Co-templating and modelling in the rational synthesis of zeolitic solids

Castro, María; García, Raquel; Warrender, Stewart J.; Slawin, Alexandra M. Z.; Wright, Paul A.; Cox, Paul A.; Fécant, Antoine; Mellot‐Draznieks, Caroline; Bats, Nicolas

doi:10.1039/b705377k

Cited by 63 publications

(75 citation statements)

References 13 publications

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“…Powder X-ray diffraction patterns of the as-synthesized samples ( Fig. 1) are in good agreement with simulated patterns of framework types LTA (aluminosilicate, zeolite A), SAV (magnesium aluminophosphate, Mg-STA-7) and LEV (aluminosilicate, zeolite levynite) 43 and previously reported patterns of SAPO-42 44 STA-7 42 and SAPO-35. 40 These results confirm that it is possible to obtain, SAPO-35 and STA-7 and SAPO-42 as pure crystalline phases using gel compositions within a wide range of Si/Al ratio.…”

Section: Resultssupporting

confidence: 70%

“…• STA-7 was prepared adapting the experimental procedure followed by M. Castro et al 42 Gels with molar composition 1 Al2O3 : 0.75 P2O5 : x SiO2 : 0.25 TEAOH : 0.125 Cyclam : 55 H2O were prepared using H3PO4 (Sigma-Aldrich, 85%), Al(OH)3 (Sigma-Aldrich) and SiO2 (Aerosil 200, Degussa) as sources of the framework elements. 1,4,8,11-tetraazacyclotetradecane (cyclam, Sigma-Aldrich, 98%) and tetraethylammonium hydroxide (TEAOH, Sigma-Aldrich, 35% aqueous solution) were used as structure directing agents, acting in the synthesis as cotemplates.…”

Section: Synthesis Of Sapo Molecular Sievesmentioning

confidence: 99%

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Complex relationship between SAPO framework topology, content and distribution of Si and catalytic behaviour in the MTO reaction

Pinilla-Herrero

Márquez‐Álvarez

Sastre

2017

Catal. Sci. Technol.

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Three small-pore silicoaluminophosphates containing relatively large cavities in their structure (LEV, LTA and SAV) have been hydrothermally synthesized with various silicon concentrations. The effect of the silicon content and distribution on both the physicochemical and the catalytic properties of the SAPO molecular sieves was studied. Remarkable differences in the Si incorporation were found, showing that the topological features and the structure directing agent employed in each case play an important role, controlling not just the Si location in the framework, but also the amount of Si incorporated. In all the cases, the formation of Si islands, associated to stronger acid sites, was favoured by the use of higher concentrations of the Si source in the synthesis gel. However, it has been found that framework topology can have greater influence than acidity on the catalytic behaviour of SAPO materials in the MTO transformation.

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Section: Resultssupporting

confidence: 70%

Section: Synthesis Of Sapo Molecular Sievesmentioning

confidence: 99%

Complex relationship between SAPO framework topology, content and distribution of Si and catalytic behaviour in the MTO reaction

Pinilla-Herrero

Márquez‐Álvarez

Sastre

2017

Catal. Sci. Technol.

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“…4 (24 h). 31 P MAS NMR spectrum gave a peak at À28.7 ppm corresponding to P(OAl) 4 resonance [28]. In the 29 Si MAS NMR spectrum, only one resonance peak was observed at À92.3 ppm that could be assigned to Si(4Al) environment [29].…”

Section: Mas Nmr Spectramentioning

confidence: 99%

“…However, rational design of novel materials with targeted properties (structure, composition, morphology, etc.) still remains a challenge, although some evident progress has been made by several research teams [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%