Rhac sac had a specific 2 1 surface area of 250 m g

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Unformatted text preview: as a homogeneous catalyst also gave similar results to that of RHAC-Sac. RHAC-Sac could be reused several times by regenerating at 150 °C. MAT-O6 STUDY OF HYDROGEN UPTAKE ON Pt/MoO3 1 Sharifah Najiha Timmiati, Sugeng Triwahyono, Aishah Abdul Jalil, Nurun Najwa Ruslan, Ainul 2 Hakimah Karim and Nurrulhidayah Ahmad Fadzlillah 1 2 1 2 2 Department of Chemical Enneneering, Faculty of Chemical and Natural Resources Engi neering, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia 2 Ibnu Sina Institute for Fundamental Science Studies, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia E-mail: [email protected] The rate controlling step and the energy barrier involved in the hydrogen adsorption over Pt/MoO 3 were studied. Rates of hydrogen adsorption on Pt/MoO3 were measured at the adsorption temperature range of 323 – 573 K and at the initial hydrogen pressure of 6.7 kPa. The rate of hydrogen u ptake was very high for the initial few minutes for adsorption at and above 473 K, and reached equilibrium within 2 h. At and below 423 K, the hydrogen uptake still continued and did not reach equilibrium after 10 h. The hydrogen uptake exceeded the H/Pt ratio of unity for adsorption at and above 423 K, indicating that hydrogen adsorption involves hydrogen atom spillover and surface diffusion of the spiltover hydrogen atom over the bulk surface of MoO3 followed by formation of HxMoO3. The hydrogen uptake was scarcely appreciable for Pt-free MoO3. The rate controlling step of the hydrogen adsorption on Pt/MoO 3 was the surface diffusion of the spiltover hydrogen with the activation energy of 83.1 kJ/mol. 145 23rd-25th June 2010 3rd ICYC 2010 Universiti Sains Malaysia MAT-O7 LIQUID-PHASE ALKYLATION OF PHENOL OVER SOLID SULFANILIC ACID CATALYST Tamar Hussein Ali, Farook Adam and Kasim Mohammed Hello School of Chemical Sciences, Universiti Sains Malaysia, 11800 Pulau Pinang, Malaysia E-mail: [email protected] Alkylation of phenol has been a subject of interest due to its industri...
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This note was uploaded on 02/17/2011 for the course CHEMISTRY 101 taught by Professor Csr during the Spring '11 term at University of Louisville.

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