The role of vanadium species during SO₂ removal over a V₂O₅/AC catalyst was studied in detail using in situ diffuse reflectance infrared Fourier transform spectroscopy, Raman spectroscopy, temperature programmed desorption, X-ray photoelectron spectroscopy and N₂ adsorption. Results revealed that V₂O₅ reacted with SO₂ to form a stable vanadium(V) sulfate of V₂O₃(SO₄)₂. However, V₂O₃(SO₄)₂ did not deactivate the catalyst and was catalytically active towards SO₂ oxidation, leading to the formation of H₂SO₄. Thus, the sulfur capacity of the V₂O₅/AC catalyst was determined by formation of V₂O₃(SO₄)₂ and H₂SO₄. Increasing V₂O₅ loading enhanced the formation of V₂O₃(SO₄)₂ but inhibited that of H₂SO₄ because V₂O₃(SO₄)₂ occupied the pores for H₂SO₄ storage.

中文翻译：

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钒物种在V ₂ O ₅ / AC催化剂上 去除SO ₂的作用

利用原位漫反射红外傅里叶变换光谱，拉曼光谱，程序升温解吸，X射线光电子能谱和N ₂吸附，详细研究了钒物种在V ₂ O ₅ / AC催化剂上去除SO ₂的作用。结果表明，V ₂ O ₅与SO ₂反应形成稳定的V ₂ O ₃（SO ₄）₂硫酸钒（V）。但是，V ₂ O ₃（SO ₄）₂不会使催化剂失活，并且对SO ₂氧化具有催化活性，导致形成H ₂ SO ₄。因此，通过形成V ₂ O ₃（SO ₄）₂和H ₂ SO ₄来确定V ₂ O ₅ / AC催化剂的硫容量。V ₂ O ₅负载的增加促进了V ₂ O ₃（SO ₄）₂的形成，但抑制了H ₂ SO _{4的形成，}因为V ₂ O₃（SO ₄） ₂占据了用于H ₂ SO ₄储存的孔。