Dehydrogenation of i-Butane on CrOx/SiO2 Catalysts

Hakuli, A.; Harlin, M.E.; Backman, Leif; Krause, A.O.I.

doi:10.1006/jcat.1999.2468

Cited by 104 publications

(45 citation statements)

References 38 publications

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“…As the loading increases from 0.5 to 5% it is noticed that there is slight increase in intensity of the peak at 33.6° 2θ. This peak corresponds to chromium oxide(Cr 2 O 3 ) confirming the presence of chromium on the 5 wt% Cr loaded sample [11].…”

Section: Resultsmentioning

confidence: 64%

Catalytic cracking of naphtha: The effect of Fe and Cr impregnated ZSM-5 on olefin selectivity

2018

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This study focuses on the modification of ZSM-5 in order to enhance the catalytic cracking of refinery naphtha to produce light olefins. ZSM-5 was metal modified using different loadings (0.5-5 wt%) of Fe and Cr via the impregnation method. The metal modified ZSM-5 samples are compared and the effect of metal loading on the physicochemical properties and catalytic performance is investigated. Fe and Cr modification had an effect on both the physicochemical properties of the catalysts as well as catalytic activity and selectivity. Metal loading caused a decrease in the specific surface area which decreased further with increased metal loading. Fe had a greater effect on the total acidity in particular strong acid sites when compared to Cr. The optimum Fe loading was established which promoted selectivity to olefins, in particular propylene. Fe also had a dominant effect on the P/E ratio of which a remarkable ratio of five was achieved as well as enhanced the stability of the catalyst. Cr was found to be a good promoter for selectivity to BTX products with a two-fold increase observed when compared to Fe-modified catalysts.

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Section: Resultsmentioning

confidence: 64%

Catalytic cracking of naphtha: The effect of Fe and Cr impregnated ZSM-5 on olefin selectivity

2018

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“…6? can be reduced also to Cr 2? when they are present on the a-Cr 2 O 3 surface or supported on silica [22]. However water can re-oxidize back Cr 2?…”

Section: Temperature Programmed Reduction Studiesmentioning

confidence: 95%

Bimetallic Au–Cu, Ag–Cu/CrAl3O6 Catalysts for Methanol Synthesis

et al. 2009

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“…Besides the surface acidity properties, the distribution Page 4 of 40 A c c e p t e d M a n u s c r i p t of chromium species and correspondingly the reducibility of catalysts were also reported to be influenced by potassium addition amount [9]. With potassium content increasing, the Cr 6+ content was reported to increase and that of Cr 3+ which was considered to be the active species [7,10], remained almost the same or decreased slightly, resulting in the increase of the Cr 6+ /Cr 3+ ratio.…”

Section: Introductionmentioning

confidence: 94%