2019
DOI: 10.3390/cryst10010007
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Synergetic Impact of Secondary Metal Oxides of Cr-M/MCM41 Catalyst Nanoparticles for Ethane Oxidative Dehydrogenation Using Carbon Dioxide

Abstract: Oxidative dehydrogenation of alkanes to alkenes by a mild oxidant such as carbon dioxide is an active area of research. A series of MCM41-supported bimetallic oxide catalysts containing chromium oxide in addition to metal oxides (Ce, Co, Zn, V, Nb, and Mo) has been prepared. The binary catalysts have Cr metal oxide incorporated into MCM41 structure while the other oxides are either incorporated with Cr or impregnated on the MCM41 surface. The synthesized catalysts were characterized by X-ray diffraction (XRD),… Show more

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Cited by 9 publications
(5 citation statements)
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“…The highest values of conversion and yield were 52.3% and 48.0%, respectively, at 700 • C. A further increase in the titania content led to a drop in both ethane conversion and ethylene yield due to the formation of less or non-active Cr species. The recorded ethylene selectivity over all tested catalysts was more than 90%, which agrees with the literature over similar catalytic system (Cr/silica) [14,15,22,63,64,67]. Hence, the Cr(8)/Ti(2.2)-Si catalyst is superior among other catalysts at all reaction temperatures.…”
Section: Catalytic Activitysupporting
confidence: 88%
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“…The highest values of conversion and yield were 52.3% and 48.0%, respectively, at 700 • C. A further increase in the titania content led to a drop in both ethane conversion and ethylene yield due to the formation of less or non-active Cr species. The recorded ethylene selectivity over all tested catalysts was more than 90%, which agrees with the literature over similar catalytic system (Cr/silica) [14,15,22,63,64,67]. Hence, the Cr(8)/Ti(2.2)-Si catalyst is superior among other catalysts at all reaction temperatures.…”
Section: Catalytic Activitysupporting
confidence: 88%
“…However, catalytic ethane dehydrogenation using oxygen or carbon dioxide has been proposed as a good alternative to the thermal cracking process [9][10][11][12]. Nevertheless, the flammability of reactants mixture, exothermic nature of the reaction and over-oxidation of ethylene represent the obstacles of the dehydrogenation of ethane with oxygen [13][14][15].…”
Section: Introductionmentioning
confidence: 99%
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“…For all samples, the conversion of ethane and the yield of ethylene decreased slowly over catalytic time, proposing a slight de-activation of the tested catalysts. Unlike our previously [3,12,46] investigated catalytic systems, deactivation of the Cr(x)/MOS catalytic system declined approximately 22% after 10 h of on-stream operation. For instance, using large-pore mesoporous silica as a support for the chromium-based catalytic system led to the same catalytic activity (50.5% and 91.1% conversion of ethane and selectivity of ethylene, respectively), but with 39% declination in the catalytic activity for the same reaction conditions [43].…”
Section: Catalytic Performance Of Cr(x)/mos Catalystscontrasting
confidence: 79%
“…Following these leads, recently the synergetic effect of the addition of a second metal oxide (Co, Ce, Zn, Nb, V, and Mo) to the Cr-MCM-41 sample, over the textural, physicochemical and catalytic properties, was investigated. 1077 Accordingly MCM-41-supported bimetallic oxides containing Ce, Co, and Zn were prepared following one-pot synthesis, while samples containing Mo, V and Nb were prepared following a two steps synthesis (hydrothermal + impregnation). The mesoporous structure of MCM-41 and high BET surface area were maintained after the incorporation of both metal oxides.…”
Section: Catalytic Conversion Of Co2mentioning
confidence: 99%