CHINESE JOURNAL OF CATALYSIS
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2020
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IF 6.146
Rui Liu,Chunlei Pei,Xianhua Zhang,Sai Chen,Hongfang Li,Liang Zeng,Rentao Mu,Jinlong Gong
This paper describes the design of a FeWO x -based oxygen carrier for the chemical partial oxidation of methane (CLPOM). Thermodynamic screening and kinetic analyses both forecast the FeWO x -based oxygen carrier as a promising candidate for the production of syngas. The total methane conversion and syngas yield can be dramatically increased with this catalyst compared to the case with the unmodified WO 3 /SiO 2 , thereby enabling CLPOM with 62% methane conversion, 93% CO gas-phase selectivity, 94% H 2 selectivity, and a 2.4 H 2 /CO ratio. The catalyst has the advantages of high availability of lattice oxygen to oxidize carbonaceous intermediates in time, together with the formation of an Fe-W alloy to promote the surface reaction. Consequently, it demonstrates excellent catalytic performance with no catalyst deactivation at 900 °C and 1 atm. The excellent structural stability plays an essential role in CLPOM. As revealed via XPS and ICP, the phase segregation has not been observed due to the strong interaction between Fe and W, which resulted in the formation of the Fe-W alloy during the reduction processes and the match between the ion oxidation rates of the Fe and W ions in the oxidation stage. The results provide fundamental information on the reaction mechanism of FeWO x /SiO 2 , and present it as a promising candidate for CLPOM.
研究领域:
化学工程
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催化科学
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DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Xinke Li,Xinru Wang,Xing Wang,Hanwen Xin,Xujie Yang,Jinghui Zhou,Dayin Sun
Properly cleansing the skin surface plays a crucial role in maintaining the overall body health. Incorporating nanoparticles into skincare products can enhance deep cleansing applications of the skin within the complex system formed by epidermal secretions. This study presents a nanoparticle cleansing tool, namely, patchy structure lignin composite nanoparticles. Lignin, a natural polymer, exhibits the ability to self-assemble into ultrasmall nanosized particles when exposed to a suitable solvent. Meanwhile, the surface of traditional SiO2 clean powder can be modified using rapid grafting techniques to create patchy structures. When these nanoparticles, featuring a patchy microconvex structure, come into contact with the skin, they exhibit stronger friction performance compared to hydrated silica with a smooth surface. As a result, an interlocking state forms among the nanoparticles, facilitating the removal of complex skin systems through the formation of a nanoparticle chain network. This ultimately leaves the skin cleaner and fresher. The unique composition and structure of these patchy composite nanoparticles provide an innovative approach to the development of cleansing products.
研究领域:
材料科学
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生物学
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皮肤病学
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产品关联
DOI
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2026
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IF 3.3
Xiao Yang,Zhou Huarui,Wei Junyu,Tang Zhaoyi,Qian Kun,Wang Ning,Zhao Baojun,Liao Jinfa
With the increasing use of high-alumina iron ores in blast furnace ironmaking, the Al 2 O 3 content in the slags has gradually risen to 15 to 20 wt pct, significantly affecting the phase equilibria and flow properties of the slag system. In this study, the phase equilibria in the CaO–MgO–Al 2 O 3 –SiO 2 quaternary system with a fixed Al 2 O 3 /SiO 2 mass ratio of 0.5 (representative of typical high-Al 2 O 3 blast furnace slags) were systematically investigated using high-temperature equilibration and quenching experiments combined with electron probe microanalysis (EPMA). A pseudo-ternary phase diagram CaO–MgO–(SiO 2 +Al 2 O 3 ) was constructed. At a fixed (SiO 2 +Al 2 O 3 ) content of 55 wt pct, the minimum liquidus temperatures for slags with Al 2 O 3 /SiO 2 = 0.5 occur at MgO/CaO ≈ 0.4 (1360 °C), respectively, and the liquidus temperature of the Al 2 O 3 /SiO 2 = 0.4 slag is consistently lower than that of the Al 2 O 3 /SiO 2 = 0.5 slag over the entire MgO/CaO range studied. At fixed MgO/CaO weight ratio of 0.2 and 0.15, the liquidus temperature first decreases and then increases with increasing quaternary basicity (defined as (CaO+MgO)/(SiO 2 +Al 2 O 3 ) by mass). In the conventional basicity range of blast furnace slag (0.95 to 1.05), the liquidus temperature ranges from 1400 °C to 1500 °C, and the high-alumina slag always exhibits a higher liquidus temperature than the ordinary slag. Significant deviations exceeding 50 °C were observed between the experimental liquidus temperatures and the phase equilibria calculated using the FactSage 8.4 thermodynamic database for high‑alumina blast furnace slags. The compositional characteristics of the melilite solid solution were also analyzed using EPMA‑derived compositional data. Strong linear correlations among Al 2 O 3 , SiO 2 , and MgO in melilite confirm the isomorphous substitution mechanism. When the Al 2 O 3 /SiO 2 ratio in the liquid phase is below 0.5, the Al 2 O 3 /SiO 2 ratio in melilite increases sharply with increasing liquid ratio; when the liquid ratio exceeds 0.5, the Al 2 O 3 /SiO 2 ratio in melilite stabilizes within a narrow range of 1.4 to 1.6, indicating that the incorporation of Al 3 ⁺ in the melilite structure approaches an apparent solubility limit.
