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某些6—钼碲酸盐用作催化剂应用于工业上后,对碲的杂多化合物的研究引起人们的关注。大量杂多酸催化化学的研究表明,钒原子取代钨(钼)后所形成的混和杂多化合物往往具有更高的催化活性和选择性。我们在系统研究碲的杂多化合物过程中,合成出几种文献上未见报道的含钒6—钨(钼)碲(Vl)酸铵:(NH_4)_7TeW_5VO_(24)·5H_2O,(NH_4)_8TeW_4V_2O_(24)、H_2O,(NH_4)_9TeW_3V_3O_(24)·H_2O 和(NH_4)_7TeMo_5VO_(24)·8H_2O 并研究了它们的一些性质。(NH_4)_7TeW_5VO_(24)·5H_2O 的合成方法是向60℃ 0.2mol钨酸铵溶液中加入溶于20ml 水中的0.4克 H_6TeO_6溶液、以醋酸调 PH 至3.5,回流3小时。然后加入溶于
After some 6 molybdenum tellurite is used as a catalyst in industrial applications, the research of tellurium heteropoly compounds has aroused people’s attention. A large number of heteropolyacid catalytic chemistry studies have shown that vanadium atoms replaced by tungsten (molybdenum) after the formation of hybrid heteropoly compounds tend to have higher catalytic activity and selectivity. In the systematic study of the heteropoly compounds of tellurium, several kinds of ammonium vanadium 6-tungsten (molybdenum) tellurium (Vl) ammonium compounds were synthesized and reported in the literature: (NH_4) _7TeW_5VO_ (24) · 5H_2O, (NH_4) (24), H_2O, (NH_4) _9TeW_3V_3O_ (24) · H_2O and (NH_4) _7TeMo_5VO_ (24) · 8H_2O were synthesized and their properties were studied. (NH_4) _7TeW_5VO_ (24) · 5H_2O is synthesized by adding 0.4 g of H_6TeO_6 solution dissolved in 20 ml of water to a solution of 0.2 mol of ammonium tungstate at 60 ° C, adjusting the pH to 3.5 with acetic acid and refluxing for 3 hours. Then add dissolved