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The pre-reduction of the industrially relevant CrVI/SiO2 Phillips catalyst by cyclohexene at room temperature was investigated by means of operando XANES, Diffuse Reflectance UV–Vis and transmission FT-IR spectroscopies. It was found that cyclohexene efficiently reduces the surface chromates sites (CrVI) at room temperature to give mainly divalent chromium sites and aldehyde by-products, which are...
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