Gold Catalysts Synthesized Using a Modified Incipient Wetness Impregnation Method for Propylene Epoxidation

Zheng Lu; Jacob Kunisch; Zhuoran Gan; Muntaseer Bunian; Tianpin Wu; Yu Lei

doi:10.1002/cctc.202001053

Gold Catalysts Synthesized Using a Modified Incipient Wetness Impregnation Method for Propylene Epoxidation

Zheng Lu, Jacob Kunisch, Zhuoran Gan, Muntaseer Bunian, Tianpin Wu, Yu Lei

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

Propylene epoxidation in the presence of oxygen and hydrogen were measured for a series of Au/TS-1 catalysts prepared by a modified incipient wetness impregnation (mIWI) method. This method enables precise control of the Au : Ti ratio in the Au/TS-1 catalysts. The optimized Au/TS-1 catalyst exhibited 12 % propylene conversion, 87 % PO selectivity, and 25 % hydrogen efficiency. The particle size of gold nanoparticles prepared by the modified IWI was between 2 and 3 nm, as demonstrated by XRD patterns, STEM images, and X-ray absorption spectroscopy at the Au L₃ edge. XPS spectra showed that the surface species on the catalysts were similar. UV-Vis spectra suggested that in the modified IWI method, the chlorine ligands in Au(Cl)₄⁻ were replaced by hydroxyl groups, which contributes to form small gold nanoparticles. Kinetic studies showed that the active sites of Au(mIWI)/TS-1 are similar to the Au(DP)/TS-1 prepared by deposition precipitation.

Original language	English
Pages (from-to)	5993-5999
Number of pages	7
Journal	ChemCatChem
Volume	12
Issue number	23
DOIs	https://doi.org/10.1002/cctc.202001053
State	Published - Dec 4 2020
Externally published	Yes

Funding

This work is sponsored by the National Science Foundation (Grant # CBET‐1511820 and CBET‐1510485). Z. G. gratefully acknowledges a fellowship from Alabama EPSCoR Graduate Research Scholars Program. We thank Kavini Rathnayake for taking the ATR‐FTIR spectra. This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE‐AC02‐06CH11357.

Funders	Funder number
Alabama EPSCoR
National Science Foundation	CBET‐1510485, 1511820, CBET‐1511820
U.S. Department of Energy
Office of Science
Argonne National Laboratory	DE‐AC02‐06CH11357

Keywords

catalyst synthesis
hydrogen peroxide
precious metal catalyst
selective oxidation
TS-1

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title = "Gold Catalysts Synthesized Using a Modified Incipient Wetness Impregnation Method for Propylene Epoxidation",

abstract = "Propylene epoxidation in the presence of oxygen and hydrogen were measured for a series of Au/TS-1 catalysts prepared by a modified incipient wetness impregnation (mIWI) method. This method enables precise control of the Au : Ti ratio in the Au/TS-1 catalysts. The optimized Au/TS-1 catalyst exhibited 12 % propylene conversion, 87 % PO selectivity, and 25 % hydrogen efficiency. The particle size of gold nanoparticles prepared by the modified IWI was between 2 and 3 nm, as demonstrated by XRD patterns, STEM images, and X-ray absorption spectroscopy at the Au L3 edge. XPS spectra showed that the surface species on the catalysts were similar. UV-Vis spectra suggested that in the modified IWI method, the chlorine ligands in Au(Cl)4− were replaced by hydroxyl groups, which contributes to form small gold nanoparticles. Kinetic studies showed that the active sites of Au(mIWI)/TS-1 are similar to the Au(DP)/TS-1 prepared by deposition precipitation.",

keywords = "catalyst synthesis, hydrogen peroxide, precious metal catalyst, selective oxidation, TS-1",

author = "Zheng Lu and Jacob Kunisch and Zhuoran Gan and Muntaseer Bunian and Tianpin Wu and Yu Lei",

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AU - Lu, Zheng

AU - Kunisch, Jacob

AU - Gan, Zhuoran

AU - Bunian, Muntaseer

AU - Wu, Tianpin

AU - Lei, Yu

PY - 2020/12/4

Y1 - 2020/12/4

N2 - Propylene epoxidation in the presence of oxygen and hydrogen were measured for a series of Au/TS-1 catalysts prepared by a modified incipient wetness impregnation (mIWI) method. This method enables precise control of the Au : Ti ratio in the Au/TS-1 catalysts. The optimized Au/TS-1 catalyst exhibited 12 % propylene conversion, 87 % PO selectivity, and 25 % hydrogen efficiency. The particle size of gold nanoparticles prepared by the modified IWI was between 2 and 3 nm, as demonstrated by XRD patterns, STEM images, and X-ray absorption spectroscopy at the Au L3 edge. XPS spectra showed that the surface species on the catalysts were similar. UV-Vis spectra suggested that in the modified IWI method, the chlorine ligands in Au(Cl)4− were replaced by hydroxyl groups, which contributes to form small gold nanoparticles. Kinetic studies showed that the active sites of Au(mIWI)/TS-1 are similar to the Au(DP)/TS-1 prepared by deposition precipitation.

AB - Propylene epoxidation in the presence of oxygen and hydrogen were measured for a series of Au/TS-1 catalysts prepared by a modified incipient wetness impregnation (mIWI) method. This method enables precise control of the Au : Ti ratio in the Au/TS-1 catalysts. The optimized Au/TS-1 catalyst exhibited 12 % propylene conversion, 87 % PO selectivity, and 25 % hydrogen efficiency. The particle size of gold nanoparticles prepared by the modified IWI was between 2 and 3 nm, as demonstrated by XRD patterns, STEM images, and X-ray absorption spectroscopy at the Au L3 edge. XPS spectra showed that the surface species on the catalysts were similar. UV-Vis spectra suggested that in the modified IWI method, the chlorine ligands in Au(Cl)4− were replaced by hydroxyl groups, which contributes to form small gold nanoparticles. Kinetic studies showed that the active sites of Au(mIWI)/TS-1 are similar to the Au(DP)/TS-1 prepared by deposition precipitation.

KW - catalyst synthesis

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KW - precious metal catalyst

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Gold Catalysts Synthesized Using a Modified Incipient Wetness Impregnation Method for Propylene Epoxidation

Abstract

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