TPD and TPR Studies of Vanadyl Pyrophosphate Catalysts derived from VOPO4·2H2O Precursor

Authors

  • Y.H. Taufiq-Yap Department of Chemistry, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
  • K.C. Waugh Department of Chemistry, University of Manchester Institute of Science and Technology, PO Box 88, Manchester, M60 1QD, United Kingdom
  • C.P. Ho Department of Chemistry, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia

Abstract

Three vanadyl pyrophosphate catalysts synthesised via VOPO4·2H2O have been calcined for 40, 100 and 132 hours at 673 K in a reaction flow of n-butane/air. These catalysts were denoted VPD40, VPD100 and VPD132. The nature of oxidants in/on these catalysts has been investigated by using temperatureprogrammed techniques. One peak maximum was found desorbed in O2 temperature programmed desorption (TPD) at 992 K for VPD40 with a total amount of oxygen desorbed of 2.4×1020 mol×g-1. However an increased of calcination duration to 100 and 132 hours produced one oxygen peak desorbed at 986 K with a total amount of oxygen desorbed doubled to 4.4×1020 mol×g-1. Temperature programmed reduction with H2 resulted in the removal of ~ 10 times more than the lattice oxygen which can be desorbed thermally with the development of a new low reduction peak at ~ 840 K.

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Published

2004-06-28

How to Cite

Taufiq-Yap, Y., Waugh, K., & Ho, C. (2004). TPD and TPR Studies of Vanadyl Pyrophosphate Catalysts derived from VOPO4·2H2O Precursor. Eurasian Chemico-Technological Journal, 6(2), 113–115. Retrieved from https://ect-journal.kz/index.php/ectj/article/view/701

Issue

Vol. 6 No. 2 (2004)

Section

Articles

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