Selective heating of Pd/AC catalyst in heterogeneous systems for the microwave-assisted continuous hydrogen evolution from organic hydrides: Temperature distribution in the fixed-bed reactor

Horikoshi, Satoshi; Kamata, Momoko; Sumi, Takuya; Serpone, Nick

doi:10.1016/j.ijhydene.2016.05.139

Cited by 55 publications

(46 citation statements)

References 25 publications

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“…An interesting work related to the influence of microwaves on the temperature profile and evolution in the system was performed by Horikoshi et al with the dehydrogenation of methylcyclohexane (MCH) to produce hydrogen [142]. The dehydrogenation of an organic hybrid fits with the need for hydrogen as a clean energy carrier, so the authors investigated the activity of a Pt/AC catalyst and studied with experimental tests and simulations the differences between the CH process and the MW assisted process.…”

Section: Dehydrogenation Applied To Hydrogen Storagementioning

confidence: 99%

Microwaves and Heterogeneous Catalysis: A Review on Selected Catalytic Processes

et al. 2020

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Since the late 1980s, the scientific community has been attracted to microwave energy as an alternative method of heating, due to the advantages that this technology offers over conventional heating technologies. In fact, differently from these, the microwave heating mechanism is a volumetric process in which heat is generated within the material itself, and, consequently, it can be very rapid and selective. In this way, the microwave-susceptible material can absorb the energy embodied in the microwaves. Application of the microwave heating technique to a chemical process can lead to both a reduction in processing time as well as an increase in the production rate, which is obtained by enhancing the chemical reactions and results in energy saving. The synthesis and sintering of materials by means of microwave radiation has been used for more than 20 years, while, future challenges will be, among others, the development of processes that achieve lower greenhouse gas (e.g., CO 2 ) emissions and discover novel energy-saving catalyzed reactions. A natural choice in such efforts would be the combination of catalysis and microwave radiation. The main aim of this review is to give an overview of microwave applications in the heterogeneous catalysis, including the preparation of catalysts, as well as explore some selected microwave assisted catalytic reactions. The review is divided into three principal topics: (i) introduction to microwave chemistry and microwave materials processing; (ii) description of the loss mechanisms and microwave-specific effects in heterogeneous catalysis; and (iii) applications of microwaves in some selected chemical processes, including the preparation of heterogeneous catalysts.A chemical process is conventionally energized by means of conductive heating with a steam boiler as a typical heat source. Nevertheless, a large variety of other forms of energy can be applied for PI, including ultrasounds (for reactions or crystal nucleation), light (in photocatalytic processes), electric fields (in extraction or for orientation of molecules), or microwaves. The microwave (dielectric) heating of materials has been known for a long time, and microwave ovens have been developed from more than 60 years. The studies by Gedye et al. in 1986 and 1988 [3,4] opened a period of very intensive investigation of the microwave effects on chemical reactions in homogeneous systems. Since then, hundreds of research papers have been published, and research has also expanded toward heterogeneous catalysis and its related chemical processes. This review gives an overview of the application of microwave technology to heterogeneous catalysis, including various chemical processes, as well as to the preparation of catalysts.

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Section: Dehydrogenation Applied To Hydrogen Storagementioning

confidence: 99%

Microwaves and Heterogeneous Catalysis: A Review on Selected Catalytic Processes

et al. 2020

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“…This effect has been clearly shown in heterogeneous systems and this selectivity cannot be accomplished by conventional heating. Moreover, it has been exploited for the selective heating of solvents, catalysts, and even microwave susceptors which allow heating non microwave absorbing mixtures.…”

Section: Thermal Microwave Effectsmentioning

confidence: 99%

A Critical Overview on the Effect of Microwave Irradiation in Organic Synthesis

Díaz‐Ortiz

Prieto

Hoz

2018

The Chemical Record

154

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Despite the great success of Microwave Assisted Organic Synthesis (MAOS) there is still a lack of knowledge about the interaction of the electromagnetic radiation with matter. In consequence, it has been very difficult to rationalize the effect of microwave irradiation in chemistry, to determine the existence of microwave effects (thermal and non-thermal) and to develop predictive models on the characteristics required for a reaction to be improved under microwaves. This has been a handicap to develop new chemistry under microwave irradiation and the origin of many controversies. This personal account collects some new findings in this field and our work on the use of computational chemistry to develop predictive models and to determine parameters related to thermal and non-thermal effects, with clear advantages over experimental methods where separation of these effect is almost impossible.

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“…Although hydrogen is industrially produced by steam reforming, like with methane along with the generation of carbon dioxide [1], the combustion of hydrogen, which does not emit a greenhouse gas, has been proposed as an environmentally friendly energy production method [2][3][4]. Unlike its high energy density per weight, the energy density of hydrogen per unit volume is low; hence, it is necessary to liquefy the hydrogen for storage and transport, which is an energy-intensive process [5]. Therefore, the storage and transport of hydrogen are important problems to be solved.…”

Section: Introductionmentioning

confidence: 99%

Microwave-Mediated Continuous Hydrogen Abstraction Reaction from 2-PrOH Catalyzed by Platinum on Carbon Bead

et al. 2019

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We developed a microwave-mediated continuous hydrogen production method from 2-PrOH using platinum on a spherical carbon-bead catalyst. The catalyst cartridge consisted of helical glass part, and straight glass part (helix−straight cartridge) was newly developed for the effective microwave heating of 2-PrOH in the presence of 5% Pt/CB. The microwave resonance was properly adjusted within 2.4−2.5 GHz using the helix−straight cartridge with the glass resonance-adjuster tube. The reaction was conducted by the irradiation of only 10 W of single-frequency microwaves and the catalyst was used continuously for at least 13 h without any loss of catalyst activity.

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Selective heating of Pd/AC catalyst in heterogeneous systems for the microwave-assisted continuous hydrogen evolution from organic hydrides: Temperature distribution in the fixed-bed reactor

Cited by 55 publications

References 25 publications

Microwaves and Heterogeneous Catalysis: A Review on Selected Catalytic Processes

Microwaves and Heterogeneous Catalysis: A Review on Selected Catalytic Processes

A Critical Overview on the Effect of Microwave Irradiation in Organic Synthesis

Microwave-Mediated Continuous Hydrogen Abstraction Reaction from 2-PrOH Catalyzed by Platinum on Carbon Bead

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