UPM Institutional Repository

Effects of Bi and Ni on the properties of a vanadium phosphorus oxide catalyst


Yap, Taufiq Yun Hin and Yuen, Choon Seon and Nawi @ Mohamed, Nurul Suziana and Ramli, Irmawati (2014) Effects of Bi and Ni on the properties of a vanadium phosphorus oxide catalyst. Chinese Journal of Catalysis, 35 (2). pp. 270-276. ISSN 1872-2067


Vanadium phosphorus oxide (VPO) catalysts were synthesized by the dihydrate method which involved the two steps for the preparation of the dihydrate (VOPO4·2H2O) and the precursor hemihydrate (VOHPO4·0.5H2O). Bi and Ni salt were added into the mixture of VOPO4·2H2O and isobutanol, and the obtained precursors were calcined in a flow of a n-butane/air mixture to produce the promoted VPO catalysts. The catalysts were characterized by X-ray diffraction (XRD), N2 adsorption-desorption, inductively coupled plasma-atomic emission spectroscopy, scanning electron microscopy (SEM), and H2 temperature-programmed reduction (H2-TPR). Their catalytic properties were tested using a fixed-bed microreactor. All the catalysts gave main XRD peaks at 2θ = 22.9°, 28.5°, and 30.0°, attributing to the (020), (204), and (221) planes of the pyrophosphate phase (VO)2P2O7, respectively. The promoted catalysts have smaller crystallite size and higher specific surface areas. SEM micrographs revealed the formation of more prominent plate-like crystallites that were arranged as rosette clusters. H2-TPR results showed that the promoted catalysts had lower reduction peak temperatures and possessed higher amounts of V5+-O2– and V4+-O– pairs, which gave higher selectivity and activity in the selective oxidation of n-butane to maleic anhydride.

Download File

PDF (Abstract)
Effects of Bi and Ni on the properties of a vanadium phosphorus oxide catalyst.pdf

Download (152kB) | Preview

Additional Metadata

Item Type: Article
Divisions: Faculty of Science
DOI Number: https://doi.org/10.1016/S1872-2067(12)60749-9
Publisher: Elsevier
Keywords: Vanadium phosphorus oxide catalyst; Promoter; n-Butane oxidation; Maleic anhydride selectivity
Depositing User: Nabilah Mustapa
Date Deposited: 06 Aug 2015 07:19
Last Modified: 22 Oct 2015 03:45
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1016/S1872-2067(12)60749-9
URI: http://psasir.upm.edu.my/id/eprint/37338
Statistic Details: View Download Statistic

Actions (login required)

View Item View Item