Exploring the role of promoters (Au, Cu and Re) in the performance of Ni–Al layered double hydroxides for water-gas shift reaction

Tabakova, T.; Gabrovska, Margarita; Nikolova, D.; Ivanov, Ivan B.; Venezia, Anna Maria; Tenchev, K.

doi:10.1016/j.ijhydene.2022.04.123

Cited by 9 publications

(1 citation statement)

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“…In our latest research, the effect of a Re additive has been evaluated as a promoter in the performance of NiAl layered double hydroxides (LDHs) aimed at looking for novel catalyst formulations with a high efficiency range at low-temperature operation (200-250 • C) and improved economic profitability for the traditional water-gas shift reaction [18]. NiAl and CeNiAl LDHs doped by 3 wt.% Re attained a WGS activity of 90% CO conversion at 260 • C. Re/NiAl LDH samples demonstrated considerable stability, which motivated the future development of this catalyst composition.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Ability of K- and Co-Promoted Oxo-Re and Oxo-ReMo Nanosized Compositions for Water–Gas Shift Reaction

Nikolova,

Ivanov,

Vakros

et al. 2023

Catalysts

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The water–gas shift (WGS) reaction (CO + H2O ↔ CO2 + H2) plays an important role in the hydrogen economy because it is an effective way to reduce the carbon release to net-zero CO2 emissions. The general goal of this research is to develop nanosized oxo-rhenium catalyst formulations promoted by K and Co components for the WGS process. Rhenium, as a low-cost catalyst component, is a good choice compared to platinum group metals. A surface density of 2 Re atoms/nm2 on a γ-Al2O3 support as well as cobalt (3 wt.% CoO) and potassium (5 wt.% K2O) amounts were chosen to match the composition of our own active sour WGS KCoRe catalyst developed some years ago. An initial evaluation of the impact of replacing half of the rhenium with molybdenum, which is more affordable, was also studied. The purpose of this study is to explore the catalytic ability of CoRe, K-CoRe, CoReMo, and K-CoReMo formulations in the WGS reaction and elucidate the effect of a CO/Ar reaction mixture used in an activation–reduction pretreatment to form active catalyst structures. Oxo-K-Co-Re(Mo) entities formed in synthesized samples and their reducibility were analyzed via several physicochemical methods, such as N2 physisorption, PXRD, UV-vis DRS, and H2-TPR. In summary, the selected potassium- and cobalt-promoted Re-containing formulations have potential as catalysts for the classical WGS reaction. The selection of an appropriate procedure for activation–reduction, involving the reducing gas (CO or H2), temperature, and duration, was needed for tuning the K-CoRe catalyst’s high activity for the WGS reaction with structural stability and longevity.

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Section: Introductionmentioning

confidence: 99%