New Nb-P-Si ternary oxide materials and their use in heterogeneous acid catalysis
The surface and catalytic properties of oxide ternary materials consisting of niobium-
phosphorus-silicon, Nb-P-Si, with Nb/P= 1 and general formula xNb 2 O 5· xP 2 O 5·(100–
2x)· SiO 2, with x= 2.5, 5, 7.5, and 10, and Si content ranging from 95 to 80 mol% are
presented. Amorphous gel-derived samples were obtained, characterized by a very high
degree of silicon cross-linking with presence of Sisingle bondOsingle bondNb bridges,
allowing phosphorus to be stably anchored to the matrix through Nbsingle bondOsingle …
phosphorus-silicon, Nb-P-Si, with Nb/P= 1 and general formula xNb 2 O 5· xP 2 O 5·(100–
2x)· SiO 2, with x= 2.5, 5, 7.5, and 10, and Si content ranging from 95 to 80 mol% are
presented. Amorphous gel-derived samples were obtained, characterized by a very high
degree of silicon cross-linking with presence of Sisingle bondOsingle bondNb bridges,
allowing phosphorus to be stably anchored to the matrix through Nbsingle bondOsingle …