6117-91-5Relevant articles and documents
Probing the Interface between Encapsulated Nanoparticles and Metal-Organic Frameworks for Catalytic Selectivity Control
Lo, Wei-Shang,Chou, Lien-Yang,Young, Allison P.,Ren, Chenhao,Goh, Tian Wei,Williams, Benjamin P.,Li, Yang,Chen, Sheng-Yu,Ismail, Mariam N.,Huang, Wenyu,Tsung, Chia-Kuang
, (2021/02/16)
Encapsulating metal nanoparticles (NPs) in metal-organic frameworks (MOFs) to control catalytic selectivity has recently attracted great attention; however, an understanding of the NP-MOF interface is lacking. In this work, we used spectroscopy to investi
Metal-doped mesoporous ZrO2catalyzed chemoselective synthesis of allylic alcohols from Meerwein-Ponndorf-Verley reduction of α,β-unsaturated aldehydes
Akinnawo, Christianah Aarinola,Bingwa, Ndzondelelo,Meijboom, Reinout
, p. 7878 - 7892 (2021/05/13)
Meerwein-Ponndorf-Verley reduction (MPVr) is a sustainable route for the chemoselective transformation of α,β-unsaturated aldehydes. However, tailoring ZrO2 catalysts for improved surface-active sites and maximum performance in the MPV reaction is still a challenge. Here, we synthesized mesoporous zirconia (ZrO2) and metal-doped zirconia (M_ZrO2, M = Cr, Mn, Fe, and Ni). The incorporation of metal dopants into zirconia's crystal framework alters its physico-chemical properties such as surface area and total acidity-basicity. The prepared catalysts were evaluated in the MPVr using 2-propanol as a hydrogen donor under mild reaction conditions. The catalysts' remarkable reactivity depends mainly on their surface mesostructure's intrinsic properties rather than the specific surface area. Cr_ZrO2, which is stable and sustainable, presented superior activity and 100% selectivity to unsaturated alcohols. The synergistic effect between Cr and Zr species in the binary oxide facilitated the Lewis acidity-induced performance of the Cr_ZrO2 catalyst. Our work presents the first innovative application of a well-designed mesoporous Cr_ZrO2 in the green synthesis of unsaturated alcohols with exceptional reactivity. This journal is
Thermal Unequilibrium of PdSn Intermetallic Nanocatalysts: From In Situ Tailored Synthesis to Unexpected Hydrogenation Selectivity
Chen, Minda,Dolge, Kevin,Gebre, Mebatsion,Heintz, Patrick,Huang, Wenyu,Jing, Dapeng,Lamkins, Andrew,Liu, Fudong,Ordonez, Claudio,Qi, Long,Shoemaker, Daniel P.,Wang, Bin,Yan, Yu,Zhang, Biying
supporting information, p. 18309 - 18317 (2021/07/20)
Effective control on chemoselectivity in the catalytic hydrogenation of C=O over C=C bonds is uncommon with Pd-based catalysts because of the favored adsorption of C=C bonds on Pd surface. Here we report a unique orthorhombic PdSn intermetallic phase with unprecedented chemoselectivity toward C=O hydrogenation. We observed the formation and metastability of this PdSn phase in situ. During a natural cooling process, the PdSn nanoparticles readily revert to the favored Pd3Sn2 phase. Instead, using a thermal quenching method, we prepared a pure-phase PdSn nanocatalyst. PdSn shows an >96 % selectivity toward hydrogenating C=O bonds of various α,β-unsaturated aldehydes, highest in reported Pd-based catalysts. Further study suggests that efficient quenching prevents the reversion from PdSn- to Pd3Sn2-structured surface, the key to the desired catalytic performance. Density functional theory calculations and analysis of reaction kinetics provide an explanation for the observed high selectivity.
