Palladium Supported on Mesoporous Alumina Catalyst for Selective Hydrogenation

Bahri‐Laleh

et al. 2019

Applied Organom Chemis

Taking advantage of computational chemistry, the best diamine for the synthesis of a multi‐dentate ligand from the reaction with 3‐(trimethoxysilyl) propylisocyanate (TEPI) was selected. Actually, predictive Density Functional Theory (DFT) calculations provided the right diamino chain, i.e. ethylenediamine, capable to sequester a palladium atom, together with the relatively polar solvent toluene, and then undergo the experiments as a selective catalytic agent. The ligand was then prepared and applied for the decoration of the halloysite (Hal) outer surface to furnish an efficient support for the immobilization of Pd nanoparticles. The resulting catalyst exhibited high catalytic activity for hydrogenation of nitroarenes. Moreover, it showed high selectivity towards nitro functional group. The study of the catalyst recyclability confirmed that the catalyst could be recycled for several reaction runs with only slight loss of the catalytic activity and Pd leaching. Hot filtration test also proved the heterogeneous nature of the catalysis.

Section: Resultsmentioning

confidence: 99%

Study of the effect of the ligand structure on the catalytic activity of Pd@ ligand decorated halloysite: Combination of experimental and computational studies

Dehghani

Bahri‐Laleh

et al. 2019

Applied Organom Chemis

“… Entry Catalyst Temp. (°C) Solvent Time (min) H2 Pressure Yield (%) Reference 1 Pd/B-CP-HIm (0.03 g) 50 H 2 O: EtOH (1:1) 120 1 atm 100 This work 2 Pd/PPh3@FDU‐12 (8.33 × 10 –4 mmol Pd) 40 EtOH 60 10 bar 99 30 3 APSNP a (1 mol%) r.t EtOH 120 40 atm 100 31 4 Pd@Per-P b (0.03 g) 45 H 2 O: EtOH (1:1) 90 1 atm 98 32 5 Pd@CS-CD-MGQDs c (0.5 mol%) 50 H 2 O 60 1 atm 97 33 6 PdNP(0.5%)/Al 2 O 3 (0.3 g) r.t THF 180 1 atm 100 34 7 …”

Section: Resultsmentioning

confidence: 99%

Pd on cyclotriphosphazen-hexa imine decorated boehmite as an efficient catalyst for hydrogenation of nitro arenes under mild reaction condition

Abedian-Dehaghani

Heravi

2022

Sci Rep

Cyclotriphosphazen-hexa imine ligand was prepared through successive reactions of phosphonitrilchloride trimer with 4-hydroxybenzaldehyde and (3-aminopropyl) triethoxy silane. The as-prepared ligand was then covalently grafted on boehmite to furnish an efficient support for the immobilization of Pd nanoparticles and synthesis of a novel heterogeneous catalyst for hydrogenation of nitro arenes. The catalytic tests revealed that the catalyst had excellent catalytic activity for hydrogenation of various nitro arenes with different steric and electronic features under mild reaction condition in aqueous media. Noteworthy, the catalyst was highly selective and in the substrates with ketone or aldehyde functionalities, reduction of nitro group was only observed. The catalyst was also recyclable and only slight loss of activity was detected after each recycling run. Hot filtration test also approved true heterogeneous nature of catalysis.

Salep as a biological source for the synthesis of biochar with utility for the catalysis

Heravi

Kahangi

2019

Applied Organom Chemis

Hydrothermal carbonization of salep as a domestic biosource was carried out to afford a biochar, BC, with exceptional catalytic activity. BC can be further magnetized by incorporation of magnetic nanoparticles to furnish a magnetic catalyst, BC‐Fe, with improved recovery and recyclability for the hydrogenation of nitroarenes in the absence of any precious metal. BC‐Fe was also applied as a catalyst support for the immobilization of Pd nanoparticles and development of an efficient, biocompatible and cost‐effective catalyst, Pd@BC‐Fe, with utility for the oxidation of benzyl alcohols under mild reaction condition in a selective manner to afford corresponding acids in high yields. The study of the recyclability of the catalyst confirmed high recyclability of Pd@BC‐Fe.