期刊
CATALYSIS TODAY
卷 357, 期 -, 页码 56-63出版社
ELSEVIER
DOI: 10.1016/j.cattod.2019.04.044
关键词
Copper catalyst; Hydrochar; Scorpionate; Recyclable; Styrene oxidation
资金
- Foundation for Science and Technology (FCT), Portugal [UID/QUI/00100/2013, PTDC/QEQ-ERQ/1648/2014, UID/MULTI/00612/2013, PD/BD/105993/2014]
- Fundação para a Ciência e a Tecnologia [PD/BD/105993/2014] Funding Source: FCT
Mononuclear C-scorpionate copper(II) complexes [CuCl2{kappa(3)-RC(R1-pz)(3)}[R = R1 = H (1), R = CH2OH, R-1 = H (2) and the new R = H, R-1 = 3,5-Me-2 (3)] supported on sucrose derived hydrochars are the first recyclable tris (pyrazol-1-yl)methane catalysts used so far for the selective oxidation of styrene to benzaldehyde. Remarkably, a benzaldehyde yield of over 60% (100% selectivity) with a TOF = 1.3 x 10(4) was obtained after only 5 min reaction in homogeneous conditions. The immobilization of 1-3 at functionalized hydrochars led to solvent-free recyclable catalytic systems for the mentioned reaction, that, although leading to slightly modest benzaldehyde yields (up to 52%), require much lower amounts of oxidant than the homogeneous analogs. The effects of scorpionate properties as well as of reaction parameters (e.g., reaction time, amount of catalyst and oxidant or type of solvent) on the performance of the above catalytic systems are discussed.
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