The Shape Selectivity in the Skeletal Isomerisation ofn-Butene to Isobutene

Houžvička, J.; Hansildaar, S.; Ponec, V.

doi:10.1006/jcat.1997.1525

Cited by 90 publications

(39 citation statements)

References 13 publications

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“…Modifications decreased selectivity toward the by-products, pentene, ethylene and propylene, strongly but not all with the same trend. Houzvicka et al [6] and Lee et al [26] stated that strong acid sites present on zeolites were responsible for the formation of by-products mainly propane and propylene, through the bimolecular mechanism. As discussed in the introduction, bimolecular reactions involve cracking reactions.…”

Section: Reaction Testsmentioning

confidence: 99%

“…Three different mechanisms, monomolecular, bimolecular and pseudo-monomolecular, have been proposed in the literature for skeletal isomerization of n-butene [1,[6][7][8][9][10]. Monomolecular mechanism occurs on the Brønsted acid sites of the catalyst.…”

Section: Introductionmentioning

confidence: 99%

“…The most promising catalysts for the selective isomerization of n-butenes are found to be 10-membered ring (10-MR) molecular sieves, such as ferrierite, SAPO-11 and ZSM-22 [6] and ZSM-5 zeolites [11]. Their pore sizes are optimal for nbutene diffusion, and they can suppress the bimolecular mechanism.…”

Section: Introductionmentioning

confidence: 99%

“…Houzvicka et al [6] tried to change acidity of H-ZSM5 by isomorphous substitution of different metals (Ga, Fe, B) into its lattice. It was found that acidity of the catalysts was not significantly affected; as a result, selectivity to isobutene was not improved.…”

Section: Introductionmentioning

confidence: 99%

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Effect of different acidity modifications on the activity and selectivity on H-ZSM5 zeolites in n-butene isomerization

Kılıç

2014

Reac Kinet Mech Cat

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H-ZSM-5 was modified by silylation [tetraethylorthosilicate (TEOS) and triaminopropyltriethoxysilane], alkali (NaOH), acid (HCl) and ammoniumhexafluorosilicate (AHFS) treatments. The parent and modified zeolite forms were tested in n-butene isomerization. Modifications affected total acidities, the strength of the acid sites, pore sizes and surface areas of the H-ZSM-5 differently. The modifications decreased the conversion obtained by the parent catalyst. TEOS and alkali modifications did not promote formation of isobutene. Pre-alkali treatment before acid treatment increased selectivity to isobutene from 56.0 to 66.7 %, while conversion changed a little, it dropped from 52 to 50 %. AHFS modification provided the highest enhancement in selectivity to isobutene (87.5 %) for which n-butene conversion was dropped by about 10 % compared to H-ZSM-5. This was attributed to a slight modification of the pore size and to the reduction in strong and weak acid sites and generation of new Lewis acid sites.

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Section: Reaction Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of different acidity modifications on the activity and selectivity on H-ZSM5 zeolites in n-butene isomerization

Kılıç

2014

Reac Kinet Mech Cat

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“…It is reported that the hydrogen transfer reaction can occur between dimerized products from activated alkenes and other hydrocarbons in the cavities located in the intersection of 10-MR channel [27,28]. Considering the larger pore size of MCM-22 (12-and 10-MR) and its special acidity, it is reasonable that such enough space would enable carbonium ion to take the inter-molecular hydrogen transfer reaction more easily.…”

Section: The Performance Of Mcm-22/zsm-35 Composites Catalyst For Fccmentioning

confidence: 99%

Synthesis and Catalytic Reactivity of MCM-22/ZSM-35 Composites for Olefin Aromatization

et al. 2005

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A series of MCM-22/ZSM-35 composites has been hydrothermally synthesized and characterized by XRD, SEM, particle size distribution analysis, N 2 adsorption and NH 3 -TPD techniques. Pulse and continuous flow reactions were carried out to evaluate the catalytic performances of these composites in aromatization of olefins, respectively. It was found that MCM-22/ZSM-35 composites could be rapidly crystallized at 174°C with an optimal gel composition of SiO 2 /Al 2 O 3 =25, Na 2 O/SiO 2 =0.11, HMI/ SiO 2 =0.35, and H 2 O/SiO 2 =45 (molar ratio), of which the weight ratio of ZSM-35 zeolite in the composite relied on the crystallization time. The coexistence of MCM-22 and ZSM-35 in the composite (MCM-22/ZSM-35=45/55 wt/wt) was observed to exert a notable synergistic effect on the aromatization ability for butene conversion and FCC gasoline updating, possibly due to the intergrowth of some MCM-22 and ZSM-35 layers.

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Carbon Gels in Catalysis

Moreno‐Castilla

2008

Carbon Materials for Catalysis

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The Shape Selectivity in the Skeletal Isomerisation ofn-Butene to Isobutene

Cited by 90 publications

References 13 publications

Effect of different acidity modifications on the activity and selectivity on H-ZSM5 zeolites in n-butene isomerization

Effect of different acidity modifications on the activity and selectivity on H-ZSM5 zeolites in n-butene isomerization

Synthesis and Catalytic Reactivity of MCM-22/ZSM-35 Composites for Olefin Aromatization

Carbon Gels in Catalysis

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