Isomerization of n-butane to isobutane over Pt-modified Beta and ZSM-5 zeolite catalysts: Catalyst deactivation and regeneration

Villegas, J.I.; Kumar, Narendra; Heikkilä, Teemu; Lehto, Vesa‐Pekka; Salmi, Tapio; Murzin, Dmitry Yu.

doi:10.1016/j.cej.2006.03.011

Cited by 44 publications

(34 citation statements)

References 13 publications

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“…The ratio of soluble to insoluble coke (i.e., the ratio of coke content from the reacted catalyst to coke content of the fatty acid washed catalyst) was 17:3 by weight, as shown in Table 4. This result is in agreement with a study by Villegas et al [18], which shows an insoluble coke content on a hydroisomerization Pt zeolite catalyst of 13%-20%. The reduction in product yield for the recycled catalyst was 44% to 27%, giving a 40% reduction.…”

Section: Catalyst Recyclesupporting

confidence: 83%

Use of Isomerization and Hydroisomerization Reactions to Improve the Cold Flow Properties of Vegetable Oil Based Biodiesel

Reaume

Ellis

2013

Energies

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Abstract:Biodiesel is a promising alternative to petroleum diesel with the potential to reduce overall net CO 2 emissions. However, the high cloud point of biodiesel must be reduced when used in cold climates. We report on the use of isomerization and hydroisomerization reactions to reduce the cloud point of eight different fats and oils. Isomerization was carried out at 260 °C and 1.5 MPa H 2 pressure utilizing beta zeolite catalyst, while hydroisomerization was carried out at 300 °C and 4.0 MPa H 2 pressure utilizing 0.5 wt % Pt-doped beta zeolite catalyst. Reaction products were tested for cloud point and flow properties, in addition to catalyst reusability and energy requirements. Results showed that high unsaturated fatty acid biodiesels increased in cloud point, due to the hydrogenation side reaction. In contrast, low unsaturated fatty acid biodiesels yielded cloud point reductions and overall improvement in the flow properties. A maximum cloud point reduction of 12.9 C was observed with coconut oil as the starting material. Results of the study have shown that branching can reduce the cloud point of low unsaturated fatty acid content biodiesel.

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Section: Catalyst Recyclesupporting

confidence: 83%

Use of Isomerization and Hydroisomerization Reactions to Improve the Cold Flow Properties of Vegetable Oil Based Biodiesel

Reaume

Ellis

2013

Energies

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“…A more detailed study on the deactivation of Beta zeolite in a related reaction, i.e. isomerization of n-butane, can be found elsewhere [10]. Due to all these observations, it is then possible to believe that Beta zeolite is in fact a material that could be specifically tailored for the oligomerization of 1-butene, tuning its physico-chemical properties to produce higher yields of high-octane components.…”

Section: Dimerization Of 1-butenementioning

confidence: 96%

A study on the dimerization of 1-butene over Beta zeolite

et al. 2007

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“…Analysis of the product distribution reveals that the results presented here are well in line with this reaction network. Zeolites like H-ZSM-5 and H-Beta are materials with a considerable amount of acid sites, especially strong Brønsted acid sites (defined as their ability to retain chemisorbed pyridine at 723 K), but the number of the strong acid sites can be lost after an introduction of a metal into the zeolite [26,27]. On the other hand, H-MCM-41 is considered as a mildly acidic material having negligible amount of the strong Brønsted acid sites [28].…”

Section: Effect Of Copper Ion-exchangementioning

confidence: 99%

Radioisotopic tracing of methanol transformation using 11C-labelled methanol over copper ion-exchanged H-ZSM-5, H-Beta and H-MCM-41

et al. 2007

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Short half-life 11 C-radioisotope tracer in methanol form was used to study the transformation of methanol over copper ionexchanged H-ZSM-5, H-Beta and H-MCM-41 catalysts. The progresses of adsorption and desorption as well as methanol transformation were followed by radiodetection. The reaction products were analyzed by radio-gas chromatography. The GC analysis was completed with a radiodetector that could distinguish the radiolabelled derivates from other non-radioactive compounds, reagents or impurities. The radiodetector can be more sensitive to detect smaller amount of compound than the thermal conductivity detector or flame ionization detector since the intensity of a radio-signal is independent on thermal conductivity or ionization energy of compounds. The copper introduction into the catalysts had an inhibitory effect on the reaction to proceed further from the equilibration with the methanol and dimethyl ether resulting in hydrocarbons C 3 -C 6 . Presence of copper also allowed a possible reaction route for methanol to give formaldehyde and methyl formate.

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Isomerization of n-butane to isobutane over Pt-modified Beta and ZSM-5 zeolite catalysts: Catalyst deactivation and regeneration

Cited by 44 publications

References 13 publications

Use of Isomerization and Hydroisomerization Reactions to Improve the Cold Flow Properties of Vegetable Oil Based Biodiesel

Use of Isomerization and Hydroisomerization Reactions to Improve the Cold Flow Properties of Vegetable Oil Based Biodiesel

A study on the dimerization of 1-butene over Beta zeolite

Radioisotopic tracing of methanol transformation using 11C-labelled methanol over copper ion-exchanged H-ZSM-5, H-Beta and H-MCM-41

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