Low temperature CO oxidation catalysed by flower-like Ni–Co–O: how physicochemical properties influence catalytic performance

• DOI: 10.1039/c7ra12635b
• Publication Date: 2018-02-12T15:34:27Z
• Authors: Yunan Yi; Pan Zhang; Zuzeng Qin; Chuxuan Yu; Wei Li; Qiuju Qin; Bin Li; Minguang Fan; Xin Liang; Lihui Dong
• Keywords: Non-blocking I/O; Physisorption; Coprecipitation

In this work, mesoporous Ni-Co composite oxides were synthesized by a facile liquid-precipitation method without the addition of surfactant, and their ability to catalyse low temperature CO oxidation reaction was investigated. To explore effect synergetic interaction between Ni Co on physicochemical properties catalytic performance these catalysts, as-prepared samples characterized using XRF, XRD, LRS, N2-physisorption (BET), SEM, TEM, XPS, H2-TPR, O2-TPD in situ DRIFTS characterization techniques. The results are as follows: (1) doping cobalt can reduces size NiO, thus massive amorphous NiO have formed highly dispersed catalyst surface, resulting formation abundant surface Ni2+ ions; (2) ions partially substitute Co3+ form spinel solid solution, generating an abundance oxygen vacancies, which vital for oxidation; (3) Ni0.8Co0.2 exhibits highest activity satisfactory stability oxidation, whereas larger content decrease activity, suggesting that phase is dominant active instead Co3O4 (4) introduction alter morphology from plate-like flower-like then dense granules. This morphological variation related textural catalysts. Lastly, possible mechanism tentatively proposed.