1. Improved catalytic activity and stability of mesostructured sulfated zirconia by Al promoter
- Author
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Sun, Yinyong, Yuan, Lina, Ma, Shengqian, Han, Yu, Zhao, Lan, Wang, Wei, Chen, Chang-Lin, and Xiao, Feng-Shou
- Subjects
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ZIRCONIUM oxide , *POLYMERS , *SURFACE active agents , *ISOMERIZATION - Abstract
Al-promoted mesostructured sulfated zirconia (Al-MSZ-5) has been successfully synthesized from the template of triblock polymer surfactant (P123) in aqueous solution. Mesostructured Al-MSZ-5 shows high thermal stability, and it can preserve its characteristic mesostructures until calcination at 650 °C. In contrast, the mesostructure of mesoporous sulfated zirconia (MSZ-5) will be destroyed during calcination at 600 °C. Catalytic data for n-butane isomerization show that the Al-MSZ-5 exhibits higher catalytic activity and better stability than both MSZ-5 and conventional Al-promoted sulfated zirconia (Al-SZ). The Al-MSZ-5 sample was characterized by XRD, bright-field and dark-field TEM images, N2 adsorption isotherms, NMR, TG–DTA, IR, and numerous other techniques. The results suggest that Al-MSZ-5 has worm-like mesopores, and that the mesostructured walls contain tetragonal crystalline ZrO2. Such unique structural features might be responsible for the observed large surface area, high catalytic activity for n-butane isomerization, and high thermal stability of mesostructured Al-MSZ-5. [Copyright &y& Elsevier]
- Published
- 2004
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