Vanadium modified AlPO-5 spheres through resin macrotemplating

Naydenov, Valeri; Tosheva, Lubomira; Sterte, Johan

doi:10.1016/j.micromeso.2003.08.020

Cited by 31 publications

(25 citation statements)

References 29 publications

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“…These large particles have generally been prepared in a two-step process involving the use of preformed spherical particles as sacrificial templates, which were thermally or chemically removed following the completion of chemical reactions instigated within the templates. Millimetre-sized (zeolitic [19][20][21] and metal oxides: 22 Fe 2 O 3 , Al 2 O 3 and TiO 2 ) spheres have been made using ionic polymeric resin beads as templates. Zhang and co-workers 23,24 prepared a range of single and mixed metal oxide beads using polyacrylamide beads initially prepared through an oil-in-waterin-oil sedimentation polymerization.…”

Section: Introductionmentioning

confidence: 99%

Sol–gel synthesis of hierarchically porous TiO2 beads using calcium alginate beads as sacrificial templates

Kimling

Caruso

2012

J. Mater. Chem.

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Section: Introductionmentioning

confidence: 99%

Sol–gel synthesis of hierarchically porous TiO2 beads using calcium alginate beads as sacrificial templates

Kimling

Caruso

2012

J. Mater. Chem.

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“…Stein et al reported firstly the synthesis of macroporous silicalite-I zeolites by using arrays of monodisperse polystyrene spheres as templates. 7 Based on the similar route, many other macroporous-forming templates have been used, including latex-beads, 8 resins beads, [9][10][11] polyurethane foam, 12 ceramic foams, 13,14 starch gel, 15 wood cells, 16 kaolin, 17 silica spheres, 18 diatom, 19 Equisetum arvense. 20 Though these methods may allow tuning of the texture properties of the resulting materials by changing the nature of the template and the synthesis conditions, and yet the synthetic procedure is relatively complex and the mechanical stability of resulted macroporous materials is restricted due to the weak interaction between the zeolite nanocrystals and the wall of templates, which inevitably limits their practical applications.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and catalytic performances of hierarchical SAPO-34 monolith

et al. 2010

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A novel hierarchical SAPO-34 monolith was prepared by the dry gel conversion of the amorphous silicoaluminophosphate monolith. The obtained material possesses macropores and mesopores besides micropores. The macroporous framework of the hierarchical SAPO-34 is constructed by interconnected spherical aggregates of cubic SAPO-34 crystals and mesopores is formed by the close stacking of cubic SAPO-34 crystals. Catalytic tests show that the hierarchical SAPO-34 possesses high catalytic activity compared with the conventional microporous SAPO-34 for methanol conversion to light olefins (MTO) reaction. The better activity is mainly assigned to the existence of cubic SAPO-34 crystals and the hierarchical porosity.

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“…4 shows the Raman spectra of the calcined FeAlPO 4 -5, AlPO 4 -5 and Fe 2 O 3 /AlPO 4 -5 samples at a wavelength of 244 nm which is within the range of the charge-transfer bands at 260 nm. The AlPO 4 -5 sample has its characteristic peak at 260 400, 500, 1140, 1240 cm −1 as a typical AFI structure [28,29]. The intensity of the peak around 260 cm −1 is very small, but in the Fe 2 O 3 /AlPO 4 -5 sample, the presence of the peak at 260 cm −1 is instead more obvious and recognizable.…”

Section: Resultsmentioning

confidence: 98%

The state of iron sites in the calcined FeAlPO4-5 and its tuning to the property of microporous AlPO4-5 molecular sieve

Feng

Zhu

et al. 2016

Catalysis Today

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Please cite this article in press as: B. Feng, et al., The state of iron sites in the calcined FeAlPO 4 -5 and its tuning to the property of microporous AlPO 4 -5 molecular sieve, Catal. Today (2015), http://dx. a b s t r a c tThe dispersion and coordination is critical to the nature of metal phases. This article describes an approach of single Fe sites preparing under microporous environment via calcination of the Fe incorporated FeAlPO 4 -5 as well as the tuning to the property of AlPO 4 -5 molecular sieve. The UV, Raman, EPR spectroscopies and H 2 -TPR characterization revealed through the extraction of framework Fe inside the micropore by calcination, extra-framework Fe sites were generated, the dispersion of which was higher than Fe sites of impregnated Fe 2 O 3 /AlPO 4 -5, and it indicated that part of Fe sites of FeAlPO 4 -5 can be with coordination vacancy. It is notable that the presence of single Fe sites was directly observed by Cs-corrected STEM micrograph. NH 3 -TPD and toluene-TPD results both exhibited an enhanced acidity and bond adsorption ability of FeAlPO 4 -5 toward AlPO 4 -5 and the impregnated sample Fe 2 O 3 /AlPO 4 -5. Finally, the FeAlPO 4 -5 turned out to perform higher thiophene desulfurization rate against AlPO 4 -5 and impregnated sample, which can be related to the improvement in the adsorption ability and reactivity for the single Fe sites inside the microporous environment.

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Vanadium modified AlPO-5 spheres through resin macrotemplating

Cited by 31 publications

References 29 publications

Sol–gel synthesis of hierarchically porous TiO2 beads using calcium alginate beads as sacrificial templates

Sol–gel synthesis of hierarchically porous TiO2 beads using calcium alginate beads as sacrificial templates

Synthesis and catalytic performances of hierarchical SAPO-34 monolith

The state of iron sites in the calcined FeAlPO4-5 and its tuning to the property of microporous AlPO4-5 molecular sieve

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