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摘要
Based on the ideas of the nanoconfining effect and the acid-base balance mechanism, a dual-protection strategy was designed to solve the deactivation problem that occurs on ceria-based deNO(x) catalysts. The nanoconfining spaces were provided by multilayer titanate nanotubes, and the acid-base balance was guaranteed by the modification of sulfuric acid pickling on titanate nanotubes. The ceria-doped 0.1molL(-1) sulfated titanate nanotubes catalyst exhibited an excellent selective catalytic reduction (SCR) catalytic activity and enhanced alkali resistance. It was found that the enhanced alkali resistance was relevant for the perfect hollow-tubular structure, repeatable Ce4+/Ce3+ redox cycles, and increased surface acid sites. Insitu diffuse reflectance infrared Fourier transform spectroscopy further identified that the balance of acidity and basicity on K-Ce/0.1STNTs ensured the activity of adsorbed NH3 and NOx species. The SCR reaction was thus facilitated over the sulfated catalysts and both the Eley-Rideal and Langmuir-Hinshelwood mechanisms may occur during the reaction.
- 出版日期2016-2-18
- 单位浙江大学; 环境保护部华南环境科学研究所
