Sains Malaysiana 50(8)(2021): 2395-2405

http://doi.org/10.17576/jsm-2021-5008-21

 

Physicochemical Properties of MoVTeNb Mixed Oxide Catalysts Synthesized using Different Vanadium Sources

(Sifat Fizikokimia Pemangkin Pencampuran Oksida MoVTeNb Dihasilkan dengan Punca Vanadium yang Berbeza)

 

HASLINDA MOHD SIDEK1,2, IRMAWATI RAMLI1,2*, NORHAZLIN ZAINUDDIN2, HOSSEIN ABBASTABAR AHANGAR3 & TAUFIQ-YAP YUN HIN1,2,4

 

1Catalysis Science and Technology Research Centre (PutraCAT), Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan, Malaysia

 

2Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan, Malaysia

 

3Department of Chemistry, Islamic Azad University, Najafabad Branch, 85141-43131 Najafabad, Iran

 

4Chancellery Office, Universiti Malaysia Sabah, 88400 Kota Kinabalu, Sabah, Malaysia

 

Diserahkan: 6 November 2020/Diterima: 30 Disember 2020

 

ABSTRACT

The use of different vanadium sources in the synthesis of multi-metal MoVTeNb oxide catalysts has been investigated for their effect on the physicochemical properties of catalysts. Metal oxides were synthesized by slurry method assisted with a microwave irradiation. Vanadium pentoxide (V2O5), vanadyl sulphate (VOSO4) and ammonium metavanadate (NH4VO3) were used as the vanadium sources, respectively. X-ray diffraction (XRD) pattern showed the existence of orthorhombic (M1) phases in all catalysts.  The catalyst prepared using V2O5 produced the highest formation of the phase. This was further supported by Inductive Couple Plasma-Atomic Emission Spectroscopy (ICP-AES), which showed that the V2O5 catalyst has the highest V: Mo ratio, mainly responsible for the high catalytic activity. Temperature Programmed Reduction in Hydrogen (H2-TPR) showed better reducibility for the catalyst when compared to the others. Temperature Programmed Reaction (TPRn) confirmed that the oxidants active for propane conversion into acrylic acid were originated from the lattice of the catalyst.

Keywords: Acrylic acid; anaerobic reaction; MoVTeNb mixed metal oxide; propane oxidation; vanadium source

 

ABSTRAK

Penggunaan punca vanadium yang berlainan dalam sintesis pemangkin oksida berbilang logam MoVTeNb telah dikaji kesannya terhadap sifat fizikokimia mangkin. Logam oksida disintesis dengan kaedah buburan berbantu radiasi gelombang mikro. Vanadium pentoksida (V2O5), vanadil sulfat (VOSO4) dan amonium metavanadat (NH4VO3) telah digunakan sebagai sumber vanadium. Corak pembelauan sinar-X (XRD) mendedahkan kewujudan fasa ortorombik (M1) pada semua sampel. Sampel yang disediakan menggunakan V2O5 menghasilkan pembentukan fasa tersebut yang tertinggi. Ini disokong oleh Plasma Gandingan Aruhan-Spektroskopi Pancaran Atom (ICP-AES), yang menunjukkan bahawa mangkin V2O5 mempunyai nisbah V: Mo tertinggi, kerana ia bertanggungjawab untuk meningkatkan aktiviti pemangkinan. Penurunan Suhu Berprogram Hidrogen (H2-TPR) menunjukkan sifat kebolehturunan yang lebih baik untuk mangkin ini berbanding dengan yang lain. Tindak Balas Suhu yang Diprogramkan (TPRn) mengesahkan bahawa oksidan aktif bagi penukaran propana kepada asid akrilik berasal daripada kekisi mangkin.

Kata kunci: Asid akrilik; logam oksida campuran MoVTeNb; pengoksidaan propana; punca vanadium; tindak balas anaerobik

 

RUJUKAN

Al-Saeedi, J.N., Guliants, V.V., Guerrero-Perez, O. & Banares, M.A. 2003. Bulk structure and catalytic properties of mixed Mo-V-Sb-Nb oxides for selective propane oxidation to acrylic acid. Journal of Catalysis 215(1): 108-115.

Baca, M., Pigamo, A., Dubois, J.L. & Millet, J.M.M. 2003. Propane oxidation on MoVTeNbO mixed oxide catalysts: Study of the phase composition of active and selective catalysts. Topics in Catalysis 23(1): 39-46.

Bakiro, M., Ahmed, S.H. & Alzamly, A. 2019. Effect of pH, surfactant, and temperature on mixed-phase structure and band gap properties of BiNbO4 nanoparticles prepared using different routes. Chemistry 1: 89-110.

Beato, P., Blume, A., Girgsdies, F., Jentoft, R.E., Schlogl, R., Timpe, O., Trunschke, A., Weinberg, G., Basher, Q., Hamid, F.A., Hamid, S.B.A., Omar, E. & Mohd Salim, L. 2006. Analysis of structural transformations during the synthesis of a MoVTeNb mixed oxide catalyst. Applied Catalysis A: General 307(1): 137-147.