Impact of Mn addition on catalytic performance of Cu/SiBEA materials in total oxidation of aromatic volatile organic compounds

Dealuminated BEA zeolite (SiBEA) was chosen as a support of metal oxide(s) phase for catalytic combustion volatile organic compounds (VOCs). Copper and/or manganese were deposited at various Cu/Mn molar ratios. Factors influencing the activity found by physicochemical methods, including XRD, XRF, low-temperature N2 adsorption, FT-IR, UV–Vis-DRS, STEM-EDX, XPS and H2-TPR. Depending on chemical composition, CuO, (CuxMn3-x)1-δO4, Cu-doped Mn3O4 or Mn2O3 formed dominant phase. The active particles located mainly in interparticle voids support. SiBEA gained Lewis acid sites after introduction oxide phase, especially case CuO deposition. presence copper system resulted enhanced reducibility consequence high total oxidation aromatic VOCs, which proceeds according to Mars-van Krevelen mechanism. After Mn, co-existence different valence forms due redox equilibrium: Cu2+ + Mn3+ = Cu+ Mn4+. Definitely, addition Mn Cu/SiBEA increased number available surface vacancies had beneficial effect performance.