Surface chemistry and catalytic performance of chromia/alumina catalysts derived from different potassium impregnation sequences

Liu, Daolan; Peng, Peng; Wu, Pingping; Han, Dezhi; Chai, Yong‐Ming; Zhang, Yan

doi:10.1016/j.apsusc.2015.05.128

Cited by 24 publications

(14 citation statements)

References 41 publications

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“…All of the samples exhibited type IV adsorption isotherms with obvious H 2 hysteresis loops in a relative pressure ( P/P 0 ) range of 0.5–1.0. This suggesting that all samples were mesoporous materials, , which is further verified from the Barrett–Joyner–Halenda (BJH) pore size distribution data. Nitrogen adsorption–desorption results show that the MgAlO had a Brunauer–Emmett–Teller (BET) surface area of 270.8 m 2 /g and an average pore size about of 8.8 nm (Table S1).…”

Section: Resultssupporting

confidence: 68%

PtNi Bimetallic Nanoparticles on MgAlO Microflower Supports as Adsorbents for Desulfurization of Benzene

Xie

Jiang

Guo

2021

ACS Appl. Nano Mater.

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Palladium adsorbent is used in the ultradeep desulfurization process of benzene to prepare refined benzene, which is an important commercial chemical raw material in the petrochemical industry. However, with the increasing cost of palladium adsorbent, the wide application of palladium adsorbent in the benzene refining process is greatly limited. Here, we rationally designed PtNi/MgAlO adsorbent using the 3D nanomicroflower structure of MgAlO as the support and PtNi bimetallic nanoparticles as the active component. Various characterization techniques including BET, XRD, SEM, TEM, TPR, XPS, and N2-TPD were used to investigate the correlation between the adsorption performance and the microstructure of the adsorbent. The results show that the PtNi/MgAlO adsorbent exhibited an excellent adsorption sulfur capacity of 1.74 mg/g. Also, nearly 100% thiophene elimination was observed for 382 h, better than the commercial Pd/Al2O3 adsorbent. It shows great potential application in the ultradeep desulfurization of benzene.

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Section: Resultssupporting

confidence: 68%

PtNi Bimetallic Nanoparticles on MgAlO Microflower Supports as Adsorbents for Desulfurization of Benzene

Xie

Jiang

Guo

2021

ACS Appl. Nano Mater.

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“…Most strikingly, no alkynes are formed over the K-CrO x /alumina, specifically 3-methylpentyne, which was a major product via structural isomerisation over CrO x /alumina. Much of this change can be understood as a neutralisation of the acid sites on the alumina; indeed, it has been shown in a number of reports that the role of potassium is to remove acid sites [20,21,24]. Nevertheless, there is still considerable alkylation with significant yields of iso-alkanes (including methylcyclohexane) although this could be base catalysed [25,26].…”

Section: K-cro X /Aluminamentioning

confidence: 99%

Transhydrogenation of pentane and 1-hexyne over CrOx/Al2O3 and potassium-doped CrOx/Al2O3 catalysts

Garba

Jackson

2019

Appl Petrochem Res

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The transhydrogenation of pentane (P) and 1-hexyne (1HY) was investigated over 4% CrO x /Al 2 O 3 and potassium-doped 4% CrO x /Al 2 O 3 catalysts over a range of temperatures (523-773 K) with a 5:1 P:1HY ratio. Over the CrO x /Al 2 O 3 catalyst, transhydrogenation clearly occurred at temperatures below 625 K where the yield of alkenes was higher for the co-fed system than for a combination of the individual yields. Due to the acidic nature of the alumina, many of the products were alkylated olefins and alkylated hydrocarbons formed by coincident alkylation and isomerisation. When pentane was added to a feed containing 1-hexyne, the extent of carbon deposition was reduced. By comparing transhydrogenation to limited hydrogen 1-hexyne hydrogenation at 623 K, it was shown that the processes of hydrogenation and transhydrogenation were different, with hydrogenation favouring alkanes, while transhydrogenation favoured alkenes. This may be because pentane dehydrogenation only releases two hydrogen atoms, which only allows 1-hexyne to hydrogenate to 1-hexene. Therefore, if the rate of alkene isomerisation and desorption is faster than that of pentane dehydrogenation, only alkenes will be observed. The latter proposal would suggest that the dehydrogenation/hydrogenation process is closely coupled and would be consistent with pentane influencing 1-hexyne surface chemistry. The effect of the potassium doping was to increase the yield of alkenes. The reason for this may be related to changes in the nature of the surface chromia species. The potassium also neutralised the acid sites on the alumina, reducing the extent of alkylation and hydrogenolysis, which suppressed the formation of other alkynes in the product mix.

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“…Therefore, ZSM-5 is widely used in propane dehydrogenation reaction. 29,30 Besides, as advanced mesoporous materials, SBA-15 and nano-silica are oen employed as supports for catalysts. Generally, SBA-15 is characterized by its ordered porous structure, high specic surface area and high thermal stability, and the certain pore volume of mesoporous materials and the free of acid sites can greatly resist the formation of coke.…”

Section: Introductionmentioning

confidence: 99%

Catalytic performance of gallium oxide based-catalysts for the propane dehydrogenation reaction: effects of support and loading amount

et al. 2017

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Surface chemistry and catalytic performance of chromia/alumina catalysts derived from different potassium impregnation sequences

Cited by 24 publications

References 41 publications

PtNi Bimetallic Nanoparticles on MgAlO Microflower Supports as Adsorbents for Desulfurization of Benzene

PtNi Bimetallic Nanoparticles on MgAlO Microflower Supports as Adsorbents for Desulfurization of Benzene

Transhydrogenation of pentane and 1-hexyne over CrOx/Al2O3 and potassium-doped CrOx/Al2O3 catalysts

Catalytic performance of gallium oxide based-catalysts for the propane dehydrogenation reaction: effects of support and loading amount

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