02135nas a2200253   4500008004100000022001400041245011400055210006900169260000800238300001100246490000700257520127700264653002601541653001301567653002301580653002101603100002301624700001801647700002101665700001601686700002401702700002501726856013001751       2021                        eng d  a0019-452200aRole of preparation parameters of Cu-Zn mixed oxide catalyst in solvent free glycerol carbonylation with urea0 aRole of preparation parameters of CuZn mixed oxide catalyst in s  cJUL  a1000900 v983 aSolvent-free carbonylation of glycerol with urea to glycerol carbonate (GC) was achieved over heterogeneous Cu-Zn mixed oxide catalyst. Cu-Zn catalysts with different ratios of Cu:Zn were prepared using co-precipitation (CP) and oxalate gel (OG) methods. As compared to CuO-ZnO(2:1) catalyst prepared by oxalate gel (OG) method, much higher conversion of glycerol and highest selectivity towards glycerol carbonate (GC) was achieved with CuO-ZnO_CP(2:1) catalyst. Physicochemical properties of prepared catalysts were investigated by using XRD, FT-IR, BET, TPD of CO2 and NH3 and TEM techniques. The effect of stoichiometric ratio of Cu/Zn, calcination temperature of CuO-ZnO catalysts and effect of reaction parameters such as molar ratio of substrates, time and temperature on glycerol conversion to GC were critically studied. Cu/Zn of 2:1 ratio, glycerol-urea 1:1 molar ratio, 145 degrees C reaction temperatures were found to be optimized reaction conditions to achieve highest glycerol conversion of 86% and complete selectivity towards GC. The continuous expel of NH 3 from reaction the mixture avoided formation of ammonia complex with CuO-ZnO catalyst. As a result of this, CuO-ZnO catalyst could be recycled up to three times without losing its initial activity.10aCo-precipitation (CP)10aGlycerol10aGlycerol carbonate10aOxalate gel (OG)1 aCharate, Shrinivas1 aShinde, Suhas1 aKondawar, Sharda1 aDesai, Uday1 aWadgaonkar, Prakash1 aRode, Chandrashekhar  uhttps://library.ncl.res.in/content/role-preparation-parameters-cu-zn-mixed-oxide-catalyst-solvent-free-glycerol-carbonylation