本文报导了Pd-V_2O_5-X-SiO_2体系催化剂的电子自旋共振(以下简称ESR.)谱,当固定V_2O_5含量时,在一定的钯含量范围内,乙醛收率和V~(4+)浓度成线性关系,但随着钯含量增高,V~(4+) 浓度继续增加而乙醛收率不再增加。为此,我们认为V~(4+)离子应有两种:Va~(4+)和Vb~(4+),其中只有Va~(4+)是有催化活性的,并且对它的催化反应模式提出了初步的设想。 In this paper, the electron spin resonance (hereinafter referred to as ESR.) Spectrum of Pd-V 2 O 5 -X-SiO 2 catalyst was reported. When the content of V 2 O 5 was fixed, the yield of acetaldehyde and V 4+ However, with the increase of palladium content, the concentration of V ~ (4 +) continued to increase while the yield of acetaldehyde did not increase any more. For this reason, we think there are two kinds of V ~ (4+) ions: Va ~ (4+) and Vb ~ (4+), of which only Va ~ (4+) is catalytically active and its catalytic The reaction mode proposed the initial idea.