Lowering the operating temperature of gold acetylene hydrochlorination catalysts using oxidized carbon supports

DOI: 10.1021/acscatal.2c04242

Authors: Samuel Pattisson (Cardiff Catalysis Institute, Cardiff University) , Simon R. Dawson (Cardiff Catalysis Institute, Cardiff University) , Grazia Malta (Cardiff Catalysis Institute, Cardiff University) , Nicholas F. Dummer (Cardiff Catalysis Institute, Cardiff University) , Louise R. Smith (Cardiff Catalysis Institute, Cardiff University) , Anna Lazaridou (Cardiff Catalysis Institute, Cardiff University) , David J. Morgan (Cardiff Catalysis Institute, Cardiff University) , Simon J. Freakley (University of Bath) , Simon A. Kondrat (Cardiff Catalysis Institute, Cardiff University) , Joost J. Smit (Johnson Matthey) , Peter Johnston (Johnson Matthey) , Graham J. Hutchings (Cardiff Catalysis Institute, Cardiff University)
Co-authored by industrial partner: Yes

Type: Journal Paper
Journal: Acs Catalysis

State: Published (Approved)
Published: November 2022
Diamond Proposal Number(s): 15214 , 15151

Abstract: The commercialization of gold for acetylene hydrochlorination represents a major scientific landmark. The development of second-generation gold catalysts continues with a focus on derivatives and drop-in replacements with higher activity and stability. Here, we show the influence that the support surface oxygen has on the activity of carbon supported gold catalysts. Variation in the surface oxygen content of carbon is achieved through careful modification of the Hummers chemical oxidation method prior to the deposition of gold. All oxidized carbon-based catalysts resulted in a marked increase in activity at 200 °C when compared to the standard nontreated carbon, with an optimum oxygen content of ca. 18 at % being observed. Increasing oxygen and relative concentration of C–O functionality yields catalysts with light-off temperatures 30–50 °C below the standard catalyst. This understanding opens a promising avenue to produce high activity acetylene hydrochlorination catalysts that can operate at lower temperatures.

Journal Keywords: gold; acetylene; hydrochlorination; vinyl chloride; light-off

Subject Areas: Chemistry


Instruments: B18-Core EXAFS

Added On: 04/11/2022 08:45

Documents:
acscatal.2c04242.pdf

Discipline Tags:

Physical Chemistry Catalysis Chemistry

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS) Extended X-ray Absorption Fine Structure (EXAFS)