JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2012
·Vol. 112
·期 2
·961-967
·
IF 1.604
Pei H. R.,Yan X.,Liu W. B.,Lan X. Z.
Phase behavior of tetradecane–hexadecane mixtures ( n -C 14 H 30 –C 16 H 34 , C 14 –C 16 ) confined in SBA-15 (pore diameters 3.8, 7.8, and 17.2 nm) has been studied by differential scanning calorimetry. Phase diagram of the confined C 14 –C 16 mixtures is greatly influenced by the pore size, which is simple compared with that for the bulk. Melting points of C 14 and C 16 confined in SBA-15 display a linear relation with pore size. Meanwhile, the C 14 –C 16 mixtures have shown a similar melting behavior as pure C 14 and C 16 . Melting temperatures of three C 14 –C 16 /SBA-15 systems have been fitted as a function of mole fraction x
C16 .
研究领域:
物理化学
·
材料科学
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DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2019
·Vol. 27
·期 1
·95-105
·
IF 1.947
Xu Xiang,Zeng Yanning,Yu Caili,Zhang Faai
A series of mesoporous SBA-15 with various pore diameter (8, 15, 22 and 27 nm) were synthesized and used as “microreactor”. Reversible addition–fragmentation chain transfer (RAFT) polymerization of methyl methacrylate (MMA) was conducted in the channels of SBA-15 using azodiisobutyronitrile (AIBN) as initiator, ethyl xanthate ethyl propionate as chain transfer agent. The obtained PMMA/SBA-15 composites and neat PMMAs from composites were characterized by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, nitrogen adsorption and desorption, Fourier transform infrared spectroscopy, thermogravimetry analysis, differential scanning calorimetry, hydrogen nuclear magnetic resonance. Results showed that compared with PMMA from conventional RAFT polymerization, PMMAs obtained from internal SBA-15 featured with narrower molecule weight distribution (1.34–1.55) and higher thermal stability due to confinement effects. With the increment of pore size of SBA-15, the molecular weight and glass transition temperature (T g ) of PMMA obtained from internal SBA-15 were distinctly improved whereas isotacticity of the PMMA decreased. The properties of the PMMA were managed with controllable RAFT polymerization by regulation the pore size of SBA-15.
研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
Carbon Resources Conversion
·
2018
·
IF 0
Yu Chen,Kejing Wu,Qisong Lin,Yulong Wu,Yin Tang,Mingde Yang
Hydrothermal liquefaction (HTL) is one of the most promising technologies for conversion of microalgae, and catalysts with high hydrothermal stability are required for controllable HTL. In this article, SBA-15 incorporated with transition metals (Ni, Pd, Co and Ru) were synthetized via double-template method for catalytic HTL of microalgae. The results showed that metal incorporated SBA-15 represented high hydrothermal stability at 613 K. The incorporated Ni, Co and Ru was dispersed in SBA-15 enhancing the hydrothermal stability. The catalysts greatly influenced the chemical composition of the obtained bio-oil, which contained a higher percentage of furfural derivatives and a lower content of fatty acids and N-containing compounds, thus bio-oil quality was improved significantly. Higher hydrothermal stability and specific surface areas of Co-SBA-15 contribute to the highest preformation with 78.78% conversion and 24.11 wt% bio-oil yield. Metal incorporated SBA-15 provides a potential application for biomass conversion in high-temperature aqueous phase.
研究领域:
生物能源
·
催化化学
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DOI
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2013
·Vol. 116
·期 1
·469-476
·
IF 1.982
Wang L. P.,Wang T. B.,Gao C. F.,Lan X.,Lan X. Z.
