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Citrate or hydrotalcite? As the precursor of Pt or Ru-doped Ni/Mg(Al)O catalyst for propane oxidative reforming

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Abstract.
Trace amounts of Pt- and Ru-doped Ni/Mg(Al)O catalysts were prepared by a citrate method and tested
in the oxidative reforming of C3H8 under daily start-up and shut-down (DSS) operation. The activity and
the sustainability of the catalysts were compared with those of the Pt- and Ru-doped Ni/Mg(Al)O
catalysts derived from hydrotalcite (HT) precursor. The DSS operation of C3H8 reforming was carried out
with O2 gas or O2/H2O mixed gas between 200 8C and 600 8C or 700 8C under air purging conditions. The
catalysts underwent steaming treatment with H2/H2O mixed gas at 900 8C for 10 h. This allowed us to
test the effect of Ni sintering on the catalyst deactivation. Coking was significantly suppressed on both
HT- and citrate-derived Ni catalysts. Although both preparations produced highly dispersed Ni particles
on the catalysts, the HT-derived catalysts exhibitedmore finely dispersed Ni particles, resulting in higher
activity values than those of the citrate-derived catalysts. The regenerative activity due to redispersion of
sintered Ni particles was enhanced over the HT-derived catalysts compared with the activity over
citrate-derived catalysts. Although a clear redispersion of Ni particles was not observed in the oxidative
reforming, i.e., in the absence of steam, the size decrease in Ni particles was more significant over the HTderived catalysts than over the citrate-derived catalysts. The Mg(Al)O periclase structure derived from
Mg-Al HT likely plays an important role in the regenerative activity of Pt- and Ru-Ni/Mg(Al)O catalysts.
Pt-doping was more effective than Ru for the catalyst sustainability in the oxidative reforming of C3H8.

Keywords: C3H8 reforming, H2 production, Pt or Ru-Ni/Mg(Al)O catalyst, Citrate, Hydrotalcite

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Informasi Detail

Judul Seri

Applied Catalysis A: General

No. Panggil

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Penerbit

London : Elsevier B.V.., 2009

Deskripsi Fisik

Applied Catalysis A: General 356 (2009) 231–242

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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