Microwave effect in the dehydrogenation of tetralin and decalin with a fixed-bed reactor

Suttisawat, Yindee; Sakai, Hideki; Abe, Masahiko; Rangsunvigit, Pramoch; Horikoshi, Satoshi

doi:10.1016/j.ijhydene.2011.10.111

Cited by 53 publications

(36 citation statements)

References 28 publications

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“…This result infers that acid hydrolysis involves an initial interaction of cellulose with the AC-SO 3 H catalyst surface followed by proton attack of the cellulose framework from loss of proton by catalyst (-H + ) to initiate the depolymerization process (see below). Germane to the present study, Suttisawat and coworkers [18] established that the dehydrogenation reaction of decalin to tetralin in the presence of microwave selectively heated Pd/AC catalyst particulates accelerated the adsorption/desorption rates of decalin on the catalyst's surface, a result of differences between the temperature at the catalyst surface and the temperature of the solution. In the present case, the interaction of cellulose with the AC-SO 3 H catalyst surface is also impacted by the selective heating conditions.…”

Section: Other Characteristics Of the Microwave Heating Methods Comparsupporting

confidence: 48%

Is Selective Heating of the Sulfonic Acid Catalyst AC-SO3H by Microwave Radiation Crucial in the Acid Hydrolysis of Cellulose to Glucose in Aqueous Media?

et al. 2017

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Selective heating of microwave-absorbing solid catalysts in a heterogeneous medium may affect a chemical reaction; such selectivity cannot be achieved by conventional oil-bath or steam heating methods. Moreover, microwave methods are often misunderstood with respect to equipment and temperature measurements, so that additional experimentation is necessary. In this regard, the present study intended to clarify the effect of microwave selective heating on acid hydrolytic processes using a sulfonated activated carbon catalyst (AC-SO 3 H). The model reaction chosen was the acid hydrolysis of cellulose carried out in a Pyrex glass microwave reactor, with the process being monitored by examining the quantity of total sugar, reducing sugar, and glucose produced. Heat transfer from the catalyst to the aqueous solution through absorption of microwaves by the catalyst occurred as predicted from a simulation of heat transfer processes. The resulting experimental consequences are compared with those from the more uniform microwave conduction heating method by also performing the reaction in a SiC microwave reactor wherein microwaves are absorbed by SiC. Some inferences of the influence of microwave selective heating of carbon-based catalyst particles are reported. Under selective heating conditions (Pyrex glass reactor), the yield of glucose from the acid hydrolysis of cellulose was 56% upon microwave heating at 200 • C, nearly identical with the yield (55%) when the hydrolytic process was performed under mainly conventional heating conditions in the SiC reactor. Although the beneficial effect of catalyst selective heating was not reflected in the reaction efficiency, there were substantial changes in the state of adsorption of cellulose on the catalyst surface.

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Section: Other Characteristics Of the Microwave Heating Methods Comparsupporting

confidence: 48%

Is Selective Heating of the Sulfonic Acid Catalyst AC-SO3H by Microwave Radiation Crucial in the Acid Hydrolysis of Cellulose to Glucose in Aqueous Media?

et al. 2017

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“…154 As an example, MW effects in heterogeneous catalysis were investigated in the dehydrogenation reaction of decalin and tetralin. 155,156 The use of MW heating proved both to improve the reagent conversion and to lower the deactivation rate of the catalyst. An observed beneficial effect of MW use was the large temperature gradient between the catalyst and surrounding species (direction of heat transfer reversed compared with the thermal mode).…”

Section: Microwave-assisted Reactionsmentioning

confidence: 99%

Homogeneous, Heterogeneous and Nanocatalysis

Albonetti

Mazzoni

Cavani

2014

Transition Metal Catalysis in Aerobic Alcohol Oxidation

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The past decade has seen ever-increasing interest in the catalytic aerobic oxidation of alcohols, which is one of the pivotal functional group transformations in organic chemistry. Nevertheless, most of the current methods for alcohol oxidation are not catalytic, hence the use of catalysts and green oxidants such as O2 or air, instead of stoichiometric quantities of inorganic oxidants, will provide a highly desirable approach to this reaction. This chapter summarizes the latest breakthroughs in the use of homogeneous and heterogeneous catalysts in aerobic alcohol oxidation in the liquid phase; the use of microwaves and photochemistry to assist and promote catalytic activities is also highlighted. Moreover, since nanoparticle systems may be considered an interesting compromise between heterogeneous and homogeneous catalytic systems, the recent development of soluble transition metal colloids as active nanocatalysts for aerobic alcohol oxidation is also presented.

