Solid Method Influence Tungsten Trioxide Structure (2)

Solid-phase method is blending a proportion of metal salt or metal oxide, calcined after grinding. According to studies, calcined APT under different conditions will obtain different structure tungsten trioxide. Using ammonium tungstate (NH4) 2WO4 as raw materials producing tungsten trioxide by solid phase out method the reaction condition different the WO3 structure is different. A certain amount of (NH4) 2WO4 calcined for 3 hours at 600 ℃ condition, and cooled to obtain WO3 powders which is monoclinic and triclinic two crystal phases. Or using (NH4) 2WO4 as the raw material by calcination, low temperature hardening and calcination, nature cooling method for preparing monoclinic phase and quadrature phase of WO3 respectively. Found that higher activity quadrature phase WO3 than monoclinic WO3. While changing the calcination temperature to 700 ℃ to resolve (NH4) 2WO4 producing WO3 catalyst. After studies theWO3 catalyst in electron acceptor Fe3 + solution system photocatalytic activity found that the increasing of Ar content, the WO3 catalyst surface oxygen vacancies increase, catalytic oxygen evolution increases. And in pure Ar conditions it has been the most active WO3 catalyst.

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