Effects of method of preparation on catalytic activity of Co–Zn double-metal cyanide catalysts for copolymerization of CO2 and epoxide

Enhanced precipitation of cyanide from electroplating wastewater via self-assembly of bimetal cyanide complex

“…Recently, bimetal cyanide complex (BMCC, Prussian blue analogue) and double metal cyanide bridging complex are reported to be promising catalysts [8,9]. These materials could be easily synthesized by co-precipitation.…”

Effect of Zn/Co initial preparation ratio in the activity of double metal cyanide catalysts for propylene oxide and CO2 copolymerization

“…The method of preparation including temperature, purity of feedstock, complexing agent and the mode of reagents addition has significant effects on the catalytic activity of the final DMC [5,17]. tert-Butanol (tBuOH) was used as complexing agent (CA) to help the retention of ZnCl2 in the catalyst [5] and the co-complexing agent (co-CA) PEG 1000, according to Guo et al., (2014) was used to decrease crystallinity and increase the catalytic activity [7].…”

“…Final composition of the different prepared catalysts analyzed by ICP. [12,17], the main characteristic vibration bands that appear in all DMC (Fig 1) are: at 470 cm -1 the Co-C stretching vibration indicates the presence of a coordinated tBuOH in different amounts, 642 cm -1 correspond to Co-C bounding, 1199 cm -1 to 3º-C-O stretch, 1372 cm -1 to -OH bending from tBuOH, 1473 to -CH scissoring, 1615 to -OH bending form water, 1738 correspond to the PEG incorporation into the catalyst, 2981 to -C-H stretch and the -OH stretch in all DMCs vibes from 3661 to 3296 cm -1 .…”

“…The PC production was controlled to be less than 5 % while the molar fraction of CO2 was more than 30 %. On the contrary, Sebastian and Srinivas [17] studied DMC catalysts prepared by different methods and their influence on catalytic activity for CHO-CO2 copolymerization. They reported that even with moderate crystallinity and without co-complexing agents the catalyst are high active for copolymerization, also, CO2 adsorption studies revealed that higher the guest-host interaction higher would be the catalytic activity, providing polycarbonates with CO2 incorporation as high as 86 mol%, average molecular weight of 20900 g/mol and polydispersity index of 1.8.…”

Synthesis of vegetable-oil based polymer by terpolymerization of epoxidized soybean oil, propylene oxide and carbon dioxide

“…To date substantial amount of literatures are available revealing different types of outstanding catalyst for the copolymerization process (Ang et al, 2015;Meng et al, 2016;Trott et al, 2016) ever since their discovery. Simultaneously, a number of epoxides and diverse operating conditions for the coupling of CO 2 and epoxides have been reported by devoted researchers (Dai et al, 2016;Darensbourg and Chung, 2014;Oh and Ko, 2013;Sebastian and Srinivas, 2014;Tang et al, 2013). Despite of the countless references available in this field, very few reported on the utilization of renewable bio-resources specifically vegetable oil-based epoxide in copolymerization with CO 2 .…”