Washcoated zeolite structured adsorbents for CO2 capture and recovery by rotary adsorption

Ziyi Li , Cong Wang , Jin Xiao , Xu Jiang , Ningqi Sun , Xiong Yang , Yingshu Liu
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Abstract

Adsorption has long been recognized as a vital and extensively utilized technology for CO2 capture, for which developing a cost-effective process is a long-sought goal. The structured adsorbent with faster heat and mass transfer, present new opportunities for advancing rotary adsorption process, however, lacks comprehensive evaluation and discussion on CO2 sorption. In this study, structured adsorbents were prepared by washcoating commercial NaY and 13X zeolites onto a fiberglass honeycomb support. A series of characterizations and breakthrough test demonstrated the advantages of structured adsorbents over conventional pellets. NaY zeolite emerged as the thermodynamically and kinetically preferred CO2 adsorbent, exhibiting an equilibrium adsorption capacity of 5.972 mmol·g-1 and an internal mass transfer coefficient of 5.12 × 10–3 s-1 (15 % CO2, 298 K, 1 bar). These values are 18.3 % and 164 % higher than those of its pellet counterpart and 12.3 % and 36.9 % higher than those of the 13X honeycomb. NaY's great adaptability across various applications was indicated by its breakthrough capacities at different temperatures and CO2 feed concentrations, as well as the minimal influence of feed gas flow rate on CO2 adsorption equilibrium and kinetics. By employing a recirculating thermal desorption strategy, CO2 can be enriched from 5 % to 61 %, 15 % to 79 %, and 55 % to 92 %, achieving a 90 % recovery under mild desorption conditions. A two-stage rotary adsorption process for low-concentration CO2 capture was proposed, enabling CO2 enriched from 5 % to 55 % in the first stage, and further to 90 % in the second stage. This work introduces a promising approaches for low-cost industrial carbon capture and even direct air carbon capture.
水洗包覆沸石结构吸附剂的二氧化碳捕获和回收的旋转吸附
长期以来,吸附一直被认为是一种重要的、广泛应用的二氧化碳捕获技术,开发一种具有成本效益的方法是一个长期追求的目标。结构吸附剂具有更快的传热传质速度,为推进旋转吸附工艺提供了新的机遇,但对CO2的吸附还缺乏全面的评价和探讨。在本研究中,通过在玻璃纤维蜂窝支架上水洗涂覆商业NaY和13X沸石来制备结构吸附剂。一系列的表征和突破性试验证明了结构吸附剂相对于传统颗粒的优势。NaY沸石在15% CO2, 298 K, 1 bar条件下的平衡吸附容量为5.972 mmol·g-1,内部传质系数为5.12 × 10-3 s-1,是热力学和动力学上的首选CO2吸附剂。这些数值分别比颗粒型高18.3%和164%,比13X蜂窝型高12.3%和36.9%。NaY在不同温度和不同CO2进料浓度下的突破能力,以及进料气流量对CO2吸附平衡和动力学的影响最小,表明其具有很强的适应性。通过采用循环热解吸策略,在温和的解吸条件下,CO2可富集5% ~ 61%、15% ~ 79%和55% ~ 92%,回收率达到90%。提出了一种两级旋转吸附低浓度CO2捕集工艺,可使CO2在第一级从5%富集到55%,在第二级进一步富集到90%。这项工作介绍了一种有前途的低成本工业碳捕集甚至直接空气碳捕集方法。
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