A series of graphitic carbon nitrides (g-C₃N₄) were prepared using different precursors; these g-C₃N₄-supported CoOx catalysts exhibited different catalytic performances in toluene catalytic combustion reaction. The structure of samples was detected by XRD, TEM, SEM, XPS, H₂-TPR, nitrogen adsorption and desorption technique, to build up the structure–performance relationship and uncover the key property of g-C₃N₄ that mostly influences the catalytic performance of CoOx/g-C₃N₄. CoOx with average particle size of 12.7 nm supported on g-C₃N₄ prepared by dicyandiamide showed better catalytic performance than on other supports, 100% toluene conversion could be achieved at ~ 285 °C, characterization results showed that Co was directly connected with N, and the integrity of g-C₃N₄ sheet affects the dispersion of CoOx; the content of sp²-N (within C=N–C structure) determines the interaction between g-C₃N₄ and CoOx; these two factors together affect the performance of CoOx/g-C₃N₄ catalysts in the catalytic combustion of toluene.

中文翻译：

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gC 3 N 4纳米结构对CoOx / gC 3 N 4在甲苯催化燃烧中催化性能的影响

使用不同的前驱体制备了一系列石墨碳氮化物（gC ₃ N ₄）。这些由gC ₃ N ₄负载的CoOx催化剂在甲苯催化燃烧反应中表现出不同的催化性能。通过XRD，TEM，SEM，XPS，H ₂ -TPR，氮吸附和解吸技术检测样品的结构，以建立结构-性能关系并揭示主要影响催化性能的gC ₃ N ₄的关键性能。的CoOx / gC ₃ N ₄。在gC ₃ N ₄上负载的平均粒径为12.7 nm的CoOx由双氰胺制备的催化剂具有比其他载体更好的催化性能，在〜285°C时甲苯的转化率可达到100％，表征结果表明Co与N直接相连，gC ₃ N ₄片的完整性影响CoOx的分散性; sp ² -N的含量（在C = NC结构内）决定了gC ₃ N ₄与CoOx之间的相互作用。这两个因素共同影响CoOx / gC ₃ N ₄催化剂在甲苯催化燃烧中的性能。