On the Role of Calcination Temperature in Pt-SO 4 2− /ZrO2−Al2O3 Preparation and Catalytic Behaviors During the n-Hexane Hydroisomerization

Abstract

Effects of calcination temperature for Pt-SO 4 2-/ ZrO 2 -Al 2 O 3 (PSZA) catalysts in n-hexane hydroisomerization were investigated by N 2 -adsorption, XRD, TG-DTA, FTIR, XPS and H 2 -TPR. An optimum calcination temperature is helpful to complete the crystallization process, resulting in better distribution of alumina into zirconia crystal and producing new acid centers responsible for higher catalytic activity.

Effects of calcination temperature and water-washing treatment on n-hexane hydroisomerization behavior of Pt-promoted sulfated zirconia based catalysts

“…However, comparison between the effect of calcination temperature on the isomerization catalytic activity of PSZ, PSZA and PSZAY is rarely reported up to now. The previous investigation from our group showed that the optimized calcination temperature for PSZA was 650 • C [10]. The present experiment results also indicate that PSZ and PSZ modified with Al and rare earth Y exhibited relatively higher catalytic activity when the calcination temperature was 650 • C. However, the further increase in the temperature had greater effect on the catalytic activity of PSZ than that of PSZA and PSZAY.…”

“…Hua and Sommer [9] once investigated the calcination temperature of sulfated Zr(OH) 4 -Al(OH) 3 on nbutane isomerization activity over Pt/SO 4 2− /ZrO 2 -Al 2 O 3 (PSZA) and found that the optimized calcination temperature was 650 • C, in agreement with the previous investigation results from our groups [10]. Signoretto et al [11] also reported the optimal calcination temperature of sulfated Zr(OH) 4 modified with Ga 2 O 3 which depended on the content of Ga 2 O 3 promoter.…”

“…The effect of calcination temperature of sulfated Zr(OH) 4 or sulfated Zr(OH) 4 modified with Al on catalytic activity in hydroisomerization of n-alkane has been reported in previous investigation [8][9][10]. However, comparison between the effect of calcination temperature on the isomerization catalytic activity of PSZ, PSZA and PSZAY is rarely reported up to now.…”

“…It is generally believed that the high isomerization activity of SZ and PSZ could be obtained only when amorphous zirconium hydroxide acted as the precursor of sulfation. In the preparing process of SZ and PSZ, the high calcination temperature was considered to be indispensable [7] and it strongly affected the catalytic activity of SZ and PSZ to a great extent [8][9][10][11][12][13]. The results from Arata et al [12] and Sun et al [13] indicated that the calcination temperature effect on the isomerization activity of SZ depended on the preparation method to some extent.…”

n-pentane isomerization over Pt-Al promoted sulfated zirconia nanocatalyst

“…have been widely studied in alkane isomerization [4,5,[8][9][10]. Studies on the employed catalysts for this reaction showed that Sulfated Zirconia (SZ), as an environmentally friendly catalyst, was believed to be the most promising catalyst among the solid acids due to low-temperature hydrocarbon skeletal rearrangements for thermodynamic consideration [6,7,[10][11][12].…”