Immobilized oxo-vanadium Schiff base on graphene oxide as an efficient and recyclable catalyst for the epoxidation of fatty acids and esters
作者:Sanny Verma、Mounika Aila、Savita Kaul、Suman L. Jain
DOI:10.1039/c4ra03454f
日期:——
Oxo-vanadium Schiff base was covalently immobilized onto chemically functionalized graphene oxide (GO) using 3-aminopropyltriethoxysilane as a coupler. The loading of vanadyl Schiff base onto GO nanosheets was confirmed by FTIR, XRD, TGA, and inductively coupled plasma-atomic emission spectroscopy (ICP-AES). The synthesized heterogeneous catalyst was found to be efficient and selective for the epoxidation of fatty acids and esters using t-butyl hydroperoxide (TBHP) as an oxidant. Interestingly, the immobilized catalyst showed a higher catalytic efficiency than the homogeneous vanadyl acetylacetonate. The recycling experiment results indicated that the catalyst was highly stable and maintained very high activity, and selectivity even after being used for six cycles.
以 3-aminopropyltriethoxysilane 为耦合剂,将氧化钒席夫碱共价固定在化学功能化的氧化石墨烯(GO)上。傅立叶变换红外光谱(FTIR)、X射线衍射(XRD)、热重分析(TGA)和电感耦合等离子体原子发射光谱(ICP-AES)证实了钒席夫碱在 GO 纳米片上的负载。研究发现,合成的异相催化剂在以叔丁基过氧化氢(TBHP)为氧化剂进行脂肪酸和酯的环氧化反应时具有高效性和选择性。有趣的是,与均相乙酰丙酮酸香草酯相比,固定化催化剂显示出更高的催化效率。循环实验结果表明,该催化剂具有很高的稳定性,即使在使用六个循环后仍能保持很高的活性和选择性。
METHOD AND DEVICE TO TRAP ACARIDS
申请人:Domobios
公开号:EP3253203B1
公开(公告)日:2020-10-28
[EN] METHOD AND DEVICE TO TRAP ACARIDS<br/>[FR] PROCÉDÉ ET DISPOSITIF DE PIÉGEAGE DES ACARIENS
申请人:DOMOBIOS
公开号:WO2016124566A1
公开(公告)日:2016-08-11
The present invention relates to compositions and methods for eliminating acarids, such as dust mites. The methods comprise contacting a sheet impregnated with an acarid attracting composition with an object containing acarids. Acarids enter the sheet, which can then be removed to eliminate the acarids. The invention further relates to acarid attracting compositions and products and kits for attracting, trapping and eliminating acarids.
Industrial resin “INDION 130” modified with vanadyl cations as highly efficient heterogeneous catalyst for epoxidation of fatty compounds with TBHP as oxidant
作者:Praveen K. Khatri、Mounika Aila、Jyoti Porwal、Savita Kaul、Suman L. Jain
DOI:10.1039/c5nj00744e
日期:——
Industrial grade cation-exchange resin “INDION 130” was modified with vanadyl cations by an ion-exchange method and then used for the epoxidation of unsaturated fatty materials including acids, esters and vegetable oils using tert-butyl hydroperoxide (TBHP) in decane as oxidant. The effect of oxidant/double bond ratio, catalyst concentration, recycling of the catalyst and temperature on the conversion