ChemistrySelect
·
2023
·Vol. 8
·期 31
·e202300799
·
IF 2.1
Lin-Jie He,Yao-Feng Wang,Peng-Xin Guan,Qing-Shan Niu,Hong-Ying Liu,Bao-Hua Xu
The vapor-phase nitrilation of dimethyl adipate (DMA) with ammonia (NH 3 ) is an environmentally benign route leading to adiponitrile (ADN) with great application value. In this study, the performance of HZSM-5 zeolites, widely used in industry as the solid acid catalysts, was investigated. It exhibits a strong correlation between the SiO 2 /Al 2 O 3 ratio (SAR) in HZSM-5 zeolites and the reactivity (both activity and selectivity). The influence of Al density closely related to the value of SAR on the reactivity of HZSM-5 was thus elucidated by mechanistic experiments. As a result, the introduction of Al element to the framework is beneficial to the activation of ester functionality, thus improving the activity, especially at a high liquid hourly space velocity (LHSV). However, a high Al density will lead to poor selectivity and deactivation due to too strong adsorption of esters and intermediates (e. g., amides). Herein, the balanced adsorption/desorption capability was reached on HZSM-5 with SAR as 631 (i. e., HZSM-5-631), which provides the best selectivity to nitriles (S ADN+MCP , 92.5 %) at a high single-pass conversion of DMA (C DMA , 98.0 %). Graphical The nitrilation of DMA over HZSM-5 with different SiO 2 /Al 2 O 3 was investigated, wherein HZSM-5 with SiO 2 /Al 2 O 3 of 631 exhibited excellent reactivity due to the balance of ester activation and amide intermediate desorption.
研究领域:
催化化学
·
化学工程
·
绿色化学
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材料科学
·
有机合成
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DOI
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2026
·
IF 3.1
An Zhuoqing,Liang Weiwen,Gao Yuan,Chen Jiajing
The viscosity of the CaO–MgO–Al 2 O 3 –SiO 2 system containing La 2 O 3 and Fe 2 O 3 was measured by rotation, hot-stage microscopy and hot-stage load methods to investigate the rheological behavior across multiple temperature ranges. In-situ high temperature Raman spectroscopy was employed to quantitatively analyze the microstructure. The results show that with the La 2 O 3 /Fe 2 O 3 ratio varying from 2/0 to 0/2, the viscosity decreases gradually through the multiple temperature ranges, and the viscous flow activation energy also gradually decreases. As the ratio of La 2 O 3 /Fe 2 O 3 decreases, the relative contents of Q 0 , Q 1 and Q 2 increase gradually, and the relative contents of Q 3 and Q 4 decrease significantly. This indicates that both La 2 O 3 and Fe 2 O 3 act as network modifiers and simplify the glass network structure, resulting in a decrease in the degree of network polymerization and viscosity over the multiple temperature range. Compared to La 2 O 3 , Fe 2 O 3 is a more effective network modifier, as it breaks up the silicate network more efficiently and results in a lower overall viscosity. In addition, the microstructure of the melts was quantitatively analyzed by NBO/ T , and a quantified relationship among viscosity, microstructure and temperature was given.
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高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Yuting Wang,Ying Xiong,Hui Tian,Shi Wang,Qianying Zhang,Mingjing Zhang,Hong Ding,Ye Gu,Anlin Peng
A novel disposable sensor modified with MWNTs/Al 2 O 3 /poly-L-lysine film was developed for detection of clinical 17β-estradiol (17β-E 2 ) urine samples in this study. The electrochemical behavior of 17β-E 2 was greatly increased due to the good electrocatalytic activity of MWNTs/Al 2 O 3 /poly-L-lysine nanocomposites. The optimum experimental conditions such as scan rate, pH, accumulation time were obtained, and the peak potentials of 17β-E2 was explored at about 530mV. The peak current of 17β-E 2 measured by CV displayed the good linear property with the increasing of the concentrations. Under optimized conditions, the disposable sensor displayed excellent analytical performance with linear ranges of 17β-E 2 from 0.5nM to 50nM. And a very low detection limit of 0.014 nM was attained. Furthermore, the MWNTs/Al 2 O 3 /poly-L-lysine SPE was used to the rapid and successful determination of the hormone in spiked synthetic and real clinical pregnant woman urine samples with wonderful selectivity and sensitivity.
