Direct conversion of methane into methanol
Direct conversion of methane into methanol
复制标题
DOI：
10.1039/f19898503561
复制
发表时间：
1989
期刊：
影响因子：
--
通讯作者：
R. Burch;G. D. Squire;S. Tsang
中科院分区：
文献类型：
--
作者：
R. Burch;G. D. Squire;S. Tsang
在流动微反装置上对甲烷直接氧化制甲醇进行了研究。考察了反应器类型、温度、压力、停留时间、氧含量、气体混合和稀释对甲醇选择性的影响。结果表明，在相对较低的压力下，使用金属反应器和/或催化剂会导致完全氧化产物的形成。然而，在较高的压力下，所研究的任何实验参数都不会对甲醇的选择性产生显著影响，在所有情况下，甲醇的选择性约为40%，远低于最近发表的文献中的说法。对甲醇在有氧存在的高温高压下稳定性的研究表明，除铜等金属外，甲醇通过进一步氧化而损失并不重要。在甲烷和氧气存在的情况下，一些甲醇被破坏，这归因于甲烷被氧气活化时产生的甲基自由基的反应。然而，甲醇的这种损失不足以解释观察到的低总体选择性。结果表明，反应器的详细设计可能是获得高甲醇产率的关键。
The direct oxidation of methane into methanol has been studied in a flow microreactor. The effects, on the selectivity to methanol, of the type of reactor, temperature, pressure, residence time, oxygen content, gas mixing and dilution, have been investigated. The results show that at relatively low pressures the use of metallic reactors and/or catalysts leads to the formation of complete oxidation products. However, at higher pressures none of the experimental parameters studied has a significant influence on the selectivity to methanol, which in all cases is ca. 40 %, much lower than claimed in recent publications. Investigations of the stability of methanol at high temperatures and pressures in the presence of oxygen show that loss of methanol through further oxidation is unimportant except in the presence of metals such as Cu. In the presence of methane and oxygen some methanol is destroyed, and this is attributed to reactions involving methyl radicals produced during the activation of methane by oxygen. However, this loss of methanol is insufficient to account for the low overall selectivity observed. It is concluded that the detailed design of the reactor may be of critical importance in obtaining high methanol yields.