Current stringent environmental regulations oblige to treat hydrogen sulphide (H₂S) emissions originated in petroleum refineries and gas plants. Claus and Super Claus processes are the most common used, but due to thermodynamic limitations a relevant percentage of H₂S is not converted to sulphur in the Claus process, and high concentration of H₂S (2% vol) cannot be treated with the Super Claus technology. Vanadium oxide catalysts supported on mesoporous materials, based on a surfactant expanded zirconium phosphate with silica galleries into the interlayer space, named porous phosphate heterostructure (PPH), were prepared by using TEOS and vanadium oxitripropoxide in n-propanol as sources of Si and V, respectively; with different Si/V molar ratios of 1, 2, 5 and 25; and calcining at 550 ºC for 6 hours. Using this method, vanadium is incorporated to the structure of the gallery, but the surface area strongly decreases with the increase of the vanadium content. The solids obtained were denoted V-yPPH, where y is the Si/V molar ratio added. The catalysts were characterised before and after catalysis by XRD, XPS, TEM, FT-IR and Raman, and tested in the selective catalytic reduction of H₂S using a fixed bed reactor, at atmospheric pressure, at 180-260 ºC. The catalysts with high contents of vanadium, samples V-1PPH and V-2PPH are very active at 200 ºC, showing H₂S conversions of 85-99%, with a high selectivity to elemental sulphur and with a low formation of SO₂.

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