Cyclohexane oxidation over AFI molecular sieves: effects of Cr, Co incorporation and crystal size

Liu, Decheng; Zhang, Baoquan; Liu, Xiufeng; Li, Jian

doi:10.1039/c5cy00416k

Cited by 17 publications

(8 citation statements)

References 42 publications

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“…As a typical example, the continuous SAPO-5 membranes could be fabricated via the in situ crystallization method, but the AlPO 4 -5 analogues could not, until now. On the other hand, the isomorphous substitution of framework atoms by transitional metals could provide redox active sites on molecular sieves for heterogeneous catalysis [ 43 ]. MnAPSO-5 crystals possessed almost the same morphology and size as SAPO-5 ( Figure 4 ).…”

Section: Resultsmentioning

confidence: 99%

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Efficient Manipulation of Continuous AFI-Type Aluminophosphate Membranes with Distinctive Microstructures on Macroporous α-Al2O3 Substrates

et al. 2018

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The availability of continuous and well-defined AFI-type aluminophosphate membranes (AFI membranes) would trigger their applications in innovative materials. A well-designed manipulation strategy is proposed to produce continuous AFI membranes with four different microstructures over porous α-Al2O3 substrates. A double-layer and highly c-oriented AFI membrane of hexagonal prisms is obtained when a thin layer of medium molecular weight (MMW) chitosan is employed as the structure-directing matrix together with aluminum isopropoxide (AIP) as the Al source. It can be transformed to a single-layer and highly c-oriented AFI membrane of hexagonal prisms if the structure-directing matrix is replaced by a thin layer of low molecular weight (LMW) chitosan. When the Al source is changed to pseudo-boehmite, the single-layer AFI membrane is composed of highly ordered spherical agglomerates of small crystals. Furthermore, the membrane will turn to the double-layer AFI membrane of highly-ordered crystal agglomerates if a thin layer of MMW chitosan is used once again, keeping pseudo-boehmite as the Al source. The manipulation methodology established here is rather reliable with a pretty high reproducibility.

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Section: Resultsmentioning

confidence: 99%

“…As aforementioned, a number of transitional metal ions could be incorporated into the framework of AFI molecular sieves for various potential applications [ 43 , 45 ]. Several metallic elements such as Cr, Co, Fe, and Mn were added into the reaction systems to synthesize MeAPSO-5 membranes in this study.…”

Section: Resultsmentioning

confidence: 99%

Efficient Manipulation of Continuous AFI-Type Aluminophosphate Membranes with Distinctive Microstructures on Macroporous α-Al2O3 Substrates

et al. 2018

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“…[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][48][49] appeared after the incorporation of Zr, which was also in line with results obtained by 27 Al and 31 P 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.…”

Section: Structure Of Catalystsmentioning

confidence: 91%

On the role of Zr to facilitate the synthesis of diesel and jet fuel range intermediates from biomass-derived carbonyl compounds over aluminum phosphate

Fang

Liu

Schill

et al. 2023

Applied Catalysis B: Environmental

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“…One member of this family, AlPO4-5 [4] (AFI-framework type [5]) has become the object of increasing interest thanks to its potential technological and industrial applications [6,7,8]. AFIframework is characterized by a monodimensional channel system defined by 12-membered tetrahedral rings (12MR) (Figure 1), suitable for hosting organic molecules and polymers.…”

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confidence: 99%

Dehydration mechanism of AlPO4-5: A high-resolution synchrotron X-ray powder diffraction study

Polisi

Arletti

Quartieri

et al. 2018

Microporous and Mesoporous Materials

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We present the results of a study on the thermal stability and dehydration dynamics of the porous aluminophosphate AlPO4-5, from room temperature to 850 °C, carried out by in situ synchrotron X-ray powder diffraction experiments. No phase transitions were observed in the investigated T range. Due to the very low interactions among framework and water molecules, dehydration is already complete at 152 °C. It occurs in two main T ranges, one between 60 and 80 °C and the second one between 90 and 120 °C. During these two stages, the cell volume tends to increase to facilitate the water release. Overall, across the full explored T range, the cell volume increase is only 0.84%, indicating that AlPO4-5 is one of the most rigid zeolite frameworks studied to date. Specifically, after complete dehydration at 200 °C, AlPO4-5 undergoes a negative thermal expansion as a consequence of the decrease in both a and c cell parameters. The expansion coefficients for V, a and c cell parameters, in the 152-850 °C range, are αV =-7.12 (10-6/K), αa=-2.5 (10-6/K), αc=-2.2 (10-6/K), respectively.

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Cyclohexane oxidation over AFI molecular sieves: effects of Cr, Co incorporation and crystal size

Abstract: An ultra-thin AFI catalyst doped with Cr and Co exhibits enhanced activity in the oxidation of cyclohexane under mild conditions.

Cited by 17 publications

References 42 publications

Efficient Manipulation of Continuous AFI-Type Aluminophosphate Membranes with Distinctive Microstructures on Macroporous α-Al2O3 Substrates

Efficient Manipulation of Continuous AFI-Type Aluminophosphate Membranes with Distinctive Microstructures on Macroporous α-Al2O3 Substrates

On the role of Zr to facilitate the synthesis of diesel and jet fuel range intermediates from biomass-derived carbonyl compounds over aluminum phosphate

Dehydration mechanism of AlPO4-5: A high-resolution synchrotron X-ray powder diffraction study

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