Hydroisomerization of n-Hexadecane Over Anion Modified Pt/HfO2 Catalysts

作者：Gnanamani Muthu Kumaran; Linganiso Linda Z; Jacobs Gary; Keogh Robert A; Shafer Wilson D; Davis Burtron H^*

来源：Catalysis Letters, 2012, 142(10): 1180-1189.

DOI：10.1007/s10562-012-0882-5

• Tungstated-hafnia
• Sulfated hafnia
• Tungstated-zirconia
• Hydroisomerization
• n-Hexadecane
• Cracking

Pt-promoted tungsten-hafnia catalysts containing different amounts of tungsten (15 and 20 wt% WO3) were prepared and tested for hydroisomerization of n-hexadecane in a trickle-bed reactor. All catalysts were calcined under dry air flow at 723 K for 3 h. Pt-promoted sulfated hafnia was also prepared for the purpose of comparison. The catalysts were characterized using BET surface area, X-ray diffraction, and DRIFTS for the adsorption of pyridine. Tungsten-based hafnia catalysts exhibit moderate activity (%26lt; 80 %) for hydroisomerization of n-hexadecane at a higher operating temperature of 673 K compared to sulfated hafnia (%26gt; 95 %), which had an operating temperature of 493 K. However, tungsten-based hafnia catalysts were more selective towards iso-C-16 even at higher n-hexadecane conversions. More cracking products were obtained with sulfated hafnia in which the selectivity to iso-C-16 decreases exponentially with n-hexadecane conversion. The less acidic tungsten-hafnia catalysts may be suitable for producing more isomerized products compared to the sulfated analog.

• 出版日期2012-10