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
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IF 7.4
Xueqian Wu,Jin Zhao,Jiangyan Tao,Jiawen Chi,Xin Min,Songjian Zhao
As a major greenhouse gas, the rational conversion and utilization of CO 2 can help reduce carbon emissions and mitigate the greenhouse effect. In this study, mesoporous SiO 2 as a carrier, with CuO and NiO employed to construct a binary metal composite silica-based catalyst, coupled with dielectric barrier discharge (DBD) plasma, for the conversion of CO 2 . Physicochemical analysis confirmed the successful introduction of CuO into the mesoporous SiO 2 . NiO and CuO bimetals were dispersed on SiO 2 surfaces with large specific surface areas, ensuring an optimal distribution of metal oxide. Gas chromatography was utilized to investigate the performance of DBD-coupled x%CuO-3 %NiO/Si for CO 2 conversion. The results indicated that the CuO-NiO binary composite silica catalysts significantly improved CO 2 conversion, CO yield, and energy efficiency compared to the monometallic 3 %NiO/Si materials. Further microstructural analysis of the 9 %CuO-3 %NiO/Si catalyst revealed near-elliptic particles with dimensions of 200 by 500 nm and a large number of irregular fine particles attached to the surface. When the CuO loading reached an optimal level and the input power was set at 30 W, the energy efficiency of the 9 %CuO-3 %NiO/Si catalyst increased by 119.6 %. The CuO-NiO binary composite Si-based catalyst developed in this study boasts simple operation and environmental friendliness, making it highly significant for CO 2 treatment.
研究领域:
环境科学
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材料科学
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能源化学
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产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Renjie Ji,Defu Yin,Yao Chen,Like Ma,Fanglin Lv,Yuhao Zhang,Zhen Jia,Jingyun Zhang,Mingya Liu,Shitao Yu,Yue Liu
A core–shell catalyst mZSM-5@SO 4 2- /mSiO 2 composed of mZSM-5 core and SO 4 2- /mSiO 2 shell was prepared by the soft template method. Core-shell structure could promote the building of Brønsted -Lewis (B-L) acids interface and significantly improve the synergistic effect of B-L. In this paper, the Brønsted/Lewis (B/L) of mZSM-5@SO 4 2- /mSiO 2 was targeted regulating by innovatively introducing Brønsted acid (BA) sites into the shell. The optimal mZSM-5@SO 4 2- /mSiO 2 catalyst (B/L = 0.142) could achieve 72.1 % furfural yield at 140 ℃ for 1 h. In addition, 70.2 % furfural yield could be obtained after the catalyst was recycled and regenerated for 5 times. Combining In-situ IR and 13 C NMR, the reaction path was revealed in detail: xylose was first isomerized to xylulose and then dehydrated to furfural. This paper provides a research idea for the directional regulation of dual active sites of cascade reaction catalysts.
