α-TiP-Supported Vanadium Oxide Catalysts: Influence of Calcination Pretreatments on Structure and Performance for o-Xylene Oxidation

Val, S. del; Granados, M. Lòpez; Fierro, J.L.G.; Santamaría‐González, J.; López, Antonio Jiménez; Blasco, Teresa

doi:10.1006/jcat.2001.3417

Cited by 12 publications

(1 citation statement)

References 54 publications

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“…For H-TiP materials (in proton form), the 31 P resonance lines of −H 2 PO 4 ion-exchange units are observed in the range of −5 to −11 ppm, while the lines corresponding to −HPO 4 groups are expected to be up to −25 ppm. The resonance line of −PO 4 groups would appear between −25 and −35 ppm, and finally, poly/pyrophosphate groups would be observed from −35 to −55 ppm. − Regarding the Na form of TiP, the chemical shifts for −PO 4 /–HPO 4 /–H 2 PO 4 are expected to shift toward lower frequencies due to the presence of Na + ions …”

Section: Resultsmentioning

confidence: 99%

Complete Column Trials for Water Refinement Using Titanium(IV) Phosphate Sorbents

Trublet

Rusanova

2018

ACS Sustainable Chem. Eng.

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A titanium phosphate sorbent with linked active units (LTP) is synthesized. XRD, 31P MAS NMR, and TGA techniques are used to disclose the relation between the ion-exchange units of −HPO4 (crystalline α-TiP) and of −H2PO4 (amorphous TiP1) type. The reported kinetics data of TiP1 sorbent in batch mode have been reprocessed according to the nonlinear approach in order to explore further the sorption mechanism. It was found that the data could be well described by the pseudo-second-order model in the case of Ni2+ ions. Consequently, fixed-bed column sorption experiments of Ni2+ ions on LTP were designed, and the effects of both the amount of nickel(II) ions in the feed solution and the flow rates on the sorption equilibrium were studied. The ion-exchange capacity is estimated to be 1.6 meq·g–1 during the first four cycles before decreasing to 1.2 meq·g–1 for cycles five and six. The experimental data were simulated following the Thomas model, and desorption experiments with HCl were performed. Observations show that regeneration and reutilization of the LTP ion-exchanger are possible through at least six cycles. It is revealed that the sorption performances in column conditions could be undoubtedly predicted from the corresponding batch sorption data.

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