Effect of potassium addition on bimetallic PtSn supported θ-Al 2O3 catalyst for n-butane dehydrogenation to olefins

Bhari Mallanna Nagaraja, Heon Jung, Dae Ryook Yang, Kwang Deog Jung

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Abstract

PtSn/θ-Al2O3 catalysts with different amount of potassium (0.4, 0.7, 0.95, 1.2 and 1.45 wt.%) were prepared by an impregnation method, and their catalytic activity in n-butane dehydrogenation was investigated at 823 K, an atmospheric pressure and a GHSV of 18,000 mL(g cat h)-1. The compositions listed in order of n-C 4 = yields at 823 K were as follows: K0.95(PtSn) 1.5 > (PtSn)1.5 > K0.4(PtSn) 1.5 > K0.7(PtSn)1.5 > K 1.2(PtSn)1.5 > K1.45(PtSn)1.5 > K0.9(Pt)1.5. The K0.9(Pt)1.5 and K0.95(Sn)1.5 catalyst severely deactivated in n-butane dehydrogenation. The (PtSn)1.5 (without K) catalyst showed the highest n-butane conversion, while K0.95(PtSn)1.5 did the highest n-C4 = yield. The small amount of potassium on bimetallic PtSn/θ-Al2O3 catalyst improved n-C 4 = selectivity, but slightly decreased n-butane conversion, resulting in the increase of n-C4 = yield. The effect of potassium was caused by blocking the acid sites of Pt catalyst. The TPR and HAADF STEM-EDS study suggested the reduction procedure of the Pt, Sn and K species. However, the higher loaded potassium (1.2 and 1.45 wt.%) doped (PtSn)1.5 catalysts were rather highly deactivated because the sizes of Pt particles were increased by weakening the interaction between Pt and Sn. The n-C4 = selectivity of the (PtSn)1.5 catalyst increased with respect to the reaction, while that of the potassium doped catalysts maintained the high n-C4 = selectivity from the beginning of the reaction. Also, different alkali metals (Ca, Na and Li) were tested for the comparison with K. The potassium doped catalyst showed the highest n-C4 = yield among the other alkali metals for n-butane dehydrogenation.

Original languageEnglish
Pages (from-to)40-52
Number of pages13
JournalCatalysis Today
Volume232
DOIs
Publication statusPublished - 2014 Sep 1

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Butane
Alkenes
Dehydrogenation
Olefins
Potassium
Catalysts
Catalyst selectivity
Alkali Metals
Alkali metals
butane
Impregnation
Atmospheric pressure
Energy dispersive spectroscopy
Catalyst activity
Acids
Chemical analysis

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

Cite this

Effect of potassium addition on bimetallic PtSn supported θ-Al 2O3 catalyst for n-butane dehydrogenation to olefins. / Nagaraja, Bhari Mallanna; Jung, Heon; Yang, Dae Ryook; Jung, Kwang Deog.

In: Catalysis Today, Vol. 232, 01.09.2014, p. 40-52.

Research output: Contribution to journalArticle

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title = "Effect of potassium addition on bimetallic PtSn supported θ-Al 2O3 catalyst for n-butane dehydrogenation to olefins",
abstract = "PtSn/θ-Al2O3 catalysts with different amount of potassium (0.4, 0.7, 0.95, 1.2 and 1.45 wt.{\%}) were prepared by an impregnation method, and their catalytic activity in n-butane dehydrogenation was investigated at 823 K, an atmospheric pressure and a GHSV of 18,000 mL(g cat h)-1. The compositions listed in order of n-C 4 = yields at 823 K were as follows: K0.95(PtSn) 1.5 > (PtSn)1.5 > K0.4(PtSn) 1.5 > K0.7(PtSn)1.5 > K 1.2(PtSn)1.5 > K1.45(PtSn)1.5 > K0.9(Pt)1.5. The K0.9(Pt)1.5 and K0.95(Sn)1.5 catalyst severely deactivated in n-butane dehydrogenation. The (PtSn)1.5 (without K) catalyst showed the highest n-butane conversion, while K0.95(PtSn)1.5 did the highest n-C4 = yield. The small amount of potassium on bimetallic PtSn/θ-Al2O3 catalyst improved n-C 4 = selectivity, but slightly decreased n-butane conversion, resulting in the increase of n-C4 = yield. The effect of potassium was caused by blocking the acid sites of Pt catalyst. The TPR and HAADF STEM-EDS study suggested the reduction procedure of the Pt, Sn and K species. However, the higher loaded potassium (1.2 and 1.45 wt.{\%}) doped (PtSn)1.5 catalysts were rather highly deactivated because the sizes of Pt particles were increased by weakening the interaction between Pt and Sn. The n-C4 = selectivity of the (PtSn)1.5 catalyst increased with respect to the reaction, while that of the potassium doped catalysts maintained the high n-C4 = selectivity from the beginning of the reaction. Also, different alkali metals (Ca, Na and Li) were tested for the comparison with K. The potassium doped catalyst showed the highest n-C4 = yield among the other alkali metals for n-butane dehydrogenation.",
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T1 - Effect of potassium addition on bimetallic PtSn supported θ-Al 2O3 catalyst for n-butane dehydrogenation to olefins

