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采用室温固相反应法合成出H3 CoPMo1 0 V2 O40 ·7H2 O纳米催化剂,用元素分析、IR、XRD、TEM等手段确定其组成、结构和性能,同时考察了其用于苯 过氧化氢直接羟化合成苯酚反应的催化活性和机理。结果表明,产物仍保持杂多阴离子的Keggin结构,晶粒尺寸约为3 4nm ,比表面积为1 3 6m2 ·g-1 ,在催化苯羟基化的反应中,活性中心是钒的过氧化物,苯酚收率>5 0 %,选择性>98%。
The composition, structure and properties of H3 CoPMo1 0 V2 O40 · 7H2 O nanocatalyst were synthesized by solid-state reaction at room temperature. The composition, structure and properties of the catalysts were investigated by elemental analysis, IR, XRD and TEM. Catalytic activity and mechanism of the synthesis of phenol. The results show that the product still retains the heteropolyanion Keggin structure, the grain size of about 34nm, the specific surface area of ?? 136m2 · g-1, in the catalytic benzene hydroxylation reaction, the active center is a vanadium peroxide, Phenol yield> 50%, selectivity> 98%.