Critical temperatures and pressures of nominal reacting mixture in synthesis of dimethyl carbonate （DMC） from methanol and carbon dioxide （quaternary mixture of carbon dioxide ＋ methanol ＋ water ＋ DMC） were mea...Critical temperatures and pressures of nominal reacting mixture in synthesis of dimethyl carbonate （DMC） from methanol and carbon dioxide （quaternary mixture of carbon dioxide ＋ methanol ＋ water ＋ DMC） were measured using a high-pressure view cell. The results suggested that the critical properties of the reacting mixture depended on the reaction extent as well as its initial composition （initial ratio of carbon dioxide to methanol）. Such information is essential for determining the reaction conditions when one intends to carry out the synthesis of DMC with CO2 and methanol under supercritical conditions.展开更多
The deactivation-regeneration of catalyst PdCl2-CuCl2-KOAc/AC in the synthesis of dimethyl carbonate （DMC） by gas-phase oxidative carbonylation was studied on the basis of XPS characterization and activity evaluatio...The deactivation-regeneration of catalyst PdCl2-CuCl2-KOAc/AC in the synthesis of dimethyl carbonate （DMC） by gas-phase oxidative carbonylation was studied on the basis of XPS characterization and activity evaluation.The reason for the catalyst deactivation is the loss of chlorine.The activity and stability of the fresh catalyst pretreated with methanol solution of methyl chloroacetate increases greatly.If the deactivated catalyst is treated with methanol solution of methyl chloroacetate and in N2 stream successively, the catalytic activity can be restored effectively and the regeneration induction period can be shortened.The catalytic activity after regeneration tiwice can still be restored to 93% of the fresh catalyst.展开更多
基金financial support of the State Key Fundamental Research Project(2006CB202504)the National Natural Science Foundation of China(No.20473110)Natural Science Foundation of Shanxi Province.
文摘Critical temperatures and pressures of nominal reacting mixture in synthesis of dimethyl carbonate （DMC） from methanol and carbon dioxide （quaternary mixture of carbon dioxide ＋ methanol ＋ water ＋ DMC） were measured using a high-pressure view cell. The results suggested that the critical properties of the reacting mixture depended on the reaction extent as well as its initial composition （initial ratio of carbon dioxide to methanol）. Such information is essential for determining the reaction conditions when one intends to carry out the synthesis of DMC with CO2 and methanol under supercritical conditions.
文摘The deactivation-regeneration of catalyst PdCl2-CuCl2-KOAc/AC in the synthesis of dimethyl carbonate （DMC） by gas-phase oxidative carbonylation was studied on the basis of XPS characterization and activity evaluation.The reason for the catalyst deactivation is the loss of chlorine.The activity and stability of the fresh catalyst pretreated with methanol solution of methyl chloroacetate increases greatly.If the deactivated catalyst is treated with methanol solution of methyl chloroacetate and in N2 stream successively, the catalytic activity can be restored effectively and the regeneration induction period can be shortened.The catalytic activity after regeneration tiwice can still be restored to 93% of the fresh catalyst.
