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通过添加CeO提高Au/NiAl层状双氢氧化物纳米结构催化剂的水煤气变换性能

Improved Water-Gas Shift Performance of Au/NiAl LDHs Nanostructured Catalysts via CeO Addition.

作者信息

Gabrovska Margarita, Ivanov Ivan, Nikolova Dimitrinka, Krstić Jugoslav, Venezia Anna Maria, Crişan Dorel, Crişan Maria, Tenchev Krassimir, Idakiev Vasko, Tabakova Tatyana

机构信息

Institute of Catalysis, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria.

Department of Catalysis and Chemical Engineering, Institute of Chemistry, Technology and Metallurgy, University of Belgrade, 11000 Belgrade, Serbia.

出版信息

Nanomaterials (Basel). 2021 Feb 2;11(2):366. doi: 10.3390/nano11020366.

DOI:10.3390/nano11020366
PMID:33540532
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7912797/
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.

摘要

研究了共沉淀纳米级镍铝层状双氢氧化物（LDHs）负载的金作为中温水煤气变换（WGS）反应的有效催化剂，该工业催化过程传统上用于减少合成气中CO的含量并生产纯氢。本研究的目的是通过CeO改性来提高Au/NiAl催化剂的性能。开发了一种基于用1M NaOH沉淀Ce离子直接在NiAl-LDH上沉积二氧化铈（1、3或5 wt.%）的创新方法。所提出的方法使我们能够获得CeO相并通过避免煅烧处理来保留NiAl层状结构。通过沉积沉淀法进行含Au样品的合成。为了阐明Au和CeO负载量对催化剂的结构、相组成、织构和电子性质以及活性的影响，对制备好的和经过WGS测试的样品进行了X射线粉末衍射、N物理吸附和X射线光电子能谱表征。通过程序升温还原评估所研究样品的还原行为。CeO的添加对Au/NiAl催化剂的WGS性能有显著影响。通过比较3 wt.% CeO改性的和不含二氧化铈的Au/NiAl样品在220°C时达到的CO转化率（分别为98.8%和83.4%），揭示了二氧化铈的有利作用。可以说，通过添加CeO调节Au/NiAl LDH的性能，由于创新的合成方法和改进的WGS性能，为催化剂提供了实际应用的可能性。

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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ecb5/7912797/fcbe0c2f3297/nanomaterials-11-00366-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ecb5/7912797/51196860cd44/nanomaterials-11-00366-g007a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ecb5/7912797/738017172413/nanomaterials-11-00366-g008a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ecb5/7912797/ab32d3daf634/nanomaterials-11-00366-g009.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ecb5/7912797/9ed3adf368bf/nanomaterials-11-00366-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ecb5/7912797/201697c61c3a/nanomaterials-11-00366-g012a.jpg

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