Effect of fly ash and H2S on a Ni-based catalyst for the upgrading of a biomass-generated gas

Albertazzi, Simone; Basile, F. C.; Brandin, Jan; Einvall, Jessica; Fornasari, Giuseppe; Hulteberg, Christian; Sanati, Mehri; Trifirò, F.; Vaccari, Angelo

doi:10.1016/j.biombioe.2007.10.002

Cited by 44 publications

(36 citation statements)

References 15 publications

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“…One approach that is being explored is the use of sulfur sorbents for in-line use to reduce the concentration of sulfur that the catalyst sees (Torres et al 2007). Another synergistic approach that is being investigated (Albertazzi et al 2007) is to determine the exact mechanism of deactivation and given this information make the determination if it is reversible or irreversible deactivation. In other words, researchers are determining the regeneration capacity of these catalysts in the presence of sulfur and other inhibitors.…”

Section: Catalyst Inhibitors and Poisonsmentioning

confidence: 99%

An economic and environmental comparison of a biochemical and a thermochemical lignocellulosic ethanol conversion processes

et al. 2009

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With the world's focus on rapidly deploying second generation biofuels technologies, there exists today a good deal of interest in how yields, economics, and environmental impacts of the various conversion processes of lignocellulosic biomass to transportation fuels compare. Although there is a good deal of information regarding these conversion processes, this information is typically very difficult to use on a comparison basis because different underlying assumptions, such as feedstock costs, plant size, co-product credits or assumed state of technology, have been utilized. In this study, a rigorous comparison of different biomass to transportation fuels conversion processes was performed with standard underlying economic and environmental assumptions so that exact comparisons can be made. This study looked at promising second-generation conversion processes utilizing biochemical and thermochemical gasification technologies on both a current and an achievable state of technology in 2012. The fundamental finding of this study is that although the biochemical and thermochemical processes to ethanol analyzed have their individual strengths and weaknesses, the two processes have very comparable yields, economics, and environmental impacts. Hence, this study concludes that based on this analysis there is not a distinct economic or environmental impact difference between biochemical and thermochemical gasification processes for second generation ethanol production.

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Section: Catalyst Inhibitors and Poisonsmentioning

confidence: 99%

An economic and environmental comparison of a biochemical and a thermochemical lignocellulosic ethanol conversion processes

et al. 2009

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“…In this work, special emphasis was dedicated to study the influence of hydrogen sulfide on catalyst activity and to a posterior catalyst regeneration through several processes [20,21]: the self-regeneration process and the regeneration by low temperature oxidation processes. For this reason, Ni was selected, and the γ-Al 2 O 3 support was modified with ceria and zirconia and a noble metal, Rh, to improve catalyst stability.…”

Section: Introductionmentioning

confidence: 99%

Catalyst Deactivation and Regeneration Processes in Biogas Tri-Reforming Process. The Effect of Hydrogen Sulfide Addition

et al. 2018

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Abstract:This work studies Ni-based catalyst deactivation and regeneration processes in the presence of H 2 S under a biogas tri-reforming process for hydrogen production, which is an energy vector of great interest. 25 ppm of hydrogen sulfide were continuously added to the system in order to provoke an observable catalyst deactivation, and once fully deactivated two different regeneration processes were studied: a self-regeneration and a regeneration by low temperature oxidation. For that purpose, several Ni-based catalysts and a bimetallic Rh-Ni catalyst supported on alumina modified with CeO 2 and ZrO 2 were used as well as a commercial Katalco 57-5 for comparison purposes. Ni/Ce-Al 2 O 3 and Ni/Ce-Zr-Al 2 O 3 catalysts almost recovered their initial activity. For these catalysts, after the regeneration under oxidative conditions at low temperature, the CO 2 conversions achieved-79.5% and 86.9%, respectively-were significantly higher than the ones obtained before sulfur poisoning-66.7% and 45.2%, respectively. This effect could be attributed to the support modification with CeO 2 and the higher selectivity achieved for the Reverse Water-Gas-Shift (rWGS) reaction after catalysts deactivation. As expected, the bimetallic Rh-Ni/Ce-Al 2 O 3 catalyst showed higher resistance to deactivation and its sulfur poisoning seems to be reversible. In the case of the commercial and Ni/Zr-Al 2 O 3 catalysts, they did not recover their activity.

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“…This has also been demonstrated in laboratory tests during the CHRISGAS project [7,8]. However, operating at higher temperatures than conventional will increase the rate of sintering of the catalysts; at least if the catalysts have high loading of nickel.…”

Section: The Reformer Unitmentioning

confidence: 86%

Unit operations for production of clean hydrogen-rich synthesis gas from gasified biomass

Brandin

Liliedahl

2011

Biomass and Bioenergy

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The rebuild of the Växjö Värnamo Biomass Gasification Center (VVBGC) integrated gasification combined cycle (IGCC) plant into a plant for production of a clean hydrogen rich synthesis gas requires an extensive adaptation of conventional techniques to the special chemical and physical needs found in a gasified biomass environment. The CHRISGAS project has, in a multitude of areas, been responsible for the research and development activities associated with the rebuild. In this paper the present status and some of the issues concerning the upgrading of the product gas from gasified biomass into synthesis gas are addressed. The purpose is to serve as an introduction to the scientific papers written by the partners in the consortium concerning the unit operations of the process.

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Effect of fly ash and H2S on a Ni-based catalyst for the upgrading of a biomass-generated gas

Cited by 44 publications

References 15 publications

An economic and environmental comparison of a biochemical and a thermochemical lignocellulosic ethanol conversion processes

An economic and environmental comparison of a biochemical and a thermochemical lignocellulosic ethanol conversion processes

Catalyst Deactivation and Regeneration Processes in Biogas Tri-Reforming Process. The Effect of Hydrogen Sulfide Addition

Unit operations for production of clean hydrogen-rich synthesis gas from gasified biomass

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