Phase behaviors of dodecane–hexadecane ( n -C 12 H 26 –C 16 H 34 , C 12 –C 16 ) binary mixtures in bulk and confined in SBA-15 (pore diameters 3.8, 9.5, and 17.2 nm) are investigated using differential scanning calorimetry. According to the thermal analysis, the bulk mixtures belong to a system of partial miscibility with two solid solutions and a eutectoid in the range of mole fraction \( x_{{{\text{C}}_{ 1 6} }} \) = 0.1–0.8. Under confinement, phase behavior of C 12 –C 16 mixtures is distinct from the bulk. Inside pores of SBA-15 (3.8 nm), the solid mixtures has only a melting boundary. In the pores larger than 9.5 nm, phase behaviors of the mixtures show some resemblance to the bulk system. The growth of the phase diagram with the pore diameter clearly shows the size effect on the phase behavior of the confined mixtures. In comparison with those of chain length difference of pure components of two carbon atoms or less, C 12 –C 16 mixtures exhibit different phase behaviors not only in the bulk but also in the confined state.
研究领域:
物理化学
·
材料科学
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产品关联
DOI
高影响因子
Canadian Journal of Chemistry
·
2021
·Vol. 99
·期 10
·
IF 1.118
Shan Lining,Wang Haiyue,Guo Liying,Zheng Rongrong,Shi Lili,Zhang Shuo
In this work, we report a more simple and efficient way to synthesize a composite ionic liquid (IL) ([BMIM][Zn2Br5]) by directly coupling the IL with molecular sieves. Two kinds of immobilized catalysts were successfully synthesized: SBA-15-[BMIM][Zn2Br5] and SBA-15-CPTES-[BMIM][Zn2Br5]. The catalysts were used to catalyze the cycloaddition reaction of continuous transformation of CO2 and propylene oxide, and the catalytic performance of catalysts was further studied. Compared with the traditional IL catalysts, the catalysts not only have excellent catalytic performance, but also have a significantly longer service life. This is because the catalysts are formed by a high energy chemical bond of silane between IL catalysts and molecular sieves, which can effectively solve the problem of the loss of IL active components in the catalytic process.
研究领域:
化学工程
·
材料科学
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DOI
高影响因子
JOURNAL OF THE INDIAN CHEMICAL SOCIETY
·
2022
·
IF 0.243
Huang Yuhua,Liu Xiaogang,Shi Minxin,Qin Yuanyuan,Li Xiancai
The lanthanum ion imprinted polymer (La-IIP/SBA-15/Y) was successfully synthesized by the surface ion imprinting method. Using La-IIP/SBA-15/Y as the adsorbent to adsorb lanthanum ions, the overall empirical conditions were optimized, and the best exploratory conditions were finally found. The pH of the solution was 2; the adsorption equilibrium was reached in 60 min and the saturated adsorption capacity was 562.95 mg/g La-IIP/SBA-15/Y adsorbed gadolinium ions in the study of its adsorption process and found that it conforms to the Langmuir isotherm adsorption model, and the adsorption reaction is a spontaneous reaction, and it also conforms to the quasi-second-order kinetic model. The selectivity of the adsorbent was explored experimentally, and the results showed that La-IIP/SBA-15/Y has good selectivity, and experimental elution and regeneration performance. The best elution effect is 2 mol/L hydrochloric acid. La-IIP/SBA-15/Y has good stability and can be reused.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2016
·Vol. 23
·期 3
·823-831
·
IF 1.385
Yuan Junjie,Xiong Jun,Wang Jiahong,Ding Wenjing,Yang Lei,Zhang Ming,Zhu Wenshuai,Li Huaming
A supported catalyst was synthesized on the mesoporous materials with ionic liquid modified by the silicontungstic acid (HSiW-IL/SBA-15). A series of characterization, such as XRD, N 2 adsorption desorption, SEM, TEM and XPS analysis showed that HSiW was successfully immobilized onto the IL modified SBA-15 and maintained the SBA-15 mesoporous structure. Compared with HSiW and HSiW/SBA-15, the catalyst HSiW-IL/SBA-15 had excellent catalytic activity for oxidative desulfurization of fuels. After analysis, the high activity of HSiW-IL/SBA-15 was attributed to the catalyst with large specific surface area, pore size and hydrophobic performance, which had a better wettability for fuel. The catalyst had a good recycling performance, and the sulfur removal still remained 96.4 % after eight times cycle.