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“…Coke deposited on the catalyst after upgrading reaction is as follows: 21.7% (N 2 gas only), 17.3% (tetralin), 13.4% (decalin) and 14.2% (H 2 gas only). Thermodynamically, the liberation of hydrogen from polycyclic organic compounds such as tetralin and decalin is favored at high temperatures, such as 425 • C [17,31]. In the case of tetralin, the complete dehydrogenation of a mole produces naphthalene and only two moles of hydrogen; hence, the reaction medium could have experienced limited hydrogen supply to adequately quench radical fragments of macromolecular weight hydrocarbons [32,33].…”

Section: Hydrogen Donor Routesmentioning

confidence: 99%

“…This is in agreement with the observation of Abu-Laban et al [18], for a comparative study of deoxygenation of pyrolysis oil using induction heating of pelleted Pt/Al 2 O 3 catalyst mixed with steel balls and conventional heating with heating cable. Unlike conventional heating in which heat flow into the catalyst from the surrounding fluid, for induction heating, the rapid heat up of catalyst and surrounding fluids by the steel balls causes heat to flow outwardly from the catalyst surface, promoting desorption of molecules, and thus deterring the polymerization and condensation reactions responsible for coke formation [18,31]. The reason for this is that the surface of the catalyst is hotter than the surrounding fluid [17].…”

Section: Coke Formationmentioning

confidence: 99%

Tetralin and Decalin H-Donor Effect on Catalytic Upgrading of Heavy Oil Inductively Heated with Steel Balls

et al. 2020

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The Toe-to-Heel Air Injection (THAI) combined with catalytic upgrading process in situ (CAPRI) has demonstrated it can simultaneously extract and upgrade heavy oil in situ. This paper reports the investigation of augmenting temperature deficit and suppressing coke formation in the CAPRI section through the incorporation of induction heating and H-donor solvents. An induction-heated catalytic reactor was designed and developed, heated with steel balls in a mixed bed of NiMo/Al2O3 catalyst (66% v/v) to 425 °C temperature, 15 bar pressure and 0.75 h−1 LHSV (Liquid Hourly Space Velocity). The catalyst surface area, pore volume and pore size distribution were determined by using nitrogen adsorption–desorption, while the location of coke deposits within the microstructure of the pelleted spent catalyst was analyzed with X-ray nano-Computed Tomography (X-ray nano-CT). Findings showed that induction heating improved the catalyst performance, resulting in a 2.2° American Petroleum Institute (API) gravity increase of the upgraded oil over that achieved with the conventional heating method. The increment in API gravity and viscosity reduction in the upgraded oils with nitrogen gas only, N2 and H-donor solvents, and hydrogen gas environments can be summarized as follows: decalin > H2 gas >= tetralin > N2 gas. Meanwhile, the improvement in naphtha fraction, middle distillate fractions and suppression of coke formation are as follows: decalin > H2 gas > tetralin > N2 gas. The X-ray nano-CT of the spent catalyst revealed that the pellet suffers deactivation due to coke deposit at the external surface and pore-mouth blockage, signifying underutilization of the catalyst interior surface area.

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Microwave effect in the dehydrogenation of tetralin and decalin with a fixed-bed reactor

Cited by 53 publications

References 28 publications

Is Selective Heating of the Sulfonic Acid Catalyst AC-SO3H by Microwave Radiation Crucial in the Acid Hydrolysis of Cellulose to Glucose in Aqueous Media?

Is Selective Heating of the Sulfonic Acid Catalyst AC-SO3H by Microwave Radiation Crucial in the Acid Hydrolysis of Cellulose to Glucose in Aqueous Media?

Homogeneous, Heterogeneous and Nanocatalysis

Tetralin and Decalin H-Donor Effect on Catalytic Upgrading of Heavy Oil Inductively Heated with Steel Balls

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