Abstract MIL-53(Fe) was synthesized using a “modulator approach” that utilizes acetic acid (HAc) as an additive to control the size and morphology of the resulting crystals. We demonstrate that after activation under vaccum at 100 °C, the MIL-53(Fe) functions well for H2S selective oxidation. The introduction of acetic acid in the presence of benzene-1,4-dicarboxylic acid (H2BDC) would result in a series of MIL-53(Fe) nanocrystals (denoted as MIL-53(Fe)-xH, x stands for the volume of added HAc with morphology evoluting from irregular particles to short hexagonal columns. The vacuum treatment facilitates the removal of acetate groups, thus generating Fe3+ Lewis acid sites. Consequently, the resulted MIL-53(Fe)-xH exhibits good catalytic activity (98% H2S conversion and 92% sulfur selectivity) at moderate reaction temperatures (100–190 °C). The MIL-53(Fe)-5H is superior to the traditional iron-based catalysts, showing stable performance in a test period of 55 h.

中文翻译：

---

乙酸调制的 MIL-53(Fe) 的形态演变以有效选择性氧化 H2S

摘要 MIL-53(Fe) 是使用“调节剂方法”合成的，该方法利用乙酸 (HAc) 作为添加剂来控制所得晶体的尺寸和形态。我们证明，在 100 °C 真空下活化后，MIL-53(Fe) 可以很好地用于 H2S 选择性氧化。在苯-1,4-二羧酸 (H2BDC) 存在下引入乙酸将产生一系列 MIL-53(Fe) 纳米晶体（表示为 MIL-53(Fe)-xH，x 代表体积添加的HAc形态从不规则颗粒演变为短六角柱。真空处理有利于去除乙酸基团，从而产生Fe3+路易斯酸位点。因此，所得的MIL-53(Fe)-xH表现出良好的催化活性（98%） H2S 转化率和 92% 的硫选择性）在中等反应温度（100–190 °C）。