Exploiting In-Situ Characterization for a Sabatier Reaction to Reveal Catalytic Details

Abstract

In situ characterization of catalysts provides important information on the catalyst and the understanding of its activity and selectivity for a specific reaction. TPX techniques for catalyst characterization reveal the role of the support on the stabilization and dispersion of the active sites. However, these can be altered at high temperature since sintering of active species can occur as well as possible carbon deposition through the Bosch reaction, which hinders the active species and deactivates the catalyst. In situ characterization of the spent catalyst, however, may expose the causes for catalyst deactivation. For example, a simple TPO analysis on the spent catalyst may produce CO and CO2 via a reaction with O2 at high temperature and this is a strong indication that deactivation may be due to the deposition of carbon during the Sabatier reaction. Other TPX techniques such as TPR and pulse chemisorption are also valuable techniques when they are applied in situ to the fresh catalyst and then to the catalyst upon deactivation.

Interplay Between Ni and Brønsted and Lewis Acid Sites in the Hydrodesulfurization of Dibenzothiophene

“…Following synthesis, we performed nitrogen adsorption‐desorption isotherms and XRD analysis to verify our assumption (see Figures S19 and S20 in the SI). We opted for these techniques as they serve as indirect methods for assessing the dispersion of a metallic phase over a support [79–86] . In summary, the analysis of the additional tests confirmed that Ni impregnated by the SEA method does not alter the textural and structural properties of the support, unlike the wet impregnation method (see to Appendix K in the SI).…”

Synthesis and Characterization of K2O/ACT Catalyst for Biodiesel Production from Beef Fat Waste

“…The surface area of the catalyst is an essential requirement because it determines the number of active sites in the catalyst, which is related to its activity [25]. The surface area of the catalyst was determined in this study using the nitrogen adsorption-desorption method, which estimates the amount of gas adsorbed on the surface of the material described to determine the active surface area of the catalyst.…”