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Title: Ozone-Activated Nanoporous Gold: A Stable and Storable Material for Catalytic Oxidation

Journal Article · · ACS Catalysis
 [1];  [1];  [2];  [2];  [1];  [1]
  1. Harvard Univ., Cambridge, MA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

We report a new method for facile and reproducible activation of nanoporous gold (npAu) materials of different forms for the catalytic selective partial oxidation of alcohols under ambient pressure, steady flow conditions. This method, based on the surface cleaning of npAu ingots with ozone to remove carbon documented in ultrahigh vacuum conditions, produces active npAu catalysts from ingots, foils, and shells by flowing an ozone/dioxygen mixture over the catalyst at 150 °C, followed by a temperature ramp from 50 to 150 °C in a flowing stream of 10% methanol and 20% oxygen. With this treatment, all three materials (ingots, foils, and shells) can be reproducibly activated, despite potential carbonaceous poisons resulting from their synthesis, and are highly active for the selective oxidation of primary alcohols over prolonged periods of time. The npAu materials activated in this manner exhibit catalytic behavior substantially different from those activated under different conditions previously reported. Once activated in this manner, they can be stored and easily reactivated by flow of reactant gases at 150 °C for a few hours. They possess improved selectivity for the coupling of higher alcohols, such as 1-butanol, and are not active for carbon monoxide oxidation. As a result, this ozone-treated npAu is a functionally new catalytic material.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Energy Frontier Research Centers (EFRC) (United States). Integrated Mesoscale Architectures for Sustainable Catalysis (IMASC)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC52-07NA27344; SC0012573
OSTI ID:
1413171
Report Number(s):
LLNL-JRNL-737631
Journal Information:
ACS Catalysis, Vol. 5, Issue 7; ISSN 2155-5435
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 71 works
Citation information provided by
Web of Science

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Cited By (14)

New Architectures for Designed Catalysts: Selective Oxidation using AgAu Nanoparticles on Colloid-Templated Silica journal November 2017
Dealloyed Nanoporous Gold Catalysts: From Macroscopic Foams to Nanoparticulate Architectures journal May 2018
One-step synthesis of CuO@brass foil by dealloying method for low-cost flexible supercapacitor electrodes journal May 2016
Dynamic restructuring drives catalytic activity on nanoporous gold–silver alloy catalysts journal December 2016
Crossing the great divide between single-crystal reactivity and actual catalyst selectivity with pressure transients journal November 2018
Design of recyclable TEMPO derivatives bearing an ionic liquid moiety and N,N-bidentate group for highly efficient Cu( i )-catalyzed conversion of alcohols into aldehydes and imines journal January 2016
Imaging and chemically probing catalytic processes using field emission techniques: a study of NO hydrogenation on Pd and Pd–Au catalysts journal January 2017
CO adsorption and oxygen activation on group 11 nanoparticles – a combined DFT and high level CCSD(T) study about size effects and activation processes journal January 2018
Dealloyed porous gold anchored by in situ generated graphene sheets as high activity catalyst for methanol electro-oxidation reaction journal January 2020
Toward digitally controlled catalyst architectures: Hierarchical nanoporous gold via 3D printing journal August 2018
Atom Probe Tomography for Catalysis Applications: A Review journal July 2019
Aerobic Methanol Oxidation over Unsupported Nanoporous Gold: The Influence of an Added Base journal May 2019
New Architectures for Designed Catalysts: Selective Oxidation using AgAu Nanoparticles on Colloid-Templated Silica journal November 2017
Evolution of steady-state material properties during catalysis: Oxidative coupling of methanol over nanoporous Ag0.03Au0.97 journal December 2019

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