Effects of potassium promoter on the performance of PdCl2-CuCl2/AC catalysts for the synthesis of dimethyl carbonate from CO and methyl nitrite

• Published in: Chinese chemical letters Vol. 26; no. 11; pp. 1359 - 1363
• Main Authors: Wang, Sheng-Ping, Li, Wei, Dong, Yuan-Yuan, Zhao, Yu-Jun, Ma, Xin-Bin
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.11.2015
• Subjects: Activated carbon; Dimethyl carbonate; K2CO3; Methyl nitrite; Potassium promoter; Wacker-type catalyst; X射线光电子能谱; 亚硝酸甲酯; 催化剂性能; 合成; 碳酸二甲酯; 钾助剂; Wacker-type catalyst; Potassium promoter; Dimethyl carbonate; Methyl nitrite; Activated carbon
• ISSN: 1001-8417; 1878-5964
• DOI: 10.1016/j.cclet.2015.06.008

The effect of potassium （K） promoter on the catalytic performance of activated carbon （AC） supported Wacker-type catalysts （PdCl2-CuCl2/AC） for the synthesis of dimethyl carbonate （DMC） from CO and methyl nitrite （MN） was investigated by means of N2 adsorption, H2-temperature-programmed reduction （H2-TPR）, and X-ray photoelectron spectroscopy （XPS）. The experimental results showed that the space time yield of DMC on Wacker-type catalysts with different K promoters ranked in the following order： KCI 〉 KOH 〉 CH3COOK 〉 K2CO3. Especially, the addition of KCI significantly improved the catalytic activities of PdCl2-CuCl2/AC catalyst for DMC synthesis from CO and MN. N2 adsorption data indicated that the addition of K promoters did not change the textural properties of Wacker-type catalysts greatly. H2-TPR and XPS results demonstrated that the existence of KCI promoted the reducibility of Cu2＋ species and increased the proportion of Cu2＋ species on catalyst surface, which is favorable for oxidizing Pd0 to active Pd2＋. Further, the addition of KCI benefited the reactivity of PdCI2- CuCl2/AC catalwt for DMC synthesis from CO and MN.