Pt-Mg-Ir/Al2O3 and Pt-Ir/HY zeolite catalysts for SRO of decalin. Influence of Ir content and support acidity

D'ippolito, Silvana Andrea; Gutierrez, Laura Beatriz; Vera, Carlos Román; Pieck, C.L.

doi:10.1016/j.apcata.2012.12.002

Cited by 21 publications

(14 citation statements)

References 73 publications

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“…Since the industrial revolution in the 19th century, the majority of anthropogenic CO 2 emissions have been attributed to the consumption of fossil fuels [ 6 , 7 , 8 , 9 , 10 , 11 , 12 ], resulting in environmental pollution and very probably in increased global warming effect. In this context, a challenge for 21st century is the control of technological processes, developing highly active and selective reaction systems with atom efficiency and minimizing unwanted secondary reactions [ 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ]. Excessive CO 2 emissions have caused global climate change and increased planetary temperatures; more specifically, the global surface temperature has increased by 0.74 °C over the past century.…”

Section: Introductionmentioning

confidence: 99%

Nanoporous Materials as New Engineered Catalysts for the Synthesis of Green Fuels

Fechete

Védrine

2015

Molecules

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This review summarizes the importance of nanoporous materials and their fascinating structural properties with respect to the catalytic and photocatalytic reduction of CO2 to methane, toward achieving a sustainable energy supply. The importance of catalysis as a bridge step for advanced energy systems and the associated environmental issues are stressed. A deep understanding of the fundamentals of these nanoporous solids is necessary to improve the design and efficiency of CO2 methanation. The role of the support dominates the design in terms of developing an efficient methanation catalyst, specifically with respect to ensuring enhanced metal dispersion and a long catalyst lifetime. Nanoporous materials provide the best supports for Ni, Ru, Rh, Co, Fe particles because they can prevent sintering and deactivation through coking, which otherwise blocks the metal surface as carbon accumulates. This review concludes with the major challenges facing the CO2 methanation by nanoporous materials for fuel applications.

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Section: Introductionmentioning

confidence: 99%

Nanoporous Materials as New Engineered Catalysts for the Synthesis of Green Fuels

Fechete

Védrine

2015

Molecules

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“…It can be observed that Pt-supported catalysts exhibited two H 2 consumption peaks, corresponding to the reduction of Pt oxides (Pt 2+ ) to the metallic state (Pt 0 ). The first reduction peaks at 100–300 °C were attributed to the reduction of large particle size of PtO species located on the external surface which interacted relatively weakly with the support. , The second reduction peaks at 400–580 °C indicated the corresponding PtO species were more difficult to reduce because the highly dispersed PtO (small particle size) interacted strongly with the acidic supports and most possibly located in the internal pore. , The H 2 consumption of the second reduction peaks decreased in the following order: Pt/HY(5.5) > Pt/HY(100) > Pt/ASA, suggesting that the Pt/HY(5.5) had higher well-dispersed Pt (smaller Pt particles) and stronger metal–support interaction than Pt/HY(100) and Pt/ASA, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…51,60 The second reduction peaks at 400−580 °C indicated the corresponding PtO species were more difficult to reduce because the highly dispersed PtO (small particle size) interacted strongly with the acidic supports and most possibly located in the internal pore. 51,61 The H 2 consumption of the second reduction peaks decreased in the following order: Pt/HY(5.5) > Pt/HY(100) > Pt/ASA, suggesting that the Pt/HY(5.5) had higher well-dispersed Pt (smaller Pt particles) and stronger metal−support interaction than Pt/HY(100) and Pt/ASA, respectively.…”

Section: Resultsmentioning

confidence: 99%

Effect of Metal–Acid Balance on Hydroprocessed Renewable Jet Fuel Synthesis from Hydrocracking and Hydroisomerization of Biohydrogenated Diesel over Pt-Supported Catalysts

Hengsawad

Srimingkwanchai

Butnark

et al. 2018

Ind. Eng. Chem. Res.

