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n-Butane dehydrogenation over Pt/Mg(In)(Al)O

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n-Butane dehydrogenation over Pt/Mg(In)(Al)O

Auteurs : RBID : Pascal:14-0047099

Descripteurs français

Pascal (Inist)
- Butane, Déshydrogénation, Catalyseur mixte, Coke, Catalyse hétérogène.
Wicri :
- concept : Butane, Coke.

English descriptors

KwdEn :
- Butane, Coke, Dehydrogenation, Heterogeneous catalysis, Mixed catalyst.

Abstract

The thermal dehydrogenation of butane to butene and hydrogen was investigated over Pt nanoparticles supported on calcined hydrotalcite containing indium, Mg(In)(Al)O. Prior work has shown that upon reduction in H₂ at temperatures above 673 K, bimetallic Pt-In particles of are formed, as evidenced by XANES and EXAFS. The performance of Pt/Mg(In)(Al)O for butane dehydrogenation was found to be highly dependent on the bulk In/Pt ratio. The optimal ratio was found to be between 0.33 and 0.88, yielding >95% selectivity to butenes. Hydrogen co-fed with butane was shown to suppress coke formation and catalyst deactivation, a ratio of H₂/C₄H₁₀ = 2.5 providing the best catalytic performance. Regeneration of catalysts after removal of accumulated carbon and reduction in H₂ restored the original catalyst activity and selectivity. Butane dehydrogenation above 803 K resulted in higher formation of butadiene, a known precursor to coke. No evidence for butane cracking was found to occur on Pt/Mg(In)(Al)O due to moderately basic nature of the support. The present study shows that Pt/Mg(In)(Al)O exhibits superior performance for butane dehydrogenation compared to supported Pt catalysts promoted with Sn, Ge, Pb, and In prepared by successive incipient wetness impregnation of the Pt and promoter precursors.

