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Effect of Number of Washing on the Characteristics of Copper Oxide Nanopowders

Muhamad E.N., and Irmawati Ramli, and Abdullah A.H., and Taufiq-Yap Yun Hing, and Abdul Hamid S.B., (2007) Effect of Number of Washing on the Characteristics of Copper Oxide Nanopowders. Malaysian Journal of Analytical Sciences, 11 (1). pp. 294-301. ISSN 13942506

Full text not available from this repository.

Official URL: http://pkukmweb.ukm.my/~mjas/v11_n1/44_66PC7-IR-SKAM19_Ernee-1.pdf

Affiliations

Universiti Putra Malaysia, Faculty of Science, Dept. of Chemistry
University of Malaya, Combinatorial Technology and Catalysis Centre

Abstract

The effect of washing on physico-chemical properties of copper oxide prepared via precipitation method was investigated by means of X-ray diffraction (XRD), Fourier transform infrared (FTIR), BET surface area measurement and scanning electron microscopy (SEM ). Increasing the number of washing has successfully removed undesired nitrate resulting in high surface area CuO catalysts from 8.5 to 15.9 m2 g-1. XRD pattern of these oxides gave well crystalline of CuO with main peak appeared at 2q = 35.5°, 38.7° and 48.7°. The powders obtained are of uniform size distribution, finely grained with an average size of 20 nm. In addition, an investigation on the mobility of oxygen species carried out using transient technique i.e. temperature programmed reduction (TPR) shows that reduction peak maximum moved towards lower reduction temperature with the increasing number of washing. This indicates the ease of reducibility of the oxide when the precursor is washed several times. It is clearly found that
particle size was profound effect on the catalytic activity of CuO.

Kesan cucian terhadap ciri-ciri fizik-kimia kuprum oksida yang disediakan melalui kaedah pemendakan telah dikaji menggunakan pembelauan sinar-X (XRD), spektrometer inframerah transformasi Fourier (FTIR), pengukuran luas permukaan BET dan mikroskop elektron pengimbasan (SEM). Didapati melalui penambahan bilangan cucian, ia telah berjaya menyingkirkan ion nitrat dan ini menghasilkan mangkin CuO berluas permukaan tinggi bernilai antara 8.5 hingga 15.9 m2 g-1. Oksida ini menunjukkan pola XRD CuO berhablur dengan puncak utama muncul pada 2q = 35.5°, 38.7° and 48.7°. Serbuk yang diperolehi bersaiz seragam, berbutiran halus dengan saiz purata 20 nm. Penyelidikan terhadap kelincahan spesis oksigen juga telah dijalankan dengan menggunakan teknik alihan iaitu penurunan suhu terprogram (TPR) yang menunjukkan puncak maksimum penurunan bergerak ke arah suhu lebih rendah apabila bilangan cucian meningkat. Ini menunjukkan penurunan oksida semakin mudah apabila prekursor dicuci beberapa kali. Juga dikenalpasti saiz partikel mempunyai kesan mendalam terhadap aktiviti pemangkinan CuO.

Item Type:Journal
Additional Information:This project is financially supported by Ministry of Science, Technology and Innovation, Malaysia (MOSTI) under Prioritised Research, IRPA RM8.
Keywords:Copper oxide, precipitation method, effect of washing, TPR, reduction
Subjects:Q Science, Computer Science
ID Code:1059

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