SAPOs DRIFT

Sinha et al. [281] investigated the framework vibrations of silicoalumino-phosphate SAPO-39 and of magnesium aluminophosphate MAPO-39 by DRIFT spectroscopy and interpreted them according to the approach of Flanigen et al. [112]. The OH stretching region was studied by FTIR transmission spectroscopy (vide infra. Sect. 5.4.1). 

Characterization of the OH stretching region by DRIFT spectroscopy besides TPD measurements was reported by Chen et al. [535] for a series of SAPOs (SAPO-5, SAPO-17, SAPO-18 and SAPO-34), prepared by these authors. Besides... 

Diffuse reflectance IR spectroscopy (DRIFT) was, furthermore, successfully employed in studying molecular sieves of the new generation [957] such as aluminophosphates (AlPOs) and silicoaluminophosphates (SAPOs). Thus, Zscherpel et al. and Loeffler et al. [563,564] studied by DRIFT the range of fundamental OH stretching, OH deformation and framework vibrations of AIPO4-18 (upon decomposition of the template, tetraethylanunonium hydroxide), the fundamental and combination vibrations of hydroxy groups of SAPO-5 and SAPO-17 as well as the framework region of SAPO-34. In the latter case a comparison was made with the transmission spectrum. 

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