Herein, the role of swellability and hydrophobicity of swellable organically modified silica (SOMS) in shielding Pd against deactivation due to HCl produced during hydrodechlorination (HDC) of trichloroethylene (TCE) is investigated. The extent of surface derivatization during sol gel synthesis of SOMS was found to directly impact the extent of hydrophobicity, swellability and surface area, as confirmed by infrared spectroscopy and N₂ physisorption, respectively. Furthermore, after Pd impregnation, the resultant particle size, location, and atomic environment of Pd were also dictated by the extent of support derivatization such that the least derivatized material provided lowest protection to Pd from HCl. Post HCl-treatment, the batch activity rate constants decreased by 66% for the least derivatized sample and 17% for the most derivatized one, suggesting that hydrophobicity and swellability are essential for obtaining high resistance to HCl which could potentially impact the economic viability of HDC of TCE process.

本文研究了可溶胀性有机改性二氧化硅 (SOMS) 的溶胀性和疏水性在保护 Pd 免受三氯乙烯 (TCE) 加氢脱氯 (HDC) 过程中产生的 HCl 引起的失活中的作用。_{红外光谱和 N 2}证实，SOMS 的溶胶凝胶合成过程中表面衍生化程度直接影响疏水性、溶胀性和表面积的程度物理吸附，分别。此外，在 Pd 浸渍后，Pd 的最终粒径、位置和原子环境也由载体衍生化程度决定，这样衍生化程度最低的材料对 Pd 的 HCl 保护作用最低。在 HCl 处理后，衍生化程度最低的样品的批活性速率常数降低了 66%，衍生化程度最高的样品降低了 17%，这表明疏水性和溶胀性对于获得对 HCl 的高抗性至关重要，这可能会影响 HDC 的经济可行性TCE 过程。