Catalytic Cracking of Methylcyclohexane on FAU, MFI, and Bimodal Porous Materials: Influence of Acid Properties and Pore Topology

Borm, Rhona Van; Reyniers, Marie-Françoise; Martens, Johan A.; Marin, Guy

doi:10.1021/ie100429u

Cited by 21 publications

(9 citation statements)

References 60 publications

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“…Levulinic acid, γ-valerolactone, 2-methyltetrahydrofuran and 2-butanol were obtained by Sigma Aldrich (St. Louis, MO, USA) and used as received. Zeolite HY (CBV 500) was purchased from Zeolyst International (Valley Forge, PA, USA) (ratio SiO 2 /Al 2 O 3 mol/mol: 5.2; acidity: 1.5 mmol/g measured by NH 3 -TPD) [70] and it was treated at 510 • C for 2 h before its use. Instead, niobium phosphate (acidity: 0.33 mmol/g measured by an acid-base titration in water using 2-phenyl-ethylamine as the basic probe) [24] was kindly provided from CBMM Companhia Brasileira de Metalurgia e Mineracão (Araxá, Minas Gerais, Brasil), and treated at 255 • C for 6 h, under high vacuum (5 Pa) before its use [7].…”

Section: Methodsmentioning

confidence: 99%

Cascade Strategy for the Tunable Catalytic Valorization of Levulinic Acid and γ-Valerolactone to 2-Methyltetrahydrofuran and Alcohols

et al. 2018

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A cascade strategy for the catalytic valorization of aqueous solutions of levulinic acid as well as of γ-valerolactone to 2-methyltetrahydrofuran or to monoalcohols, 2-butanol and 2-pentanol, has been studied and optimized. Only commercial catalytic systems have been employed, adopting sustainable reaction conditions. For the first time, the combined use of ruthenium and rhenium catalysts supported on carbon, with niobium phosphate as acid co-catalyst, has been claimed for the hydrogenation of γ-valerolactone and levulinic acid, addressing the selectivity to 2-methyltetrahydrofuran. On the other hand, the use of zeolite HY with commercial Ru/C catalyst favors the selective production of 2-butanol, starting again from γ-valerolactone and levulinic acid, with selectivities up to 80 and 70 mol %, respectively. Both levulinic acid and γ-valerolactone hydrogenation reactions have been optimized, investigating the effect of the main reaction parameters, to properly tune the catalytic performances towards the desired products. The proper choice of both the catalytic system and the reaction conditions can smartly switch the process towards the selective production of 2-methyltetrahydrofuran or monoalcohols. The catalytic system [Ru/C + zeolite HY] at 200 • C and 3 MPa H 2 is able to completely convert both γ-valerolactone and levulinic acid, with overall yields to monoalcohols of 100 mol % and 88.8 mol %, respectively.

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Section: Methodsmentioning

confidence: 99%

Cascade Strategy for the Tunable Catalytic Valorization of Levulinic Acid and γ-Valerolactone to 2-Methyltetrahydrofuran and Alcohols

et al. 2018

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“…In previous studies, it was found that the product selectivity and conversion of MCH cracking are unique and independent of the acid properties of the zeolite within one framework type [16]. Lots of works focus on the MCH cracking over beta zeolite, but the studies have been limited to low and intermediate temperature (≤650°C), low pressure, and very small flow rate [10][11][12][13][14]. As the flight speed increases, the fuel temperature rises, and the fuel can transform to the vapor phase when exceeding its bubble point.…”

Section: Introductionmentioning

confidence: 97%

“…Many types of zeolites have been investigated in cracking of MCH, such as Hydro-Zeolite Socony Mobile-5 (HZSM-5), Molecular sieves type Hydro-Y (HY), Hydro-Beta zeolite (HBEA), and HydroMesoporous Crystalline Material-22 zeolite (HMCM-22) [10][11][12][13][14]. Beta zeolite has attracted strong interest in this reaction, due to its three-dimensional structure of 12-membered ring channels and large pore size (main channel system with a diameter of 6.6 × 7.7 Å), which allows easier diffusion of the reactants than in small-pore zeolites [15].…”

