Adsorption on low cost minerals is thought to be an interesting technology to reduce alkali concentration in syngas generated by agro-based biomass gasification. In this work, six samples of natural mineral sorbents were exposed to vapor of NaCl under dry and humid environments, at total pressures of 5 mbar and 1 bar, and at temperatures of 700, 775 and 850 °C in order to evaluate their uptake capacities by using thermogravimetry coupled with mass spectrometry. While under dry conditions physisorption seems to be the dominant mechanism, under humid conditions chemisorption contributes to a significant rise in the uptake for most of the cases. Bauxite, palygorskite and natural zeolite presented the best uptakes on average under both dry and humid conditions. Sorbents containing moderate to high contents of Al seem to be suitable materials for alkali/vapor removal.

低成本矿物上的吸附被认为是降低由农业生物质气化产生的合成气中碱浓度的有趣技术。在这项工作中，六种天然矿物吸附剂样品在干燥和潮湿的环境中，总压力为5 mbar和1 bar，温度为700、775和850°C的情况下暴露于NaCl蒸气中，以评估其吸收能力通过结合使用热重分析和质谱分析。虽然在干燥条件下，物理吸附似乎是主要的机理，但在大多数情况下，在潮湿条件下，化学吸附会导致摄取量显着增加。在干燥和潮湿条件下，铝土矿，坡缕石和天然沸石均表现出最佳的吸收率。