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Design Strategies for a Denitrification Catalyst with Improved Resistance against Alkali Poisoning: The Significance of Nanoconfining Spaces and Acid–Base Balance
Author(s) -
Wang Penglu,
Wang Haiqiang,
Chen Xiongbo,
Wu Zhongbiao
Publication year - 2016
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201501064
Subject(s) - catalysis , inorganic chemistry , chemistry , selective catalytic reduction , adsorption , redox , sulfuric acid , titanate , alkali metal , base (topology) , diffuse reflectance infrared fourier transform , fourier transform infrared spectroscopy , chemical engineering , photocatalysis , organic chemistry , ceramic , mathematical analysis , mathematics , engineering
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 0.1 mol L −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 Ce 4+ /Ce 3+ redox cycles, and increased surface acid sites. In situ 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 NH 3 and NO x 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.