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Issue 12, 2018
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Facile surface improvement method for LaCoO3 for toluene oxidation

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Abstract

The rational design of low-cost transition metal catalysts that exhibit high activity and selectivity may be the most significant area of investigation in heterogeneous catalysis. A selective dissolution method using acid solutions was previously reported to tune catalyst surfaces. In this work, LaCoO3 (LCO-0) perovskite catalysts were synthesized by the traditional citrate sol–gel method for toluene oxidation. The catalytic activity of the LaCoO3 treated with acetic acid (LCO-1) was significantly increased: the T90 of LCO-1 was 223 °C, which was 40 °C lower than that of the untreated catalyst (LCO-0) under a weight hourly space velocity (WHSV) of 60 000 mL g−1 h−1. The exposed A-site cations of perovskite were slightly etched, but still preserved the original framework according to XRD, TEM, SEM and ICP results. Moreover, LCO-1 exhibited excellent stability even after 500 °C calcination. The high catalytic performance was mainly associated with improvements in reducibility, surface oxygen vacancies and surface area. The high stability was due to the preservation of the perovskite structure after acetic acid treatment.

Graphical abstract: Facile surface improvement method for LaCoO3 for toluene oxidation

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Publication details

The article was received on 17 Apr 2018, accepted on 25 May 2018 and first published on 01 Jun 2018


Article type: Paper
DOI: 10.1039/C8CY00765A
Catal. Sci. Technol., 2018,8, 3166-3173

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    Facile surface improvement method for LaCoO3 for toluene oxidation

    Q. Yang, D. Wang, C. Wang, X. Li, K. Li, Y. Peng and J. Li, Catal. Sci. Technol., 2018, 8, 3166
    DOI: 10.1039/C8CY00765A

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