Chemical Looping Selective Oxidation of H2S using V2O5 Impregnated over Different Supports as Oxygen Carriers,ChemCatChem

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Chemical Looping Selective Oxidation of H2S using V2O5 Impregnated over Different Supports as Oxygen Carriers
ChemCatChem ( IF 3.8 ) Pub Date : 2020-03-30 , DOI: 10.1002/cctc.201902031
Tanushree Kane ₁ , Jesús Guerrero Caballero ₁ , Axel Löfberg ₁

Affiliation

Chemical looping concept is proposed to improve the efficiency of selective oxidation of H₂S into elemental sulfur. V₂O₅ as an active oxygen carrier, is impregnated on different supports and exposed cyclically to reductant (H₂S) and to oxidant (O₂). Among all, TiO₂ and SiO₂ proved as better supports for V₂O₅ as they provided more formation of elemental sulfur than undesired SO₂ in the reductant step. Results indicate that the support can either directly react and provide oxygen to the process like for CeO₂ or indirectly affect the properties of the active phase, leading either into the improvement, as for TiO₂ and SiO₂, or worsening, as in case of Al₂O₃ and ZrO₂. Oxygen carriers with partially reduced species, i. e., the combination of V⁵⁺ and V⁴⁺, show better performances than carriers containing mostly highly oxidized V⁵⁺ species. Interaction between the active phase and support plays a vital role for the controls of the formation of these partially reduced species.

中文翻译：

使用浸渍在不同载体上的V2O5作为氧气载体，对H2S进行化学循环选择性氧化

提出了化学环化的概念，以提高H ₂ S选择性氧化为元素硫的效率。作为活性氧载体的V ₂ O ₅浸渍在不同的载体上，并循环暴露于还原剂（H ₂ S）和氧化剂（O ₂）。其中，TiO ₂和SiO ₂被证明是V ₂ O _5的更好载体，因为它们在还原步骤中提供了比不希望的SO ₂更多的元素硫形成。结果表明，载体可以像CeO ₂一样直接反应并向过程提供氧气或间接影响活性相的性质，导致改进，如TiO ₂和SiO ₂，或恶化，如Al ₂ O ₃和ZrO ₂。具有部分还原的物种的氧气载体，即例如，V ⁵⁺和V ⁴⁺的组合显示出比大多数包含高度氧化的V ⁵⁺物种的载体更好的性能。活性相与载体之间的相互作用对于控制这些部分还原的物种的形成起着至关重要的作用。

更新日期：2020-03-30

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