TY - JOUR
T1 - ZnO-Al2O3-La2O3 layered double hydroxides as catalysts precursors for the esterification of oleic acid fatty grass at low temperature
AU - Tzompantzi,
AU - Carrera, Y.
AU - Morales-Mendoza, G.
AU - Valverde-Aguilar, G.
AU - Mantilla, A.
N1 - Funding Information:
The authors thank the support from PROMEP 12411240, SIP 20121639 and CONACyT 169157 projects. Our acknowledge to Jaqueline Cañetas-Ortega (SEM) from Instituto de Física, UNAM and Diego Quiterio (preparation of samples for SEM) for their technical assistance.
PY - 2013/9/1
Y1 - 2013/9/1
N2 - ZnO-Al2O3-La2O3 layered double hydroxides were synthesized by the coprecipitation method and calcined at 400 C in order to obtain the corresponding mixed oxides. XRD patterns showed lamellar type materials in fresh solids (dried) while for calcined samples the characteristic mixed oxides and zincite peaks were observed. After calcination, high specific surface areas (180-130 m2/g) were obtained in the mixed oxides. TPD-CO2 denotes a shift in the CO2 desorption peak to highest temperature in the samples containing La3+. In the oleic acid esterification with methanol, under soft reaction conditions (100 C and 6 atm), ZnAlLa mixed oxides reached conversions of 75% to the ester after 15 min and higher than 88% after 1 h of reaction.
AB - ZnO-Al2O3-La2O3 layered double hydroxides were synthesized by the coprecipitation method and calcined at 400 C in order to obtain the corresponding mixed oxides. XRD patterns showed lamellar type materials in fresh solids (dried) while for calcined samples the characteristic mixed oxides and zincite peaks were observed. After calcination, high specific surface areas (180-130 m2/g) were obtained in the mixed oxides. TPD-CO2 denotes a shift in the CO2 desorption peak to highest temperature in the samples containing La3+. In the oleic acid esterification with methanol, under soft reaction conditions (100 C and 6 atm), ZnAlLa mixed oxides reached conversions of 75% to the ester after 15 min and higher than 88% after 1 h of reaction.
KW - Basicity of ZnO-AlO -LaO mixed oxides
KW - Oleic acid esterification
KW - ZnO-AlO-La O LDH
KW - ZnO-AlO-La O mixed oxides
UR - http://www.scopus.com/inward/record.url?scp=84879956406&partnerID=8YFLogxK
U2 - 10.1016/j.cattod.2012.12.017
DO - 10.1016/j.cattod.2012.12.017
M3 - Artículo
AN - SCOPUS:84879956406
SN - 0920-5861
VL - 212
SP - 164
EP - 168
JO - Catalysis Today
JF - Catalysis Today
ER -