研究领域:
催化化学
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生物质转化
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产品关联
DOI
高影响因子
JOURNAL OF POLYMER ENGINEERING
·
2022
·Vol. 42
·期 9
·885-898
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IF 1.624
Yadi Zhang,Chengcong Wang,Lijuan Zhang,Jianghuan Shi,Haikuan Yuan,Jie Lu
Multiwall carbon nanotubes (MWCNTs) are often used to modify polymer membranes as additives, however, MWCNTs are easy to agglomerate and entangle in polymer matrix due to their own strong van der Waals force. MWCNTs were doubly modified by bonding octadecylamine (ODA) and SiO 2 through the respective amidation and esterification reactions to prepare SiO 2 -MWCNT-ODA nanocomposites. The amino groups on ODA were amidated with the carboxyl groups on MWCNT-COOH. Then the hydroxyl groups on SiO 2 were bonded to MWCNT-COOH through esterification to obtain SiO 2 -MWCNT-ODA nanocomposites. PES/SiO 2 -MWCNT-ODA composite ultrafiltration (UF) membrane was prepared by non-solvent induced phase separation (NIPS) method. SiO 2 -MWCNT-ODA nanocomposites and PES/SiO 2 -MWCNT-ODA membrane were characterized by FTIR, XRD, TGA, and SEM, etc. The results showed that PES/SiO 2 -MWCNT-ODA membrane had significantly improved permeability, rejection, and antifouling properties for comparison with PES membrane. The pure water flux of PES/Nano.2-0.5 reached 212.5 L m −2 h −1 , which was approximately 2.6 times than that of PES membrane, and the rejection of BSA protein for composite membrane was as high as 94.2%. PES/SiO 2 -MWCNT-ODA composite membrane had excellent antifouling performance and the flux recovery rate ( FRR ) of PES/Nano.2-0.5 membrane could still maintain at higher value of 84.82% after two cycles in the antifouling test.
研究领域:
材料科学
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环境工程
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膜技术
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DOI
高影响因子
KEY ENGINEERING MATERIALS
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2016
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IF 0
Ben Cang Cui,Jing Li,Hui Ning Wang,Yuan Hua Lin,Yang Shen,Ming Li,Ce Wen Nan
Polymer-infiltrated-feldspar used for restorative composite CAD/CAM blocks were prepared by infiltrating polymerizable monomers into the partially sintered feldspar blocks. The flexural strength was tested according to the standard of ISO-4049. The micro-structure was examined by SEM. The effects of sintering temperature, high pressure and the addition of SiO2 and Al2O3 on the ultimate flexural strength were evaluated. The flexural strength corresponding to infiltration with pressure was much higher than that without pressure at high sintering temperature. The addition of SiO2 and Al2O3 into the natural feldspar mineral increased the flexural strength of the blocks significantly.
研究领域:
材料科学
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牙科医学
✓ 已验证
DOI
POLYMER SCIENCE SERIES B
·
2023
·Vol. 64
·期 6
·897-905
·
IF 1.2
Li Yang,Liu Jun,Mai Chongyang,Lv Chengcheng,Guo Yawen,Zhao Lielun,Jiang Yan,Zhang Hongwen
Abstract In this study, the macroinitiator poly(hexafluorobutyl methacrylate) (PHFBMA) was first prepared by atom transfer radical polymerization (ATRP) method, and then PHFBMA- b -PHEMA block copolymer was prepared by ATRP method using hydroxyethyl methacrylate (HEMA) as the monomer. After that, the amphiphilic diblock copolymer was used to construct a porous membrane using breath figures. Surface hydrophobicity is one of the important properties of materials. It is inspired by the principle of nepenthes predation, that the slippery liquid-infused porous surface (SLIPS) mimics the inner wall structure of the pitcher plant. In order to enhance the surface hydrophobicity of the fluoropolymer coating, the silicone oil infused on the ultra-slip surface is innovatively modified by nano-SiO 2 filling. When the content of polysiloxane is unchanged (10 mL for silicone oil and 0.5 g for polysiloxane), the modified silicone oil filled with 1.5 g of nano-SiO 2 owns the best modification effect at the film concentration of 37.5 mg/mL. The results show that the hydrophobic properties of the SLIPS are greatly improved compared with the porous film. The water contact angle of SLIPS is 160 o , the sliding angle of SLIPS is 7°. In addition, due to the presence of surface silicone oil, the SLIPS has good resistance to bacterial adhesion.
研究领域:
材料科学
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生物医学工程
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DOI
高影响因子
FUEL
·
2020
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IF 5.578
Tong Geng,Jun Xu,Mannian Ren,Xinyuan Li,Fahai Cao
In this work, micron core–shell particles (P4VP@SiO 2 ) are synthesized by chemically grafting poly(4-vinyl pyridine) (P4VP) onto the surface of SiO 2 to explore their adsorption selectivity and capacity over nickel and calcium ions from heavy oil through conventional electric desalination process. FT-IR, TGA, elemental analysis (EA), SEM and TEM are employed to confirm the structure and grafting ratio of P4VP@SiO 2 . Then, the effects of various process conditions on nickel and calcium removal rates are investigated. It is found that, removal rates of nickel and calcium increase with increasing demetalizer concentration. Proper temperature and oil/water ratio favor two metals removal rates. Interestingly, both the experimental results and DFT calculations show that three demetalizers exhibit different adsorption selectivity and capacity for the two metals. The order of adsorption selectivity for nickel is PVP@SiO 2 > PVIm@SiO 2 > P4VP@SiO 2 (strong to weak). Moreover, the absorption capacity follows the sequence: P4VP@SiO 2 > PVP@SiO 2 > PVIm@SiO 2 , and the calcium absorption capacity of P4VP@SiO 2 is much higher than the other two. The removal rates reach 68.2% for nickel and 62.2% for calcium by P4VP@SiO 2 , indicating that it possesses a great potential for removal of both nickel and calcium from heavy oil.
