A highly stable and selective Pt-modified mordenite catalyst for the skeletal isomerization of n-butane

José Ignacio Villegas; Narendra Kumar; Teemu Heikkilä; Agáta Smiešková; Pavol Hudec; Tapio Salmi; Dmitry Yu Murzin

doi:10.1016/j.apcata.2005.01.038

A highly stable and selective Pt-modified mordenite catalyst for the skeletal isomerization of n-butane

José Ignacio Villegas, Narendra Kumar, Teemu Heikkilä, Agáta Smiešková, Pavol Hudec, Tapio Salmi, Dmitry Yu Murzin^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › Scientific › peer-review

14 Citations (Scopus)

Abstract

The aim of this work is to investigate the skeletal isomerization of n-butane to isobutane over Pt-modified mordenite zeolite catalysts and proton form mordenite with different SiO₂/Al₂ O₃ ratios. The 2-wt% Pt-H-MOR-20 and 2-wt% Pt-H-MOR-12.8 catalysts were synthesized by impregnation method, while H-MOR-12.8 and H-MOR-20 were obtained by calcinations of their ammonium-form counterparts. The influence of reaction temperature, carrier gas and dilution of the feed stream on the conversion of n-butane and yield of isobutane during time-on-stream has been studied. The Pt-modified mordenite catalysts have been characterized using XRD, scanning electron microscopy (SEM), nitrogen adsorption, CO chemisorption and FTIR of adsorbed pyridine. Pt-H-MOR-12.8 exhibited the highest yield and selectivity to isobutane and it was the most stable towards catalyst deactivation. Typically, an excess of propane with respect to pentanes was formed and the selectivity to pentanes remained constant for the different Pt-H-MOR and conditions tested. Selectivity to propane was inversely dependent on the H₂ concentration in the feed and the SiO₂ Al₂O₃ ratio.

Original language	English
Pages (from-to)	223-230
Number of pages	8
Journal	Applied Catalysis A: General
Volume	284
Issue number	1-2
DOIs	https://doi.org/10.1016/j.apcata.2005.01.038
Publication status	Published - 28 Apr 2005
MoE publication type	A1 Journal article-refereed

Keywords

Acidity
Isobutane
Mordenite
n-Butane
Platinum
Skeletal isomerization
Stability

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10.1016/j.apcata.2005.01.038

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title = "A highly stable and selective Pt-modified mordenite catalyst for the skeletal isomerization of n-butane",

abstract = "The aim of this work is to investigate the skeletal isomerization of n-butane to isobutane over Pt-modified mordenite zeolite catalysts and proton form mordenite with different SiO2/Al2 O3 ratios. The 2-wt% Pt-H-MOR-20 and 2-wt% Pt-H-MOR-12.8 catalysts were synthesized by impregnation method, while H-MOR-12.8 and H-MOR-20 were obtained by calcinations of their ammonium-form counterparts. The influence of reaction temperature, carrier gas and dilution of the feed stream on the conversion of n-butane and yield of isobutane during time-on-stream has been studied. The Pt-modified mordenite catalysts have been characterized using XRD, scanning electron microscopy (SEM), nitrogen adsorption, CO chemisorption and FTIR of adsorbed pyridine. Pt-H-MOR-12.8 exhibited the highest yield and selectivity to isobutane and it was the most stable towards catalyst deactivation. Typically, an excess of propane with respect to pentanes was formed and the selectivity to pentanes remained constant for the different Pt-H-MOR and conditions tested. Selectivity to propane was inversely dependent on the H2 concentration in the feed and the SiO2 Al2O3 ratio.",

keywords = "Acidity, Isobutane, Mordenite, n-Butane, Platinum, Skeletal isomerization, Stability",

author = "Villegas, {Jos{\'e} Ignacio} and Narendra Kumar and Teemu Heikkil{\"a} and Ag{\'a}ta Smie{\v s}kov{\'a} and Pavol Hudec and Tapio Salmi and Murzin, {Dmitry Yu}",

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T1 - A highly stable and selective Pt-modified mordenite catalyst for the skeletal isomerization of n-butane

AU - Villegas, José Ignacio

AU - Kumar, Narendra

AU - Heikkilä, Teemu

AU - Smiešková, Agáta

AU - Hudec, Pavol

AU - Salmi, Tapio

AU - Murzin, Dmitry Yu

PY - 2005/4/28

Y1 - 2005/4/28

N2 - The aim of this work is to investigate the skeletal isomerization of n-butane to isobutane over Pt-modified mordenite zeolite catalysts and proton form mordenite with different SiO2/Al2 O3 ratios. The 2-wt% Pt-H-MOR-20 and 2-wt% Pt-H-MOR-12.8 catalysts were synthesized by impregnation method, while H-MOR-12.8 and H-MOR-20 were obtained by calcinations of their ammonium-form counterparts. The influence of reaction temperature, carrier gas and dilution of the feed stream on the conversion of n-butane and yield of isobutane during time-on-stream has been studied. The Pt-modified mordenite catalysts have been characterized using XRD, scanning electron microscopy (SEM), nitrogen adsorption, CO chemisorption and FTIR of adsorbed pyridine. Pt-H-MOR-12.8 exhibited the highest yield and selectivity to isobutane and it was the most stable towards catalyst deactivation. Typically, an excess of propane with respect to pentanes was formed and the selectivity to pentanes remained constant for the different Pt-H-MOR and conditions tested. Selectivity to propane was inversely dependent on the H2 concentration in the feed and the SiO2 Al2O3 ratio.

AB - The aim of this work is to investigate the skeletal isomerization of n-butane to isobutane over Pt-modified mordenite zeolite catalysts and proton form mordenite with different SiO2/Al2 O3 ratios. The 2-wt% Pt-H-MOR-20 and 2-wt% Pt-H-MOR-12.8 catalysts were synthesized by impregnation method, while H-MOR-12.8 and H-MOR-20 were obtained by calcinations of their ammonium-form counterparts. The influence of reaction temperature, carrier gas and dilution of the feed stream on the conversion of n-butane and yield of isobutane during time-on-stream has been studied. The Pt-modified mordenite catalysts have been characterized using XRD, scanning electron microscopy (SEM), nitrogen adsorption, CO chemisorption and FTIR of adsorbed pyridine. Pt-H-MOR-12.8 exhibited the highest yield and selectivity to isobutane and it was the most stable towards catalyst deactivation. Typically, an excess of propane with respect to pentanes was formed and the selectivity to pentanes remained constant for the different Pt-H-MOR and conditions tested. Selectivity to propane was inversely dependent on the H2 concentration in the feed and the SiO2 Al2O3 ratio.

KW - Acidity

KW - Isobutane

KW - Mordenite

KW - n-Butane

KW - Platinum

KW - Skeletal isomerization

KW - Stability

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JO - Applied Catalysis A: General

JF - Applied Catalysis A: General

IS - 1-2

ER -

A highly stable and selective Pt-modified mordenite catalyst for the skeletal isomerization of n-butane

Abstract

Keywords

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