Sorption of H2S and SO2 in MOFs: safe in situ experiments in new reversible systems

Hydrogen sulfide and sulfur dioxide are harmful pollutants commonly emitted by various industrial processes. Their efficient removal from air and exhaust gases is therefore crucial to meet environmental regulations and prevent environmental and health hazards. However, until now, experimental studies aiming at understanding the underlying adsorption mechanisms by means of X-ray diffraction (XRD) are lacking, and current knowledge mostly relies on simulations and spectroscopic data. In this proposal, we aim at investigating the sorption mechanisms of H2S and SO2 in several MOF systems, inside the safe and confined environment of a sealed capillary, avoiding the use of potential hazardous setups containing large amount of those gases. These experiments should enable to localize the gas molecules inside the MOF frameworks, to determine the occurrence of potential framework degradation and to measure adsorption isobars by varying the temperature of the sample contained in the capillary.

硫化氢（Hydrogen sulfide）与二氧化硫（sulfur dioxide）是各类工业过程中常见的有害污染物。因此，将其从空气与废气中高效脱除，对于符合环境法规、规避环境与健康危害至关重要。然而迄今为止，借助X射线衍射（X-ray diffraction, XRD）解析吸附内在机理的实验研究仍较为匮乏，现有认知大多基于模拟计算与光谱学数据。本研究计划旨在探究硫化氢与二氧化硫在多种金属有机骨架（Metal-Organic Framework, MOF）材料中的吸附机理，实验将在密封毛细管的安全受限环境中开展，避免使用容纳大量目标气体的潜在危险实验装置。本实验将实现以下目标：定位MOF骨架内的气体分子分布，判断骨架是否发生潜在降解，并通过改变毛细管内样品的温度，测定吸附等压线。