Novel basic catalysts with high specific surface areas have been synthesized by activation under ammonia of an aluminophosphate oxide precursor. The nitrogen content as well as the acid-base properties depend on both time and temperature of nitridation. The conversion and reaction rate in Knoevenagel condensation are related to the nitrogen content.
Massinon, A., Odriozola, J., Bastians, P., Conanec, R., Marchand, R., Laurent, Y., & Grange, P. (1996). Influence of nitrogen content on the acid-base properties of aluminophosphate oxynitrides. Applied Catalysis A: General, 137(1), 9-23. https://doi.org/10.1016/0926-860X(95)00255-3 (Original work published 1996)