研究领域:
化学工程
·
材料科学
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产品关联
DOI
高影响因子
JOURNAL OF BIOSCIENCE AND BIOENGINEERING
·
2016
·
IF 1.964
Xiaoyao Fei,Shaoyun Chen,Dai Liu,Chunjie Huang,Yongchun Zhang
Two functionalized SBA-15 [amine-functionalized SBA-15 (AFS) and epoxy-functionalized SBA-15 (GFS)] with different types of functional groups were synthesized by a hydrothermal process and post functionalized with 3-aminopropyltriethoxysilane (APTES) and 3-glycidyloxypropyltrimethoxysilane (GPTMS), respectively. They were used for the immobilization of carbonic anhydrase (CA). The physicochemical properties of the functionalized SBA-15 were characterized by X-ray powder diffraction (XRD), N 2 adsorption–desorption, 13 C, 29 Si solid-state nuclear magnetic resonance (NMR) spectroscopy, and scanning electron microscopy (SEM). Before and after CA was immobilized on AFS and GFS, the effects of temperature and pH value on the enzyme activity , storage stability, and reusability were investigated using para -nitrophenyl acetate ( p -NPA) assay. CA/GFS showed a better performance with respect to storage stability and reusability than CA/AFS. Moreover, the amount of CaCO 3 precipitated over CA/AFS was less than that precipitated over CA/GFS, which was almost equal to that precipitated over the free CA. The results indicate that the epoxy group is a more suitable functional group for covalent bonding with CA than the amino group, and GFS is a promising support for CA immobilization.
研究领域:
生物化学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
ACTA PHYSICO-CHIMICA SINICA
·
2017
·Vol. 33
·期 7
·1462-1473
·
IF 0.767
HUANG Xue-Hui,SHANG Xiao-Hui,NIU Peng-Ju
Mesoporous SBA-15 with mesopore diameter up to 10.1 nm was prepared by a hydrothermal method, and was further functionalized to obtain different surface properties. Thus-prepared SBA-15 was employed as a template to synthesize rhombohedrally crystallized mesoporous La0.8Sr0.2CoO3
perovskite via a nanocasting method. The surface properties of the SBA-15 were adjusted by treatment with concentrated hydrochloric acid, trimethylchlorosilane (TMCS), and 3-aminopropyltriethoxysilane (APTES). A series of characterization techniques verified that all the synthesized
templates possessed ordered two-dimensional hexagonal mesoporous structure, and the surface was successfully modified with methyl and amino groups. The mesoporous perovskite structure was formed in the samples and the surface properties of SBA-15 significantly influenced the structure and
properties of La0.8Sr0.2CoO3 perovskite oxides. Wide-angle X-ray diffraction patterns suggested that the modified silica templates were conducive to the formation of pure perovskite frameworks with good crystallinity. The catalysts also possessed mesoporous
structure, as confirmed by small-angle XRD patterns, high-resolution transmission electron microscopy images, and nitrogen adsorption analysis. Moreover, the La0.8Sr0.2CoO3 materials synthesized using surface-functionalized templates exhibited relatively higher
catalytic activity and stability in CO oxidation. Complete CO conversion could be achieved at 140°C #xb0;Cusing the thus-prepared La0.8Sr0.2CoO3 materials, and no significant loss in catalytic activity was observed after 100 h of on-stream reaction experiments.
X-ray photoelectron spectroscopy, H2 temperature-programmed reduction, and O2 temperature-programmed desorption experiments revealed that the existence of Co4+, Sr enrichment in the perovskite structure, and high content of adsorbed oxygen species play a critical
role in the enhanced catalytic activity of the catalysts. We also proposed the possible reasons for the effect of surface properties of the silica templates on the structure and properties of the La0.8Sr0.2CoO3 nanomaterials.
