JOURNAL OF POROUS MATERIALS
·
2018
·Vol. 25
·期 5
·1531-1539
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IF 1.858
Wang Shiwei,Chen Keyu,Wang Qibao
The catalytic performance of Yb(OTf) 2 –SO 3 –SBA-15 in the transformation of cellulose into lactic acid was investigated in this paper. The sol–gel technique and the chemical grafting approach were introduced to obtain the SBA-15 and Yb(OTf) 2 –SO 3 –SBA-15, respectively. Yb(OTf) 2 –SO 3 –SBA-15 catalysts were characterized by elemental analysis, ICP-OES, XRD, N 2 adsorption, FTIR, TGA, 29 Si-MAS NMR, SEM and TEM. It is found that the Yb(OTf) 2 –SO 3 –SBA-15 catalyst can catalyze the transformation of cellulose into lactic acid effectively. When the temperature is 220 °C and the reaction time is 60 min, the maximum yield of lactic acid can reach 74.06%. Yb(OTf) 2 –SO 3 –SBA-15 catalyst can be recycled for more than five times without noticeable loss in activity.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yuchen Li,Qi Wang,Xuetong Zhao,Binlang He,Yongjian Xiao,Jing Guo,Lijun Yang,Ruijin Liao
Sodium β- alumina (SBA) electrolytes are among the most excellent candidates for all-solid-state batteries due to their high electrochemical performances and low cost of sodium resources. However, thermally sintering at above 1400 °C is required to fabricate high dense SBA electrolytes, thus giving rise to a huge energy consumption. Here, dense SBA electrolytes and (1- x )SBA- x NaPF 6 ( x = 5, 10, 15, 20 wt%) composites were fabricated using cold sintering process (CSP) below 300 °C with 2 mol/L NaOH solution as transient chemistry. The ionic conductivity of SBA electrolytes is significantly enhanced from 5.53×10 -6 S cm -1 to 5.91 × 10 −4 S cm −1 as 15 wt% NaPF 6 was introduced to the composite, which is comparable with the SBA sintered above 1400 °C. CSP may provide a promising approach for the fabrication of solid-state electrolytes by avoiding the detrimental impact of high temperature heat treatment.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Reaction Chemistry & Engineering
·
2020
·Vol. 5
·期 9
·1833-1844
·
IF 3.441
Guochao Yang,Lingtao Wang,Haoxi Jiang
Upgrading bio-ethanol into high value chemicals is an important issue in biomass conversion, and conversion of ethanol into butadiene is one of the most feasible methods. Here Zr-incorporating mesoporous SBA-15 (Zr–SBA-15) materials with different Si/Zr ratios were successfully synthesized by a one-pot method and were employed as catalysts for the conversion of the ethanol (EtOH)–acetaldehyde (AcH) mixture to butadiene. The textural structure and acidity of Zr–SBA-15 were investigated by using XRD, N2 adsorption, TEM, FT-IR, UV-vis, XPS, NH3-TPD and Py-IR, and the results of these characterizations indicated the mesoporosity of Zr–SBA-15 and confirmed the incorporation of Zr into the framework. Zr–O–Si bonds were formed by the incorporation and exhibited Lewis acidity predominantly. The influence of the Si/Zr ratio and reaction conditions (temperature, EtOH/AcH ratio and WHSV) showed that a suitable Si/Zr ratio was needed to balance the butadiene selectivity, by-product selectivity and total conversion. Amongst the prepared catalysts, Zr–SBA-15-20 achieved the best butadiene selectivity of 74.0% at a relatively low temperature (275 °C). The good catalytic performance could be attributed to the homogeneous dispersion of Zr species and Zr–O–Si bond generated by Zr incorporation. Furthermore, EtOH-TPD and AcH-TPD experiments proved the essential role of acetaldehyde addition and the well-accepted reaction pathway.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Fazle Subhan,Sobia Aslam,Zifeng Yan,Ayaz Ahmad,U.J. Etim,Muhammad Naeem,Liu Zhen,Muhammad Ikram,Muhammad Yaseen
