TY - JOUR
T1 - Synthesis and physico-chemical characterization of ceo 2/zro 2-so 42-mixed oxides
AU - Hernández-Enríquez, Juan Manuel
AU - Silva-Rodrigo, Rebeca
AU - García-Alamilla, Ricardo
AU - García-Serrano, Luz Arcelia
AU - Handy, Brent Edward
AU - Cárdenas-Galindo, Guadalupe
AU - Cueto-Hernández, Arturo
PY - 2012/4
Y1 - 2012/4
N2 - Environmentally friendly solid-acid catalysts CeO 2/ZrO 2-SO 4 2- were prepared by the sol gel method varying CeO 2 content (10, 20 and 30 wt%) and using sulfation in situ, maintaining the sulfate ions amount present in the materials at 20 wt%. ZrO 2 and ZrO 2-SO 4 2-were also prepared for comparison proposes using the same synthesis method. The materials were characterized by X-ray diffraction, nitrogen physisorption, potentiometric titration with n-butylamine, decomposition of 2-propanol and n-pentane isomerization. The specific surface area of ZrO 2-SO 4 2- was high (160 m 2/g) compared with the unmodified ZrO 2 (80 m 2/g), however this area decreased with increasing the CeO 2 content (37-100 m 2/g). There was no significant effect of CeO 2 on the tetragonal structure of ZrO 2-SO 4 2-. The variation of acid sites amount runs parallel to the change of specific surface area. The acid sites amount decreased with increasing cerium oxide content. The decomposition of 2-propanol results fundamentally in the formation of dehydration products such as propylene and diisopropyl ether, both involving acid sites. In addition, a good performance during the n-pentane isomerization was observed for these materials. The selectivity towards isopentane reaches 84% when the Pt/CeO 2/ZrO 2-SO 4 2- catalyst with the highest CeO 2 content was used.
AB - Environmentally friendly solid-acid catalysts CeO 2/ZrO 2-SO 4 2- were prepared by the sol gel method varying CeO 2 content (10, 20 and 30 wt%) and using sulfation in situ, maintaining the sulfate ions amount present in the materials at 20 wt%. ZrO 2 and ZrO 2-SO 4 2-were also prepared for comparison proposes using the same synthesis method. The materials were characterized by X-ray diffraction, nitrogen physisorption, potentiometric titration with n-butylamine, decomposition of 2-propanol and n-pentane isomerization. The specific surface area of ZrO 2-SO 4 2- was high (160 m 2/g) compared with the unmodified ZrO 2 (80 m 2/g), however this area decreased with increasing the CeO 2 content (37-100 m 2/g). There was no significant effect of CeO 2 on the tetragonal structure of ZrO 2-SO 4 2-. The variation of acid sites amount runs parallel to the change of specific surface area. The acid sites amount decreased with increasing cerium oxide content. The decomposition of 2-propanol results fundamentally in the formation of dehydration products such as propylene and diisopropyl ether, both involving acid sites. In addition, a good performance during the n-pentane isomerization was observed for these materials. The selectivity towards isopentane reaches 84% when the Pt/CeO 2/ZrO 2-SO 4 2- catalyst with the highest CeO 2 content was used.
KW - Acid-base properties
KW - Mixed oxides
KW - Physico-chemical characterization
KW - Sol-gel method
KW - Sulfation
UR - http://www.scopus.com/inward/record.url?scp=84864677798&partnerID=8YFLogxK
M3 - Artículo
SN - 1870-249X
VL - 56
SP - 115
EP - 120
JO - Journal of the Mexican Chemical Society
JF - Journal of the Mexican Chemical Society
IS - 2
ER -