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Issue 6, 2002
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Various rare earth phosphates [rare earth elements: R = La, Ce, Pr, Nd, Sm, Yb, and Y; phosphates: Monazite-type, Xenotime-type, Rhabdophane-type, and Weinshenkite-type orthophosphates RPO4, polyphosphate R(PO3)3, and ultraphosphate RP5O14] were synthesized by heating the mixtures of each rare earth oxide and diammonium hydrogenphosphate or phosphoric acid. The compositions of rare earth phosphates were determined by XRD, FT-IR, and TGDTA. Catalytic properties were studied as one of properties of various rare earth phosphates. Specific surface areas of samples were measured by the BET method. Acid strengths and amounts of acidic sites were measured using several indicators by n-butylamine titration. Acidic properties were also confirmed by adsorption of ammonia. Various rare earth phosphates were characterized by catalytic activities on dehydration reaction of 2-propanol, cracking/dehydrogenation reaction of cumene, and isomerization reaction of butene. The characterization of catalysts was discussed with regard to type of rare earth elements, type of phosphates, and type of phosphorus resources.

Graphical abstract: Formation and catalytic characterization of various rare earth phosphates

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The article was received on 06 Nov 2001, accepted on 11 Apr 2002 and first published on 29 Apr 2002

Article type: Paper
DOI: 10.1039/B110121H
J. Mater. Chem., 2002,12, 1754-1760

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    Formation and catalytic characterization of various rare earth phosphates

    H. Onoda, H. Nariai, A. Moriwaki, H. Maki and I. Motooka, J. Mater. Chem., 2002, 12, 1754
    DOI: 10.1039/B110121H

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