文章信息/Info

Title:

Research Progress of Mobile Source Molecular Sieve Denitrification Catalyst

文章編號(hào):

1674-3962(2024)09-0773-13

作者:

李昊; 鄧志權(quán); 李國(guó)波; 彭洪根

南昌大學(xué)資源與環(huán)境學(xué)院，江西 南昌 330031

Author(s):

Hao Li; Zhiquan Deng;  Guobo Li;  Honggen Peng

School of Resources and Environment, Nanchang University, 999 Xuefu Road, Nanchang, Jiangxi, 330031, P. R. China

關(guān)鍵詞:

選擇性催化還原; 分子篩; 反應(yīng)活性; 水熱穩(wěn)定性; 中毒及抗中毒

Keywords:

selective catalytic reduction;  molecular sieves;  reactivity;  hydrothermal stability;  poisoning and anti�瞤oisoning

分類號(hào):

TQ426；X511

DOI:

10.7502/j.issn.1674-3962.202402006

文獻(xiàn)標(biāo)志碼:

A

摘要:

柴油車尾氣是大氣中氮氧化物（NOx）的主要來源之一，NH3選擇性催化還原（NH3-SCR）是目前移動(dòng)源脫硝最成熟的技術(shù)手段。在過去的十幾年中，金屬基分子篩催化劑因其較寬的活性溫度窗口、較好的熱穩(wěn)定性的優(yōu)點(diǎn)，成為了柴油車尾氣脫硝催化劑的重點(diǎn)研究對(duì)象，其中，Cu基小孔分子篩催化劑已經(jīng)實(shí)現(xiàn)了商業(yè)化應(yīng)用。但日益嚴(yán)格的NOx排放標(biāo)準(zhǔn)對(duì)脫硝催化劑的低溫活性、水熱穩(wěn)定性和抗中毒性等性能提出了更高的要求。因此，許多學(xué)者圍繞分子篩催化劑的催化機(jī)理及改良策略進(jìn)行了更深入的研究，并取得了不錯(cuò)的進(jìn)展。從反應(yīng)機(jī)理、低溫活性、水熱穩(wěn)定性、中毒及抗中毒策略等方面綜述了分子篩NH3�睸CR催化劑的研究進(jìn)展，并對(duì)其應(yīng)用前景進(jìn)行了展望，旨在為高性能分子篩脫硝催化劑的開發(fā)提供理論指導(dǎo)。

Abstract:

Diesel vehicle exhaust is one of the main sources of nitrogen oxides (NOx) in the atmosphere, and selective catalytic reduction of NH3 (NH3-SCR) is the most mature technical means to remove NOx from mobile sources. In the past decade, metal-based molecular sieve catalysts have become the focus of NOx removal catalysts in diesel vehicle exhaust due to their advantages of wider activity temperature window and better thermal stability, among which, Cu�瞓ased small-pore molecular sieve catalysts have already been commercially applied. However, the increasingly stringent NOx emission standards have put forward higher requirements on the performance of denitrification catalysts in terms of low-temperature activity, hydrothermal stability, and resistance to toxicity. Therefore, many scholars have conducted more in-depth research on the catalytic mechanism and improvement strategy of molecular sieve catalysts, and good progress has been achieved. In this paper, the research progress of molecular sieve NH3-SCR catalysts is reviewed from the aspects of reaction mechanism, low-temperature activity, hydrothermal stability,poisoning and anti-poisoning strategy, and its application prospect is prospected, aiming to provide theoretical guidance for the development of high-performance molecular sieve denitrification catalysts.