Elsevier B.V. Acta Medica Okayama 1566-7367 9 9 2008 CO oxidation on perovskite-type LaCoO3 synthesized using ethylene glycol and citric acid 1913 1915 EN Hideki Taguchi Satoshi Yamasaki Atsushi Itadani Masashi Yosinaga Ken Hirota In order to synthesize perovskite-type LaCoO3 with good surface crystallinity, the gel prepared by adding both ethylene glycol (EG) and citric acid (CA) to the aqueous solution of La(NO3)3 center dot 6H(2)O and Co(NO3)(2) center dot 6H(2)O was fired at 600 degrees C in air for 3 h. The transmission electron microscopy (TEM) observation indicated that the particles of LaCoO3 tended to have a uniform shape at EG/CA = 4. Although, the specific surface area of LaCoO3 synthesized using both EG and CA was slightly smaller than that of LaCoO3 synthesized using only CA, the catalytic activity of CO oxidation became higher by adding EG. No potential conflict of interest relevant to this article was reported.