Preferential oligomerization of isobutene in a mixture of isobutene and 1-butene over sodium-modified 12-tungstosilicic acid supported on silica

Zhang, Jin; Kanno, Mitsuru; Zhang, Jiao; Ohnishi, Ryuichiro; Toriyabe, Kakeru; Matsuhashi, Hiromi; Kamiya, Yuichi

doi:10.1016/j.molcata.2010.04.017

Cited by 11 publications

(8 citation statements)

References 16 publications

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“…Sulfated titania (TiO 2 ) catalysts with Lowry/Brønsted ratios of 1.25−3.65 were modified with sulfuric acid, 111 and tetrapropyl ammonium bromide (TPABr) and tetraethyl ortho silicate (TEOS) were utilized in the silicalite membrane synthesis with the typical synthesis of TPABr/TEOS/SiO 2 /H 2 O/KOH/NaOH = 1:20:21:560− 788:0.9:3. 84,114,115 The selectivity of TEB was increased with higher Ni loading, 94 increased Na + cation content, 108 and higher isobutylene concentration. 107 However, the selectivity of TEB was decreased with lower pressure 101 and space velocity.…”

Section: Oligomerization Of Isobutylenementioning

confidence: 99%

“…97 Teraisobutylene (TEB) was obtained from the oligomerization reaction between TIB and isobutylene with the number of carbon atoms greater than C 12 . The catalysts utilized in oligomerization of isobutylene were Na 3 HSiW 12 O 40 /SiO 2 , 108 A-15, A-35 with acid capacity of 5.2 mequiv H + /g, A-DT with acid capacity of 3.1 mequiv H + /g, A-31 with acid capacity of 4.8 mequiv H + /g, 105 and Dowex 50 with acid capacity of 5.02 mmolqv H + /g. 109 Zeolites such as USY (3D), Y (3D), beta (3D), mordenite (1D), ZSM-5 (3D), and FER (2D) with a surface area of 400−720 m 2 /g 97,98,105,109 were successfully utilized in the oligomerization reaction.…”

Section: Oligomerization Of Isobutylenementioning

confidence: 99%

“…Other catalysts such as MFI (silicalite) with a pore diameter of 500 nm in ZMR, W 2 O 3 /Al 2 O 3 , or H 4 SiW 12 O 40 /SiO 2 modified by Na + cation, and sulfated titania , were also used in the synthesis. Sulfated titania (TiO 2 ) catalysts with Lowry/Brønsted ratios of 1.25–3.65 were modified with sulfuric acid, and tetrapropyl ammonium bromide (TPABr) and tetraethyl ortho silicate (TEOS) were utilized in the silicalite membrane synthesis with the typical synthesis of TPABr/TEOS/SiO 2 /H 2 O/KOH/NaOH = 1:20:21:560–788:0.9:3. ,, …”

Section: Oligomerization Of Isobutylenementioning

confidence: 99%

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Conversion of Isobutylene to Octane-Booster Compounds after Methyl tert-Butyl Ether Phaseout: The Role of Heterogeneous Catalysis

Mahdi

Muraza

2016

Ind. Eng. Chem. Res.

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Over the last decades, the global demand of the production of methyl tert-butyl ether (MTBE) was significantly decreased from 30 million tons per year (MTPY) in 1995 to 12 million tons per year (MTPY) in 2011 because of the phaseout of MTBE in the United States and other countries. MTBE was banned in some countries because it produces health and environmental pollution and contaminates water and air quality. After MTBE phaseout, isobutylene feedstock is used for the production of another octane booster compound such as isooctane with a more environmental-friendly reputation. Isooctane is obtained by dimerization, trimerization, and oligomerization of isobutylene followed by a hydrogenation step. Dimerization of isobutylene to isooctane is a simple and low-cost-effective technology using heterogeneous catalysts such as zeolites, metal oxides, and resins. Zeolites are potential catalyst with high selectivity, high stability, easy regeneration, and low-cost production. The conversion and selectivity can be increased with higher acid strength, a larger dimensional channel, and higher pore size. USY zeolite (FAU topology) is a promising zeolite framework to be improved in the dimerization of isobutylene. Further improvement of USY zeolite has been emphasized as needed to develop better dimerization catalysts.

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Section: Oligomerization Of Isobutylenementioning

confidence: 99%

Section: Oligomerization Of Isobutylenementioning

confidence: 99%

Section: Oligomerization Of Isobutylenementioning

confidence: 99%

See 1 more Smart Citation

Conversion of Isobutylene to Octane-Booster Compounds after Methyl tert-Butyl Ether Phaseout: The Role of Heterogeneous Catalysis

Mahdi

Muraza

2016

Ind. Eng. Chem. Res.

