Direct catalytic production of dimethyl ether from CO and CO2: A review

Asieh Akhoondi, A. Osman, A. Eslami
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引用次数: 7

Abstract

Dimethyl ether (DME) is a synthetically produced alternative fuel to diesel-based fuel and could be used in ignition diesel engines due to increasing energy demand. DME is considered extremely clean transportation and green fuel because it has a high cetane number (around 60), low boiling point (−25 °C), and high oxygen amount (35 wt%) which allow fast evaporation and higher combustion quality (smoke-free operation and 90% fewer NOx emissions) than other alternative CO2-based fuels. DME can be synthesized from various routes such as coal, petroleum, and bio-based material (i.e., biomass and bio-oil). Dimethyl ether can be produced from CO2 to prevent greenhouse gas emissions. This review aims to summarize recent progress in the field of innovative catalysts for the direct synthesis of dimethyl ether from syngas (CO+H2) and operating conditions. The problems of this process have been raised based on the yield and selectivity of dimethyl ether. However, regardless of how syngas is produced, the estimated total capital and operating costs in the industrial process depend on the type of reactor and the separation method.
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CO和CO2直接催化生产二甲醚的研究进展
二甲醚(DME)是一种合成生产的柴油基燃料的替代燃料,由于能源需求的增加,可以用于柴油发动机的点火。二甲醚被认为是非常清洁的运输和绿色燃料,因为它具有高十六烷值(约60),低沸点(- 25°C)和高含氧量(35 wt%),与其他替代的二氧化碳基燃料相比,它允许快速蒸发和更高的燃烧质量(无烟操作和减少90%的氮氧化物排放)。二甲醚可以通过多种途径合成,如煤、石油和生物基材料(即生物质和生物油)。二甲醚可以从二氧化碳中产生,以防止温室气体的排放。本文综述了合成气(CO+H2)直接合成二甲醚的新型催化剂及其操作条件的研究进展。根据二甲醚的收率和选择性,提出了该工艺存在的问题。然而,不管合成气是如何产生的,工业过程中估计的总资本和运行成本取决于反应器的类型和分离方法。
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