Comparative Study on Removal of NO x and Soot with A-site Substituted La 2 NiO 4 Perovskite-like by Different Valence Ca
- PDF / 2,000,097 Bytes
- 13 Pages / 595.276 x 790.866 pts Page_size
- 90 Downloads / 176 Views
Comparative Study on Removal of NOx and Soot with A-site Substituted La2NiO4 Perovskite-like by Different Valence Cation Lei Mao1 · Yongyi Yan1 · Xuteng Zhao1 · Maochen Fu1 · Youhong Xiao2 · Guojun Dong1 Received: 18 July 2018 / Accepted: 27 January 2019 / Published online: 8 February 2019 © Springer Science+Business Media, LLC, part of Springer Nature 2019
Abstract La1.8M0.2NiO4 (M = Na+, Sr2+, Ce3+) perovskite-like catalysts were prepared by citric acid complexation method. XRD, BET, FT-IR, SEM, XPS, H2-TPR, O2-TPD, MS-Soot-TPR, MS-NO-TPD and catalytic activity measurements were carried out to investigate the effect of A-site substitution on structure and catalytic performance for simultaneous removal soot and NOx. The characterization results show that La1.8M0.2NiO4 catalyst has high concentration of oxygen vacancies, more surface active oxygen, more trivalent nickel ions and better reducibility, which determines its better catalytic performance. The introduction of low valence cations at the A site significantly reduces the characteristic combustion temperature of soot and effectively promotes the reduction of N Ox by soot. L a1.8Sr0.2NiO4 catalyst exhibited the best soot removal performance with Ti 331 °C and Tm 473 °C, while La1.8Na0.2NiO4 catalyst showed the highest N Ox conversion of 90%. Based on in situ DRIFTS and other characterization results, a possible mechanism for simultaneous removal of NOx and soot was proposed. Graphical Abstract
Keywords Soot-NOx · Simultaneous removal · Perovskite-like oxides · A-site substitution * Guojun Dong [email protected]
1 Introduction
1
Nowadays, as the main pollutants of diesel engine exhaust, NOx and soot pose a serious threat to the environment and human health [1]. Governments and international organizations have established strict laws and regulations to limit the emission of diesel engine pollutants [2, 3]. People try
Key Laboratory of Superlight Materials and Surface Technology of Education Ministry, College of Materials, Science and Chemical Engineering of Harbin Engineering University, Harbin 150001, China
College of Power and Energy Engineering of Harbin Engineering University, Harbin 150001, China
2
13
Vol.:(0123456789)
1088
to meet the exhaust emission requirements through engine modification or fuel pretreatment. However, there is a tradeoff effect between PM and NOx in the combustion process of diesel engine, and it is difficult to meet both emission requirements by relying solely on in-plane control technology [4]. Therefore, diesel engine exhaust post-processing technology emerges as the times require [5]. Yoshida et al. [6] proposed using diesel particulate filter (DPF) to capture soot particles. Although it can effectively reduce soot emissions, but only the PM is filtered and collected in the filter, the filter itself can not remove PM, and the continuous accumulation of particulates in the filter will lead to lower filtration efficiency. Therefore, the researchers put forward the idea of removing NOx and soot simult
Data Loading...
