Selective Hydrogenation of Citral Over Supported Pt Catalysts: Insight into Support Effects

Abstract

Highly dispersed platinum (Pt) nanoparticles (NPs) were deposited on various substrates by atomic layer deposition (ALD) in a fluidized bed reactor at 300°C. The substrates included multi-walled carbon nanotubes (MWCNTs), silica gel (SiO2), commercial γ-Al2O3, and ALD-prepared porous Al2O3 particles (ALD-Al2O3). The results of TEM analysis showed that ∼1.3 nm Pt NPs were highly dispersed on all different supports. All catalysts were used for the reaction of selective hydrogenation of citral to unsaturated alcohols (UA), geraniol, and nerol. Both the structure and acidity of supports affected the activity and selectivity of Pt catalysts. Pt/SiO2 showed the highest activity due to the strong acidity of SiO2 and the conversion of citral reached 82% after 12 h with a selectivity of 58% of UA. Pt/MWCNTs showed the highest selectivity of UA, which reached 65% with a conversion of 38% due to its unique structure and electronic effect. The cycling experiments indicated that Pt/MWCNTs and Pt/ALD-Al2O3 catalysts were more stable than Pt/SiO2, as a result of the different interactions between the Pt NPs and the supports.

Department(s)

Chemical and Biochemical Engineering

Keywords and Phrases

Alcohols; Aluminum; Atomic Layer Deposition (ALD); Carbon; Catalyst Selectivity; Catalysts; Chemical Reactors; Convergence of Numerical Methods; Deposition; Fluid Catalytic Cracking; Fluidized Beds; Hydrogenation; Monoterpenes; Multiwalled Carbon Nanotubes (MWCN); Platinum (Pt); Silica Gel; Substrates; Yarn; Citral Hydrogenation; Electronic Effects; Fluidized Bed Reactors; Nano-Structured Catalyst; Nanoparticle (NPs); Selective Hydrogenation; Unsaturated Alcohols (UA); Various Substrates; Catalyst Supports; Alcohol; Geraniol; Multi Walled Nanotube; Nerol; Platinum Nanoparticle; Acidity; Chemical Structure; Controlled Study; Dispersion; Fluidized Bed Reactor; Hydrogenation; Nanocatalyst; Nanostructured Catalysts; Stability; Supports

International Standard Serial Number (ISSN)

1388-0764; 1572-896X

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2017 Springer Verlag, All rights reserved.

Publication Date

01 Apr 2017

Link to Full Text

Share

 
COinS