Effects of Zn and Mn Promotion in Fe-Based Catalysts Used for COx Hydrogenation to Long-Chain Hydrocarbons

Leonardo Falbo; Michela Martinelli; Carlo Giorgio Visconti; Luca Lietti; Pio Forzatti; Claudia Bassano; Paolo Deiana

doi:10.1021/acs.iecr.7b01494

Effects of Zn and Mn Promotion in Fe-Based Catalysts Used for CO_x Hydrogenation to Long-Chain Hydrocarbons

Leonardo Falbo, Michela Martinelli, Carlo Giorgio Visconti, Luca Lietti, Pio Forzatti, Claudia Bassano, Paolo Deiana

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

27 Scopus citations

Abstract

The promoting effect of Mn and Zn on the performance of Fe-based catalysts has been comparatively investigated in the CO_x hydrogenation to heavy hydrocarbons in the presence of H₂-deficient streams. To this scope, two catalysts have been prepared by coprecipitation, followed by impregnation with Cu and K, and tested at 220 °C and 30 bar_g after an activation treatment with syngas. Both catalysts have been found to be active and selective to long-chain hydrocarbons in the presence of either H₂/CO or H₂/CO₂ mixtures. Despite lower catalyst reducibility, the presence of Zn has resulted in higher CO_x conversion rates. Furthermore, the Zn-promoted catalyst converted CO_x into heavier and less-saturated hydrocarbons. These results are consistent with a role of Zn in promoting the catalyst basicity, which is a key property to keep low the superficial H/C ratio and to slow chain termination reactions as well as secondary olefin hydrogenations.

Original language	English
Pages (from-to)	13146-13156
Number of pages	11
Journal	Industrial and Engineering Chemistry Research
Volume	56
Issue number	45
DOIs	https://doi.org/10.1021/acs.iecr.7b01494
State	Published - Nov 15 2017

Bibliographical note

Publisher Copyright:
© 2017 American Chemical Society.

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering
Industrial and Manufacturing Engineering

Access to Document

10.1021/acs.iecr.7b01494

Cite this

@article{7b68cb5816d949aebb73f78d7f1da023,

title = "Effects of Zn and Mn Promotion in Fe-Based Catalysts Used for COx Hydrogenation to Long-Chain Hydrocarbons",

abstract = "The promoting effect of Mn and Zn on the performance of Fe-based catalysts has been comparatively investigated in the COx hydrogenation to heavy hydrocarbons in the presence of H2-deficient streams. To this scope, two catalysts have been prepared by coprecipitation, followed by impregnation with Cu and K, and tested at 220 °C and 30 barg after an activation treatment with syngas. Both catalysts have been found to be active and selective to long-chain hydrocarbons in the presence of either H2/CO or H2/CO2 mixtures. Despite lower catalyst reducibility, the presence of Zn has resulted in higher COx conversion rates. Furthermore, the Zn-promoted catalyst converted COx into heavier and less-saturated hydrocarbons. These results are consistent with a role of Zn in promoting the catalyst basicity, which is a key property to keep low the superficial H/C ratio and to slow chain termination reactions as well as secondary olefin hydrogenations.",

author = "Leonardo Falbo and Michela Martinelli and Visconti, {Carlo Giorgio} and Luca Lietti and Pio Forzatti and Claudia Bassano and Paolo Deiana",

note = "Publisher Copyright: {\textcopyright} 2017 American Chemical Society.",

year = "2017",

month = nov,

day = "15",

doi = "10.1021/acs.iecr.7b01494",

language = "English",

volume = "56",

pages = "13146--13156",

number = "45",

}

TY - JOUR

T1 - Effects of Zn and Mn Promotion in Fe-Based Catalysts Used for COx Hydrogenation to Long-Chain Hydrocarbons

AU - Falbo, Leonardo

AU - Martinelli, Michela

AU - Visconti, Carlo Giorgio

AU - Lietti, Luca

AU - Forzatti, Pio

AU - Bassano, Claudia

AU - Deiana, Paolo

PY - 2017/11/15

Y1 - 2017/11/15

N2 - The promoting effect of Mn and Zn on the performance of Fe-based catalysts has been comparatively investigated in the COx hydrogenation to heavy hydrocarbons in the presence of H2-deficient streams. To this scope, two catalysts have been prepared by coprecipitation, followed by impregnation with Cu and K, and tested at 220 °C and 30 barg after an activation treatment with syngas. Both catalysts have been found to be active and selective to long-chain hydrocarbons in the presence of either H2/CO or H2/CO2 mixtures. Despite lower catalyst reducibility, the presence of Zn has resulted in higher COx conversion rates. Furthermore, the Zn-promoted catalyst converted COx into heavier and less-saturated hydrocarbons. These results are consistent with a role of Zn in promoting the catalyst basicity, which is a key property to keep low the superficial H/C ratio and to slow chain termination reactions as well as secondary olefin hydrogenations.

AB - The promoting effect of Mn and Zn on the performance of Fe-based catalysts has been comparatively investigated in the COx hydrogenation to heavy hydrocarbons in the presence of H2-deficient streams. To this scope, two catalysts have been prepared by coprecipitation, followed by impregnation with Cu and K, and tested at 220 °C and 30 barg after an activation treatment with syngas. Both catalysts have been found to be active and selective to long-chain hydrocarbons in the presence of either H2/CO or H2/CO2 mixtures. Despite lower catalyst reducibility, the presence of Zn has resulted in higher COx conversion rates. Furthermore, the Zn-promoted catalyst converted COx into heavier and less-saturated hydrocarbons. These results are consistent with a role of Zn in promoting the catalyst basicity, which is a key property to keep low the superficial H/C ratio and to slow chain termination reactions as well as secondary olefin hydrogenations.

UR - http://www.scopus.com/inward/record.url?scp=85034070362&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85034070362&partnerID=8YFLogxK

U2 - 10.1021/acs.iecr.7b01494

DO - 10.1021/acs.iecr.7b01494

M3 - Article

AN - SCOPUS:85034070362

SN - 0888-5885

VL - 56

SP - 13146

EP - 13156

JO - Industrial and Engineering Chemistry Research

JF - Industrial and Engineering Chemistry Research

IS - 45

ER -