TY - JOUR
T1 - Al- and Ga-promoted WO3/ZrO2 strong solid acid catalysts and their catalytic activities in n-butane isomerization
AU - Chen, Xiao Rong
AU - Chen, Chang Lin
AU - Xu, Nan Ping
AU - Mou, Chung Yuan
N1 - Funding Information:
We acknowledge the financial supports from the Science and Technology Department of Jiangsu Province (Project BG2002017), and the Key Laboratory of Material-Oriented Chemical Engineering of Jiangsu Province.
PY - 2004/9/1
Y1 - 2004/9/1
N2 - A series of Al- and Ga-promoted tungstated zirconia strong solid acid catalysts were prepared. The effect of Al2O3 and Ga 2O3 on the structural, acidic and redox features of WO3/ZrO2 (WZ) has been characterized by means of X-ray powder diffraction (XRD), N2 adsorption (BET), UV-visible diffuse reflectance spectra (UV-vis), infrared spectra (IR), NH3 temperature-programmed desorption (NH3-TPD) and H2 temperature-programmed reduction (H2-TPR). With respect to tungstated zirconia, the promoted catalysts stabilized the zirconia tetragonal phase, prevented crystalline WO3 growth. Al or Ga addition to WZ had less effect on the strength of the acid sites, but effected reduction temperature of WZ. The isomerization of n-butane was investigated at 300°C over tungstated zirconia and promoted catalysts. The promoted catalysts improved the isomerization conversion and stability in the presence of hydrogen. The best Al and Ga loading in these catalysts is around 0.5 and 1.0%, respectively, and the optimal calcination temperature is ∼850°C. The experiment results showed that Ga was a more efficient promoter than Al. Pt addition to promoted catalysts showed great improvement on the performance of selectivity and stability.
AB - A series of Al- and Ga-promoted tungstated zirconia strong solid acid catalysts were prepared. The effect of Al2O3 and Ga 2O3 on the structural, acidic and redox features of WO3/ZrO2 (WZ) has been characterized by means of X-ray powder diffraction (XRD), N2 adsorption (BET), UV-visible diffuse reflectance spectra (UV-vis), infrared spectra (IR), NH3 temperature-programmed desorption (NH3-TPD) and H2 temperature-programmed reduction (H2-TPR). With respect to tungstated zirconia, the promoted catalysts stabilized the zirconia tetragonal phase, prevented crystalline WO3 growth. Al or Ga addition to WZ had less effect on the strength of the acid sites, but effected reduction temperature of WZ. The isomerization of n-butane was investigated at 300°C over tungstated zirconia and promoted catalysts. The promoted catalysts improved the isomerization conversion and stability in the presence of hydrogen. The best Al and Ga loading in these catalysts is around 0.5 and 1.0%, respectively, and the optimal calcination temperature is ∼850°C. The experiment results showed that Ga was a more efficient promoter than Al. Pt addition to promoted catalysts showed great improvement on the performance of selectivity and stability.
KW - AlO/WO /ZrO
KW - Butane isomerization
KW - GaO/WO/ZrO
KW - Strong solid acid
KW - WO/ZrO
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U2 - 10.1016/j.cattod.2004.06.030
DO - 10.1016/j.cattod.2004.06.030
M3 - Conference article
AN - SCOPUS:4344665723
SN - 0920-5861
VL - 93-95
SP - 129
EP - 134
JO - Catalysis Today
JF - Catalysis Today
T2 - Selections from the Presentations of the 3rd Asia-Pacific Congress
Y2 - 12 October 2003 through 12 October 2003
ER -