Moreover, the bifunctional CoAlCe-LDHs SSM also showed excellent photocatalytic activity of dye degradation (with 94.2% degradation of methyl orange solution within 160 min), which can be beneficial to sewage treatment .
✓ 已验证
产品关联
DOI
高影响因子
CORROSION SCIENCE
·
2023
·
IF 8.3
Jingbao Wang,Jingmao Zhao,Mohammad Tabish,Fan Shi,Baomin Fan,Lijun Peng,Qi Cheng
Filiform corrosion (FFC) challenges the application of Zn-Mg-Al coated steel (ZMA-steel). Herein, a self-healing coating loaded with functionalized mesoporous CeO 2 (mCeO 2 ) was developed to suppress FFC for ZMA-steel in saline media. mCeO 2 of large specific area readily accommodated benzotriazole and immobilized on g-C 3 N 4 generating a nanofiller (BTA@mCeO 2 /g-C 3 N 4 ) for epoxy matrix (EP). Strong barrier of lamellar g-C 3 N 4 , releasing BTA from nanofiller and generating Ce cations accounted for the long-term corrosion-resistance and self-healing effect of BTA@mCeO 2 /g-C 3 N 4 /EP system for ZMA-steel. Through taking full advantages of CeO 2 -based nanofiller, this work may provide an intelligent coating to solve FFC of ZMA-steel.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Jian-ming Gao,Bo Wang,Wenjie Li,Li Cui,Yanxia Guo,Fangqin Cheng
Preparation of inorganic polymer coagulants from circulating fluidized bed (CFB) fly ash is one of the most significant value-added and environment-friendly approaches. Nevertheless, CFB fly ash presents relatively low solubility in acidic systems, which limits its utilization efficiency. In this paper, enhanced metal leaching from CFB fly ash using combined HCl-H 2 SO 4 leaching process for polymeric aluminum ferric chloride sulfate (PAFCS) preparation was proposed. PAFCS with the different molar ratios of Al 3+ /SO 4 2− and Al 3+ /Fe 3+ were prepared from as-obtained leaching liquors and characterized by SEM, XRD, FTIR, and coagulation experiments. The leaching efficiencies of Al and Fe in CFB fly ash were up to 96.75% and 97.64% by combined HCl-H 2 SO 4 leaching process. The optimal molar ratios of Al 3+ /SO 4 2− and Al 3+ /Fe 3+ for the turbidity and UV 254 removal were 10:1 and 10:1, respectively, due to the three-dimensional chain-net structure and the highest [Al + Fe] b content. When applied to biochemical effluent of coking wastewater treatment, PAFCS exhibited excellent removal performance on both humic acid-like and fulvic acid-like matters. The resultant flocs of PAFCS presented the largest recovery factor (R f = 0.37) and strength factor (S f = 0.79) in contrast with PAC and PAFC. This work provides a novel and high-efficient Al and Fe leaching strategy from CFB fly ash to prepare Al-Fe coagulant.
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2022
·
IF 11.322
Kan Liu,Yishi Su,Xiaozhen Wang,Yunpeng Cai,He Cao,Qiubao Ouyang,Di Zhang
The incorporation of micro- and nano-sized SiC particles (micro- & nano-SiCps) into Al matrix constituted the micro- & nano-SiCp/Al composites through powder metallurgy . A unique ultrafine-grained (UFG) microstructure with micro-SiCps distributed among Al grains and most of nano-SiCps dispersed in grain interiors is characterized. Based on this, the synergetic constraint of dual-scale reinforcements on deformation of Al matrix is employed to enhance dislocation accumulation through increased SiCp/Al interface area and Orowan pinning effect, resulting in an improved strain hardening capacity. Compared with 10 vol% micro-SiCp/Al composites, the composites with 1 vol% nano-SiCps and 9 vol% micro-SiCps exhibit notable tensile properties of 285 MPa in yield strength , 374.7 MPa in ultimate strength and 11.3% in total elongation, increased by 32.6%, 28.7% and 37.8%, respectively, while remain a comparable Young's modulus of 94.6 GPa. Theoretical analysis proves that the dominant strengthening mechanism in micro- & nano-SiCp/Al composites is dislocation strengthening, different from the load transfer in individual micro-SiCp/Al composites. Our work provides inspirations for fabricating high-modulus Al matrix composites with simultaneously enhanced strength and ductility.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）