Selective oxidation of toluene to benzaldehyde in liquid phase over CoAl oxides prepared from hydrotalcite-like precursors Weiyou Zhou · Ke Huang · Mingming Cao · Fu’an Sun · Mingyang He · Zaixin Chen Techniques Powder X-ray diffraction (XRD) patterns of the as-synthesized samples were obtained using a Rigaku D/max 2500 PC X-ray diffractometers with Cu-Kα (1.5402 Å) radiation at 10 min−1. For the scanning electron microscopy (SEM) study of the samples, a JEOL JSM-6360LA scanning electron microscope was used. The compositions of samples were analyzed by inductively coupled plasma analysis (ICP) using a Varian Vista-AX device. The specific surface areas of samples were determined by the BET method using a micromeritics ASAP2010C apparatus, and the gas adsorbed at ‒196 C was pure nitrogen. Fig. 1S SEM images of Co4Al-LDH (A) and Co4Al oxide (B) Table 1S ICP and BET analysis of CoAl oxides with different ratios Mole ratio of Co/Al Samples Co content Surface area (wt%) (m2g-1) 1.73 43.3 66 3.0 2.49 44.1 67 4.0 3.06 45.2 61 Theoretical Experimental Co2Al oxide 2.0 Co3Al oxide Co4Al oxide Intensity, a.u. Co4Al oxide Co4Al-LDH 10 20 30 40 50 60 70 2θ, degree Fig. S2 XRD patterns of Co4Al-LDH and Co4Al oxide after reused