The Malaysian Journal of Analytical Sciences Vol 13 No 1 (2009): 86 – 93

 

 

 

ROLE OF NICKEL PROMOTER ON ACTIVE SITE OF MoVTeNb OXIDE CATALYST FOR SELECTIVE OXIDATION OF PROPANE

 

Rubia Idris^1*, Sharifah Bee Abd Hamid²

 

¹School of Science & Technology, Universiti Malaysia Sabah, UMS, Locked Beg No.2073,

88999 Kota Kinabalu, Sabah.

²Combinatorial Technology and Catalysis Research Centre, Universiti Malaya,

50603 Kuala Lumpur, Malaysia

 

*Corresponding author:  rubia@ums.edu.my

 

Abstract

Role of Ni-promoters on the modification of active sites of MoVTeNb oxide catalysts for selective oxidation of propane was investigated. This Ni-metal promoter of MoVTeNb oxide catalyst was prepared by co-precipitation method. The catalysts were characterized by BET, XRD, SEM-EDX and TGA-DSC. The characterisation results show an important difference depending on the weight loading of Ni-metal promoter. From the XRD analysis, structure of orthorhombic M1, M2, TeMo₅O₁₆, V_0.95Mo_0.97O₅ and Mo₅O₁₄ phases was investigated. From literature it is known that the successful catalyst for selective oxidation of propane to acrylic acid should be a mixture of two phases of orthorhombic and hexagonal variant of the MoVTeNb catalyst system which is referred to M1 and M2 phases [11].  At low-magnification of SEM analysis it has revealed the multi-phase nature of the Ni-metal promoter. The segregation of nickel metal in the MoVTeNb oxide catalysts was proven elemental presence by the EDX method.  BET result showed that the surface areas of Ni-promoter catalysts were increase when the weight loading of Ni-promoter increases from 0.005at% to 0.05at%. TGA and DSC results also agree that the addition of small amounts of Ni-promoter affects the thermal behavior of the oxide mixture. This indicates that the catalytic operation of the nickel promoter acts as a structural promoter by changing the redox behavior of the whole metal-ligand system.

 

Keywords:  Ni-Promoter MoVTeNb oxide catalyst, BET, SEM-EDX, XRD, TGA and DSC.

 

References

1.     M.M.Lin, M.Linsen, M.William, (1999), A process for preparing a multimetal oxide catalyst for oxidation of alkanes to unsaturated aldehydes or carboxylic acids. Eur.Pat.Appl., 962, 253, A2.

2.     T.Ohara, M.Ueshima, I.Yanagisawa, (1972), JP Patent 47-42241B.

3.     N.Kurata, T.Matsumoto, T.Ohara, K.Oda, (1967), JP Patent 42-9805B.

4.     I.Nagai, I.Yanagisawa, M.Nimomiya, T.Ohara, (1983), Carbon black, JP Patent 58-17172B.

5.     G.Blanchard, G.Ferre, (1994), Tin-containing oxidation catalysts for preparation of unsaturated carboxylic acids. Eur. Pat. Appl. 609,122-A1.

6.     Mazzocchia, C.Tempesti, E.Anouchinsky, R. Kaddouri, A. Hakim, (1994), FR Patent 2,693,384.

7.     Bartek, J.P.Ebner, A.M. Brazdil, R.James, (1993), Process for oxidation of propane. US Patent 5,198,580.

8.     Ushikubo, T. Nakamura, H. Koyasu, Y. Wajiki, Shin., (1994) US Patent 5,380, 933.

9.     M.Hatano, A.Kayo, (1992),  EP Patent 0,318,295 B1

10.  M.M.Lin, (2001), Review: Selective Oxidation of Propane to Acrylic Acid With Molecular Oxygen, Applied Catalysis A: General, 207, 1-16.

11.  R.K.Grasselli, (1999), Advances and future trends in selective oxidation and ammoxidation catalysis, Catalysis Today, 49(1-3), 141-153.

12.  Grasselli, R.K., Burrington, J.D., Buttrey, D.J., De Santo, P., Lugmair, Jr., Claus G.V., Anthony, F., Weingand, Jr., Thomas. 2003.  Multifunctionality of Active Centers in (Amm)oxidation Catalysts: From Bi-Mo-Ox to Mo-V-Nb-(Te, Sb)-Ox., Topic in Catalysis, 23(1-4), 5-22.

13.  M.M.Lin., C.Long., M.Linsen., F.Kiser., P.Klugherz., J.McGregor., M.Clark., (2000), Catalysis and Surface Science, Symposium, 219^th ACS Meeting.

14.  H.Watanabe, Y.Koyasu, (2000), New synthesis route for Mo-V-Nb-Te mixed oxide catalyst for propane ammoxidation, Applied Catalysis.A: General, (194-195), 479-485.

15.  L.W.Luo, L.Yamashita, H.Labinger, J.A.Davis, M.E., (2000), Synthesis and characterization of zeolite beta containing oxide clusters of antimony and vanadium, Microporous and Mesoporous Materials, 37(1-2), 57-65.

 16. M.M.Lin., T.B.Desai., F.W.Kaiser., P.D.Klugherz., (2000), Reaction pathways in the selective oxidation of propane over a mixed metal oxide catalyst, Catalysis Today 61(1-4), 223-229. 

17.  N.Fujikawa., K.Wakui., K.Tomita., N.Ooue., W.Ueda., (2001), Challenges in Alkane Activation and Selective Oxidation. (Proceedings of a Workshop held 30 November-1 December 2000 in Yokohama, Japan, Catalysis Today 71(1-2), 223.