CATALYSIS TODAY
·
2025
·
IF 5.3
Jianbo Wang,Jianteng Yan,Qingyan Cui,Tiesen Li,Jie Shi,Tinghai Wang,Yuanyuan Yue,Xiaojun Bao
In order to gain insight into the influence of SiO 2 support particle size on the vacuum residue (VR) slurry-phase hydrocracking performance of Fe-based catalysts, a series of FeZn/SiO 2 catalysts with varying SiO 2 particle sizes were prepared. Characterization results show that the surface area and pore volume of the FeZn/SiO 2 catalysts increase with the reduction of SiO 2 particle sizes. The metals Fe and Zn species on FeZn/SiO 2 -S catalyst are more readily reducible via H 2 -TPR analysis. Notably, FeZn/SiO 2 -S catalyst presents higher metal dispersion and a greater degree of sulfurization compared to the other catalysts by XRD and XPS characterizations. Hydrocracking results demonstrate that the FeZn/SiO 2 -S catalyst achieves the lowest coke and gas yields (11.9 wt% and 0.4 wt%), respectively, and the highest VR conversion among these catalysts. The superior performance of the FeZn/SiO 2 -S catalyst in VR slurry-phase hydrocracking is ascribed to its enhanced hydrogenation activity, deriving from the higher dispersion and sulfurization of metals species. This suppressed the aggregation of polycyclic aromatic hydrocarbons in VR and the over-cracking of intermediate products. Additionally, the increased mesopore associated with smaller SiO 2 particles facilitates to the diffusion of large VR molecules, further promoting the hydrocracking reaction.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Ruizhen Liu,Huaiyuan Jiang,Ping Li,Jianfei Yin,Zhengrui Xu,Xiaoyu Chen,Jian Cheng,Shuangxi Gu,Renliang Lyu
Antibiotic pollution has posed environmental risks, and the crucial point lies in the elimination efficiency of antibiotics from wastewater. Herein, a ternary-structured B-TiO 2 /Bi 2 S 3 /PCs (photonic crystals) film, in which B-TiO 2 was a blend of anatase and rutile crystalline phases, was fabricated to evaluate the efficiency of antibiotic photodegradation under visible light irradiation. The synthesized B-TiO 2 (80 %)/Bi 2 S 3 /PCs(458) film exhibited superior photocatalytic efficiency of tetracycline hydrochloride (TC), with a degradation rate 7.56 times greater than that of pristine B-TiO 2 . These findings are closely related to the excellent photoelectron separation of the heterojunction between B-TiO 2 and Bi 2 S 3 , as well as the bandgap reflection effect and light localization effect of the PCs . Notably, the B-TiO 2 (80 %)/Bi 2 S 3 /PCs(458) film also displayed favourable degradation performance for ofloxacin (OFLX) and ciprofloxacin (CIP), with degradation rates of 83.98 % and 72.79 %, respectively. Active species trapping experiments and electron spin resonance (ESR) measurements revealed superoxide radicals (•O 2 − ) and photogenerated holes (h + ) as the main active species. Furthermore, potential photodegradation pathways were proposed by analyzing the degradation intermediates of TC and OFLX via liquid chromatography-mass spectrometry (LC–MS). In a word, the B-TiO 2 (80 %)/Bi 2 S 3 /PCs(458) film exhibited high efficiency in the treatment of antibiotic pollutants, thereby offering promising prospects for practical application.
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Zilin Yi,Liang Fang,Xuetai Yu,Xiang Cheng,Chunhua Lu,Zhongzi Xu
Chlorophyll (Chl), a natural pigment with significant applications in functional coatings, food processing and biomedical fields, suffers from poor photostability under light and oxygen exposure, limiting its practical use. Herein, a novel chlorophyll/epoxy@SiO 2 (Chl/EP@SiO 2 ) microsphere with a lychee-like core-shell structure was synthesized via Pickering emulsion polymerization. The modification level and amount of SiO 2 were systematically optimized, yielding microspheres with an average particle size of ∼15 μm and a shell thickness ranging from 0.9 to 1 μm. Two distinct preparation strategies were investigated: (i) incorporating Chl during emulsification step by premixing with bisphenol A diglycidyl ether (DGEBA) to produce ChlD/EP@SiO 2 microspheres, and (ii) introducing Chl during curing phase by mixing with m-xylylenediamine (MXDA) to form ChlM/EP@SiO 2 microspheres. ChlD/EP@SiO 2 microspheres exhibited uniform particle size distribution, with Chl showing no interference with the diffusion of MXDA or the curing reaction. Conversely, the diffusion of Chl in the curing process disrupted the SiO 2 adsorption equilibrium, leading to particle rearrangement, surface roughness, and non-uniform particle size distribution in ChlM/EP@SiO 2 . Reflectance spectra and colorimetric analysis during photostability tests demonstrated that ChlD/EP@SiO 2 microspheres, used as fillers in polyurethane coatings, enhanced Chl photostability by 11-fold compared to unencapsulated Chl. Furthermore, encapsulating Chl within an epoxy core and SiO 2 shell improved its dispersion in waterborne polyurethane coatings. This lychee-like core-shell composite microsphere provides a promising platform for stabilizing and dispersing organic pigments in coating applications.
