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Continuous reactor for renewable methanol
Green Chemistry ( IF 9.8 ) Pub Date : 2020-11-5 , DOI: 10.1039/d0gc03115a
Athanasios A. Tountas 1, 2, 3, 4 , Geoffrey A. Ozin 2, 3, 4, 5 , Mohini M. Sain 1, 2, 3, 4, 6
Affiliation  

For society and corporations to decisively shift to fossil fuel alternatives and avoid the likely devastating consequences of climate change and ecosystem destruction of ‘business-as-usual’, a renewable pathway to carbon net-neutral or net-negative feedstocks is of utmost importance. Methanol (MeOH) is a promising candidate but is still produced with conventional natural gas to syngas technology. The need for fossil-free and less costly syngas routes to MeOH has been the focus of immense academic effort. Towards this end, this study details a version 1.0 tool for investigating prospective photochemical and thermal heterogeneous MeOH synthesis catalysts and present thermal benchmarking data with a commercial copper–zinc oxide-alumina (CZA) catalyst. The testing conditions use a 3 : 1 H2 : CO2 syngas ratio, temperatures from <448–533 K (<175–260 °C), and pressure up to 0.78 MPa. These conditions allow for more efficient CO2 utilization by improving low-temperature MeOH yield and reducing capital and operating costs of process equipment. The reactor performance is validated with respect to the literature and also a rate model based on a Langmuir–Hinshelwood–Hougen–Watson (LHHW) mechanism with good agreement. This verifies that the system behaves isothermally and predictably. This unique system can be configured to screen catalysts both thermally and with light, and expanded to commercial test conditions and scales. At aspirational low-temperature and low-pressure conditions, 398 K (125 °C) and 1.0 MPa (comparable P to this study), the MeOH equilibrium per-pass yield is a respectable 8.8 mol% with comparable high-P equipment costs to current commercial operations.

中文翻译:

可再生甲醇的连续反应器

为了使社会和企业果断地转向使用化石燃料替代品,并避免气候变化和“一切照旧”对生态系统造成破坏性破坏的后果,最重要的是采用可再生的途径实现碳中和或碳负原料。甲醇(MeOH)是很有前途的候选者,但仍使用常规天然气制合成气技术生产。寻求无化石和成本更低的合成气路线制甲醇一直是巨大的学术研究重点。为此,本研究详细介绍了用于研究预期的光化学和热非均相MeOH合成催化剂的1.0版工具,并使用商业化的铜-氧化锌-氧化铝(CZA)催化剂提供了热基准数据。测试条件使用3:1 H 2  :CO 2合成气比,温度从<448–533 K(<175-260°C)和压力高达0.78 MPa。这些条件通过提高低温MeOH的收率并减少工艺设备的投资和运营成本,可以更有效地利用CO 2。该反应堆的性能已根据文献进行了验证,并且也基于基于Langmuir-Hinshelwood-Hougen-Watson(LHHW)机理的速率模型进行了验证,具有良好的一致性。这验证了系统等温且可预测地运行。该独特的系统可以配置为热和光筛选催化剂,并扩展到商业测试条件和规模。在理想的低温和低压条件下,398 K(125°C)和1.0 MPa(可比P(对于本研究而言),MeOH平衡的单程收率约为8.8 mol%,且高P设备的成本与目前的商业运行相当。
更新日期:2020-12-17
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