Journal of the Iranian Chemical Society
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2020
·Vol. 17
·期 9
·2335-2343
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IF 1.552
Wang Liping,He Jiao,Chen Xueying,Lv Yanling
A lanthanide metal–organic framework (MOF) Yb(BTC)(H 2 O)·(DMF) (BTC = 1,3,5-benzenetricarboxylate, DMF = N , N -dimethylformamide) was prepared from Yb(NO 3 ) 3 ·5H 2 O and H 3 BTC using the solvothermal method and characterized by Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, N 2 adsorption–desorption technology, and temperature-programmed desorption. The results show that Yb(BTC)(H 2 O)·(DMF) is a lanthanide MOF with an excellent thermal stability. The coordinated water molecules and DMF guest molecules were removed from the channels by calcination to form a porous solid Yb (BTC) with coordinatively unsaturated Yb 3+ sites. The BET surface area and pore size of Yb(BTC) are 695 m 2 /g and 0.68 nm, respectively. As a heterogeneous Lewis acid catalyst, the activity of Yb(BTC) for the synthesis of polycarbonate diol (PCDL) via transesterification between diphenyl carbonate and diol was investigated. Compared with nine reported catalysts, Yb(BTC) exhibits the highest catalytic activity for the synthesis of PCDL.
研究领域:
材料科学
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催化化学
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2020
·Vol. 10
·期 8
·2443-2451
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IF 5.721
Cong Mao,Jingwei Zheng,Babasaheb M. Matsagar,Ranjith Kumar Kankala,Tansir Ahamad,Yucheng Yang,Kevin C.-W. Wu,Xueqin Zhang
Ruthenium nanoparticles supported onto aluminum-doped mesoporous silica catalysts (Ru/Al–SBA-15) are fabricated using hydrothermal and impregnation methods for catalysis application. The Ru/Al–SBA-15-3 catalyst at a Si/Al molar ratio of 3 exhibited excellent catalytic performance for the hydrogenation of p-phthalic acid with high conversion efficiency (100.0%) and cis-isomer selectivity (84.0%) in water. Moreover, this system displays exceptional stability and recyclability through preserving the conversion efficiency, as well as a cis-isomer selectivity of 90.2 and 83.3%, respectively, after reusing it fourteen times. Such an exceptional system can also be ideal for the hydrogenation of aromatic dicarboxylic acids and their ester derivatives in water. Strong Lewis acid sites due to doped Al species play significant roles in the hydrogenation reaction. Moreover, isotope labeling studies indicated that water molecules effectively participated in the hydrogenation reaction. Hydrogen and water contributed half of the hydrogen atoms for this hydrogenation reaction. In the end, a plausible mechanistic pathway for the hydrogenation of p-phthalic acid using the Ru/Al–SBA-15-3 catalyst in water is proposed.
研究领域:
催化化学
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材料科学
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有机化学
✓ 已验证
DOI
高影响因子
CELLULOSE
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2020
·Vol. 27
·期 12
·6897-6908
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IF 4.21
Guo Weihao,Zuo Minghui,Zhao Jian,Li Chao,Xu Qiaoliang,Xu Chunzhao,Wu Hongfeng,Sun Zhizhong,Chu Wenyi
A series of Brønsted–Lewis acidic di-cationic ionic liquids ( BLAILs ) were synthesized and the catalytic properties of glucose conversion to 5-hydroxymethylfurfural (5-HMF) were investigated. The experimental results showed that the ionic liquid with aluminum trichloride as Lewis acid anion ( BLAIL - 5 ) exhibited good catalytic performance. Under the best reaction conditions, the yield of the glucose conversion into 5-HMF and 5-EMF were 71% and 66%, respectively. In addition, the yield of cellulose to 5-HMF is 41%. The optimized catalytic system could be reused for 5 times without significant catalytic performance loss. In addition, the mechanism of BLAIL - 5 promoting glucose conversion to 5-HMF was studied by density functional theory calculation (DFT).
研究领域:
化学工程
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催化化学
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生物质转化
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Lei Chen,Zhichun Si,Xiaodong Wu,Duan Weng
A CuO–CeO2–TiO2 catalyst for selective catalytic reduction of NOx with NH3 (NH3-SCR) at low temperatures was prepared by a sol–gel method and characterized by X-ray diffraction, Brunner–Emmett–Teller surface area, ultraviolet–visible spectroscopy, H2 temperature-programmed reduction, scanning electron microscopy and in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS). The CuO–CeO2–TiO2 ternary oxide catalyst shows excellent NH3-SCR activity in a low-temperature range of 150–250 °C. Lewis acid sites generated from Cu2+ are the main active sites for ammonia activation at low temperature, which is crucial for low temperature NH3-SCR activity. The introduction of ceria results in increased reducibility of CuO species and strong interactions between CuO particles with the matrix. The interactions between copper, cerium and titanium oxides lead to high dispersion of metal oxides with increased active oxygen and enhanced catalyst acidity. Homogeneously mixed metal oxides facilitate the “fast SCR” reaction among Cu2+–NO, nitrate (coordinated on cerium sites) and ammonia (on titanium sites) on the CuO–CeO2–TiO2 catalyst at low temperatures.
研究领域:
环境催化
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材料化学
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表面科学
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化学工程
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大气污染控制
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）