研究领域:
生物医学工程
·
临床检验医学
·
分子诊断学
·
电化学分析
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纳米生物技术
·
激素检测
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Jingjing Liu,Bo Ren,Yedong Rong,Yi Zhao,Lu Wang,Yuju Lu,Chao Wang,Guolong Sang,Jinlong Yang
Engineering high performance cellular ceramics with both ultralow density and satisfactory compressive strength for practical applications still represents a grand challenge. Herein, alumina-based cellular ceramics bonded by in-situ formed mullite phase were constructed by Al 2 O 3 –Si-boehmite particle-stabilized foams. The gelation of boehmite sol improved the stability and harnessed the deformation of dried Al 2 O 3 –Si composite foam. The oxidation of silicon and further generation of in-situ mullite phase enhanced the chemical bond between alumina particles on cell walls, resulting in the superior mechanical properties. As an exemplar, the resulting cellular ceramic possessed the robust compressive strength of 2.26 MPa at a high porosity of 87.8%. The gelation-assisted Al 2 O 3 –Si particle-stabilized foams provide a facile and convenient strategy for construction of composite ceramic foams with high porosity and robust strength.
研究领域:
材料科学
·
无机非金属材料
·
多孔材料
·
陶瓷工程
·
结构功能一体化材料
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2026
·
IF 3.9
Qi Zeng,Xinyi Xie,Cuilian Zhu,Lili Hu,Bo Xiao,Shupeng Guo,Bo Hou,Lili Liu,Min Zhong
The SiC NP-modified high thermal conductivity Co/Al2O3@Al Fischer–Tropsch synthesis (FTS) catalyst has been proven to significantly enhance catalytic activity and selectivity toward long-chain hydrocarbons (C5+), but the underlying mechanism responsible for this promotional effect remains unclear. In this study, commercially available SiO2 NPs are used as a substitute for SiC NPs to prepare a cost-effective SiO2-modified Co/Al2O3@Al catalyst (Co/AS-O) for improved FTS performance, serving as a reference to elucidate the unique role of SiC NPs in enhancing FTS performance. Systematic characterizations demonstrate that SiC promotes the formation of the hexagonal close-packed (HCP) Co phase, yielding a higher intrinsic activity. In contrast, the face-centered cubic (FCC) Co phase predominates in the Co/AS-O and an unmodified reference catalyst (Co/A-Y). Although both modified catalysts exhibit enhanced CO conversion, the superior activity of the SiC NP-modified catalyst (Co/AS-C) stems from an increased density of active sites and its higher intrinsic activity, as evidenced by a higher turnover frequency (TOF). In contrast, the enhancement for Co/AS-O is solely due to a greater number of exposed Co0 sites. Moreover, the incorporation of NPs enhances *CO adsorption and restricts the activity of surface *H species, collectively establishing a *C-rich microenvironment that promotes chain growth and olefin formation. This study provides a fundamental understanding of how inert NPs modulate the FTS performance of the thermally conductive Co/Al2O3@Al catalyst.
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高影响因子
Catalysis Science & Technology
·
2026
·
IF 4
Jiming Wang,Min Ji,Min Wang
Photo-thermo-chemical dry reforming of methane (PTC-DRM) presents advantages over thermocatalytic DRM by storing solar and thermal energy as chemical energy, yet maintaining high efficiency and stability remains a challenge. Herein, we report an efficient PTC-DRM process on Ni–Co–Ce–Al catalysts and investigate the synergistic effect of Ni and Co on reaction performance. Characterization results revealed that the introduction of Co increases the concentration of acidic sites on the Ni-based catalyst surface. An appropriate number of acidic sites facilitates the DRM reaction. Co-incorporated catalysts demonstrate excellent light responsiveness, and generate more energetic hot charge carriers under light irradiation. Density functional theory (DFT) calculations confirm that the interfacial electronic structure of the Ni–Co–Ce–Al catalyst facilitates spontaneous electron transfer from CeO2 to NiCo bimetallic quantum dots (QDs), which is mediated by the built-in electric field at the metal–semiconductor interface—attributed to the inherent work function difference between CeO2 (5.45 eV) and NiCo alloys (4.93 eV). The incorporation of an optimal amount of Co significantly improves the catalytic performance, with the Ni0.9–Co0.1–Ce–Al catalyst exhibiting the highest thermal and photocatalytic activity. At 650 °C, the conversions of CH4 and CO2 increased from 55.8% and 60.1% under dark conditions to 65.1% and 67.9% under light irradiation, respectively. Accordingly, the yields of H2 and CO increased from 21.4 and 26.5 μmol min−1 g−1 to 23.6 and 27.7 μmol min−1 g−1. This study demonstrates that the synergy between bimetallic components coupled with photothermal integration can effectively enhance DRM efficiency and coke resistance, providing a valuable catalyst design strategy for solar-driven conversion of carbon resources.
