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Role of the Mg/Al atomic ratio in hydrotalcite-supported Pd/Sn catalysts for nitrate adsorption and hydrogenation reduction

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Abstract.
Hydrotalcite-supported Pd/Sn catalysts with different Mg/Al atomic ratios (2, 3, 4, and 5) for nitrate
adsorption and hydrogenation reduction were successfully synthesized by a coprecipitation method. The
results showed that different atomic ratios of Mg/Al resulted in different interlayer spacings and zetapotentials of the catalysts, which thus influenced its adsorption capacity. With the increase of Mg/Al
atomic ratio, the interlayer spacing rose and zeta-potential decreased. The adsorption properties of the
catalysts were mainly affected by interlayer spacing when Mg/Al atomic ratios increased from 2 to 4.
However, when Mg/Al atomic ratios further increased from 4 to 5, there was a negative impact on
the adsorption properties of zeta-potential. Also, the adsorption capacity of the catalysts for nitrate
followed the order: Mg/Al = 2 < Mg/Al = 3 < Mg/Al = 5 < Mg/Al = 4. In the catalytic reduction process,
the adsorbed nitrates were further reduced to nitrites that remained in the same position in catalysts,
but some of superabundant nitrites were released into water as primary and unstable products. The
concentration of released nitrites was in the reverse order of the adsorption capacity. The catalytic
selectivity and activity of the catalysts for nitrate reduction had the same sequence as its adsorption
capacity.

Keywords:
Mg/Al atomic ratio
Hydrotalcite
Nitrate
Hydrogenation
Adsorption
Reduction
Nitrite

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Informasi Detail

Judul Seri

Journal of Colloid and Interface Science

No. Panggil

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Penerbit

London : Elsevier Inc.., 2009

Deskripsi Fisik

Journal of Colloid and Interface Science 332 (2009) 151–157

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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