What question did this study set out to answer?

This research aims to investigate the deactivation of Ni catalysts in CO2 methanation processes.

March 14, 20260 citationsOpen Access

Deactivation of Ni catalyst in three-phase CO 2 methanation

MHMathias HeldDVGW-Forschungsstelle am Engler-Bunte-Institut des Karlsruher Instituts für Technologie AHAnna HolfelderFraunhofer Institute for Solar Energy Systems SBSiegfried BajohrKarlsruhe Institute of Technology

Key Points

This research aims to investigate the deactivation of Ni catalysts in CO2 methanation processes.
Utilized a slurry bubble column reactor for three-phase CO2 methanation.
Examined the effects of reactor temperatures over 260 °C on Ni/SiO2 catalyst performance.
Measured catalytic activity loss after prolonged operation at high temperatures.
Observed 50% loss of catalytic activity after 120 hours of operation at 320 °C.
Identified dibenzyl toluene decomposition as a cause for catalyst deactivation.
Confirmed carbon deposition on the catalyst surface due to high reactor temperature.

Abstract

In three-phase CO2 methanation dibenzyl toluene is used as the liquid phase in a slurry bubble column reactor. At reactor temperatures (TR) higher than 260 °C deactivation of the Ni/SiO2 catalyst was observed. After deactivation for 120 h at TR = 320 °C, stationary operation is possible with a loss of catalytic activity of ≈50%. Based on experimental results, it can be stated that deactivation is caused by decomposition of dibenzyl toluene at high reactor temperature, resulting in carbon deposition on the catalyst surface.

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