Lanthanum based adsorbents are promising in adsorptive desulfurization due to high activity. The dispersion degree of La 2 O 3 impacts desulfurization performance directly, and the development of an efficient strategy for La 2 O 3 dispersion still remained challenge. Herein, for the first time confined spaces and silanols of as-synthesized SBA-15 were used for dispersion of La 2 O 3 over mesoporous silica. The La(NO 3 ) 3 precursor is directly introduced into the confined spaces between silica walls and template of as-synthesized SAB-15 by solid state dispersion (SSD) strategy. The SSD strategy assists the formation of small sized La 2 O 3 with excellent dispersion after La precursor decomposition by the combined action of confined spaces and silanols. We also demonstrated that up to 20 wt% La 2 O 3 can be highly dispersed over as-synthesized SBA-15 (LaAS-20). Our investigations show that well-dispersion of La 2 O 3 correspond to high desulfurization activity for fuels, and the amount of thiophene captured can reach 0.12 mmol of S/g over LaAS-20, which is better than that over LaCS-20 and other La-doped reported sorbents. Furthermore, LaAS-20 adsorbent showed good stability and regeneration ability, and has potential applications to be applied in adsorptive desulfurization technology.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 5
·3033-3038
·
IF 3.9
Yi-Jie Wang,Yu-Fen Bao,Xiao-Jie Lu,Jia-Qi Dong,Ding-Hua Liu
An SBA-15 loaded CuSO4 catalyst was designed and prepared for the highly selective production of 2,6-di-tert-butyl-p-cresol (BHT) from p-cresol and isobutylene. The acidity of solid acid catalysts was altered by varying the loading amount of CuSO4. Among them, 10% CuSO4/SBA-15 exhibited the greatest catalytic performance in the alkylation reaction with a BHT yield of 85.5%. After four cycles, the yield of BHT exceeded 70%. Overall, the catalyst has excellent catalytic performance and can be utilized as a catalyst for efficient BHT production.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Molecular Catalysis
·
2021
·
IF 5.062
Yue Zhang,Zhiyong Pan,Nan Wang,Li Wang
Silica SBA-15 without removal of template P123 was calcined in an inert atmosphere and the carbon-modified SBA-15 thus obtained was used as the support of Pd catalyst for the hydrogenation of 2-ethylanthraquinone (EAQ). The effects of extraction times of P123 in SBA-15 with water prior to inert calcination and calcination temperature on the structure and catalytic performance of Pd catalyst were studied. The results of elemental analysis, X-ray diffraction, X-ray photoelectron spectroscopy, inductively coupled plasma, Fourier transform infrared spectroscopy, Raman spectra, water contact angle measurement, N 2 adsorption-desorption, transmission electron microscopy and energy dispersive X-ray mapping showed that carbon content of catalysts varied in the range of 3.4 % and 1.1 % with increasing extraction times from 0 to 6 due to the decrease in the residual amount of P123 in uncalcined SBA-15. With rising calcination temperature, the occurrence state of carbon in catalysts was converted from amorphism into graphite. The Pd catalyst supported on SBA-15 extracted for 3 times and calcined at 650 °C had 2.0 % carbon, and exhibited the highest activity (0.37 molH 2 ·gPd −1 ·min −1 ) and selectivity (98.9 %). This is due to the presence of appropriate amount of carbon, which provided a relatively high hydrophobicity without significantly reducing the specific surface area and pore size of SBA-15 support. The high hydrophobicity benefits the adsorption of EAQ from the working solution to the surface of catalyst.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING
·
2023
·
IF 1.2
He Yuntao,Guo Xiaxin,Qiao Luyang,Ye Runping,Zong Shanshan,Cao Xinyi,Cheng Jiankai,Zhou Zhangfeng,Yao Yuangen
Rh complexes are considered as the most promising catalysts for formaldehyde hydroformylation since they can achieve higher yields of glycolaldehyde under mild conditions. Although heterogeneous catalysts are convenient to separate, Rh-based heterogeneous catalysts usually have limited catalytic activity in hydroformylation of formaldehyde. Here, four different supports (Al 2 O 3 , SiO 2 , SBA-15 and HMS), loaded with Rh by impregnation method, have been developed for formaldehyde hydroformylation. The physico-chemical properties of the materials have been investigated by means of complementary techniques. Due to the presence of more oxidized rhodium species and stronger metal support interactions, the silica-based catalysts achieved higher formaldehyde conversion and glycolaldehyde selectivity than Rh/Al 2 O 3 . Moreover, SBA-15 and HMS zeolites were synthesized by adjusting the structure of the silica support. Thus, the selectivity of 94.8% for glycolaldehyde and a remarkable glycolaldehyde yield of 52.7% over Rh/SBA-15 catalyst was obtained due to its larger surface area, suitable pore structures and higher dispersion of Rh species.
