Comparative Study on Removal of NOx and Soot with A-site Substituted La2NiO4 Perovskite-like by Different Valence Cation
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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 NOx by soot. La1.8Sr0.2NiO4 catalyst exhibited the best soot removal performance with Ti 331 °C and Tm 473 °C, while La1.8Na0.2NiO4 catalyst showed the highest NOx conversion of 90%. Based on in situ DRIFTS and other characterization results, a possible mechanism for simultaneous removal of NOx and soot was proposed.
KeywordsSoot-NOx Simultaneous removal Perovskite-like oxides A-site substitution
This work was supported by Advanced Technique Project Funds of the Manufacture and Information Ministry, Heilongjiang Province Science Foundation Project Plan (Grant No. E2017027), the Fundamental Research Funds for the Central Universities of Harbin Engineering University (Grant No. HEUCFP201807) and the National Key Research and Development Program of China(Grant No. 2016YFC0205200). And we thank Zhijuan Zhao and Xiaoyu Zhang from Analysis and Test Center of Chinese Sciences Academy Institute of Chemistry for their help in XPS.
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Conflict of interest
We declare that no conflict of interest exists.
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