AU - Nagaraja, Bhari Mallanna

AU - Jung, Heon

AU - Yang, Dae Ryook

AU - Jung, Kwang Deog

PY - 2014/9/1

Y1 - 2014/9/1

N2 - PtSn/θ-Al2O3 catalysts with different amount of potassium (0.4, 0.7, 0.95, 1.2 and 1.45 wt.%) were prepared by an impregnation method, and their catalytic activity in n-butane dehydrogenation was investigated at 823 K, an atmospheric pressure and a GHSV of 18,000 mL(g cat h)-1. The compositions listed in order of n-C 4 = yields at 823 K were as follows: K0.95(PtSn) 1.5 > (PtSn)1.5 > K0.4(PtSn) 1.5 > K0.7(PtSn)1.5 > K 1.2(PtSn)1.5 > K1.45(PtSn)1.5 > K0.9(Pt)1.5. The K0.9(Pt)1.5 and K0.95(Sn)1.5 catalyst severely deactivated in n-butane dehydrogenation. The (PtSn)1.5 (without K) catalyst showed the highest n-butane conversion, while K0.95(PtSn)1.5 did the highest n-C4 = yield. The small amount of potassium on bimetallic PtSn/θ-Al2O3 catalyst improved n-C 4 = selectivity, but slightly decreased n-butane conversion, resulting in the increase of n-C4 = yield. The effect of potassium was caused by blocking the acid sites of Pt catalyst. The TPR and HAADF STEM-EDS study suggested the reduction procedure of the Pt, Sn and K species. However, the higher loaded potassium (1.2 and 1.45 wt.%) doped (PtSn)1.5 catalysts were rather highly deactivated because the sizes of Pt particles were increased by weakening the interaction between Pt and Sn. The n-C4 = selectivity of the (PtSn)1.5 catalyst increased with respect to the reaction, while that of the potassium doped catalysts maintained the high n-C4 = selectivity from the beginning of the reaction. Also, different alkali metals (Ca, Na and Li) were tested for the comparison with K. The potassium doped catalyst showed the highest n-C4 = yield among the other alkali metals for n-butane dehydrogenation.

AB - PtSn/θ-Al2O3 catalysts with different amount of potassium (0.4, 0.7, 0.95, 1.2 and 1.45 wt.%) were prepared by an impregnation method, and their catalytic activity in n-butane dehydrogenation was investigated at 823 K, an atmospheric pressure and a GHSV of 18,000 mL(g cat h)-1. The compositions listed in order of n-C 4 = yields at 823 K were as follows: K0.95(PtSn) 1.5 > (PtSn)1.5 > K0.4(PtSn) 1.5 > K0.7(PtSn)1.5 > K 1.2(PtSn)1.5 > K1.45(PtSn)1.5 > K0.9(Pt)1.5. The K0.9(Pt)1.5 and K0.95(Sn)1.5 catalyst severely deactivated in n-butane dehydrogenation. The (PtSn)1.5 (without K) catalyst showed the highest n-butane conversion, while K0.95(PtSn)1.5 did the highest n-C4 = yield. The small amount of potassium on bimetallic PtSn/θ-Al2O3 catalyst improved n-C 4 = selectivity, but slightly decreased n-butane conversion, resulting in the increase of n-C4 = yield. The effect of potassium was caused by blocking the acid sites of Pt catalyst. The TPR and HAADF STEM-EDS study suggested the reduction procedure of the Pt, Sn and K species. However, the higher loaded potassium (1.2 and 1.45 wt.%) doped (PtSn)1.5 catalysts were rather highly deactivated because the sizes of Pt particles were increased by weakening the interaction between Pt and Sn. The n-C4 = selectivity of the (PtSn)1.5 catalyst increased with respect to the reaction, while that of the potassium doped catalysts maintained the high n-C4 = selectivity from the beginning of the reaction. Also, different alkali metals (Ca, Na and Li) were tested for the comparison with K. The potassium doped catalyst showed the highest n-C4 = yield among the other alkali metals for n-butane dehydrogenation.

KW - Effect of alkali metal

KW - n-Butane dehydrogenation

KW - n-Butenes

KW - PtSn alloy formation

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