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“…Ammonia is often used as a probe molecule for the determination of the acidity of the solids, for example by studying its adsorption by microcalorimetry or its desorption from a catalyst previously saturated with it (TPD) [43][44][45]. We used these two methods in order to compare the acidity of the impregnated and encapsulated catalysts as the catalytic reactivity had shown a difference in the behavior of the HSiW@SBA-15 system compared to the three other ones.…”

Section: Study Of the Acidity Of The Catalysts By Adsorptiondesorptiomentioning

confidence: 99%

Comparison of the Acidity of Heteropolyacids Encapsulated in or Impregnated on SBA-15

Pinto

Szeto

Oueslati

et al. 2016

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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-Heteropolyacids (HPA) immobilized onto SBA-15 silica were prepared by two different ways using either impregnation or encapsulation methodologies. Two Keggin-type HPA, H 3 PW 12 O 40 and H 4 SiW 12 O 40 were considered in this study. The resulting hybrid materials were fully characterized by N 2 adsorption-desorption isotherms, XRD, FT-IR, Raman, diffuse reflectance UV-Vis spectroscopies and 31 P MAS NMR. All characterization methods showed that at room temperature the catalysts contained well-dispersed and intact Keggin units throughout the solid. The catalytic activity of these solids was investigated in the isomerization of n-hexane. The impregnated and encapsulated phosphotungstic catalysts performed similarly in catalysis showing that the amount of active sites was nearly the same in both catalysts. On the contrary, the tungstosilicic encapsulated material was completely inactive while its impregnated counterpart was even more active than the phosphotungstic derived catalysts. The acidity of the solids was measured by various methods: microcalorimetry of ammonia adsorption, ammonia desorption followed by Temperature Programmed Desorption (TPD) and DRIFT/GC-MS and pyridine adsorption followed by infrared spectroscopy. Only pyridine adsorption and ammonia desorption followed by DRIFT/GC-MS agreed with the catalytic data. Ammonia adsorption followed by microcalorimetry was not able to differentiate between the four catalysts while the TPD experiments led to unreliable results, as not only the evolved ammonia but also other molecules such as water were taken into account in the measurements. The behavior difference between the encapsulated silico-and phosphotungstic acids was explained by a more pronounced encapsulation in the case of silicon. de préparation. L'activité catalytique de ces matériaux a ensuite été étudiée dans l'isomérisation du n-hexane.

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“…As olefin dimerization and trimerization are reactions for which the activity and selectivity strongly depend on the catalyst acidity, treat-ment of various oxides with sulfates, tungstates or phosphates has been widely recommended by several authors to modify the acidic properties [5][6][7]. Several solid acid catalysts such as titanium oxide [5,8] and zirconium oxide [6,9,10], heteropoly acid [11], and zeolites [12][13][14] have been suggested for the dimerization and trimerization reaction. In the present work, Saudi kaolinite clay has been treated by sulphuric acid and tested as solid acid catalyst for the oligomerization of isobutene.…”

Section: Introductionmentioning

confidence: 99%

Gas Phase Oligomerization of Isobutene over Acid Treated Kaolinite Clay Catalyst

Al-Dhayan

Aouissi

2016

Bull. Chem. React. Eng. Catal.

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Natural Kaolin Clay was calcined and treated by sulfuric acid. The resulting solid acid catalyst was characterized by FTIR, TGA, and X-ray powder diffraction (XRD) and tested for isobutene oligomerization in a gas phase. The characterization results showed that the acid treated clay underwent chemical and structural transformations. After acid treatment, the Si/Al ratio was increased, and the crystalline raw clay became amorphous. The effects of various parameters such as reaction temperature, reaction time and contact time on isobutene oligomerization were investigated. Catalytic tests showed that isobutene oligomerization led to dimers and trimers as major products. Tetramers were obtained as byproducts. At relatively high reaction temperatures and long contact times, the conversion was enhanced while the selectivity of dimers was decreased in favor of higher oligomers.

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Preferential oligomerization of isobutene in a mixture of isobutene and 1-butene over sodium-modified 12-tungstosilicic acid supported on silica

Abstract: ABSTRACT

Cited by 11 publications

References 16 publications

Conversion of Isobutylene to Octane-Booster Compounds after Methyl tert-Butyl Ether Phaseout: The Role of Heterogeneous Catalysis

Conversion of Isobutylene to Octane-Booster Compounds after Methyl tert-Butyl Ether Phaseout: The Role of Heterogeneous Catalysis

Comparison of the Acidity of Heteropolyacids Encapsulated in or Impregnated on SBA-15

Gas Phase Oligomerization of Isobutene over Acid Treated Kaolinite Clay Catalyst

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