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双金属活性炭浸渍对硫化氢（HS）捕集吸附-解吸性能的影响

Effect of Bimetallic-Activated Carbon Impregnation on Adsorption-Desorption Performance for Hydrogen Sulfide (HS) Capture.

作者信息

Zulkefli Nurul Noramelya, Mathuray Veeran Loshinni S, Noor Azam Adam Mohd Izhan, Masdar Mohd Shahbudin, Wan Isahak Wan Nor Roslam

机构信息

Department of Chemical & Process Engineering, Faculty of Engineering & Built Environment, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia.

Fuel Cell Institute, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia.

出版信息

Materials (Basel). 2022 Aug 5;15(15):5409. doi: 10.3390/ma15155409.

DOI:10.3390/ma15155409
PMID:35955343
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9369974/
Abstract

This study reports on the impregnation of bi-metallic adsorbents based on commercial coconut activated carbon (CAC), surface-modified with metal acetate (ZnAc), metal oxide (ZnO and TiO), and the basic compound potassium hydroxide (KOH). The morphology of the adsorbents was then characterized with SEM-EDX, the microporosity was determined using Brunauer-Emmett-Teller (BET) analysis, the thermal stability was investigated via thermogravity analysis (TGA), and functional group analysis was undertaken with Fourier-transform infrared (FTIR) spectroscopy. These modified adsorbents were subjected to a real adsorption test for HS capture using a 1 L adsorber with 5000 ppm HS balanced for N, with temperature and pressure maintained at an ambient condition. Adsorption-desorption was carried out in three cycles with the blower temperature varied from 50 °C to 150 °C as the desorption condition. Characterization results revealed that the impregnated solution homogeneously covered the adsorbent surface, effecting the morphology and properties. Based on this study, it was found that ZnAc/TiO/CAC_DCM showed a significant increase in adsorption capacity with the different temperatures applied for the desorption in the second cycle: 1.67 mg HS/g at 50 °C, 1.84 mg HS/g at 100 °C, and 1.96 mg HS/g at 150 °C. ZnAc/ZnO/CAC_DCM seemed to produce the lowest percentage of degradation in the three cycles for all the temperatures used in the adsorption-desorption process. Therefore, ZnAc/ZnO/CAC_DCM has the potential to be used and commercialized for biogas purification for HS removal.

摘要

本研究报道了基于商业椰壳活性炭（CAC）制备双金属吸附剂的过程，该活性炭用金属醋酸盐（ZnAc）、金属氧化物（ZnO和TiO）以及碱性化合物氢氧化钾（KOH）进行了表面改性。然后用扫描电子显微镜-能谱仪（SEM-EDX）对吸附剂的形态进行了表征，使用布鲁诺尔-埃米特-特勒（BET）分析法测定了微孔率，通过热重分析（TGA）研究了热稳定性，并采用傅里叶变换红外（FTIR）光谱进行了官能团分析。这些改性吸附剂在一个1 L的吸附器中进行了实际的硫化氢（HS）捕获吸附试验，吸附器中含有5000 ppm的HS且氮气平衡，温度和压力保持在环境条件下。吸附-解吸过程进行了三个循环，解吸条件为将吹风机温度从50℃变化到150℃。表征结果表明，浸渍溶液均匀地覆盖在吸附剂表面，影响了其形态和性能。基于本研究，发现ZnAc/TiO/CAC_DCM在第二个循环中采用不同温度解吸时吸附容量显著增加：50℃时为1.67 mg HS/g，100℃时为1.84 mg HS/g，150℃时为1.96 mg HS/g。在吸附-解吸过程中使用的所有温度下，ZnAc/ZnO/CAC_DCM在三个循环中似乎产生的降解百分比最低。因此，ZnAc/ZnO/CAC_DCM有潜力用于沼气净化以去除HS并实现商业化。

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