在Co(1.5)PW(12)O(40) 凯琴型杂多阴离子上由甲醇和二氧化碳气相合成碳酸二甲酯

Gas-phase synthesis of dimethyl carbonate from methanol and carbon dioxide over Co(1.5)PW(12)O(40) Keggin-type heteropolyanion.

作者信息

Aouissi Ahmed, Al-Othman Zeid Abdullah, Al-Amro Amro

机构信息

Department of Chemistry, King Saud University, Riyadh, Saudi Arabia.

出版信息

Int J Mol Sci. 2010 Mar 31;11(4):1343-51. doi: 10.3390/ijms11041343.

DOI:10.3390/ijms11041343

PMID:20480023

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC2871119/

Abstract

The reactivity of Co(1.5)PW(12)O(40) in the direct synthesis of dimethyl carbonate (DMC) from CO(2) and CH(3)OH was investigated. The synthesized catalyst has been characterized by means of FTIR, XRD, TG, and DTA and tested in gas phase under atmospheric pressure. The effects of the reaction temperature, time on stream, and methanol weight hourly space velocity (MWHSV) on the conversion and DMC selectivity were investigated. The highest conversion (7.6%) and highest DMC selectivity (86.5%) were obtained at the lowest temperature used (200 degrees C). Increasing the space velocity MWHSV increased the selectivity of DMC, but decreased the conversion. A gain of 18.4% of DMC selectivity was obtained when the MWHSV was increased from 0.65 h(-1) to 3.2 h(-1).

摘要

研究了Co(1.5)PW(12)O(40)在由CO(2)和CH(3)OH直接合成碳酸二甲酯（DMC）中的反应活性。通过傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、热重分析（TG）和差示热分析（DTA）对合成的催化剂进行了表征，并在常压气相条件下进行了测试。考察了反应温度、空时和甲醇质量空速（MWHSV）对转化率和DMC选择性的影响。在使用的最低温度（200℃）下获得了最高转化率（7.6%）和最高DMC选择性（86.5%）。提高空速MWHSV可提高DMC的选择性，但会降低转化率。当MWHSV从0.65 h(-1)提高到3.2 h(-1)时，DMC选择性提高了18.4%。