Challiwala Mohamed S, Choudhury Hanif A, Wang Dingdi, El-Halwagi Mahmoud M, Weitz Eric, Elbashir Nimir O
Artie Mcferrin Department of Chemical Engineering, Texas A&M University, College Station, USA.
TEES Gas and Fuels Research Center, College Station, USA.
Sci Rep. 2021 Jan 14;11(1):1417. doi: 10.1038/s41598-021-80986-2.
Dry reforming of methane (DRM) is a well-known process in which CH and CO catalytically react to produce syngas. Solid carbon is a well-known byproduct of the DRM but is undesirable as it leads to catalyst deactivation. However, converting CO and CH into solid carbon serves as a promising carbon capture and sequestration technique that has been demonstrated in this study by two patented processes. In the first process, known as CARGEN technology (CARbon GENerator), a novel concept of two reactors in series is developed that separately convert the greenhouse gases (GHGs) into multi-walled carbon nanotubes (MWCNTs) and syngas. CARGEN enables at least a 50% reduction in energy requirement with at least 65% CO conversion compared to the DRM process. The second process presents an alternative pathway for the regeneration/reactivation of the spent DRM/CARGEN catalyst using CO. Provided herein is the first report on an experimental demonstration of a 'switching' technology in which CO is utilized in both the operation and the regeneration cycles and thus, finally contributing to the overall goal of CO fixation. The following studies support all the results in this work: physisorption, chemisorption, XRD, XPS, SEM, TEM, TGA, ICP, and Raman analysis.
甲烷干重整（DRM）是一个众所周知的过程，其中CH₄和CO₂发生催化反应生成合成气。固体碳是DRM过程中一种众所周知的副产物，但它是不受欢迎的，因为它会导致催化剂失活。然而，将CO₂和CH₄转化为固体碳是一种很有前景的碳捕获和封存技术，本研究通过两种专利工艺对此进行了验证。在第一个工艺中，即所谓的CARGEN技术（碳生成器），开发了一种串联两个反应器的新概念，该工艺将温室气体（GHG）分别转化为多壁碳纳米管（MWCNT）和合成气。与DRM工艺相比，CARGEN技术能使能源需求至少降低50%，CO₂转化率至少达到65%。第二个工艺提出了一种使用CO₂对失效的DRM/CARGEN催化剂进行再生/再活化的替代途径。本文首次报道了一种“切换”技术的实验演示，其中CO₂在操作和再生循环中均有应用，从而最终有助于实现CO₂固定的总体目标。以下研究支持了本工作中的所有结果：物理吸附、化学吸附、XRD、XPS、SEM、TEM、TGA、ICP和拉曼分析。
