AI Article Synopsis

  • The study investigates the use of supported gold on co-precipitated nanosized NiAl layered double hydroxides as a catalyst for the medium-temperature water-gas shift (WGS) reaction, aimed at reducing CO levels and producing pure hydrogen.
  • An innovative method was developed to directly deposit ceria (CeO) on NiAl-LDH without calcination, enhancing the catalyst's performance.
  • Results showed that adding 3 wt.% CeO significantly improved CO conversion at 220 °C, demonstrating that CeO-modified Au/NiAl catalysts could be effectively used in practical applications due to their enhanced properties and synthesis method.

Article Abstract

Supported gold on co-precipitated nanosized NiAl layered double hydroxides (LDHs) was studied as an effective catalyst for medium-temperature water-gas shift (WGS) reaction, an industrial catalytic process traditionally applied for the reduction in the amount of CO in the synthesis gas and production of pure hydrogen. The motivation of the present study was to improve the performance of the Au/NiAl catalyst via modification by CeO. An innovative approach for the direct deposition of ceria (1, 3 or 5 wt.%) on NiAl-LDH, based on the precipitation of Ce ions with 1M NaOH, was developed. The proposed method allows us to obtain the CeO phase and to preserve the NiAl layered structure by avoiding the calcination treatment. The synthesis of Au-containing samples was performed through the deposition-precipitation method. The as-prepared and WGS-tested samples were characterized by X-ray powder diffraction, N-physisorption and X-ray photoelectron spectroscopy in order to clarify the effects of Au and CeO loading on the structure, phase composition, textural and electronic properties and activity of the catalysts. The reduction behavior of the studied samples was evaluated by temperature-programmed reduction. The WGS performance of Au/NiAl catalysts was significantly affected by the addition of CeO. A favorable role of ceria was revealed by comparison of CO conversion degree at 220 °C reached by 3 wt.% CeO-modified and ceria-free Au/NiAl samples (98.8 and 83.4%, respectively). It can be stated that tuning the properties of Au/NiAl LDH via CeO addition offers catalysts with possibilities for practical application owing to innovative synthesis and improved WGS performance.

Download full-text PDF

Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7912797PMC
http://dx.doi.org/10.3390/nano11020366DOI Listing

Publication Analysis

Top Keywords

performance au/nial
12
water-gas shift
8
ceo addition
8
nial layered
8
wgs performance
8
ceo
6
au/nial
5
improved water-gas
4
performance
4
shift performance
4

Similar Publications

Supported gold on co-precipitated nanosized NiAl layered double hydroxides (LDHs) was studied as an effective catalyst for medium-temperature water-gas shift (WGS) reaction, an industrial catalytic process traditionally applied for the reduction in the amount of CO in the synthesis gas and production of pure hydrogen. The motivation of the present study was to improve the performance of the Au/NiAl catalyst via modification by CeO. An innovative approach for the direct deposition of ceria (1, 3 or 5 wt.

View Article and Find Full Text PDF

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!

A PHP Error was encountered

Severity: Notice

Message: fwrite(): Write of 34 bytes failed with errno=28 No space left on device

Filename: drivers/Session_files_driver.php

Line Number: 272

Backtrace:

A PHP Error was encountered

Severity: Warning

Message: session_write_close(): Failed to write session data using user defined save handler. (session.save_path: /var/lib/php/sessions)

Filename: Unknown

Line Number: 0

Backtrace: