2568-33-4Relevant articles and documents
Microwave-assisted acid-induced formation of linker vacancies within Zr-based metal organic frameworks with enhanced heterogeneous catalysis
Liang, Yu,Li, Chenhui,Chen, Lanjun,Huo, Jia,Loubidi, Mohammed,Zhou, Yangyang,Liu, Yanbo
, p. 787 - 790 (2021)
Herein, we report a microwave-assisted acid-induced post-treatment method for the formation of linker vacancies within Zr-based metal organic frameworks (Zr-MOFs). The number of linker vacancies can be easily regulated with this method by changing the concentration of the HCl solution and the duration of microwave irradiation. The optimized defective UiO-66 showed higher linker defects with a higher specific surface area and thermal stability. The results of the catalytic cyclization of citronella showed that the Zr-MOFs with more defects exhibited enhanced catalytic performance. This work may provide a new method for the creation of defective MOFs with high activity and stability.
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Gey et al.
, p. 2354,2365 (1957)
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Conversion of Isobutene and Formaldehyde to Diol using Praseodymium-Doped CeO2 Catalyst
Zhang, Zhixin,Wang, Yehong,Lu, Jianmin,Zhang, Chaofeng,Wang, Min,Li, Mingrun,Liu, Xuebin,Wang, Feng
, p. 8248 - 8254 (2016)
Conversion of low-carbon olefins to higher alcohols or olefins via the formation of C-C bonds is an increasingly important topic. We herein report an example of converting isobutene and formaldehyde (38 wt % aqueous solution) to 3-methyl-1,3-butanediol (MBD), a precursor for isoprene. The reaction occurs through a Prins condensation-hydrolysis reaction over a praseodymium (Pr)-doped CeO2 catalyst. The best MBD yield (70%) is achieved over the Pr-doped CeO2 catalyst. Catalyst characterizations with high-angle annular dark field transmission electron microscopy (HAADF-TEM), pyridine adsorption infrared (IR) and Raman spectroscopy, and density functional theory (DFT) calculations show that the doped Pr is uniformly and highly dispersed in the CeO2 crystalline phase. In addition, the Pr doping creates more oxygen vacancy sites on CeO2 and thus enhances the Lewis acidity of the catalyst, which is responsible for the catalytic performance of the Pr-CeO2 catalyst. (Chemical Equation Presented).
KINETICS AND MECHANISM OF HYDRATION OF 3-METHYL-3-BUTEN-1-OL IN AQUEOUS SOLUTIONS OF SULFURIC ACID
Ryabova, R. S.,Osipova, G. F.,Vinnik, M. I.
, p. 886 - 888 (1988)
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Method for preparing 3 - methyl -1 and 3 - butanediol
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Paragraph 0037; 0039; 0040; 0042; 0043; 0045; 0046; ..., (2021/06/02)
The present invention relates to a preparation method of 3-methyl-1,3-butanediol. The 3-methyl-1,3-butanediol is prepared from isobutylene and a formaldehyde aqueous solution as reaction substrates byPrins condensation and hydrolysis process under the action of a doped ceria catalyst. A specific reaction process is as follows: a certain amount of the isobutylene, the formaldehyde aqueous solutionwith a certain concentration and a certain amount of the doped ceria catalyst are mixed and put into a container for sealing, stirring at temperature not lower than 60DEG C for reacting for 0.5h or more, and separating to obtain the 3-methyl-1,3-butanediol. The preparation method has the advantages that the product and the catalyst are simple to separate, the catalyst can be recycled, the reaction process is simple, controllable and easy to operate, and the yield of the 3-methyl-1,3-butanediol is up to 95%.
The in situ transformation of the co-product formaldehyde in the reversible hydrolysis of 1,3-dixoane to obtain 1,3-propanediol efficiently
Wang, Yehong,Zhang, Jian,Zhang, Zhixin,Hou, Tingting,Zhang, Chaofeng,An, Jinghua,Wang, Feng
supporting information, p. 1455 - 1458 (2018/04/12)
Herein, a strategy is developed for efficient production of l,3-propanediol via the hydrolysis of 1,3-dioxane by the in situ transformation of the co-product formaldehyde (HCHO) in the presence of Eu(OH)3. The reversible hydrolysis reaction is promoted to yield 98% conversion and 99% 1,3-propanediol selectivity. Furthermore, HCHO is converted to formic acid (HCOOH) which could act as an acidic catalyst in the hydrolysis of 1,3-dioxane. The combination of FT-IR and control experiments demonstrates that HCOOH is generated via the hydrolysis of formate species which formed on the surface of Eu(OH)3.