Related Experiment Video
Updated: Sep 9, 2025

Protocol of Electrochemical Test and Characterization of Aprotic Li-O2 Battery
Published on: July 12, 2016
Poisoning mechanism of potassium and calcium on a Mn-based quasi-MOF de-NOx catalyst
Kunli Song1, Xiangbo Feng2, Xiaoqian Ju2
1Technological Institute of Materials & Energy Science (TIMES), Xi'an Key Laboratory of Advanced Photo-electronics Materials and Energy Conversion Device, School of Electronic Information, Xijing University, Xi'an 710123, China; State Key Laboratory of Electrical Insulation and Power Equipment, School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China; School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710072, China.
Abstract:
Despite extensive research on alkali resistance of denitrification (de-NOx) catalysts, the synergistic poisoning mechanism of alkali and alkaline-earth metals on de-NOx catalysts, particularly Mn-based catalysts, remains unresolved. This study investigates the co-poisoning effects of K and Ca on the de-NOx activity of Mn-based quasi-MOF (Metal Organic Framework) catalysts, specifically TEOS&Mn-BTC (a catalyst previously designed by our team, TEOS and BTC represent tetraethyl orthosilicate and trimesic acid, respectively). We found that the coexistence of K and Ca elevates the d-band center, which improves the electron mobility ability of the catalyst, thus enhancing the electron transfer between Mn and O in the Si-O-Mn electron-metal-carrier coordination structure, which further promotes the occurrence of acid and redox circulations while strengthening the electron-metal-carrier interaction. Moreover, the increase in the d-band center enhances the charge transfer between the catalyst and the adsorbate, thereby further enhancing the adsorption of NH3 and NO. These findings elucidate the anti-poisoning mechanism of TEOS&Mn-BTC and provide theoretical insights for designing alkali/alkaline-earth-resistant de-NOx catalysts.
Related Concept Videos
Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate
Alkali Metals
Table 1: Properties of the alkali metals
Ionic Strength: Effects on Chemical Equilibria
In this solution, the primary...
Qualitative Analysis
For instance, group IV...
Factors Affecting Solubility
Catalysis

