Precious metal catalysts in the clean-up of biomass gasification gas: Part 2: Performance and sulfur tolerance of rhodium based catalysts

H. Rönkkönen (Corresponding Author), Pekka Simell, M. Niemelä, O. Krause

Research output: Contribution to journalArticleScientificpeer-review

14 Citations (Scopus)

Abstract

Rh, Pt, and Pt-Rh catalysts on modified commercial zirconia support (m-ZrO2) were screened for the clean-up of gasification gas from tar, methane, and ammonia both in the absence and presence of H2S while varying the Rh metal content from 0.5 to 5 w-%. Our goal was to optimize the composition of the Rh/m-ZrO2 catalyst in view of the production of ultra clean gas applicable for liquid biofuels synthesis. In the presence of 100 ppm sulfur, increasing Rh concentration from 0.5 to 5 w-% did not greatly improve the activity of the catalyst. The bimetallic Pt/Rh/m-ZrO2 catalyst was also less active than the 0.5 w-% Rh/m-ZrO2 catalyst. Furthermore, the Rh/m-ZrO2 catalyst regained its performance at the set point of 800 °C when the sulfur feed was turned off even after exposures to 500–1000 ppm sulfur. Our data allow us to suggest that in the presence of sulfur, the active sites responsible for the reforming reactions are poisoned, but less impact occurs on sites responsible for oxidation reactions. Furthermore, the screening experiments allow to suggest that the Rh/m-ZrO2 catalyst could be applicable to hot gas cleaning in the presence of sulfur (> 50 ppm) at above 800 °C using a moderate gas hourly space velocity of approximately 3400 1/h. Since biomass gasification gas generally contains sulfur, the 0.5 w-% Rh/m-ZrO2 catalyst could be a promising option for gasification gas clean-up applications at temperatures above 800 °C where it reduces tar to very low levels.
Original languageEnglish
Pages (from-to)1881-1889
Number of pages9
JournalFuel Processing Technology
Volume92
Issue number10
DOIs
Publication statusPublished - 2011
MoE publication typeA1 Journal article-refereed

Fingerprint

Rhodium
Precious metals
Gasification
Sulfur
Biomass
Gases
Catalysts
Tars
Tar
Biofuels
Methane
Reforming reactions
Ammonia
Catalyst supports
Zirconia
Cleaning
Screening
Metals
Oxidation
Liquids

Keywords

  • Aromatic hydrobarbon decomposition
  • gas clean-up
  • gasification
  • Rh catalyst

Cite this

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title = "Precious metal catalysts in the clean-up of biomass gasification gas: Part 2: Performance and sulfur tolerance of rhodium based catalysts",
abstract = "Rh, Pt, and Pt-Rh catalysts on modified commercial zirconia support (m-ZrO2) were screened for the clean-up of gasification gas from tar, methane, and ammonia both in the absence and presence of H2S while varying the Rh metal content from 0.5 to 5 w-{\%}. Our goal was to optimize the composition of the Rh/m-ZrO2 catalyst in view of the production of ultra clean gas applicable for liquid biofuels synthesis. In the presence of 100 ppm sulfur, increasing Rh concentration from 0.5 to 5 w-{\%} did not greatly improve the activity of the catalyst. The bimetallic Pt/Rh/m-ZrO2 catalyst was also less active than the 0.5 w-{\%} Rh/m-ZrO2 catalyst. Furthermore, the Rh/m-ZrO2 catalyst regained its performance at the set point of 800 °C when the sulfur feed was turned off even after exposures to 500–1000 ppm sulfur. Our data allow us to suggest that in the presence of sulfur, the active sites responsible for the reforming reactions are poisoned, but less impact occurs on sites responsible for oxidation reactions. Furthermore, the screening experiments allow to suggest that the Rh/m-ZrO2 catalyst could be applicable to hot gas cleaning in the presence of sulfur (> 50 ppm) at above 800 °C using a moderate gas hourly space velocity of approximately 3400 1/h. Since biomass gasification gas generally contains sulfur, the 0.5 w-{\%} Rh/m-ZrO2 catalyst could be a promising option for gasification gas clean-up applications at temperatures above 800 °C where it reduces tar to very low levels.",
keywords = "Aromatic hydrobarbon decomposition, gas clean-up, gasification, Rh catalyst",
author = "H. R{\"o}nkk{\"o}nen and Pekka Simell and M. Niemel{\"a} and O. Krause",
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language = "English",
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pages = "1881--1889",
journal = "Fuel Processing Technology",
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Precious metal catalysts in the clean-up of biomass gasification gas : Part 2: Performance and sulfur tolerance of rhodium based catalysts. / Rönkkönen, H. (Corresponding Author); Simell, Pekka; Niemelä, M.; Krause, O.

