TY - JOUR
T1 - L-serine-functionalized montmorillonite decorated with Au nanoparticles
T2 - a new highly efficient catalyst for the reduction of 4-nitrophenol
AU - Rocha, Mariana
AU - Costa, Paula
AU - Sousa, Carlos A.D.
AU - Pereira, Clara
AU - Rodríguez-Borges, José E.
AU - Freire, Cristina
N1 - Funding Information:
This work was funded by Fundação para a Ciência e a Tecnologia (FCT)/MEC and FEDER under Program PT2020 (project UID/QUI/50006/2013-POCI/01/0145/FEDER/007265). M. Rocha and C.A.D. Sousa also thank FCT for the grants SFRH/BD/52529/2014 and SFRH/BPD/80100/2011, respectively. C. Pereira thanks FCT for the FCT Investigator contract IF/01080/2015.
Funding Information:
This work was funded by Fundação para a Ciência e a Tecnologia (FCT)/MEC and FEDER under Program PT2020 (project UID/QUI/50006/2013-POCI/01/0145/FEDER/007265 ). M. Rocha and C.A.D. Sousa also thank FCT for the grants SFRH/BD/52529/2014 and SFRH/BPD/80100/2011 , respectively. C. Pereira thanks FCT for the FCT Investigator contract IF/01080/2015.
Publisher Copyright:
© 2018 Elsevier Inc.
PY - 2018/5
Y1 - 2018/5
N2 - The conversion of nitroarenes to aminoarenes is of great industrial interest since they are prevalent pollutants in water and aminoarenes are important intermediates in the synthesis of pharmaceuticals, natural products and in bulk chemical production. In this work, two new catalysts for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) were prepared by immobilization of gold nanoparticles onto the surface of K10 montmorillonite clay (K10) functionalized with two new L-serine derivative organosilanes. Transmission electron microscopy showed the presence of 4–5 nm gold nanoparticles after catalysis. The reduction reaction of 4-NP to 4-AP at 25 °C, using NaBH4 as reducing agent, led to nearly 100% conversion in only 1 minute, presenting pseudo-first-order rate constants normalized for Au loading of K = 630 and 430 mmol−1 s−1. The catalysts showed high stability, leading to substrate conversions of 95–100% after 10 consecutive cycles, with negligible Au leaching.
AB - The conversion of nitroarenes to aminoarenes is of great industrial interest since they are prevalent pollutants in water and aminoarenes are important intermediates in the synthesis of pharmaceuticals, natural products and in bulk chemical production. In this work, two new catalysts for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) were prepared by immobilization of gold nanoparticles onto the surface of K10 montmorillonite clay (K10) functionalized with two new L-serine derivative organosilanes. Transmission electron microscopy showed the presence of 4–5 nm gold nanoparticles after catalysis. The reduction reaction of 4-NP to 4-AP at 25 °C, using NaBH4 as reducing agent, led to nearly 100% conversion in only 1 minute, presenting pseudo-first-order rate constants normalized for Au loading of K = 630 and 430 mmol−1 s−1. The catalysts showed high stability, leading to substrate conversions of 95–100% after 10 consecutive cycles, with negligible Au leaching.
KW - 4-Nitrophenol reduction
KW - Gold nanoparticles
KW - Heterogeneous catalysis
KW - K10 montmorillonite
KW - NaBH
UR - http://www.scopus.com/inward/record.url?scp=85043994941&partnerID=8YFLogxK
U2 - 10.1016/j.jcat.2018.02.027
DO - 10.1016/j.jcat.2018.02.027
M3 - Article
AN - SCOPUS:85043994941
SN - 0021-9517
VL - 361
SP - 143
EP - 155
JO - Journal of Catalysis
JF - Journal of Catalysis
ER -