Effects of Different Copper Species on the Combustion of Dichloromethane over Cu/HZSM-5 Zeolite Nanoporous Catalysts,ACS Applied Nano Materials

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Effects of Different Copper Species on the Combustion of Dichloromethane over Cu/HZSM-5 Zeolite Nanoporous Catalysts
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2021-01-28 , DOI: 10.1021/acsanm.0c03156
Yue Liu ₁ , Yanye Zhu ₁ , Wenzuo Huang ₁ , Qingji Ying ₁ , Zhongbiao Wu _{1,

2}

Affiliation

This study compared the reaction behaviors of dichloromethane (DCM) catalytic combustion over Cu/HZSM-5 (H form of Zeolite Socony Mobil-5) nanoporous catalysts at different copper loadings. Among the samples investigated, Cu/HZSM-5 with 2.5 wt % Cu showed the best stability with a 90% DCM conversion at 320 °C during a 3 h reaction run. The analysis of the results showed different copper species (including cations and oxides particles) accounted for the diverse reaction behaviors observed. With a low copper loading (≤2.5 wt %), copper cations (such as isolated Cu⁺/Cu²⁺ and oxocations) were the dominant copper species, which were strongly resistant to chlorine poisoning. However, we found the continuous coking deactivation of Cu/HZSM-5 with 1 wt % Cu loading owing to its low redox capacity. With further increase in the Cu content, the proportion of bulk-like CuO_x species quickly increased. During the reaction with DCM, CuO_x particles were involved in a chlorination process at a bulk level with the formation of CuCl_x and Cu_x(OH)_yCl crystalline phases, resulting in a rapid deactivation at the initial reaction stage. Cation-dominant copper nanomaterials are recommended for reaching a high stability in chlorinated volatile organic compound catalytic oxidation.

中文翻译：

Cu / HZSM-5沸石纳米孔催化剂上不同铜形态对二氯甲烷燃烧的影响

这项研究比较了在不同铜负载下，二氯甲烷（DCM）在Cu / HZSM-5（H型沸石Socony Mobil-5的H形式）纳米多孔催化剂上的催化燃烧反应行为。在所研究的样品中，Cu / HZSM-5和Cu的含量为2.5 wt％，在3小时的反应过程中，在320°C时，DCM转化率为90％，显示出最佳的稳定性。结果分析表明，不同的铜种类（包括阳离子和氧化物颗粒）说明了观察到的各种反应行为。铜负载量低（≤2.5wt％）时，铜阳离子（如孤立的Cu ⁺ / Cu ²⁺和含氧化合物）是占主导地位的铜，对氯中毒具有很强的抵抗力。然而，由于其低氧化还原容量，我们发现具有1wt％的铜负载量的Cu / HZSM-5连续焦化失活。随着Cu含量的进一步增加，块状CuO _x物种的比例迅速增加。在与DCM反应期间，CuO _x颗粒以整体水平参与氯化过程，形成CuCl _x和Cu _x（OH）_y Cl结晶相，导致在初始反应阶段迅速失活。推荐使用阳离子为主的铜纳米材料，以便在氯化挥发性有机化合物的催化氧化中达到较高的稳定性。

更新日期：2021-02-26

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