研究领域:
材料科学
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催化化学
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DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2022
·
IF 3.898
Haocui Zhang,Zhourong Xiao,Mei Yang,Jijun Zou,Guozhu Liu,Xiangwen Zhang
Ni/SBA-15 modified by highly dispersed cerium-oxide was prepared with the aid of sucrose for steam reforming of JP10 (C 10 H 16 ). Their characterization showed that addition of appropriate amount ceria led to the formation of highly dispersed CeO 2 and Ni, and the CeO 2 covered smaller nickel particles like strawberry seeds to form much more interface between them. Their catalytic activity exhibited higher stability over time on stream of 6.5 h with conversion higher than 95% and higher carbon resistance (mass loss less than 4.5% by TG), which may derive from good properties below: (1) much more interface enhanced cooperation effect and increased turnover frequency at the interface; (2) the stronger interaction between Ni and ceria to suppress sintering by formation of Ni-O-Ce solid solution; (3) the large amount of oxygen vacancies from the formation of Ni-O-Ce solid solution and highly dispersed CeO 2 to facilitate the water–gas–shift reaction and carbon removal.
研究领域:
化学工程
·
催化材料
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Fenglei Liu,Anjie Wang,Miao Xiang,Qingyuan Hu,Baowei Hu
Herein, a magnetic amine-functionalized mesoporous silica SBA-15 (Fe 3 O 4 @SBA-15-PDA/HBP-NH 2 ) adsorbent was fabricated by loading Fe 3 O 4 nano-particles on amino-terminated hyperbranched polymers (HBP-NH 2 ) functionalized SBA-15 and exploited for chromium (VI) and uranium (VI) elimination. The morphologies and microstructures of as-obtained materials were observed using different physicochemical and spectroscopic techniques. Meanwhile, batch experiments were performed to investigate the impacts of various water environment conditions on removal process including solution pH, equilibrium time and temperatures. The maximum adsorption capacities of U(VI) and Cr(VI) on Fe 3 O 4 @SBA-15-PDA/HBP-NH 2 reached up to 77.4 mg/g and 66.5 mg/g under optimal water environment conditions. Moreover, the characterization analysis manifested that removal of U(VI) was fulfilled through the surface complexation with amino and phenolic hydroxyl groups, while Cr(VI) were firstly electrostatically adsorbed, and subsequently reduced to less toxic Cr(III) by phenolic hydroxyl groups. These findings demonstrated that this new magnetic amine-functionalized SBA-15 could be considered as valuable materials in environmental cleanup.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
CHEMPHYSCHEM
·
2025
·
IF 2.2
Hao Yu,Mukendi Archip Tshimanga,Tshimanga Landry Wa Tshimanga,Meng Gao
Graphical Co−B/SBA-15 catalysts are prepared through an impregnation chemical reduction process. The hydrogen hydrolysis performance is meticulously investigated using the water displacement method. Through detailed experimental procedures and comprehensive analysis, the findings highlight the significant potential of Co−B/SBA-15 catalysts in hydrogen production applications, emphasizing the importance of catalyst structure and preparation methods on their performance metrics. Hydrolysis of NaBH 4 has garnered great concern in the production of hydrogen. Four different cobalt loadings (5 wt.%, 10 wt.%, 12.5 wt.% and 15 wt.%) were impregnated on SBA-15 molecular sieve. The effect of Co loading on the catalytic performance of the CoB/SBA-15 catalysts for NaBH 4 hydrolysis using the drainage method was studied. Characterizations using XRD, SEM, XPS, and N 2 adsorption-desorption were analytically conducted to examine the physiochemical properties of the CoB/SBA-15 catalyst. The catalytic activity test revealed that the optimum Co loading was 10 wt.% at which the maximum rate of hydrogen production was 153.0 mL/min⋅gcat, higher than the other samples. In addition, the effect of Co loaded, catalyst amount, and temperature were examined. Furthermore, the stability of the catalyst was maintained after five cycles. Cobalt-based catalysts are a promising catalytic system for hydrogen generation by hydrolysis of NaBH 4 .
研究领域:
材料科学
·
化学工程
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产品关联
DOI
PubMed
高影响因子
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