In: Fuel Processing Technology, Vol. 92, No. 10, 2011, p. 1881-1889.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Precious metal catalysts in the clean-up of biomass gasification gas

T2 - Part 2: Performance and sulfur tolerance of rhodium based catalysts

AU - Rönkkönen, H.

AU - Simell, Pekka

AU - Niemelä, M.

AU - Krause, O.

PY - 2011

Y1 - 2011

N2 - Rh, Pt, and Pt-Rh catalysts on modified commercial zirconia support (m-ZrO2) were screened for the clean-up of gasification gas from tar, methane, and ammonia both in the absence and presence of H2S while varying the Rh metal content from 0.5 to 5 w-%. Our goal was to optimize the composition of the Rh/m-ZrO2 catalyst in view of the production of ultra clean gas applicable for liquid biofuels synthesis. In the presence of 100 ppm sulfur, increasing Rh concentration from 0.5 to 5 w-% did not greatly improve the activity of the catalyst. The bimetallic Pt/Rh/m-ZrO2 catalyst was also less active than the 0.5 w-% Rh/m-ZrO2 catalyst. Furthermore, the Rh/m-ZrO2 catalyst regained its performance at the set point of 800 °C when the sulfur feed was turned off even after exposures to 500–1000 ppm sulfur. Our data allow us to suggest that in the presence of sulfur, the active sites responsible for the reforming reactions are poisoned, but less impact occurs on sites responsible for oxidation reactions. Furthermore, the screening experiments allow to suggest that the Rh/m-ZrO2 catalyst could be applicable to hot gas cleaning in the presence of sulfur (> 50 ppm) at above 800 °C using a moderate gas hourly space velocity of approximately 3400 1/h. Since biomass gasification gas generally contains sulfur, the 0.5 w-% Rh/m-ZrO2 catalyst could be a promising option for gasification gas clean-up applications at temperatures above 800 °C where it reduces tar to very low levels.

AB - Rh, Pt, and Pt-Rh catalysts on modified commercial zirconia support (m-ZrO2) were screened for the clean-up of gasification gas from tar, methane, and ammonia both in the absence and presence of H2S while varying the Rh metal content from 0.5 to 5 w-%. Our goal was to optimize the composition of the Rh/m-ZrO2 catalyst in view of the production of ultra clean gas applicable for liquid biofuels synthesis. In the presence of 100 ppm sulfur, increasing Rh concentration from 0.5 to 5 w-% did not greatly improve the activity of the catalyst. The bimetallic Pt/Rh/m-ZrO2 catalyst was also less active than the 0.5 w-% Rh/m-ZrO2 catalyst. Furthermore, the Rh/m-ZrO2 catalyst regained its performance at the set point of 800 °C when the sulfur feed was turned off even after exposures to 500–1000 ppm sulfur. Our data allow us to suggest that in the presence of sulfur, the active sites responsible for the reforming reactions are poisoned, but less impact occurs on sites responsible for oxidation reactions. Furthermore, the screening experiments allow to suggest that the Rh/m-ZrO2 catalyst could be applicable to hot gas cleaning in the presence of sulfur (> 50 ppm) at above 800 °C using a moderate gas hourly space velocity of approximately 3400 1/h. Since biomass gasification gas generally contains sulfur, the 0.5 w-% Rh/m-ZrO2 catalyst could be a promising option for gasification gas clean-up applications at temperatures above 800 °C where it reduces tar to very low levels.

KW - Aromatic hydrobarbon decomposition

KW - gas clean-up

KW - gasification

KW - Rh catalyst

U2 - 10.1016/j.fuproc.2011.05.004

DO - 10.1016/j.fuproc.2011.05.004

M3 - Article

VL - 92

SP - 1881

EP - 1889

JO - Fuel Processing Technology

JF - Fuel Processing Technology

SN - 0378-3820

IS - 10

ER -