Formation and catalytic characterization of various rare earth phosphates

Onoda, Hiroaki; Nariai, Hiroyuki; Moriwaki, Ai; Maki, Hideshi; Motooka, Itaru

doi:10.1039/b110121h

Cited by 152 publications

(104 citation statements)

References 30 publications

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“…Phosphates have been used for ceramic materials, catalysts, adsorbents, fluorescent materials, dielectric substances and biomaterials, for metal surface treatment, as fertilizer, detergents and food additives, in fuel cells and pigments, and in other applications [4][5][6][7][8]. Phosphate materials are well known to have high affinity for living organisms.…”

Section: Introductionmentioning

confidence: 99%

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pH-controlled hydrothermal synthesis of titanium phosphates and their powder properties

Onoda

Yamaguchi

2014

J Adv Ceram

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Titanium phosphates were prepared from titanium chloride and sodium pyrophosphate at various pH in hydrothermal process as a novel white pigment for cosmetics. Their chemical composition, powder properties, photo catalytic activity, colour phase and smoothness were studied. The obtained materials had a higher Ti/P ratio than that used in preparation conditions because of the formation of titanium oxide and hydroxide. The samples prepared at pH = 4 had particles smaller than 100 µm. Titanium phosphates had less photo catalytic activity to protect the sebum on the skin. The obtained materials in hydrothermal process and their thermal products at 100 ℃ showed high reflectance in the range of visible light.

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Section: Introductionmentioning

confidence: 99%

“…Phosphates are transformed to other forms of phosphates by hydrolysis and dehydration reactions at elevated temperatures [4]. These condensed phosphates have novel functional properties, because these condensed phosphates have different properties with orthophosphates [5].…”

Section: Introductionmentioning

confidence: 99%

pH-controlled hydrothermal synthesis of titanium phosphates and their powder properties

Onoda

Yamaguchi

2014

J Adv Ceram

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“…The catalytic and adsorptive properties of phosphates were affected from specific surface area [1][2][3] . To improve the functional properties, porous phosphate, which had large specific surface area, was prepared in previous reports 4,5 .…”

Section: Introductionmentioning

confidence: 99%

Formation of Teteravalent Cerium Phosphate in Suspension and Their Powder Properties

Onoda

Ikawa

2011

Phosphorus Research Bulletin

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The preparation process was studied to obtain phosphate material with large specific surface area. Tetravalent cerium phosphate was prepared from ammonium cerium nitrate and phosphoric acid. In this system, as a solvent, water and ethanol were used, the solvent volume was limited, propionic acid and n-butylamine were added. These preparation conditions had much influence on the ratio of cerium/phosphorus. By the addition of n-butylamine, specific surface area of cerium phosphate became large. The adsorption ratio of basic stinking gas increased with the addition of propionic acid and n-butylamine in suspension condition.

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“…An excess of phosphorous in the reagent mixture always leads to polyphosphates formation, and for this reason, an equimolar ratio of La:P is optimal for the preferred orthophosphate synthesis. Different compounds H 3 PO 4 , NH 4 H 2 PO 4 , Na 3 PO 4 ·12H 2 O, P 2 O 5 , organic compounds [26] are usually used as the phosphate group containing precursors.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and study of anhydrous lanthanide orthophosphate (Ln = La, Pr, Nd, Sm) nanowhiskers

Bryukhanova¹,

Никифорова²,

Гавричев³

2016

Nanosystems: Phys. Chem. Math.

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The effect of hydrothermal synthetic conditions on the obtaining of lanthanide orthophosphates LnPO 4 (Ln = La, Pr, Nd, Sm) with different structure, size and shape of particles was revealed. The optimum conditions for preparation of anhydrous nanoscale lanthanide orthophosphates with monoclinic structure were determined. The prepared nanowhiskers had lengths ranging from 0.4 µm (for LaPO 4 ) to 5 µm (for SmPO 4 ), and the diameter -from 30 nm (for LaPO 4 ) to 200 nm (for SmPO 4 ). The size of particles synthesized under similar conditions increased with decreased of lanthanide ion radius.

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Formation and catalytic characterization of various rare earth phosphates

Cited by 152 publications

References 30 publications

pH-controlled hydrothermal synthesis of titanium phosphates and their powder properties

pH-controlled hydrothermal synthesis of titanium phosphates and their powder properties

Formation of Teteravalent Cerium Phosphate in Suspension and Their Powder Properties

Synthesis and study of anhydrous lanthanide orthophosphate (Ln = La, Pr, Nd, Sm) nanowhiskers

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