Tejavath Vijaya, Kasarabada Viswateja, Gonuguntla Spandana, Perupoga Vijayanand, Nandury Satyanarayana V, Bojja Sreedhar, Pal Ujjwal
Department of Energy and Environmental Engineering, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India.
Academy of Scientific and Innovative Research (AcSIR), New Delhi 600113, India.
ACS Omega. 2021 Feb 19;6(9):6153-6162. doi: 10.1021/acsomega.0c05397. eCollection 2021 Mar 9.
Solid adsorbents with precise surface structural chemistry and porosity are of immense interest to decode the structure-property relationships and maintain an energy-intensive path while achieving high activity and durability. In this work, we reported a series of amine-modified zeolites and their CO capture efficiencies. The amine impregnated molecular zeolite compounds were characterized and systematically investigated for CO adsorption capacity through thermogravimetric analysis for the occurrence of atmospheric pure CO gas at 75 °C with diethylenetriamine (DETA), ethylenediamine (EDA), monoethanolamine (MEA), and triethanolamine (TEA)-loaded zeolite 13X, 4A, and 5A adsorbents. The kinetics of the adsorption study indicated that the adsorption capacity for CO adsorption was improved with amine loading up to a certain concentration over 13X-DETA-40, showing an adsorption capacity of 1.054 mmol of CO per gram of zeolite in a very short amount of time. The result was especially promising in terms of the initial adsorption capacity of zeolite, which adsorbed approximately 0.8 mmol/g zeolite within the first two minutes of experimentation. A detailed flow chart that includes a brief look into the process adopted for adsorption was included. Lagergren pseudo-first- and pseudo-second-order models of 40 wt % DETA zeolite 13X gave CO adsorption capacities of 1.055 and 1.058 mmol/g and also activation energies of 86 and 76 kJ/mol, respectively. The CO adsorption capacity of 13X-DETA-40 in a lab-scale reactor was found to be 1.69 mmol/g. A technoeconomic study was conducted for the solid amine zeolites to understand the investment per ton of CO adsorbed. This study was used as a basis to improve cost estimates from a microscale to a lab-scale reactor. The cost of investment for 13X-DETA-40 was reduced by 84% from $49,830/ton CO adsorbed in a microscale reactor to $7,690/ton of CO adsorbed in a lab-scale reactor.
具有精确表面结构化学和孔隙率的固体吸附剂对于解析结构-性能关系以及在实现高活性和耐久性的同时维持能源密集型路径具有极大的吸引力。在这项工作中，我们报道了一系列胺改性沸石及其CO捕获效率。对浸渍胺的分子沸石化合物进行了表征，并通过热重分析系统地研究了其在75°C下对大气纯CO气体的CO吸附容量，其中使用了负载二乙烯三胺（DETA）、乙二胺（EDA）、单乙醇胺（MEA）和三乙醇胺（TEA）的13X、4A和5A沸石吸附剂。吸附研究的动力学表明，在13X-DETA-40上，随着胺负载量增加到一定浓度，CO吸附容量得到提高，在非常短的时间内显示出每克沸石1.054 mmol CO的吸附容量。就沸石的初始吸附容量而言，该结果特别有前景，在实验的前两分钟内，沸石吸附了约0.8 mmol/g。其中包括一个详细的流程图，简要介绍了所采用的吸附过程。40 wt% DETA的13X沸石的Lagergren准一级和准二级模型给出的CO吸附容量分别为1.055和1.058 mmol/g，活化能分别为86和76 kJ/mol。在实验室规模的反应器中，13X-DETA-40的CO吸附容量为1.69 mmol/g。对固体胺沸石进行了技术经济研究，以了解每吨吸附的CO的投资情况。该研究被用作将成本估算从微观规模提高到实验室规模反应器的基础。13X-DETA-40的投资成本从微观规模反应器中每吨吸附CO的49,830美元降至实验室规模反应器中每吨吸附CO的7,690美元，降低了84%。