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高影响因子
BIORESOURCE TECHNOLOGY
·
2026
·
IF 8.2
Zuhang Jin,Yiwei Zhao,Cheng Tao,Rui Du,Yongzheng Shi,Chao Zhang
PdZn/Mo-Al 2 O 3 -C effectively catalyzed hydrodeoxygenation (HDO) of fatty acid esters to alkanes. • Coexistence of Pd and Zn enhanced the dispersion of active sites and regulates the distribution of acid sites. • ZnO x and MoO x species adjacent to Pd suppressed the decarboxylation side reaction. • 92% octadecane selectivity was achieved in methyl stearate HDO. The conversion of fatty acid esters to alkanes with high carbon chain number by hydrodeoxygenation (HDO) is of great significance in biomass conversion to fuels and chemicals. A PdZn/Mo-Al 2 O 3 -C catalyst was prepared for the preparation of octadecane from methyl stearate HDO. The coexistence of Pd and Zn on Mo-based catalysts greatly promoted the dispersion of active sites on the catalyst surface, which also effectively regulated the distribution of acid sites on the catalyst surface. The Zn modified Pd catalyst also effectively adsorbed the C O/C–O bond of the substrate to facilitate the cleavage of C–O bonds, as well as suppressing the decarboxylation side reaction, and achieving octadecane selectivity of 92%. The optimized catalyst also displayed high HDO selectivity for converting the fatty acid esters (C 8 ∼ C 18 ) to alkanes. Download: Download high-res image (166KB) Download: Download full-size image
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高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2018
·Vol. 124
·期 2
·587-601
·
IF 1.515
Wang Tao,Zhang Xinyu,Liu Jun,Liu Hanzi,Sun Baomin
NO conversion using dielectric barrier discharge (DBD) plasma with different catalysts was investigated. Cu/TiO 2 , Cu/Al 2 O 3 , Cu/ZSM-5, Cu/CNTs and Cu/AC catalysts were prepared by incipient wetness impregnation with 4 wt% Cu loaded. BET, SEM, XRD, XPS, H 2 -TPR, NH 3 -TPD were used to measure and evaluate various catalysts. Compared with the plasma only process, the combination of plasma with different catalysts significant improved the NO conversion rate. The highest NO conversion rate of 76% could be achieved with Cu/ZSM-5 catalyst at the energy density of 184 J/L. The results indicate that Cu species over the support ZSM-5 can produce high concentrations of CuO, largest specific surface area, largest amounts of acidity and lowest reduction temperature (209 °C), these factors conducive to plasma-catalyst reaction. Besides, Cu/TiO 2 and Cu/Al 2 O 3 catalysts exhibited excellent NO conversion at the low energy density because of the low thermal stability. After plasma-catalyst reaction, the reducibility of CuO and Cu 2 O over supports decreased and the peak position of acid sites shifted to lower temperature.
研究领域:
环境科学
·
催化化学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Zhixin Yao,Yuandong Peng,Chao Xia,Xuwu Yi,Shenghua Mao,Miantuan Zhang
The effect of calcination temperature on the coating layer and the phase of the alloy matrix is the main problem to improve the heat treatment process of SMCs and obtain excellent magnetic properties . In this study, FeNiMo@Al 2 O 3 powders which were coated by sol-gel and calcined at 900–1300 °C were prepared and these powders were pressed into SMCs. The results showed that the surface of the powder was uniformly coated with Al 2 O 3 . As the heat treatment temperature increases, the phase of the coating changed from AlOOH to γ-Al 2 O 3 , δ-Al 2 O 3 , θ-Al 2 O 3 , and α-Al 2 O 3 . Meanwhile, the new phase γ-Fe, Ni appeared in the alloy matrix. The magnetic permeability of the sample is very stable in the frequency range of 10–500 kHz. The magnetic loss decreases first and then increases, with a minimum at 1100 °C. The permeability and magnetic loss of the sample pressed from the powder obtained by calcination at 1100 °C are 321.78 mw/cm 3 and 87.61 (50 kHz, 100 mT) at the typical industrial application conditions of Iron–Nickel SMCs. The microstructure and the magnetic properties show that the obtained α-Al 2 O 3 have excellent insulation and heat resistance. This resulted in a significant reduction in core losses of FeNiMo SMCs.