Section: Introductionmentioning

confidence: 99%

Heat-Sink Enhancement of Supercritical Methylcyclohexane Cracking over Lanthanum-Modified Beta Zeolite

Liu

Zhu²,

Qin³

et al. 2016

Journal of Propulsion and Power

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A series of lanthanum/beta-zeolite catalysts was prepared via hydrothermal ion exchange, and characterized by inductively coupled plasma-atomic emission spectroscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, and ammonia temperature-programmed desorption. The lanthanum-doping effect on beta-zeolite catalysts was investigated through catalytic cracking of supercritical methylcyclohexane under the system pressure of 4.0 MPa and the mass flow rate of 1.0 g=s. For lanthanum/beta catalyst of the Cat-2 type, the gas yield of 28.3% and heat sink of 3.35 MJ · kg −1 could be achieved at the temperature of 700°C, much higher than those for the pure beta zeolite without lanthanum modification and for the thermal pyrolysis. Correspondingly, Cat-2 has a better performance on coking inhibition with the reduction of 56.2 and 29.5% at 700°C compared to beta zeolite and thermal cracking. Therefore, it was indicated that beta zeolite with the suitable lanthanum content, still maintaining its high activity and stability of the zeolite framework at high temperature due to lanthanum doping, had a great contribution to high heat sink and coking inhibition at high temperature. Nomenclature c = mass fraction of methylcyclohexane in the residues G = mass flow rate, g∕s I = current, A I 550 = intensity of the peak at 2θ 22.6 deg after calcination at 550°C for 3 h I 850 = intensity of the peak at 2θ 22.6 deg after calcination at 850°C for 30 min m 0 = initial feeding mass of methylcyclohexane, kg m 1 = mass of residues collected after a cracking reaction, kg P C = critical pressure, MPa Q m = heat sink, MJ∕kg R crystal = relative crystallinity T C = critical temperature,°C U = voltage, V W = heating power, W α MCH = conversion of methylcyclohexane, wt. % γ gas = gas yield of methylcyclohexane, % η = thermal efficiency

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“…In our recent research, it was found that the amount of Lewis acid site of γ-Al 2 O 3 could be reduced using a mild inorganic acid (boric acid) as a modifier [3]. Additionally, the importance of acid sites in zeolite catalyzed conversion and the seeming simplicity of the reaction using alkanes/alkenes as reactants have led to a wide range of fundamental and applied studies to tailor the surface acidity and understand its effects on catalytic reactions [4,6,[23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

High performance of H3BO3 modified USY and equilibrium catalyst with tailored acid sites in catalytic cracking

Feng

Yan

et al. 2017

Microporous and Mesoporous Materials

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Increasing the cracking ability of catalyst by adjusting its surface acid property is of great significance for oil refining industry. The effects of boric acid on the structure and surface acidity of ultra stabilized Y (USY) and FCC equilibrium catalyst during the modification were investigated. The structural and surface properties of the prepared samples were characterized by low-temperature N 2 sorption, XRD, 27 Al and 29 Si MAS NMR, and FTIR using pyridine probe molecule. Modified USY and equilibrium catalyst possessed reduced Lewis acid sites. The Brönsted/Lewis acid ratios of USY increased from 0.64 to 1.56 after modification, at the same time, the microporous surface areas increased, due to the nonframework and framework dealumination during the modification. The catalytic cracking tests were performed on a bench-scale micro reactor at 500°C and atmospheric pressure, using n-dodecane as a modeling reactant and vacuum gas oil as conventional feedstock. The results showed that

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Catalytic Cracking of Methylcyclohexane on FAU, MFI, and Bimodal Porous Materials: Influence of Acid Properties and Pore Topology

Cited by 21 publications

References 60 publications

Cascade Strategy for the Tunable Catalytic Valorization of Levulinic Acid and γ-Valerolactone to 2-Methyltetrahydrofuran and Alcohols

Cascade Strategy for the Tunable Catalytic Valorization of Levulinic Acid and γ-Valerolactone to 2-Methyltetrahydrofuran and Alcohols

Heat-Sink Enhancement of Supercritical Methylcyclohexane Cracking over Lanthanum-Modified Beta Zeolite

High performance of H3BO3 modified USY and equilibrium catalyst with tailored acid sites in catalytic cracking

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