A Highly Active and Selective Nanocomposite Catalyst for C<sub>7+</sub> Paraffin Isomerization

Xu, Jinsuo; Ying, Jackie Y.

doi:10.1002/anie.200600377

Cited by 24 publications

(15 citation statements)

References 24 publications

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“…When the molar ratio of Ce to Pt was larger than 10 : 1, the dispersion of Pt was lager than 100%. This can be caused by the spillover hydrogen; however, the previous investigation showed that this spillover hydrogen also favored the isomerization of paraffins [28] . Table 2 shows the stabilized conversion of n-heptane, the yield for mono-and multi-branched products, and the selectivity for branched products at 250℃ and 120 min on stream over various catalysts.…”

Section: Resultsmentioning

confidence: 90%

Hydroisomerization of n-heptane over bimetal-bearing H3PW12O40 catalysts supported on dealuminated USY zeolite

Wei

Wang

2008

Sci. China Ser. B-Chem.

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The bimetal-bearing (CePt or LaPt) 12-tungstophosphoric acid (H 3 PW 12 O 40 (PW)) catalysts supported on dealuminated USY zeolite (DUSY) were prepared by impregnation and characterized by XRD, BET, IR, and H 2 -chemisorption. Their catalytic activities were tested in the hydroisomerization of n-heptane with a continuous atmospheric fixed-bed reactor. After the steam treatment combined with the acid leaching, as well as the supporting with PW and the bimetals, the DUSY support retains the Y zeolite porosity and the PW well keeps its Keggin structure in catalysts. The doping of Ce into the catalysts enhances the dispersion of Pt on the catalyst surface. The Pt-bearing PW catalysts doped with Ce or La, especially Ce, exhibit much higher catalytic activity and selectivity than the catalysts without dopants at lowered reaction temperatures. At the optimal reaction conditions, i.e., the reaction temperature of 250 ℃ and WHSV of 1.4 h −1 , the catalyst with a Pt loading of 0.4%, PW loading of 10% and a molar ratio of Ce to Pt of 15 : 1 shows a conversion of n-heptane of 70.3% with a high selectivity for isomerization products of 94.1%. hydroisomerization of n-heptane, bimetal catalyst, heteropoly acid, USY, platinum Branched paraffins are increasingly important elements for gasoline pool with high octane number due to the more and more stringent environmental legislations regarding the advanced liquid fuel [1] . Hydroisomerization of C 5 /C 6 is a commercial approach to achieve light isoparaffins. Nowadays, hydroisomerization of paraffins with the chain-length longer than C 6 is highly desirable because the new standard of gasoline demands to reduce the content of aromatics and olefins [1][2][3][4] . However, the well known Pt/mordenite catalyst would crack the n-heptane, which results in a higher consumption of hydrogen, lower liquid yield, and faster catalytic deactivation [2] . Therefore, many efforts have been devoted to seeking effective catalysts which can promote the selectivity of the branched paraffins in the hydroisomerization of paraffins with the chain-length longer than C 6 [2,4] . Heteropoly acids (HPAs) with the Keggin structure are one of superacids and have attracted great research interests as catalysts because of their strong Brönsted acidity and unique "pseudo-liquid" characteristic [5][6][7] . However, pure HPAs as heterogeneous catalysts are hindered by their low specific surface area (<10 m 2 /g), low thermal stability and high solubility in polar reaction medias [8,9] . In order to overcome these disadvantages, many efforts have been devoted to supporting HPAs systems. A great variety of supports have been investigated, such as silica [10] , silica-alumina [11] , activated car-

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Section: Resultsmentioning

confidence: 90%

Hydroisomerization of n-heptane over bimetal-bearing H3PW12O40 catalysts supported on dealuminated USY zeolite

Wei

Wang

2008

Sci. China Ser. B-Chem.

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“…Nanocomposite materials of type Pt/WO 3 /ZrO 2 , involving highly dispersed WO 3 domains and Pt nanoclusters supported on ZrO 2 nanocrystals, also showed a superior activity and selectivity for C 7+ paraffin hydroisomerization. 127 For example, 80-90% conversions with 80-82% isomerization selectivities were reached for n-heptane and n-octane working at 150 • C.…”

Section: Other Rearrangementsmentioning

confidence: 99%

Nanocatalysts for Rearrangement Reactions

García‐Álvarez

García‐Garrido

Cadierno

2013

Nanocatalysis Synthesis and Applications

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“…Pt(0,5%)W 7.5 Z 1.0 Si performed best in n-octane isomerization with the following selectivities within the iso-octanes: S monobranched = 69.5%, S dibranched = 23.3%, and S tribranched = 7.2%. Multicomponent nanocomposite catalysts of the type Pt/WO 3 /M-ZrO x were also tested in the n-heptane hydroisomerization (398-473 K) [11]. At 398 K under trickle bed conditions, 30% n-C 7 was converted with an isomerization selectivity of more than 99% using a Pt/WO 3 / Al-ZrO x catalyst (p = 8 bar, H 2 /n-C 7 = 1, volume hour space velocity = 1 h À1 ).…”

Section: Introductionmentioning

confidence: 99%

Enhanced activity and selectivity in n-octane isomerization using a bifunctional SCILL catalyst

Meyer

Hager

Schwieger

et al. 2012

Journal of Catalysis

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A Highly Active and Selective Nanocomposite Catalyst for C₇₊ Paraffin Isomerization

Cited by 24 publications

References 24 publications

Hydroisomerization of n-heptane over bimetal-bearing H3PW12O40 catalysts supported on dealuminated USY zeolite

Hydroisomerization of n-heptane over bimetal-bearing H3PW12O40 catalysts supported on dealuminated USY zeolite

Nanocatalysts for Rearrangement Reactions

Enhanced activity and selectivity in n-octane isomerization using a bifunctional SCILL catalyst

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A Highly Active and Selective Nanocomposite Catalyst for C7+ Paraffin Isomerization

Cited by 24 publications

References 24 publications

Hydroisomerization of n-heptane over bimetal-bearing H3PW12O40 catalysts supported on dealuminated USY zeolite

Hydroisomerization of n-heptane over bimetal-bearing H3PW12O40 catalysts supported on dealuminated USY zeolite

Nanocatalysts for Rearrangement Reactions

Enhanced activity and selectivity in n-octane isomerization using a bifunctional SCILL catalyst

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A Highly Active and Selective Nanocomposite Catalyst for C₇₊ Paraffin Isomerization