Accurate Layer Spacing Matching of Polyoxometalate (POM) Anion‐based Ionic Liquids (ILs) to Promote PET Alcoholysis
摘要:
摘要 在纳米尺度上匹配催化剂的活性位点与 PET 的羰基反应位点,并通过精确调节催化剂层间距在分子水平上实现 PET 反应位点的精确剪切是一项特别具有挑战性的工作。本文提出了一种新的绿色催化剂设计策略,合成了一类新型的聚氧化金属(POM)阴离子基 IL(POM-ILs)[X]n[WZn3(H2O)2(ZnW9O34)2](X=PyPs、Py、MIMPs、TEAPs,n=3、6、9、12),具有较高的热稳定性和可调节的层间距(1.00-1.63 nm)。通过调整有机阳离子的比例,使催化剂活性位点间距(1.34 nm)与 PET 苯环两侧羰基官能团间距(1.32 nm)相匹配,在阴阳离子的协同催化作用下,长 PET 链在短时间内被精确剪切并快速降解为对苯二甲酸二羟乙基酯(BHET)。在最佳条件下,催化剂用量仅为 PET 质量的 0.8%,30 分钟内即可降解 100%,BHET 收率高达 85.35%,循环 5 次后 BHET 收率仍大于 85%。此外,通过密度泛函理论计算,提出了协同催化 PET 醇解的可能机理。此外,通过精确调节催化活性位点的间距来促进 PET 醇解的策略尚未见报道。
Method of Fabricating Glycol Monoalkyl Ether Acetate Using Acidic Ionic Liquid Catalyst
申请人:Wu Jung-Chung
公开号:US20110184207A1
公开(公告)日:2011-07-28
A new method for fabricating glycol monoalkyl ether acetate (GMAEA) is provided. A Bronsted acidic ionic liquid is used. After some reactions, two layers of materials are formed. A product of GMAEA is obtained at the upper layer. The lower layer is the ionic liquid. Thus, the ionic liquid is reusable for re-fabricating the product. And, furthermore, waste acid is reduced.
Heteropolyanion-based ionic liquids catalysed conversion of cellulose into formic acid without any additives
作者:Jilei Xu、Hongye Zhang、Yanfei Zhao、Zhenzhen Yang、Bo Yu、Huanjun Xu、Zhimin Liu
DOI:10.1039/c4gc01252f
日期:——
Heteropolyanion-based ionic liquids with –SO3H functionalized cations and PMo11VO404− anions were synthesized and applied in the conversion of cellulose into formic acid (FA). It was demonstrated that the as-prepared ILs showed enhanced activity for catalysing cellulose conversion to FA in the presence of oxygen in water compared to H4PMo11VO40. A high FA yield over 50% accompanied by a FA concentration of ∼10% in reaction solution was obtained at 180 °C and in an oxygen pressure of 1.0 MPa. The possible pathway of FA production from cellulose was investigated. It was indicated that the resulting ILs served as bifunctional catalysts with cations catalysing the cellulose hydrolysis to glucose and anions catalysing glucose oxidation to FA. These ILs may find more applications in cellulose conversion.
METHOD OF SYNTHESIZING TRIOXYMETHYLENE FROM FORMALDEHYDE BY THE CATALYTIC ACTION OF AN IONIC LIQUID
申请人:Xia Chungu
公开号:US20070135649A1
公开(公告)日:2007-06-14
The present invention relates to a method of synthesizing trioxymethylene from formaldehyde by the catalytic action of an acidic ionic liquid. In the method, formaldehyde solution with a concentration of 30˜80 wt % is used as reactant, and an ionic liquid is used as catalyst. The cation moiety of the catalyst is selected from either imidazoles cation or pyridines cation, and the anion moiety of the catalyst is selected from one of p-tolyl benzene sulfonate, trifluoromethyl sulfonate, and hydrogen sulfate. In the present invention, ionic liquid is used, for the first time, as a catalyst to synthesize trioxymethylene from formaldehyde. The catalyst can be circularly used for continuous sampling.
SALTS COMPRISING A PYRIMIDINECARBOXYLIC ACID DERIVATIVE FOR COSMETIC USE
申请人:Rayner-Branes Michael Howard
公开号:US20110152292A1
公开(公告)日:2011-06-23
The invention relates to novel compounds which comprise, as cationic or as anionic component, a pyrimidinecarboxylic acid derivative, in particular a derivative of ectoin or hydroxyectoin, to a process for the preparation thereof, and to the use thereof as ionic liquid or to the use thereof in pharmaceutical, cosmetic and dermatological formulations.