Abstract
The H2O resistance of low-temperature NH3-SCR catalysts is a key factor for practical applications. This work aims to strategically enhance the hydrophobicity of catalysts by intercalating surfactants into montmorillonite (M) via its cation exchange capacity. Various thermal pretreatment temperatures and chain lengths of surfactants have been used to enhance the hydrophobicity and interlayer spacing of montmorillonite, respectively. As a result, MnCe-M8-600 (with thermal pretreatment at 600 °C and the chain length of surfactant = 8) exhibits good low-temperature NH3-SCR performance and H2O resistance due to its labile oxygen, hydrophobicity, and structural stability. It is worth noting that the hydrophobicity of MnCe-M8-600 weakens the interaction between –OH and the catalyst, thereby continuously maintaining the redox ability and transferring electrons between Mn4+ and Ce3+. The results of the H2O resistance test showed that the NOX conversion of MnCe-M8-600 decreased by only 6% in the presence of 10% H2O, and its activity was fully recovered after turning off H2O. Hence, MnCe-M8-600 shows high activity and H2O resistance and is a promising catalyst for low-temperature NH3-SCR system applications.
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