TY - JOUR
T1 - A size-selective method for increasing the performance of Pt supported on tungstated zirconia catalysts for alkane isomerization
T2 - a combined experimental and theoretical DFT study
AU - Vera-Iturriaga, J.
AU - Madrigal-Carrillo, K. G.
AU - Hernández-Pichardo, M. L.
AU - Rodríguez, Juan I.
AU - Jiménez-Izal, E.
AU - Montoya de la Fuente, J. A.
N1 - Publisher Copyright:
© The Royal Society of Chemistry and the Centre National de la Recherche Scientifique 2021.
PY - 2021/6/21
Y1 - 2021/6/21
N2 - The trends in the development of acid catalysts for isomerization show that the diffusion and accessibility of products are more favored in mesoporous as compared to microporous materials. In this work, an easy metal alkoxide- and surfactant-free technique was developed to prepare mesoporous size-selective Pt/WO3-ZrO2catalysts. A high-octane number blend was obtained in thenC6isomerization reaction with these catalysts. The use of H2O2produced an increase in the textural properties of the tungstated zirconia that generated a high expulsion of tungsten, significantly benefitting the development of Brønsted acid sites required in alkane isomerization reactions. Results show that these catalysts reached high conversion values (up to 85 mol%) and higher selectivity for bi-ramified isomers as compared to conventional tungstated zirconia (17 mol% for 2,2-dimethyl-butane and 13 mol% for 2,3-dimethyl-butane). The high catalytic activity is attributed to their improved mesoporous structure that allowed the formation of well-dispersed WOxclusters on the zirconia surface with an intermediate domain size. DFT calculations confirmed that intermediate WOxcluster sizes offer the best balance between the strength and number of Brønsted acid sites.
AB - The trends in the development of acid catalysts for isomerization show that the diffusion and accessibility of products are more favored in mesoporous as compared to microporous materials. In this work, an easy metal alkoxide- and surfactant-free technique was developed to prepare mesoporous size-selective Pt/WO3-ZrO2catalysts. A high-octane number blend was obtained in thenC6isomerization reaction with these catalysts. The use of H2O2produced an increase in the textural properties of the tungstated zirconia that generated a high expulsion of tungsten, significantly benefitting the development of Brønsted acid sites required in alkane isomerization reactions. Results show that these catalysts reached high conversion values (up to 85 mol%) and higher selectivity for bi-ramified isomers as compared to conventional tungstated zirconia (17 mol% for 2,2-dimethyl-butane and 13 mol% for 2,3-dimethyl-butane). The high catalytic activity is attributed to their improved mesoporous structure that allowed the formation of well-dispersed WOxclusters on the zirconia surface with an intermediate domain size. DFT calculations confirmed that intermediate WOxcluster sizes offer the best balance between the strength and number of Brønsted acid sites.
UR - http://www.scopus.com/inward/record.url?scp=85107960696&partnerID=8YFLogxK
U2 - 10.1039/d1nj01725j
DO - 10.1039/d1nj01725j
M3 - Artículo
AN - SCOPUS:85107960696
SN - 1144-0546
VL - 45
SP - 10510
EP - 10523
JO - New Journal of Chemistry
JF - New Journal of Chemistry
IS - 23
ER -