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Chengmin Hou,Ze Fan,Jiaqi Yang
Most of the super hydrophobic paper surfaces prepared at present will change the original properties of the paper and can not be used for oil-water separation continuously. There is not yet much systematic research on super hydrophobic modification of paper-based materials. The use of polymers and inorganic fillers for synergistic modification is also relatively rare. In this paper, fluorine-containing epoxy polymer P(GMA- r -DFMA) and KH550 modified nano-SiO 2 were mixed to obtain an organic-inorganic hybrid super hydrophobic solution, which was chemically cross-linked to the surface of paper fibers to form a micro- and nano-thin coating to construct a super hydrophobic surface , but the original properties of the paper remain unchanged. The optimal parameters (polymer concentration, soaking time, drying time, drying temperature) for building super hydrophobic surface on paper were explored, and the optimal conditions are the polymer concentration of 7 mg/mL, soaking time of 5 h, drying time of 6 h, drying temperature of 100 °C. Under the optimum conditions, the water contact angle of the modified paper surface is 164 ± 2 o and the water rolling angle is 5 ± 2 o . The surface of the super hydrophobic modified paper contaminated with toner can be self-cleaned by water droplets. Compared with the unmodified paper, the whiteness, smoothness and glossiness of the surface of the super hydrophobic modified paper have not changed greatly. When the oils were n -hexane, n -octane and trichloromethane, the oil-water separation efficiency of the modified paper could reach 99.9 %, 99.9 % and 98 %, and the effects were stable. Super hydrophobic modified paper in water formed a large number of bubbles on its surface, resulting in silver mirror phenomenon. SEM results showed that the pore structure of the paper was not changed after modification. The surface of the original paper fiber is very smooth, but the surface of the super hydrophobic modified paper fiber has a large number of micro and nano protrusions.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Mengchuan Li,Tongsheng Zhang,Rensheng Li
The thermodynamic data of rare earth-containing systems are crucial for the development and application of permanent magnets, optoelectronic materials, high-temperature superconducting materials, and catalysts. In this study, the equilibrium phase compositions of the CaO-Ce 2 O 3 -SiO 2 -(5∼25 wt%) Al 2 O 3 system at 1873 K were investigated through high-temperature equilibrium experiments. The equilibrium phase compositions at 1873 K were determined using SEM, XRD, and EPMA, leading to the construction of isothermal sections. For the CaO-Ce 2 O 3 -SiO 2 -5 wt% Al 2 O 3 system, the isothermal cross-section diagram revealed a liquid phase region, four distinct two-phase equilibria, and two different three-phase equilibria. As the Al 2 O 3 content increased to 25 wt%, the isothermal cross-section diagram showed a liquid phase region, five different two-phase equilibria, and three distinct three-phase equilibria. The experimental results provide valuable insights for further research on the practical applications of cerium-containing rare earths in various fields.
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Menghan Guo,Jie Ding,Guojing Ji,Tian Xie,Huiwen Pang,Xiang Li,Qin Zhong
Ethyl glycolate (EGly) is a platform molecule in various fields, which has been widely applied for the production of various valuable chemicals. Despite being a traditional catalyst for the conversion of diethyl oxalate (DEO) to EGly, Ag/SiO 2 catalyst exhibits insufficient activity. The present study introduces a novel preparation method that couples H 2 O 2 reduction with deposition precipitation to augment the performance of the catalyst. Performance results show that Ag/SiO 2 catalyst prepared by the new method attains a DEO conversion of 95.6% and an EGly selectivity of 78.0%, showing respective improvements of 10.0 and 15.2% over excess impregnation-evaporating solvent method. Characterization results show that the average silver particles size of Ag/SiO 2 catalyst prepared by the new method is 6 nm, which is 1/2 of the excess impregnation-evaporation solvent method. Simultaneously, it contains a greater quantity of Ag 0 . The smaller and more uniform particles offer greater active site density, leading to enhanced DEO conversion. An increased presence of Ag 0 diminishes DEO overactivation and inhibits the dissociative adsorption of H 2 . Moreover, the amplified quantity of Ag 0 could be attributed to the reduced interfacial charge transport triggered by metal-support interactions (MSIs).
