"

Cookies ussage consent

Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our site without changing the browser settings you grant us permission to store that information on your device.

I agree, do not show this message again.

Molecular sieves SBA-15 type doped with heteropolyacids: textural and structural properties

A. POPA1,* , V. SASCA1, E. E. KIŠ2, RADMILA MARINKOVIĆ-NEDUČIN2, J. HALASZ3

Affiliation

  1. Institute of Chemistry Timişoara, Bl.Mihai Viteazul 24, 300223 Timisoara, Romania
  2. University of Novi Sad, Faculty of Technology, Cara Lazara 1, Novi Sad, Serbia
  3. University of Szeged, Dep.of Applied and Environmental Chemistry, Rerrich ter 1, H-6720 Szeged, Hungary

Abstract

In order to be more effective for catalytic reactions, heteropolyacids (HPAs) are usually impregnated on different porous materials with high surface area. Highly dispersed heteropolyacids species, H3PMo12O40 and H4PVMo11O40 were supported on SBA-15 and Ti- SBA 15 molecular sieves. All supported HPAs were prepared by impregnation using the incipient wetness techniques with a mixture water: ethanol = 1:1. The structure and texture of H3PMo12O40 and H4PVMo11O40 supported on SBA 15 and Ti- SBA 15 were studied by XRD, FT-IR, low temperature nitrogen adsorption and scanning electron microscopy SEM with EDS. FT-IR studies showed that HPAs anions preserved their Keggin structure after deposition on SBA-15 and Ti- SBA 15 supports. X-ray diffraction and SEM studies confirmed the uniformity of the distribution of active phase in the catalyst samples. The values of specific surface area of both HPAs were increased by deposition on molecular sieve supports. It is found that most of HPMo and HPVMo (active phases) in samples are well dispersed on the support and SBA-15 supported HPA still keeps its Keggin structure. The surface morphology of the SBA- 15 supported samples is almost similar to that of SBA-15 support. A relatively uniform distribution of active phase in the support pores was evidenced by EDS analysis..

Keywords

Heteropolyacids, Molecular sieves, Texture, Structure, BET, SEM, XRD.

Submitted at: May 9, 2007
Accepted at: Nov. 16, 2007

Citation

A. POPA, V. SASCA, E. E. KIŠ, RADMILA MARINKOVIĆ-NEDUČIN, J. HALASZ, Molecular sieves SBA-15 type doped with heteropolyacids: textural and structural properties, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 11, pp. 3645-3650 (2007)