研究领域:
化学工程
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材料科学
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石油加工
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产品关联
DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
·
2015
·Vol. 11
·期 1
·81-87
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IF 0.789
Jianxian Zeng,Zhaohui Qian,Xuejun Zhang,Hu Zhou,Peng Zhang,Lianggang Yi,Jun Tian
A novel modified ceramic membrane (CM-SiO 2 -A) has been prepared with the depositing and grafting technologies for removal of Ni 2+ from aqueous solutions. Firstly, the silica was deposited onto the surface of initial ceramic membrane (CM) by using the in situ hydrolysis deposition method and activated to obtain the silanol groups. Then, 3-[2-(2-aminoethylamino)ethylamino]propyl-trimethoxysilane was grafted onto the silica layer to obtain the CM-SiO 2 -A. The CM-SiO 2 -A was characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, Fourier transform-infrared spectroscopy, and thermogravimetric analysis. Further, the change of water flux and separation of Ni 2+ were studied by using the modified membrane. Results showed that the water flux of CM-SiO 2 -A was decreased by 84.79% compared with the CM. The CM-SiO 2 -A had a much higher total rejection rate of Ni 2+ (77.24%) than that of the un-grafted membrane (1.02%) at initial Ni 2+ concentration of 10 mg/L and exhibits the potential for separation of low concentration of Ni 2+ from aqueous solutions. Copyright © 2015 Curtin University of Technology and John Wiley & Sons, Ltd.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2018
·Vol. 20
·期 1
·10
·
IF 3.687
Gaoqi Ma,Xitao Luo,Xitong Sun,Weiyan Wang,Qinghui Shou,Xiangfeng Liang,Huizhou Liu
The modification of the surface of silica gel to prepare hydrophilic chromatographic fillers has recently become a research interest. Most researchers have grafted natural sugar-containing polymers onto chromatographic surfaces. The disadvantage of this approach is that the packing structure is singular and the application scope is limited. In this paper, we explore the innovative technique of grafting a sugar-containing polymer, 2-gluconamidoethyl methacrylamide (GAEMA), onto the surface of silica gel by atom transfer radical polymerization (ATRP). The SiO2-g-GAEMA with ATRP reaction time was characterized by Fourier infrared analysis, Thermogravimetric analysis (TGA), and elemental analysis. As the reaction time lengthened, the amount of GAEMA grafted on the surface of the silica gel gradually increased. The GAEMA is rich in amide bonds and hydroxyl groups and is a typical hydrophilic chromatography filler. Finally, SiO2-g-GAEMA (reaction time = 24 h) was chosen as the stationary phase of the chromatographic packing and evaluated with four polar compounds (uracil, cytosine, guanosine, and cytidine). Compared with unmodified silica gel, modified silica gel produces sharper peaks and better separation efficiency. This novel packing material may have a potential for application with highly isomerized sugar mixtures.Keywords:glycopolymers;ATRP;SiO2-g-GAEMA;packing materials
研究领域:
色谱学
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材料科学
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聚合物化学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 7
·3653-3660
·
IF 3.049
Guang Xiong,Miaomiao Feng,Jiaxu Liu,Qingrun Meng,Liping Liu,Hongchen Guo
An aerosol-assisted hydrothermal method has been applied to synthesizing hierarchical beta zeolites with SiO2/Al2O3 ratios ranging from 44 to 392 in NaF media. Two different morphologies, including nano-aggregates with interparticle mesopores and plate-like zeolites with intracrystalline mesopores, can be formed depending on the SiO2/Al2O3 ratios of the synthesis gels. A possible mechanism for the formation of the beta zeolites has been proposed. The obtained beta zeolites show hierarchical pores, good Al species distribution and less internal defect sites. Evaluation, by the cracking of 1,3,5-triisopropylbenzene (1,3,5-TIPB), is consistent with the acidic properties and the pore structure of beta zeolites with different ratios of SiO2/Al2O3.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）