TY - JOUR
T1 - Effects of calcination temperature and water-washing treatment on n-hexane hydroisomerization behavior of Pt-promoted sulfated zirconia based catalysts
AU - Song, Yueqin
AU - Tian, Jing
AU - Ye, Yurong
AU - Jin, Yaqing
AU - Zhou, Xiaolong
AU - Wang, Jin An
AU - Xu, Longya
N1 - Funding Information:
This work is supported by Young Scientist Fund Project from the National Natural Science Foundation of China (Grant No.: 21103049 ) and project of Instituto Politécnico Nacional, Mexico (Grant No.: IPN-SIP-20120229 ).
PY - 2013/9/1
Y1 - 2013/9/1
N2 - Synthesis of Pt-promoted sulfated zirconia catalyst Pt/SO4 2-/ZrO2 (designated as PSZ), Pt/SO4 2-/ZrO2-Al2O3 (designated as PSZA), and Pt/SO42-/ZrO2-Al2O 3-Y2O3 (designated as PSZAY) was reported. These catalysts were characterized by N2 adsorption-desorption, thermal gravimetric (TG) analysis, NH3-temperature programmed desorption (NH3-TPD), and H2-temperature programmed reduction (H2-TPR) techniques. Effects of calcination temperature of the catalysts on the n-hexane hydroisomerization behavior were investigated in details. The experiment results revealed that the addition of Al and Y or Al promoter alone could improve the thermal stability of the catalysts. PSZA and PSZAY exhibited higher isomerization activity than unmodified PSZ as the calcination temperature of sulfated Zr(OH)4 was relatively high, for example, between 650 C and 750 C. For the first time, it was found that water-washing treatment of PSZA and PSZAY at different preparation stages had considerably different impacts on their catalytic activity. Water-washing after calcination of the sulfated Zr(OH)4, the catalytic activity of PSZA and PSZAY was high, as indicated by approximately 80% of n-hexane conversion. However, water-washing before calcination of sulfated Zr(OH)4 led to a significant decrease in the catalytic activity of PSZA and PSZAY, that is, the n-hexane conversion diminished to around 35%. It was proposed that the presence of excessive sulfur species over sample was favorable for keeping the active sulfur species in the catalyst surface.
AB - Synthesis of Pt-promoted sulfated zirconia catalyst Pt/SO4 2-/ZrO2 (designated as PSZ), Pt/SO4 2-/ZrO2-Al2O3 (designated as PSZA), and Pt/SO42-/ZrO2-Al2O 3-Y2O3 (designated as PSZAY) was reported. These catalysts were characterized by N2 adsorption-desorption, thermal gravimetric (TG) analysis, NH3-temperature programmed desorption (NH3-TPD), and H2-temperature programmed reduction (H2-TPR) techniques. Effects of calcination temperature of the catalysts on the n-hexane hydroisomerization behavior were investigated in details. The experiment results revealed that the addition of Al and Y or Al promoter alone could improve the thermal stability of the catalysts. PSZA and PSZAY exhibited higher isomerization activity than unmodified PSZ as the calcination temperature of sulfated Zr(OH)4 was relatively high, for example, between 650 C and 750 C. For the first time, it was found that water-washing treatment of PSZA and PSZAY at different preparation stages had considerably different impacts on their catalytic activity. Water-washing after calcination of the sulfated Zr(OH)4, the catalytic activity of PSZA and PSZAY was high, as indicated by approximately 80% of n-hexane conversion. However, water-washing before calcination of sulfated Zr(OH)4 led to a significant decrease in the catalytic activity of PSZA and PSZAY, that is, the n-hexane conversion diminished to around 35%. It was proposed that the presence of excessive sulfur species over sample was favorable for keeping the active sulfur species in the catalyst surface.
KW - Calcination temperature
KW - Hydroisomerization
KW - Promoter
KW - Sulfated zirconia
KW - Water washing
UR - http://www.scopus.com/inward/record.url?scp=84879915829&partnerID=8YFLogxK
U2 - 10.1016/j.cattod.2012.07.024
DO - 10.1016/j.cattod.2012.07.024
M3 - Artículo
AN - SCOPUS:84879915829
SN - 0920-5861
VL - 212
SP - 108
EP - 114
JO - Catalysis Today
JF - Catalysis Today
ER -