In situ FT-IR microscopic investigation of metal substituted AlPO4-5 single crystals
References (10)
- et al.
Zeolites
(1990) - et al.
Atlas of Zeolite Structure Types
(1992) - et al.
Stud. Surf. Sci. Catal.
(1991) - et al.
Bull. Soc. Chim. Belg.
(1990) - J. Kornatowski, M. Rozwadowski and G. Finger, Pol. Pat. PL 166 505,...
Cited by (21)
On the role of Zr to facilitate the synthesis of diesel and jet fuel range intermediates from biomass-derived carbonyl compounds over aluminum phosphate
2023, Applied Catalysis B: EnvironmentalCitation Excerpt :For the ZrAPOs, these peaks were shifted to higher binding energy (182.5 and 184.9 eV) implying the incorporation of tetrahedrally coordinated Zr atoms into the framework.[44,45] Additionally, in FT-IR spectra of the catalysts a shift of the Al-O-P band from 1108 cm-1 (APO-5) to 1074 cm-1 (ZrAPO(0.20)) (Fig. 3b) indicated the replacement of Al or P for Zr,[46] Furthermore, a new peak at around 3668 cm-1 assigned to terminal P-OH groups [47–49] appeared after the incorporation of Zr, which was also in line with results obtained by 27Al and 31P solid-state MAS NMR spectroscopy (Fig. S6), where a broad peak belonging to P-OH defect groups [47,50] was formed after the introduction of Zr with a positive area relationship to the metal content. Moreover, the Al/P molar ratio increased with increasing Zr loading (Table 1) indicating loss of P atoms during the substitution probably due to the replacement of P by Zr atoms in framework sites.
Acidity effect on benzene methylation kinetics over substituted H-MeAlPO-5 catalysts
2021, Journal of CatalysisCitation Excerpt :Other aluminophosphates, such as AlPO-5 with the AFI topology, formed by large one-dimensional 12-ring channels of 7.3 Å diameter, allow for a faster diffusion of reaction products and, therefore, limit secondary reactions [31]. The isomorphous substitution of the Al or P atoms in these materials by Me2+ or Me4+ species, respectively, were reported to provide structures with stable Brønsted acid sites using heteroatoms as Si, Co, Zn, Zr or Mg [31–36]. H-SAPO-5 is especially interesting because it presents a similar acidity to those of the commercial H-SAPO-34 catalysts for the MTO process and because its channels have a similar size as the cavities of H-SAPO-34 [37].
Rational design of bifunctional hierarchical Pd/SAPO-5 for the synthesis of tetrahydrofuran derivatives from furfural
2021, Journal of CatalysisCitation Excerpt :Briefly, the FTIR spectra are constituted by two main bands, one at 3680 cm−1 that can be assigned to the O-H stretching mode of free P-OH defects, and a pronounced band at 3745 cm−1 that can be attributed to Si-OH groups, pointing out the presence of defects in the AFI framework upon incorporation of Si. The FTIR spectra in the OH stretching region of HPSAPO-5/xSi display two distinctive bands centered at 3630 and 3513 cm−1 (Fig. S15A), which can be associated to Al(OH)Si Brønsted acid sites located in the 12-ring and 6-ring channels of the AFI framework [54,78-80]. Additional signals arising from isolated SiOH (3745 cm−1) and isolated POH (3678 cm−1) sites are also visible, pointing out the presence of defects in the AFI framework upon incorporation of Si.
Influence of Na, P and (Na + P) poisoning on a model copper-ferrierite NH<inf>3</inf>-SCR catalyst
2019, Applied Catalysis B: EnvironmentalCitation Excerpt :On the contrary, no significant change was observed in the OH stretching region of Cu-FER@(750 P), with the exception of a slight shoulder at 3670 cm-1. Note that stretching vibration of terminal POH groups are observed around 3672−3666 cm-1 over AlPO4 and SAPO materials [31]. It induces that Brønsted acidity could be slightly modified over the P-containing sample.
Diffraction and Spectroscopy of Porous Solids
2013, Comprehensive Inorganic Chemistry II (Second Edition): From Elements to ApplicationsOn stability and performance of highly c-oriented columnar AlPO <inf>4</inf>-5 and CoAPO-5 membranes
2012, Microporous and Mesoporous MaterialsCitation Excerpt :FTIR spectra in Fig. 10 emphasize amine decomposition following RTP. In Fig. 10a, the representative spectrum of an as-synthesized AlPO4-5 membrane on porous α-Al2O3 shows the lattice framework vibrations along with triethylamine SDA peaks, which may be observed in the 1400–1500 and 2800–3000 cm−1 regions [37]. As can be seen from Fig. 10b, based on the absence of the aforementioned SDA region peaks, RTP with a maximum holding temperature of 400 °C decomposed the occluded amine molecules prior to significant structure alteration (Fig. 9b).