Design Strategies for a Denitrification Catalyst with Improved Resistance against Alkali Poisoning: The Significance of Nanoconfining Spaces and Acid–Base Balance,ChemCatChem

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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
ChemCatChem ( IF 3.8 ) Pub Date : 2016-01-08 , DOI: 10.1002/cctc.201501064
Penglu Wang _{1,

2} , Haiqiang Wang _{1,

2} , Xiongbo Chen ₃ , Zhongbiao Wu _{1,

2}

Affiliation

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 Ce⁴⁺/Ce³⁺ 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 NH₃ 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.

中文翻译：

具有提高的耐碱中毒能力的反硝化催化剂的设计策略：纳米空间和酸碱平衡的意义

基于对nanoconfining效应和酸碱平衡机制的思路，双重保护战略，旨在解决上发生的失活问题氧化铈基DENO _X催化剂。多层钛酸盐纳米管提供了纳米限制空间，并且通过对钛酸盐纳米管进行硫酸酸洗的改性，确保了酸碱平衡。铈土掺杂的0.1 mol L ^-1硫酸钛酸酯纳米管催化剂表现出出色的选择性催化还原（SCR）催化活性和增强的耐碱性。发现增强的耐碱性与理想的空心-管状结构，可重复的Ce ⁴⁺ / Ce ^3+有关氧化还原循环，增加表面酸位。原位漫反射红外傅里叶变换光谱进一步确定，酸度和碱度在K-Ce / 0.1STNTs上的平衡可确保吸附的NH ₃和NO _x物种的活性。因此，在硫酸盐催化剂上促进了SCR反应，并且在反应过程中可能同时发生Eley-Rideal和Langmuir-Hinshelwood机理。

更新日期：2016-01-08

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