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The sol-gel processing method was used as an alternative route to obtain Nb 2 O 5 phase homogenously dispersed in the SiO 2 matrix, improving the thermal stability of the Bronsted acid sites, Nb-OH and Nb-OH-Si groups. The local niobium structure and the influence of the amount of niobia on the surface of the Nb 2 O 5 /SiO 2 system were studied by XAS...
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