THE EFFECT OF PHOSPHORUS ADDITION ON THE ACTIVITY OF BISMUTH MOLYBDATE CATALYST FOR PARTIAL OXIDATION OF PROPYLENE TO ACROLEIN

Hamzah Fansuri; Gia Hung Pham; Sandra Wibawanta; Dong-ke Zhang

doi:10.22146/ijc.21445

THE EFFECT OF PHOSPHORUS ADDITION ON THE ACTIVITY OF BISMUTH MOLYBDATE CATALYST FOR PARTIAL OXIDATION OF PROPYLENE TO ACROLEIN

https://doi.org/10.22146/ijc.21445

Hamzah Fansuri^(1*), Gia Hung Pham⁽²⁾, Sandra Wibawanta⁽³⁾, Dong-ke Zhang⁽⁴⁾

(1) Department of Chemistry, Institut Teknologi Sepuluh Nopember (ITS), Kampus ITS Sukolilo, Surabaya 60111
(2) Department of Chemical Engineering, Curtin University of Technology, Kent St Bentley WA 6102
(3) Department of Chemical Engineering, Curtin University of Technology, Kent St Bentley WA 6102
(4) UWA Centre for Energy, University of Western Australia, 35 Stirling Highway, Crawley WA 6009
(*) Corresponding Author

Abstract

In order to examine the effect of phosphorus addition on the activity and selectivity of bismuth molybdate catalysts for partial oxidation of propylene to acrolein, three modes of phosphorus addition were performed. The three modes of Preparation were performed by (1) adding phosphorus into a-Bi₂Mo₃O₁₂ to obtain Bi₂P_xMo₃O_y, (2) inserting phosphorus on bismuth sites to obtain Bi_2-xP_xMo₃O_y, and (3) inserting phosphorus on molybdenum sites to obtain Bi₂P_xMo_3-xO_y. Four major phases of bismuth phosphomolybdate were detected as the result of the phosphorus addition, namely a-Bi₂Mo₃O₁₂, Bi₉PMo₁₂O₅₂, MoO₃, and BiPO₄. Experimental results showed that the catalysts solely containing BiPO₄ and/or MoO₃ have very low activities for partial oxidation of propylene to acrolein. Meanwhile, catalysts containing a-Bi₂Mo₃O₁₂ and Bi₉PMo₁₂O₅₂, together with either MoO₃ or BiPO₄ showed on average the same activities as a-Bi₂Mo₃O₁₂ and one of them (combination of a-Bi₂Mo₃O₁₂, Bi₉PMo₁₂O₅₂ and MoO₃) has better performance than a-Bi₂Mo₃O₁₂ at lower temperatures. The presence of the oxygen donor phase, i.e. BiPO₄ and MoO₃, are believed to play a key role for the high activities of bismuth-phosphomolybdate catalysts. However, at higher temperatures, the presence of oxygen donor reduces the catalyst selectivity to acrolein.

Keywords

Propylene; Acrolein; Bismuth Molybdate; Partial oxidation

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DOI: https://doi.org/10.22146/ijc.21445