研究领域:
化学工程
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催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2018
·Vol. 33
·期 10
·1442-1448
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IF 1.495
Lei Liu,Xinyu Fu,Hongliang Zhang,Weiqing Ma,Lili Zhang,Yixin Zhang,Meng Liu,Kehan Liang,Senlin Hou,Aibing Chen
A novel luminogen-functionalized SBA-15, denoted as SNT, was developed by incorporating tris(4-bromophenyl)amine (TBPA) into SBA-15 via a “fixation-induced emission” strategy. The emission of TBPA on the matrix of SBA-15 was greatly enhanced, making the SNT possible as a fluorescence sensor. Cefalexin, a typical antibiotic, was chosen as the model analyte to be assayed and sensitive detection performance was achieved. This is the first time for cefalexin to be detected by a fluorescent method. Moreover, the SNT can be recycled by simply washing with proper solvents then used for next detection. This work provides a strategy to greatly improve the emission characteristics of fluorophores, even if a mediocre small fluorophore. It can be extended to design practical fluorescent sensors with high performance and recyclability by this strategy.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2025
·
IF 7.2
Zhonghao Zhang,Xinsheng Li,Sirun Qin,Xiwen Liao,Xiangxi Huang,Duoqiang Liang
A novel method for selective adsorption of zirconium (Zr) from scandium (Sc) in HNO 3 solution was proposed by DPO/SBA-15-N adsorbent which was prepared with SBA-15 and diphosphoryl (DPO) groups through silane coupling method. The results of scanning electron microscopy-energy dispersive spectrometer (SEM-EDS), Brunauer-Emmet-Teller (BET), thermogravimetry (TG) analysis and digestion analysis indicate that DPO/SBA-15-N is an ordered mesoporous adsorbent with a large specific surface area (157.363 m 2 /g) and high functional group content (1.16 mmol/g). In adsorption experiments, DPO/SBA-15-N exhibits high adsorption capacity ( Q = 130.23 mg/g), high separation factor (SF Zr/Sc = 6402) and high adsorption speed (reaching equilibrium within 10 min) for Zr(Ⅳ) in 6 mol/L HNO 3 medium, and the adsorption is better consistent with pseudo-second-order model and Langmuir model. According to the analysis of Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) results, the P‒O and P=O groups in diphosphoryl (DPO) groups play an important role in the selective adsorption process. In conclusion, the adsorbent prepared in this work has great potential for the selective adsorption of Zr(Ⅳ) from Sc(Ⅲ).
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2020
·Vol. 13
·期 3
·507
·
IF 3.057
Hui Wang,Meiyin Wang,Jining Shang,Yuanhang Ren,Bin Yue,Heyong He
In this work various amount of phosphomolybdic acid (PMo) were immobilized on amine functionalized SBA-15 and used as heterogeneous catalysts in the epimerization of glucose in aqueous solution. 13.3PMo/NH2-SBA-15 exhibited the best catalytic performance with a glucose conversion of 34.8% and mannose selectivity of 85.6% within two hours at 120 °C. The activation energy of 80.1 ± 0.1 kJ·mol−1was lower than that of 96 kJ·mol−1over the homogeneous H3PMo12O40catalyst. The catalytic activities of 13.3PMo/NH2-SBA-15 for the transformation of some other aldoses including mannose, arabinose and xylose were also investigated.Keywords:aldose epimerization;phosphomolybdic acid;amino-silanization;SBA-15
研究领域:
催化化学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
·
2013
·
IF 3.187
Yueling Cao,Junwei Wang,Maoqing Kang,Yulei Zhu
Ni–WO 3 /SBA-15 catalysts were prepared by an impregnation way and applied to the hydrogenolysis of cellulose in aqueous solution. The effect of nickel and WO 3 loading, catalysts reduction temperature and time on cellulose conversion were investigated. Up to 70.7% ethylene glycol yield was obtained over 3%Ni–15%WO 3 /SBA-15 catalysts. Several physicochemical methods such as XRD, Raman spectroscopy, NH 3 -TPD, H 2 -TPR and XPS were used to determine the character of catalysts. Based on these studies, it was found that there was a strong electronic interaction between NiO and WO 3 , which not only promoted the reduction of WO 3 , but restrained the reduction of NiO. Together with the experimental results, it can be concluded that the WO 3− X , which may be the active species for the selective cleavage of C C bond, was formed after catalysts pretreatment process. Additionally, a possible catalytic mechanism was proposed.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2019
·Vol. 14
·期 4
·661-672
·
IF 2.809
Zhang Ye,Song Jian,Mayta Josue Quispe,Pan Fusheng,Gao Xue,Li Mei,Song Yimeng,Wang Meidi,Cao Xingzhong,Jiang Zhongyi
The utilization of materials with a hierarchical porous structure as multi-functional additives is highly attractive in the preparation of hybrid membranes. In this study, novel hybrid membranes are designed by embedding hierarchical porous Santa Barbara Amorphous 15 (SBA-15) with a dual-pore architecture (micropores and mesopores) for pervaporation desulfurization. The SBA-15 with cylindrical mesopores provides molecular transport expressways to ensure improved permeability, while micropores on the wall have molecular sieving effects that are essential for the enhancement of permselectivity of thiophene molecules. Considering thiophene/ n -octane mixture as a model system, the hybrid membrane with embedded 6 wt-% SBA-15 exhibits optimal pervaporation desulfurization performance with a permeation flux of 22.07 kg·m −2 ·h −1 and an enrichment factor of 6.76. Moreover, the detailed structure and properties of hybrid membranes are systematically characterized. This study demonstrates the immense potential of hierarchical porous materials as additives in membranes to simultaneously increase permeability and permselectivity.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）