Programme Book - UPM - Universiti Putra Malaysia

P26 THE SYNTHESIS AND EFFECTS OF Ph ANDCALCINATION TEMPERATURE ON THE CHARACTERISTICS OFMo-V-O CATALYSTSH. Mohd Sanusi, H.R. Wong, J.H. Chin, I.Ramli*, H. Mohd Sidek, S.Mohd NoorDepartment of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 UPMSerdang, Selangor, MalaysiaCorresponding Author: irmawati@science.upm.edu.myMoVO x usage as a catalyst has been of much interest lately for its various oxidationreactions including the selective propane oxidation to acrylic acid. This pathway is analternative route to the conventional one using alkene as the starting material. Thepreparation of Molybdenum Vanadium Oxide, MoVO x was successfully synthesizedby using the microwave irradiation method. In this research, the main source ofVanadium used isAmmonium Metavanadate, NH 4 VO 3 whereas the main source forMolybdenum is Ammonium Heptamolybdate, (NH 4 ) 6 Mo 7 O 24 •4H 2 O. The ratio ofMolybdenum to Vanadium is 1:0.3. These samples were calcined for three hours at280 o C before flowing in the Nitrogen gas at different calcinations temperature(300, 400, 500, and 600). Synthesis parameters such as calcinationtemperature and pH of precursor were found to have a profound effect on the catalyststructure and chemical properties.The properties of the precursors and of the catalystsobtained were characterized by Thermogravimetric/DerivativeThemogravimetric(TG/DTG), X-Ray Diffraction (XRD), Scanning ElectronMicroscopy (SEM), Temperature Programmed Reduction in Hydrogen (H 2 -TPR),Fourier Transform InfraredSpectroscopy (FT-IR)and Inductively Coupled PlasmaAtomic Emission Spectroscopy (ICP-AES). By comparing the obtained results, thesample with calcination temperature of 600 was the best with the most acceptableproperties which will later be studied on the effects of precursor preparation pH (6.5,4.5, 2.5 and 1.0).At 600°C the FT-IR spectrum showed the Mo and V bonding withinthe range of 1000cm -1 and the complete removal of organic species. XRD analyses ofthese catalysts indicated that the tetragonal phase is the active phase of the Mo-V-Owhere a well developed tetragonal phase was successfully achieved when catalystsprepared at pH 2.5 gave the highest peak at 2θ = 6° and 8°. The SEM image capturedon the catalysts prepared also suggested that the sample prepared at pH 2.5 presentedthe highest crystalline phases among the others. The obtained results showmorphology of the MoVO x in rectangular-rod shape which is possible evidence thatthe precursor preparation pH would have a strong effect on the characteristics of theMoVO x catalysts. Among the catalyst samples, MoVO x prepared at pH 2.5 presentedmore concrete crystalline tetragonal phases comparatively. The oxide was found tohave Molybdenum to Vanadium atomic ratio of 1:0.3, which were supported by theICP-AES analysis conducted.41 |16 th Industrial Chemistry Seminar: Chemistry- A Passport to a Brighter Future