Journal of Molecular Catalysis A: Chemical p. 516 - 525 (2017)
Update date:2022-07-29
Topics:
Simaioforidou
Papastergiou
Margellou
Petrakis
Louloudi
Two types of heterogeneous catalytic materials, MnII-L3imid@Cox and MnII-L3imid@PCox, have been synthesized and compared by covalent grafting of a catalytically active [MnII-L3imid] complex on the surface of an oxidized activated carbon (Cox) and an oxidized pyrolytic carbon from recycled-tire char (PCox). Both hybrids are non-porous bearing graphitic layers intermixed with disordered sp2/sp3 carbon units. Raman spectra show that (ID/IG)activatedcarbon > (ID/IG)pyrolyticcarbon revealing that oxidized activated carbon(Cox) is less graphitized than oxidized pyrolytic carbon (PCox). The MnII-L3imid@Cox and MnII-L3imid@PCox catalysts were evaluated for alkene oxidation with H2O2 in the presence of CH3COONH4. Both showed high selectivity towards epoxides and comparing the achieved yields and TONs, they appear equivalent. However, MnII-L3imid@PCox catalyst is kinetically faster than the MnII-L3imid@Cox (accomplishing the catalytic runs in 1.5 h vs. 5 h). Thus, despite the similarity in TONs MnII-L3imid@PCox achieved extremely higher TOFs vs. MnII-L3imid@Cox. Intriguingly, in terms of recyclability, MnII-L3imid@Cox could be reused for a 2th run showing a ~20% loss of its catalytic activity, while MnII-L3imid@PCox practically no recyclable. This phenomenon is discussed in a mechanistic context; interlinking oxidative destruction of the Mn-complex with high TOFs for MnII-L3imid@PCox, while the low-TOFs of MnII-L3imid@Cox are preventive for the oxidative destruction of the Mn-complex.
View MoreQINGDAO DEVELOP chemistry Co.,Limited
Contact:+86-532-85807910
Address:98#Nanjing Road, Qingdao, China 266071
Yibin Hope Pharmaceutical Co., Ltd.
Contact:+86-831-5109851 86-831-5109836
Address:Luolong Industrial Zone,Nanxi, Yibin City, Sichuan, China. | Email: wishmarketing@gmail.com | Website: http://www.hopepharma.cc/
Dezhou Longteng Chemical Co., Ltd.
website:http://www.sodium-methoxide.cn/
Contact:0086-18866052283
Address:Xinhua Industrial Zone, Dezhou City, Shandong Province, China
Chongqing Yawei Fine Chemical Co.,Ltd
Contact:0086-23-62849407
Address:Ziyou village, Nanquan town, Banan district, Chongqing China
Guangzhou Chemical Reagent Factory
Contact:+86-20-8435 9820 or 8435 7345
Address:Southern Guangzhou, Guangdong, China
Doi:10.1016/0022-328X(86)80433-8
(1986)Doi:10.1021/tx9004538
(2010)Doi:10.1016/j.tet.2015.11.024
(2016)Doi:10.1039/tf9393501432
(1939)Doi:10.1021/ja00397a056
(1981)Doi:10.1002/ejoc.201800569
(2018)