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Influence of Organic Species on the Characteristics of Mo-V Oxides

Woi, P.M. and Irmawati Ramli, and Taufiq-Yap, Yun Hing (2007) Influence of Organic Species on the Characteristics of Mo-V Oxides. Malaysian Journal of Analytical Sciences, 11 (1). pp. 160-165. ISSN 13942506

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Official URL: http://pkukmweb.ukm.my/~mjas/v11_n1/24_413C3-1-1.pdf

Affiliations

Universiti Putra Malaysia, Faculty of Science, Dept. of Chemistry

Abstract

This study investigates on the effect of organic species on the characteristics of molybdenum-vanadium mixed oxide catalysts. The MoV precursors were prepared by homogeneous precipitation method using urea hydrolysis. The oxides were later treated with three organic species namely polyvinyl alcohol (PVA), malic acid (MA) and adipic acid (AA). The solutions were refluxed in a prescribed time. The solid obtained were calcined and subsequently denoted as MoV(PVA), MoV(MA) and MoV(AA). Interesting results in which high surface area values (SBET) were obtained in the range between 10 to 20 m2 g-1. XRD reckoned the samples are in highly crystalline form. H2-Temperature programmed reduction analysis showed that the total number of oxygen removed are 1.4 x 1022 atoms g-1, 3.3 x 1022 atoms g-1 and 1.8 x 1022 atoms g-1 for MoV(PVA), MoV(MA) and MoV(AA) respectively.


Kajian ini dijalankan untuk memperolehi kesan spesis organik terhadap ciri-ciri mangkin molibdenum-vanadium oksida tercampur. Prekursor MoV telah disediakan melalui kaedah pemendakan homogen menggunakan hidrolis urea. Prekursor MoV ini telah dirawat dengan masing-masing bahan organik polivinil alkohol (PVA), asid malik (MA) dan asid adipik (AA). Kesemua larutan telah direfluks pada masa yang ditetapkan. Pepejal yang diperolehi telah dikalsin dan dilabelkan sebagai MoV(PVA), MoV(MA) dan MoV(AA). Keputusan yang menarik berjaya dicapai di mana nilai luas permukaan yang tinggi (SBET) antara 10 hingga 20 m2 g-1 telah berjaya diperolehi. Pembelauan sinar-X (XRD) menunjukkan bahawa samepl-sampel adalah berhablur. Analisis penurunan berprogram suhu dalam hidrogen (H2-TPR) menunjukkan jumlah oksigen yang berjaya dikeluarkan adalah masing-masing 4 x 1022, 3.3 x 1022 dan 1.8 x 1022 atom g-1 bagi sampel MoV(PVA), MoV(MA) dan MoV(AA).

Item Type:Journal
Additional Information:Financial assistance from Ministry of Science, Technology and Innovation Malaysia IRPA grant (Project No. 09-02-04-0286-EA001) is gratefully acknowledged.
Keywords:Mo-V oxides, homogeneous precipitation, organic species, H2-TPR
Subjects:Q Science
ID Code:1035

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VCH.

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