Synthesis of propylene carbonate from urea and 1,2-propylene glycol over MnO2/γ-Al2O3 catalyst modified by NaOH
DU Zhiping, LIN Zhikun, CHEN Fangsheng, HU Xingxing, DING Yigang, CHI Ru'an, WU Yuanxin
CIESC Journal . 2014, (11): 4333 -4339 .  DOI: 10.3969/j.issn.0438-1157.2014.11.017