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Shiha Huang,Bin Ya,Bingwen Zhou,Yunfeng Liu,Xingguo Zhang
The application of Fe-based amorphous microspheres in high-performance electromagnetic wave absorbing materials is significantly limited by a single loss mechanism. Utilizing interfacial engineering and magnetic-dielectric synergistic effect is a viable approach to enhance microwave absorption. In this work, FeSiBCuNbZr amorphous microspheres were synthesized using single copper roller melt-spinning method and ball mill method. The finding reveals that the incorporation of SiO 2 and TiO 2 (B) (bronze phase TiO 2 ) shells notably enhances polarization loss and conductive loss. FeSiBCuNbZr@SiO 2 @TiO 2 (B) amorphous composites exhibited a minimum reflection loss value of −64.89 dB at a thickness of 2.17 mm and an effective absorption bandwidth (EAB) of 8.08 GHz covering 9–18 GHz at a thickness of 1.9 mm. The exceptional wave absorption performance is ascribed to the combined effect of magnetic loss in the FeSiBCuNbZr amorphous core and dielectric loss from the double-shell structure, while maintaining favorable impedance matching. This work provides a new core–shell FeSiBCuNbZr amorphous composites for efficient electromagnetic wave absorption.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Yinhe Hai,Tong Guan,Yibin Feng,Ziheng Zhen,Youwei Yang,Ying Hu,Jing Lv,Yue Wang,Xinbin Ma
A promising route for producing biodegradable polyglycolic acid material from syngas has garnered increasing attentions. In this route, one of the pivotal issues is developing favorable catalysts for semi-hydrogenation of dimethyl oxalate (DMO) to methyl glycolate (MG). Silver catalysts were reported to be effective but suffered from the high cost. Herein, we prepared small-sized Cu@Ag/SiO 2 catalysts with appropriate Ag/Cu ratios by a facile wet impregnation method. This core–shell structure facilitated the intermetallic electronic transference from Cu to Ag. The surface exposure of electron-rich silver species could promote the catalytic activity and MG desorption in the DMO hydrogenation, which achieved high efficiency without compromising the MG selectivity. The optimal catalyst with Ag/Cu mass ratio of 3/2 displayed excellent space time yield towards MG of 47.3 g·g Ag −1 ·h −1 . These insights could offer a potential strategy to reduce the silver-based catalyst cost for the semi-hydrogenation of DMO to MG.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Zhuoshi Li,Yinhe Hai,Yibin Feng,Tong Guan,Tiantian Xiao,Jing Lv,Shouying Huang,Yue Wang,Xinbin Ma
Methyl glycolate (MG) is an important building block for synthesizing biodegradable material of polyglycolic acid. Hydrogenation of coal-based dimethyl oxalate (DMO) to MG is quite promising, where Ag-based catalysts exhibited excellent selectivity. Here, a series of Ag/SiO 2 -x catalysts with particle sizes of 1.4–13.5 nm were prepared, which showed significant structural sensitivity in DMO hydrogenation. For Ag nanoparticles of 1.4–2.7 nm, the turnover frequency (TOF) was linearly increased with the surface electron density of silver, but when the Ag nanoparticles further enlarged, no significant variation of TOF was observed. Combining DFT calculation and experimental results of the model catalyst, triangular nanoplate, it was deduced that the Ag (1 1 1) played a dominant role in DMO hydrogenation to MG, originating from the benefited MG desorption as well as promoted dissociation of H 2 and DMO. This understanding about Ag particle size effect may provide guidance for designing efficient catalysts for DMO hydrogenation to MG.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2024
·
IF 3.9
Li Zhao,Shulai Lu,Ming Chen,Yuchao Wang,Shicheng Zhao
