Institute of Catalysis, Zhejiang University, Hangzhou 310028, China.
College of Materials and Chemistry, China Jiliang University, Hangzhou 310018, China.
J Environ Sci (China). 2021 Sep;107:87-97. doi: 10.1016/j.jes.2021.01.033. Epub 2021 Feb 12.
Micro-mesoporous ZSM-5 zeolites were obtained by the post-treatment of tetrahydroxy ammonium hydroxide (TPAOH) solution with different concentration. The hierarchical pore structure formed during the desilication process facilitates the dispersion of Pt nanoparticles and Pt/ZSM-5 catalysts exhibit rather high catalytic activity for the deep oxidation of various VOCs at low temperature. The catalyst treated with TPAOH of 0.1 mol/L (Pt/ZSM-5(0.1)) shows the lowest degradation temperature (T) of 128 and 142°C, respectively for benzene and n-hexane. Compared with the untreated Pt/ZSM-5 catalyst, the abundant mesopores, small Pt particle size and finely dispersed Pt contribute to the superior catalytic activity and stability of the Pt/ZSM-5 catalysts for VOCs removal. More importantly, the existence of HO in the feed gases hardly affected the activity of Pt/ZSM-5(0.1) catalyst at the low reaction temperature of 128°C, which is very important for VOCs low-temperature removal in the future practical applications.
介孔-微孔 ZSM-5 沸石通过用不同浓度的四羟铵氢氧化物（TPAOH）溶液进行后处理来获得。脱硅过程中形成的分级孔结构有利于 Pt 纳米粒子的分散，并且 Pt/ZSM-5 催化剂在低温下对各种挥发性有机化合物（VOCs）的深度氧化表现出相当高的催化活性。用 0.1mol/L 的 TPAOH 处理的催化剂（Pt/ZSM-5（0.1））对于苯和正己烷，分别显示出最低的降解温度（T）128 和 142°C。与未处理的 Pt/ZSM-5 催化剂相比，丰富的介孔、较小的 Pt 粒径和高度分散的 Pt 有助于提高 Pt/ZSM-5 催化剂对 VOCs 去除的催化活性和稳定性。更重要的是，在低反应温度 128°C 下，进料气中 HO 的存在几乎没有影响 Pt/ZSM-5（0.1）催化剂的活性，这对于未来实际应用中 VOCs 的低温去除非常重要。