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Pascal:14-0047099

Le document en format XML

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<author><name sortKey="Wu, Jason" uniqKey="Wu J">Jason Wu</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Chemical and Biomolecular Engineering, University of California</s1>
<s2>Berkeley, CA 94720-1642</s2>
<s3>USA</s3>
<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
<sZ>3 aut.</sZ>
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<country>États-Unis</country>
<wicri:noRegion>Berkeley, CA 94720-1642</wicri:noRegion>
</affiliation>
</author>
<author><name>ZHENMENG PENG</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Chemical and Biomolecular Engineering, University of California</s1>
<s2>Berkeley, CA 94720-1642</s2>
<s3>USA</s3>
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<country>États-Unis</country>
<wicri:noRegion>Berkeley, CA 94720-1642</wicri:noRegion>
</affiliation>
</author>
<author><name>PINGPING SUN</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Chemical and Biomolecular Engineering, University of California</s1>
<s2>Berkeley, CA 94720-1642</s2>
<s3>USA</s3>
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<wicri:noRegion>Berkeley, CA 94720-1642</wicri:noRegion>
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</author>
<author><name sortKey="Bell, Alexis T" uniqKey="Bell A">Alexis T. Bell</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Chemical and Biomolecular Engineering, University of California</s1>
<s2>Berkeley, CA 94720-1642</s2>
<s3>USA</s3>
<sZ>1 aut.</sZ>
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<title level="j" type="abbreviated">Appl. catal., A Gen. : (Print)</title>
<title level="j" type="main">Applied catalysis. A, General : (Print)</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Butane</term>
<term>Coke</term>
<term>Dehydrogenation</term>
<term>Heterogeneous catalysis</term>
<term>Mixed catalyst</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Butane</term>
<term>Déshydrogénation</term>
<term>Catalyseur mixte</term>
<term>Coke</term>
<term>Catalyse hétérogène</term>
</keywords>
<keywords scheme="Wicri" type="concept" xml:lang="fr"><term>Butane</term>
<term>Coke</term>
</keywords>
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<front><div type="abstract" xml:lang="en">The thermal dehydrogenation of butane to butene and hydrogen was investigated over Pt nanoparticles supported on calcined hydrotalcite containing indium, Mg(In)(Al)O. Prior work has shown that upon reduction in H<sub>2</sub>
 at temperatures above 673 K, bimetallic Pt-In particles of are formed, as evidenced by XANES and EXAFS. The performance of Pt/Mg(In)(Al)O for butane dehydrogenation was found to be highly dependent on the bulk In/Pt ratio. The optimal ratio was found to be between 0.33 and 0.88, yielding >95% selectivity to butenes. Hydrogen co-fed with butane was shown to suppress coke formation and catalyst deactivation, a ratio of H<sub>2</sub>
/C<sub>4</sub>
H<sub>10</sub>
 = 2.5 providing the best catalytic performance. Regeneration of catalysts after removal of accumulated carbon and reduction in H<sub>2</sub>
 restored the original catalyst activity and selectivity. Butane dehydrogenation above 803 K resulted in higher formation of butadiene, a known precursor to coke. No evidence for butane cracking was found to occur on Pt/Mg(In)(Al)O due to moderately basic nature of the support. The present study shows that Pt/Mg(In)(Al)O exhibits superior performance for butane dehydrogenation compared to supported Pt catalysts promoted with Sn, Ge, Pb, and In prepared by successive incipient wetness impregnation of the Pt and promoter precursors.</div>
</front>
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<fA11 i1="02" i2="1"><s1>ZHENMENG PENG</s1>
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</fA11>
<fA11 i1="04" i2="1"><s1>BELL (Alexis T.)</s1>
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<fA14 i1="01"><s1>Department of Chemical and Biomolecular Engineering, University of California</s1>
<s2>Berkeley, CA 94720-1642</s2>
<s3>USA</s3>
<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
<sZ>3 aut.</sZ>
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<fA66 i1="01"><s0>GBR</s0>
</fA66>
<fC01 i1="01" l="ENG"><s0>The thermal dehydrogenation of butane to butene and hydrogen was investigated over Pt nanoparticles supported on calcined hydrotalcite containing indium, Mg(In)(Al)O. Prior work has shown that upon reduction in H<sub>2</sub>
 at temperatures above 673 K, bimetallic Pt-In particles of are formed, as evidenced by XANES and EXAFS. The performance of Pt/Mg(In)(Al)O for butane dehydrogenation was found to be highly dependent on the bulk In/Pt ratio. The optimal ratio was found to be between 0.33 and 0.88, yielding >95% selectivity to butenes. Hydrogen co-fed with butane was shown to suppress coke formation and catalyst deactivation, a ratio of H<sub>2</sub>
/C<sub>4</sub>
H<sub>10</sub>
 = 2.5 providing the best catalytic performance. Regeneration of catalysts after removal of accumulated carbon and reduction in H<sub>2</sub>
 restored the original catalyst activity and selectivity. Butane dehydrogenation above 803 K resulted in higher formation of butadiene, a known precursor to coke. No evidence for butane cracking was found to occur on Pt/Mg(In)(Al)O due to moderately basic nature of the support. The present study shows that Pt/Mg(In)(Al)O exhibits superior performance for butane dehydrogenation compared to supported Pt catalysts promoted with Sn, Ge, Pb, and In prepared by successive incipient wetness impregnation of the Pt and promoter precursors.</s0>
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<s2>NK</s2>
<s5>01</s5>
</fC03>
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<s5>01</s5>
</fC03>
<fC03 i1="01" i2="X" l="SPA"><s0>Butano</s0>
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<s5>02</s5>
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<fC03 i1="03" i2="X" l="FRE"><s0>Catalyseur mixte</s0>
<s5>03</s5>
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<s5>03</s5>
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<fC03 i1="03" i2="X" l="SPA"><s0>Catalizador mixto</s0>
<s5>03</s5>
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<fC03 i1="04" i2="X" l="FRE"><s0>Coke</s0>
<s5>04</s5>
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<fC03 i1="04" i2="X" l="ENG"><s0>Coke</s0>
<s5>04</s5>
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<fC03 i1="04" i2="X" l="SPA"><s0>Coque</s0>
<s5>04</s5>
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<s5>05</s5>
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<fN44 i1="01"><s1>OTO</s1>
</fN44>
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n-Butane dehydrogenation over Pt/Mg(In)(Al)O

n-Butane dehydrogenation over Pt/Mg(In)(Al)O

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri