JOURNAL OF MATERIALS SCIENCE
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2014
·Vol. 49
·期 16
·5772-5781
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IF 2.305
Shi Junjun,Zhou Yuming,Zhang Yiwei,Zhou Shijian,Zhang Zewu,Kong Jie,Guo Mingpeng
Magnesium (Mg)-modified mesoporous alumina with different type and content of Mg was prepared and then used as the support for platinum-tin catalyst in propane dehydrogenation. It was found that the property of Mg in Al 2 O 3 varied with the way of the addition of Mg precursors. For the grafted Mg species, the connection between Al 2 O 3 and Mg was increased by the forming of Mg–O–Al bonds in the inner surface of Al 2 O 3 pore. While for the traditional impregnation, Mg was attached loosely to the outer Al 2 O 3 surface by the aggregation of MgO. Moreover, modifying the internal framework of Al 2 O 3 by suitable content of Mg can enhance the interaction between Sn and support, leading to more amounts of tin in their oxidized states, which was beneficial to enhance the interaction of Pt with SnO x species. As a result, agglomerations of metallic particles were suppressed and the catalyst exhibited the best catalytic performance in terms of activity and stability.
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
Frontiers in Chemistry
·
2022
·
IF 5.545
Hu Yanru,Zhang Gengrui,Liu Lele,Chi ZiXin,Wang Shuai,Lin Jingdong,Xiong Haifeng,Wan Shaolong
The thermocatalytic conversion of hexose into valuable chemicals such as methyl lactate under mild conditions is very appealing. Here, we report that Mo, Mg co-modified Sn-β catalyst can effectively catalyze the transformation of glucose and fructose into alkyl lactate at moderate temperatures. A maximum yield of around 35% of methyl lactate was achieved from the conversion of glucose in methanol at 100°C over Sn-β catalyst modified with 3 wt% Mo and 0.5 wt% Mg. However, up to 82.8% yield of ethyl lactate was obtained in the case of fructose in ethanol upon the same catalytic condition, suggesting a significant solvent effect. The Mo species plays a key role to enable the retro-aldol condensation of fructose, in which the competing side reactions are significantly suppressed with the assistance of neighboring Mg species probably through a synergetic effect of Lewis acid-base.
研究领域:
催化化学
·
绿色化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Molecular Catalysis
·
2023
·
IF 4.6
Xiaomei Yang,Jie Hu,Tianliang Lu,Lipeng Zhou
Sucrose is an abundant, cheap and sustainable substrate for producing high value-added chemicals. In this work, the role of weak Brønsted (B) acid site of Sn-β zeolite was revealed in sucrose conversion to methyl lactate (MLA). Sn-β zeolites were prepared by post-synthesis and hydrothermal synthesis in F ‒ media and modified by Mg 2+ to tune the B acidity. The acidity of the zeolites was characterized by FT-IR spectroscopy of pyridine/CD 3 CN adsorption and hydroxyl region. Their catalytic performance for sucrose conversion to MLA in methanol indicates that weak B acid sites of silanols are indispensible for breaking the glycosidic bond of sucrose, so the highest MLA yield was obtained over the postsynthesized Mg-Sn-β-P with moderate amount of weak B acid sites of silanols, strong L acid sites and no strong B acid sites, which juggled the alcoholysis/hydrolysis of sucrose and the retro-aldol of C 6 monosaccharide to MLA, and at the same time inhibited the dehydration side-reaction.
研究领域:
化学工程
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Healthcare Materials
·
2022
·Vol. 12
·期 3
·2201349
·
IF 11.092
Xirui Jing,Chao Xu,Weijie Su,Qiuyue Ding,Bing Ye,Yanlin Su,Keda Yu,Lian Zeng,Xu Yang,Yanzhen Qu,Kaifang Chen,Tingfang Sun,Zhiqiang Luo,Xiaodong Guo
Repairing infected bone defects is a challenge in the field of orthopedics because of the limited self-healing capacity of bone tissue and the susceptibility of refractory materials to bacterial activity. Innervation is the initiating factor for bone regeneration and plays a key regulatory role in subsequent vascularization, ossification, and mineralization processes. Infection leads to necrosis of local nerve fibers, impeding the repair of infected bone defects. Herein, a biomaterial that can induce skeletal-associated neural network reconstruction and bone regeneration with high antibacterial activity is proposed for the treatment of infected bone defects. A photosensitive conductive hydrogel is prepared by incorporating magnesium-modified black phosphorus (BP@Mg) into gelatin methacrylate (GelMA). The near-infrared irradiation-based photothermal and photodynamic treatment of black phosphorus endows it with strong antibacterial activity, improving the inflammatory microenvironment and reducing bacteria-induced bone tissue damage. The conductive nanosheets and bioactive ions released from BP@Mg synergistically improve the migration and secretion of Schwann cells, promote neurite outgrowth, and facilitate innerved bone regeneration. In an infected skull defect model, the GelMA-BP@Mg hydrogel shows efficient antibacterial activity and promotes bone and CGRP + nerve fiber regeneration. The phototherapy conductive hydrogel provides a novel strategy based on skeletal-associated innervation for infected bone defect repair.
研究领域:
骨科
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生物材料
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组织工程
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再生医学
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感染控制
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）