研究领域:
材料科学
·
磁性材料
·
无机非金属材料
·
粉末冶金
·
功能材料
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DOI
高影响因子
IONICS
·
2015
·Vol. 21
·期 7
·1937-1943
·
IF 1.754
Rao Mumin,Li Xiaogang,Liao Youhao,Li Xiaoping,Li Weishan
A novel gel polymer electrolyte (GPE) based on an electrospun polymer membrane of polyimide (PI) activating with poly(vinylidene fluoride- co -hexafluoropropylene) (PVDF-HFP) and further coating with nano-Al 2 O 3 was prepared, and its performance for lithium-sulfur (Li-S) cell was investigated. It is found that the Li-S cell using the new GPE enabled achieving a stable discharge capacity of 820 mAh g −1 after more than 100 cycles. This new GPE system with activating with PVDF-HFP and further coating with nano-Al 2 O 3 was capable of upholding the electrolyte solution and can suppress the dissolution of the intermediate products generated during the discharge process and thus improves the performance of Li-S cell.
研究领域:
材料科学
·
储能技术
·
高分子化学
·
电化学
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DOI
高影响因子
Catalysts
·
2023
·Vol. 13
·期 5
·800
·
IF 3.9
Zhong Xie,Jinpei Hei,Lei Cheng,Jing Li,Xiaojie Yin,Sugang Meng
CO2hydrogenation to methanol was conducted using a set of activated carbon-supported Cu/ZnO/Al2O3catalysts (CCZA) prepared by an incipient wetness impregnation approach. The effect of the Cu/Al ratio on the physicochemical properties of the catalysts, as well as their catalytic performance, were investigated. As Cu/Al ratio increased, the metallic Cu surface area displayed a reducing trend from 6.88 to 4.18 m2∙gcat−1, while the CO2adsorption capacity exhibited an increasing trend. Meanwhile, aluminum content will have an important effect on the catalysts’ reducibility and, thus, on their catalytic performance. The CCZA-2.7-de catalyst demonstrated the highest selectivity to methanol at 83.75% due to the excellent distribution and synergistic effect of copper and zinc. Although the CO2conversion of CCZA-2.2-de and CCZA-3.5-de exceeded 10%, the CH3OH selectivity was less than 60%, which may be attributed to the larger particle sizes of ZnO and poor interactions in Cu–Zn. The present study offers a novel approach to increase the number of active sites, optimize the activated carbon-aided Cu/ZnO/Al2O3catalyst’s composition, and finally elucidate the mechanism for CO2hydrogenation to methanol.Keywords:CO2hydrogenation;CuO/ZnO/Al2O3catalyst;methanol synthesis;carbon-supported catalyst;thermocatalysis
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高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Liyu Chen,Jiaxin Yang,Yifan Zhang,Shaohua Wu,Youjian Yang,Wenju Tao,Jiangyu Yu,Zhaowen Wang
The electrochemical behavior of Zr(IV) on a molybdenum (Mo) electrode in a KF-AlF 3 -Al 2 O 3 -ZrO 2 molten salt system was studied using cyclic voltammetry (CV), square-wave voltammetry (SWV) and chronopotentiometry (CP). The reduction process of Zr(IV) was found to follow a two-step, two-electron transfer mechanism: Zr(IV)+2e − →Zr(II) and Zr(II)+2e − →Zr(0). The reduction process was quasi-reversible and controlled by diffusion. Al-Zr alloys were successfully obtained on Mo and liquid aluminum electrodes by potentiostatic electrodeposition . Flower-like AlZr 3 and irregular granular Al 3 Zr were obtained on the Mo electrode, which were mainly attributed to the electrochemical co-reduction of Al(III) and Zr(IV) in the molten salt. Three Al-Zr alloy phases, Al 3 Zr , Al 3 Zr 2, and Al 2 Zr, were obtained on the liquid aluminum electrode, among which Al 3 Zr was dominant in the product, followed by Al 3 Zr 2 .
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高影响因子
危险品化学品经营许可证（带存储）