Influence of nitrogen content of a new aluminophosphate oxynitride catalyst: A1PON in Knoevenagel condensation

Porous Silicon Nitride Materials as Basic Catalysts

“…Other research groups confirmed the suitability of zeolite catalysts with the MFI structure, such as silicalite-1 [3], BZSM-5 [4] or titanium silicalite-1 [5], for the rearrangement of cyclohexanone oxime. There is general agreement that the amount of heteroatoms (Al, B, Ti) isomorphously substituted in the zeolite framework and the textural properties of the zeolite, e.g., its crystallite size and crystallinity, are of major importance.…”

“…For example, the reaction of silicon dioxide with ammonia at 1000 C results in the formation of silicon oxynitride (Si 2 N 2 O) [2,3]. The treatment of amorphous aluminophosphates with ammonia leads to basic catalysts, which can be described as aluminophosphate oxynitrides [4,5].…”

Para-selectivity of modified HZSM-5 zeolites by nitridation for ethylation of ethylbenzene with ethanol

“…Recently, nitridation was reported as a method for introducing basic sites into zeolites, and the nitridized zeolites can maintain the specific areas as well as good crystallinity of precursors [16][17][18][19]. However, the basicity of nitrogen-incorporated zeolites is less strong than that of nitridized amorphous phase because it is quite difficult for zeolites to react with ammonia due to their crystallinity and instability of framework [20].…”

Structural Investigation of Mixed Nitrided Galloaluminophosphates “AlGaPON” by EELS, XAS, and XPS Spectroscopies

“…The considerable changes induced by this treatment on the phosphates acid}base properties were "rst demonstrated on two families of amorphous catalysts: the nitrided zirconophosphates &&ZrPON'' (7}10) and the nitrided aluminophosphates &&AlPON'' (11,12). More recently, we developed a new family of mixed nitrided galloaluminophosphates &&AlGaPON''.…”