Promotion effect of Fe on the selectivity of Pd zeolite-X in methanol synthesis

B. M. Choudary, K. Lázár, I. Bogyay, L. Guczi

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Here evidence is provided for the promotion effect of iron on methanol formation on PdX zeolite catalysts. The high activity and selectivity for methanol formation are markedly superior to those observed either on non-promoted Pd or on Fe zeolite. The activation energy obtained for the optimum promoted zeolite catalyst is close to those observed on other oxide supports. It is suggested that the zeolite framework does not primarily influence the reaction path. The promotion effect is attributed to the presence of PdFe bimetallic particles located mainly inside the cages and their migration is hindered by Fe2+ ions. This is the first report on the formation of iron-containing bimetallic particles inside zeolite cages. The optimum atomic ratio for promotion is found at Fe: Pd = 0.07, and the catalyst with Fe: Pd = 0.2 still displays excellent catalytic performance. Above Fe: Pd = 0.3 formation of a separate α-iron phase is suggested, since the activity and selectivity for methanol drops and higher hydrocarbons are formed.

Original languageEnglish
Pages (from-to)419-424
Number of pages6
JournalJournal of the Chemical Society - Faraday Transactions
Volume86
Issue number2
DOIs
Publication statusPublished - 1990

Fingerprint

Zeolites
promotion
Methanol
methyl alcohol
selectivity
synthesis
iron
catalysts
Iron
Catalysts
Catalyst selectivity
Hydrocarbons
hydrocarbons
Oxides
activation energy
Catalyst activity
Activation energy
oxides
Ions
ions

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Promotion effect of Fe on the selectivity of Pd zeolite-X in methanol synthesis. / Choudary, B. M.; Lázár, K.; Bogyay, I.; Guczi, L.

In: Journal of the Chemical Society - Faraday Transactions, Vol. 86, No. 2, 1990, p. 419-424.

Research output: Contribution to journalArticle

@article{a189cf368edb4458b1813d2c9db78a33,
title = "Promotion effect of Fe on the selectivity of Pd zeolite-X in methanol synthesis",
abstract = "Here evidence is provided for the promotion effect of iron on methanol formation on PdX zeolite catalysts. The high activity and selectivity for methanol formation are markedly superior to those observed either on non-promoted Pd or on Fe zeolite. The activation energy obtained for the optimum promoted zeolite catalyst is close to those observed on other oxide supports. It is suggested that the zeolite framework does not primarily influence the reaction path. The promotion effect is attributed to the presence of PdFe bimetallic particles located mainly inside the cages and their migration is hindered by Fe2+ ions. This is the first report on the formation of iron-containing bimetallic particles inside zeolite cages. The optimum atomic ratio for promotion is found at Fe: Pd = 0.07, and the catalyst with Fe: Pd = 0.2 still displays excellent catalytic performance. Above Fe: Pd = 0.3 formation of a separate α-iron phase is suggested, since the activity and selectivity for methanol drops and higher hydrocarbons are formed.",
author = "Choudary, {B. M.} and K. L{\'a}z{\'a}r and I. Bogyay and L. Guczi",
year = "1990",
doi = "10.1039/FT9908600419",
language = "English",
volume = "86",
pages = "419--424",
journal = "Physical Chemistry Chemical Physics",
issn = "1463-9076",
publisher = "Royal Society of Chemistry",
number = "2",

}

TY - JOUR

T1 - Promotion effect of Fe on the selectivity of Pd zeolite-X in methanol synthesis

AU - Choudary, B. M.

AU - Lázár, K.

AU - Bogyay, I.

AU - Guczi, L.

PY - 1990

Y1 - 1990

N2 - Here evidence is provided for the promotion effect of iron on methanol formation on PdX zeolite catalysts. The high activity and selectivity for methanol formation are markedly superior to those observed either on non-promoted Pd or on Fe zeolite. The activation energy obtained for the optimum promoted zeolite catalyst is close to those observed on other oxide supports. It is suggested that the zeolite framework does not primarily influence the reaction path. The promotion effect is attributed to the presence of PdFe bimetallic particles located mainly inside the cages and their migration is hindered by Fe2+ ions. This is the first report on the formation of iron-containing bimetallic particles inside zeolite cages. The optimum atomic ratio for promotion is found at Fe: Pd = 0.07, and the catalyst with Fe: Pd = 0.2 still displays excellent catalytic performance. Above Fe: Pd = 0.3 formation of a separate α-iron phase is suggested, since the activity and selectivity for methanol drops and higher hydrocarbons are formed.

AB - Here evidence is provided for the promotion effect of iron on methanol formation on PdX zeolite catalysts. The high activity and selectivity for methanol formation are markedly superior to those observed either on non-promoted Pd or on Fe zeolite. The activation energy obtained for the optimum promoted zeolite catalyst is close to those observed on other oxide supports. It is suggested that the zeolite framework does not primarily influence the reaction path. The promotion effect is attributed to the presence of PdFe bimetallic particles located mainly inside the cages and their migration is hindered by Fe2+ ions. This is the first report on the formation of iron-containing bimetallic particles inside zeolite cages. The optimum atomic ratio for promotion is found at Fe: Pd = 0.07, and the catalyst with Fe: Pd = 0.2 still displays excellent catalytic performance. Above Fe: Pd = 0.3 formation of a separate α-iron phase is suggested, since the activity and selectivity for methanol drops and higher hydrocarbons are formed.

UR - http://www.scopus.com/inward/record.url?scp=0040856973&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0040856973&partnerID=8YFLogxK

U2 - 10.1039/FT9908600419

DO - 10.1039/FT9908600419

M3 - Article

VL - 86

SP - 419

EP - 424

JO - Physical Chemistry Chemical Physics

JF - Physical Chemistry Chemical Physics

SN - 1463-9076

IS - 2

ER -