Citation: Sheng-Ping Wang, Wei Li, Yuan-Yuan Dong, Yu-Jun Zhao, Xin-Bin Ma. Effects of potassium promoter on the performance of PdCl₂-CuCl₂/AC catalysts for the synthesis of dimethyl carbonate from CO and methyl nitrite[J]. Chinese Chemical Letters, ;2015, 26(11): 1359-1363. doi: 10.1016/j.cclet.2015.06.008 shu

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

1.
Key Laboratory for Green Chemical Technology, School of Chemical Engineering and Technology, Tianjin University, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China

Corresponding author: Xin-Bin Ma,
Received Date: 8 May 2015
Available Online: 2 June 2015

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: KCl > KOH > CH₃COOK > K₂CO₃. Especially, the addition of KCl 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 KCl 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 KCl benefited the reactivity of PdCl₂- CuCl₂/AC catalyst for DMC synthesis from CO and MN.
- Dimethyl carbonate
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