Dry citrate-precursor synthesized nanocrystalline cobalt oxide as highly active catalyst for total oxidation of propane

A set of nanocrystalline cobalt oxide (Co3O4)-based catalysts have been prepared by means of an innovative soft reactive grinding (SRG) procedure. The catalysts exhibited excellent activities and high stabilities for propane catalytic combustion. Complete conversion has been achieved at reaction temperatures as low as 240 °C. Comparing with the highly active Co3O4 catalysts in the current literature, the catalysts in this work show exceptionally high specific rate for propane total oxidation (ca. 91.3 mmolC3m−2h−1 at 200 °C). A correlation between the O2-TPD results and the activity for Co3O4 reveals that a high concentration of superficial electrophilic oxygen (O−) species is important for achieving a high activity. The prominent lattice distortion induced by prolonged citrate-precursor grinding is suggested to play a key role in creating and maintaining a high density of surface defects, which leads to highly activity and stability of the cobalt spinel catalyst.

Nanocrystalline Co3O4 prepared by soft reactive grinding exhibited excellent activity and high stability for propane combustion. Complete conversion has been achieved at reaction temperatures as low as 230 °C.Figure optionsDownload high-quality image (24 K)Download as PowerPoint slide