Abstract
In this study, silicoaluminophosphate (SAPO)-34 and Me (Me = Cr, Co)-modified SAPO-34 were synthesized and used as catalysts to investigate the catalytic performance by means of a probe reaction from ethanol to ethylene. The metal oxides were loaded on the SAPO-34 support via an impregnation method. The synthesized catalysts were characterized using XRD, SEM, EDX, FT-IR, NH3-TPD, BET, and TGA techniques. Compared to SAPO-34, SAPO-34 doped with metal oxides showed the same chabazite (CHA) topology. The structure and properties of the catalyst were further optimized by varying the amount of Me. The experimental results showed that Co-Cr/SAPO-34 exhibited the best catalytic performance when the reaction temperature reached 400 °C at a weight hourly space velocity (WHSV) of 3.5 h−1, for which the single-pass conversion of ethanol was determined as 99.15%, and the selectivity of ethylene was 99.4% at an optimum catalytic performance in the reaction of up to 600 min. In addition, Co-Cr/SAPO-34 exhibited better catalytic activity and anti-coking ability than pure SAPO-34, which was attributed to its enhanced pore structure and moderate acidity. It can also be concluded from the results of this experiment that the performance of the Co-Cr bimetal-supported catalyst is better than that of the Cr mono-metal catalyst.
Highlights
Ethylene, as the core elemental component of the petrochemical industry, is attributed to more products than petrochemical products produced globally
SAPO-34 doped with doped different metals was successfully
Co heteroatoms and oxygen in the of SAPO-34 inner and space the formation of metal oxides. These results demonstrate no impurities during corresponding point mapping indicated the successful synthesis of SAPO-34 and the formation of the synthesismetal process
Summary
As the core elemental component of the petrochemical industry, is attributed to more products than petrochemical products produced globally. It was well known that the formation of methane was usually accompanied by rapid deactivation due to extra hydrogen being drawn out from the residual hydrocarbons; the lifetime of CoAPSO-34 may be correspondingly prolonged Another investigation by Hotevar and Levec [18] that involved the preparation of MeAPSO-34 (Me = Co, Mn, Cr) catalyst via an isomorphous substitution method showed that CrAPSO-34 possessed better catalytic activity than CoAPSO-34 and MnAPSO-34 catalysts, and the selectivity for the formation of low olefins was observed to decrease rapidly with time on stream for MeAPSO-34 as a consequence of coking. The catalytic performance was maintained constant with a slow reduction with the Catalysts 2020, 10, x FOR PEER REVIEW can effectively improve the ethanol conversion and ethylene selectivity, and the best yield of ethylene was up to 97.8% over Mn-SAPO-34 at optimal reaction conditions: Loading amount 5%, WHSV 2 h−1, reaction temperature 340 °C [6].
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