Inorganic materials, superconductors, glasses, ceramics, cetallurgy, catalysis, reactions and syntheses, thermal decompositionsEvidence of the role of non-stoichiometry in Zn-Cr catalysts by thermal investigations
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Cited by (10)
Direct conversion of syngas to light olefins (C2–C3) over a tandem catalyst CrZn–SAPO-34: Tailoring activity and stability by varying the Cr/Zn ratio and calcination temperature
2020, Journal of CatalysisCitation Excerpt :In addition, ZnO has been identified as the only active component, and the promoting role of Cr2O3 has been attributed to the spinel formation, ZnCr2O4, which prevented the sintering of small ZnO crystallites by providing considerable surface area and better distribution of ZnO particles. On the other hand, some studies reported that the nonstoichiometric Zn–Cr spinel was the active phase in methanol and iso-butanol synthesis [12,13,17,22–24]. Nonstoichiometry of the Zn–Cr spinel was obtained by the dissolution of excess ZnO in ZnCr2O4, which results from the solid reaction between ZnO and Cr2O3 during calcination [25].
Mesoporous oxidic holey nanosheets from Zn-Cr LDH synthesized by soft chemical etching of Cr<sup>3+</sup> and its application as CO<inf>2</inf> hydrogenation catalyst
2017, Journal of CO2 UtilizationCitation Excerpt :The broad reduction peak obtained after H2 adsorption at temperatures ranging from 300 to 500 °C was due to the presence of excess Zn active site. Since, higher is the reducibility of ZnO to free state Zn better is the catalytic activity[70,71]. Hence, this catalyst showed better catalytic activity which was due to Cr3+ depletion and through that enrichment of free state Zn as well as mesoporosity development.
Iso-butanol direct synthesis from syngas over the alkali metals modified Cr/ZnO catalysts
2015, Applied Catalysis A: GeneralCitation Excerpt :After H2 adsorption, chemical compound ZnO has become free state Zn2+; the active species in the studied reaction are free state Zn2+ inside of the non-stoichiometric spinel ZnxCr2/3(1–x)O structure. If the reducibility of non-stoichiometric spinel ZnxCr2/3(1−x)O is higher, there will be more free state Zn2+ formed from chemical compound ZnO, as a result the catalyst activity will be better [22,23]. Cr/ZnO–Li catalyst has the highest reduction temperature of 390 °C among the tested catalysts.
ZnO‒Cr2O3 + ZSM-5 catalyst with very low Zn/Cr ratio for the transformation of synthesis gas to hydrocarbons
1995, Applied Catalysis A, GeneralHydrotalcite-type anionic clays: Preparation, properties and applications.
1991, Catalysis TodayNon-Stoichiometry, a Key to Modify the Activity and Selectivity of Spinel-type Catalysts for Hydrogenation Reactions
1991, Studies in Surface Science and Catalysis