DRIFTS study of the surface structure and nitridation process of mixed galloaluminophosphate oxynitride (AlGaPON) catalysts

被引:18
作者
Centeno, MA [1 ]
Delsarte, S [1 ]
Grange, P [1 ]
机构
[1] Univ Catholique Louvain, Unite Catalyse & Chim Mat Divises, B-1348 Louvain, Belgium
来源
JOURNAL OF PHYSICAL CHEMISTRY B | 1999年 / 103卷 / 34期
关键词
D O I
10.1021/jp990699z
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The spectra of high surface area amorphous oxide AlPO, AlGaPO, and GaPO were compared with those of high surface amorphous oxynitrides AlPON and AlGaPON with similar O/N ratio and with that of the nitride GaN. This allowed us to make a correct assignation of the bands in their IR vibrational spectra, especially those in the new family of solids named galloaluminophosphate oxynitride, AlGaPON. The substitution of aluminum atoms by gallium induces a shift of the framework band vibrations due to a second-neighbor effect. The introduction of nitrogen in the network of the oxide phosphate produces a broadening and poor definition of the structural bands due to a collapse of the structure. NH4+, coordinated NH3, -NH2, and -NH- species are identified on the surface of the AlGaPON solid. A thermal treatment under NH3 allows us to propose the following nitridation sequence: M-O-NH4+ and/or M-NH3 --> M-NH2 --> M-NH-M --> N3-.
引用
收藏
页码:7214 / 7221
页数:8
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