在真空变压吸附装置中将无粘合剂 LTA 和 SAPO-34 珠子作为二氧化碳吸附剂用于沼气升级的评估

IF 3.2 Q2 CHEMISTRY, PHYSICAL
Energy advances Pub Date : 2024-05-31 DOI:10.1039/D4YA00007B
Dina G. Boer, Henk H. van de Bovenkamp, Jort Langerak, Benny Bakker and Paolo P. Pescarmona
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引用次数: 0

摘要

利用真空变压吸附(VSPA)选择性吸附二氧化碳进行沼气提纯是一项能够利用分离出的生物甲烷直接替代天然气的技术。在这项工作中,我们首次报告了在 VPSA 设置中将具有分层多孔性的 LTA 和 SAPO-34 大颗粒作为二氧化碳吸附剂的研究。虽然通常需要粘合剂才能将沸石和沸石原型塑造成应用于 VPSA 柱所需的宏观形式(如珠子、颗粒),但本研究对无粘合剂的 LTA 和 SAPO-34 珠子进行了研究,并将其与含有粘合剂的商用沸石 4A 珠子进行了比较。在单个吸附塔中用模拟沼气的混合气体(即 40% 的 CO2 和 60% 的 CH4)进行了二元突破实验,最高压力为 4 巴。与 LTA 珠子相比,SAPO-34 珠子的突破速度稍快,尾迹不明显,这是因为 SAPO-34 的框架结构不同,晶体内扩散速度较快,而且与 LTA 珠子相比,SAPO-34 珠子对 CO2 的吸附强度较低。值得注意的是,与商用 4A 珠子相比,无粘合剂的 LTA 和 SAPO-34 珠子都显示出略微尖锐的突破和较不明显的拖尾。这要归功于无粘合剂珠子的开放和可进入的分层孔隙结构。SAPO-34 珠子的二氧化碳吸附容量在 5 个周期内相对稳定,而 LTA 和商用 4A 珠子的吸附容量从第一个周期到第二个周期显著下降。SAPO-34 珠子在突破时的循环吸附容量约为 2 mmol g 1,二氧化碳生产率为 3 mol kg-1 h-1。这些数值明显高于 LTA 和商用 4A 珠子,因此 SAPO-34 珠子有望在 VPSA 中得到工业应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Evaluation of binderless LTA and SAPO-34 beads as CO2 adsorbents for biogas upgrading in a vacuum pressure swing adsorption setup†

Evaluation of binderless LTA and SAPO-34 beads as CO2 adsorbents for biogas upgrading in a vacuum pressure swing adsorption setup†

Biogas upgrading by selective adsorption of CO2 using vacuum pressure swing adsorption (VPSA) is a technology that can enable the utilization of the isolated biomethane as a direct replacement for natural gas. In this work, we report for the first time the investigation of LTA and SAPO-34 macroscopic beads with hierarchical porosity as CO2 adsorbents in a VPSA setup. While a binder is generally required to shape zeolites and zeotypes into the macroscopic format (e.g. beads, pellets) needed for application in a VPSA column, in this work binderless LTA and SAPO-34 beads were studied and compared with commercial binder-containing zeolite 4A beads. Binary breakthrough experiments were conducted with a gas mixture mimicking biogas (i.e. 40 vol% CO2 and 60 vol% CH4) in a single adsorption column up to 4 bar. The SAPO-34 beads displayed a slightly steeper breakthrough with less significant tailing compared to the LTA beads, which was ascribed to faster intra-crystalline diffusion due to the different framework structure and the lower adsorption strength of CO2 on SAPO-34 compared to LTA. Notably, both the binderless LTA and SAPO-34 beads displayed a slightly sharper breakthrough and less significant tailing compared to commercial 4A beads. This was attributed to the open and accessible hierarchical pore structure of the binderless beads. The CO2 adsorption capacity for the SAPO-34 beads was relatively stable over 5 cycles, while the LTA and commercial 4A beads displayed a significant decrease in adsorption capacity from the first to the second cycle. For the SAPO-34 beads, a cyclic adsorption capacity at breakthrough around 2 mmol g−1 and a CO2 productivity > 3 mol kg−1 h−1 were achieved. These values are significantly higher than those of the LTA and commercial 4A beads, making the SAPO-34 beads a promising candidate for industrial application in VPSA.

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