The stability of agglomerating agent is an important parameter to evaluate its value, which is of great significance for its subsequent transportation, storage, and practical application. In this study, a highly stable agglomerating agent synergistically stabilized by sodium dodecyl sulfate (SDS) and SiO 2 was synthesized. The stabilization mechanism of the agglomerating agent and its agglomeration effect on polybutadiene latex (PBL) were studied. First, the mean particle size, particle size distribution, interfacial tension, and viscosity of the agglomerating agent emulsion stabilized by SDS/SiO 2 has been investigated and compared with those of conventional emulsion stabilized by SDS. The results show that when the SDS concentration is lower than 0.125%, the presence of SiO 2 can significantly increase the anticoagulation ability of agglomerating agent particles in the polymerization process. Furthermore, noting that agglomerating agent emulsions stabilized by SDS/SiO 2 exhibited high stability even pH, centrifugation, storage, and temperatures changed in wide range. In addition, the stability of the agglomerating agents synergistically stabilized by surfactants and SiO 2 nanoparticles is better than using them alone. Then, the stability mechanism of SiO 2 in the agglomerating agent was investigated. The results revealed that the SiO 2 particles are tightly adsorbed on the surface of the agglomerating agent particles through hydrogen bonding and play a physical isolation role. Finally, the 100 nm PBL was enlarged to 469 nm by a synthetic agglomerating agent. Surprisingly, the SiO 2 particles show excellent physical isolation role, not only in agglomerating agent but also in agglomerated PBL. Our findings provide novel insights into the synthesis of highly stable agglomerating agent and improve the practical application significance of subsequent PBL agglomerations and ABS properties. Graphical
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Qiang Zhang,Zhongtian Yang,Yage Xia,Junxu Chen,Yanzheng Ji,Juan Li,Huimin Liu,Xinquan Yu,Youfa Zhang
Slippery liquid-infused porous surfaces (SLIPS) have excellent hydrophobicity, low adhesion, and self-healing, showing potential applications prospects in the fields of self-cleaning, anti-corrosion, anti-biofouling, and drag reduction. However, the current SLIPS surface has problems such as complicated preparation process and easy loss of lubricant, which seriously restricts its practical application. In this paper, hydrophobic modified superhydrophobic diatomaceous earth@SiO 2 cell loaded with silicone oil were firstly prepared, and then mixed with polyurea resin and curing agent to prepare a novel slippery lubricated oil-infused anti-corrosion and anti-fouling polyurea coating (SLIC).The impedance modulus (|Z| 0.01 Hz ) of the SLIC-coated Q235B steel plate in simulated seawater (3.5 wt% NaCl aqueous solution) reaches 10 10 Ω·cm 2 order of magnitude; Additionally, the glass samples coated with SLIC coatings showed only 0.18 % bacteria coverage rate after 72 hours of incubation in E. coli culture solution, and only 0.10 %, 0.29 % and 0.53 % coverage of Chlorella after 5, 10 and 15 days of incubation in Chlorella culture solution. The SLIC coatings are also simple to prepare, low-cost, and versatile, with excellent robustness, durability and self-cleaning, thereby presenting potential application prospects in the fields of ships and marine engineering.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xueai Li,Kexin Jin,Xiangyan Qu,Yuning Shi,Chunsheng Wang,Wanchun Guo,Kesong Tian,Yahui Wang,Haiyan Wang
The dispersion of diverse magnetic metallic in a single particle plays an important role in microwave absorption; however, its contribution is not clear due to the challenge of controllable synthesis of magnetic bimetallic nanoparticles in one micro/nanostructure. Herein, a series of magnetic bimetallic nanoparticles separately confined growth in a hollow multi-shell microsphere with proper impedance matching characteristic were prepared, which can be used as theoretical models to elucidate magnetic coupling effect between diverse magnetic metallic nanoparticles in a single particle on electromagnetic attenuation. The coupling effect of magnetic Co and Fe nanoparticles dispersed in different shell effectively enhance the microwave absorption performance of void@Fe@SiO 2 /Co/C particles with minimum reflection loss (RL min ) of −62.3 dB (RL=-20 dB, 99 % absorption) at a thickness of 2.05 mm, provoking the maximum radar cross-section (RCS) reduction value of perfect electric conductor (PEC) 37.37 dBm 2 . Meanwhile, broad effective bandwidth (EBW, RL≤-10 dB, ≥90 % absorption) response of 7.04 GHz at a thickness of 2.44 mm was achieved. These findings can provide guidance for the designation of novel magnetic broadband microwave absorbing materials (MAMs).
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）