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The development of Pt-supported catalysts for a selective hydrocracking and hydroisomerization of biohydrogenated diesel (BHD, n-C15–C18) to hydroprocessed renewable jet (HRJ) fuel (C9–C14) was investigated. The different acidic supports (i.e., HY zeolite with SiO2/Al2O3 ratios of 5.5 and 100 and amorphous silica–alumina supports) loaded with 0.5 wt % Pt content were prepared and tested for the catalytic conversion of BHD to HRJ fuel. The Pt supported on HY zeolite with SiO2/Al2O3 ratio of 100 denoted as Pt/HY(100) catalyst exhibited the highest jet fuel yield with high branched isomers due to its good balance between metal and acid function. The effects of the reaction temperature, reaction pressure, and liquid hourly space velocity (LHSV) on the hydrocracking and hydroisomerization performance were studied over Pt/HY(100) catalyst. The jet fuel yield was obtained at maximum value of 33 wt % at 310 °C, 450 psig, LHSV of 1.0 h–1, and H2/BHD molar ratio of 30. A stability test was also conducted over Pt/HY(100) catalyst for 160 h. No significant change in the catalytic activity and selectivity during the test was observed, indicating the high stability of the Pt/HY(100) catalyst.

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“…The spectral band of zeolite CY at 460 cm −1 was assigned to the skeleton insensitive internal of MO 4 tetrahedral bending peak of zeolite Y, where M is either Si or Al (Setiabudi et al, 2013; Tan et al, 2013). The band at 570 cm −1 was assigned to the double ring external linkage of zeolite Y (D'Ippolito et al, 2013). The bands at 685–775 cm −1 and 1,010–1,080 cm −1 were assigned to symmetry stretching and asymmetrical stretching of the inner tetrahedra of zeolite Y, respectively (Azzolina-Jury et al, 2013).…”

Section: Resultsmentioning

confidence: 99%

Citric Acid-Treated Zeolite Y (CY)/Zeolite Beta Composites as Supports for Vacuum Gas Oil Hydrocracking Catalysts: High Yield Production of Highly-Aromatic Heavy Naphtha and Low-BMCI Value Tail Oil

et al. 2019

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Citric acid-treated zeolite Y (CY) and zeolite beta were mechanically mixed to obtain composite zeolites (CY-Beta) with various zeolite beta contents. The composite zeolites were used as the acid components of hydrocracking catalyst supports. The physical and chemical properties of the supports and catalysts were analyzed by N2 adsorption-desorption, XRD, SEM, and NH3-TPD. The mechanical mixing of CY and zeolite beta does not destroy the textual properties of the original zeolites. However, the acidity of the composite zeolite does not fit the linearly calculated value of the two zeolites because some of the acid sites are covered or reacted with other acid sites during the mixing process. In addition, weak acid sites favor the high yield of tail oil with low BMCI value. Compared with the CY-based and beta-based catalysts, the conversion and light oil yield of the CY-Beta-based catalyst was increased. The conversion, light oil yield, and petrochemical yield of the Ni-W/20CY-Beta(20)/ASA catalyst are 78.15, 65.0, and 83.7%, respectively. The BMCI value of the tail oil is 4.7, and the aromatic potential content (APC) of heavy naphtha (boiling point 65–177°C) is 42%. The 1,500 h pilot plant test of Ni-W/20CY-Beta(20)/ASA at 350°C, 7.0 MPa, 2.0 h−1 LHSV, and 800 H2/oil (v/v) shows that the activity remains stable during the 1,500 h evaluation. The heavy naphtha (APC about 41.0) yield of 41.2 illustrates that the catalyst has the ability to aromatize and cyclize the light fractions. The yield of diesel is about 25% with a cetane index (CI) of 59.2; the frozen point is lower than −45°C, and the cold filter plugging point is −35°C, demonstrating the isomerization performance for middle distillations. The yield of tail oil is 14.9% with a BMCI of 4.4, showing the high hydrogenation performance of the catalyst to transform the un-cracked tail oil to saturated hydrocarbon in order to reduce the BMCI value.

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Pt-Mg-Ir/Al2O3 and Pt-Ir/HY zeolite catalysts for SRO of decalin. Influence of Ir content and support acidity

Cited by 21 publications

References 73 publications

Nanoporous Materials as New Engineered Catalysts for the Synthesis of Green Fuels

Nanoporous Materials as New Engineered Catalysts for the Synthesis of Green Fuels

Effect of Metal–Acid Balance on Hydroprocessed Renewable Jet Fuel Synthesis from Hydrocracking and Hydroisomerization of Biohydrogenated Diesel over Pt-Supported Catalysts

Citric Acid-Treated Zeolite Y (CY)/Zeolite Beta Composites as Supports for Vacuum Gas Oil Hydrocracking Catalysts: High Yield Production of Highly-Aromatic Heavy Naphtha and Low-BMCI Value Tail Oil

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