Enhancement of methanol steam reforming in a tubular fixed-bed reactor with simultaneous heating inside and outside

Zhang, Huajing; Xu, C.; Yu, Hangyu; Wu, Hao; Jin, Fei; Xiao, Feng; Liao, Zhirong

doi:10.1016/j.energy.2022.124330

Cited by 19 publications

(4 citation statements)

References 41 publications

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“…The Type-3 structure, characterized by a larger surface area and S-shaped curved channels, increases the contact time between reactants and the surface of the bimetallic catalyst, thereby enhancing the conversion rate of methanol and resulting in higher H2 concentration. Compared to simulated results of commercial packed pellet catalysts [11], the radial distribution of H2 in the 3D-printed structured catalyst is more uniform. This is attributed to the interconnected lattice array with uniform pore distribution, facilitating the transport and diffusion of reactants.…”

Section: H2 Concentration Field Distribution Of the Structural Reactorsmentioning

confidence: 67%

Preparation and Simulation of 3D Printed Cu/ZnO Structured Catalysts for On-Board Methanol Steam Reforming

Li,

Zheng,

Zhang

et al. 2024

Preprint

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Currently, the main types of methanol steam reforming (MSR) reactors used in vehicles are fixed bed reactors and microchannel reactors. However, these two-dimensional reactors have limitations such as restricted radial diffusion, catalyst coating peeling off easily, and high pressure drop. In this study, a new type of three-dimensional porous Cu/ZnO catalyst was developed using 3D printing combined with dealloying technology. The internal mass and heat transfer characteristics of the three catalyst structures, Cylindrical microchannel, Diamond, and Gyroid, were revealed using computational fluid dynamics (CFD) simulation. The simulation results showed that the Gyroid structure with its curved and smooth flow channels enhanced radial mass and heat transfer while having the advantage of low pressure drop. Performance tests showed that the Gyroid structure catalyst exhibited high activity and good stability.

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Section: H2 Concentration Field Distribution Of the Structural Reactorsmentioning

confidence: 67%

Preparation and Simulation of 3D Printed Cu/ZnO Structured Catalysts for On-Board Methanol Steam Reforming

Li,

Zheng,

Zhang

et al. 2024

Preprint

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“…Reactions ( 1) and ( 2) are endothermic and reversible, accompanied by an increase in volume, while the exothermic reaction (3) without a change in volume is known as a water gas shift reaction [10]. As a result, a mixture of hydrogen and carbon oxides is formed, the ratio between which depends on the process conditions and the nature of the catalyst.…”

Section: Introductionmentioning

confidence: 99%

Methanol Reforming over Cu-Ce-Al Catalyst Prepared by So-lution Combustion Synthesis Method

Assylbekov,

Xanthopoulou,

Tungatarova

et al. 2024

Preprint

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Demand for environmentally friendly types of energy is growing all over the world, which naturally increases the intensity of work on the production of hydrogen-containing fuel mixtures. Steam reforming of methanol is one of the most effective areas of research, as it is a process with low energy consumption. The results of steam reforming of methanol on the catalysts prepared by solution combustion synthesis (SCS) and impregnation by moisture capacity are presented. Investigation of the activity of Cu-Ce-Al catalysts of different composition was carried out for production of hydrogen and comparison of SCS with traditional impregnation method. Methanol conversion reaches 99%, while the selectivity of H2 was 88%, at 500 °C. It was found that CuAl2O4 spinel formation is due to substitution of Al3+ with Cu2+ Ce3+ cations. A consequence CuAl2O4 and CeAlO3 lattice parameters increase because of difference in ionic radius of Al3+ (0.53 Å) and Cu2+ (0.73 Å), Ce3+ (1.07 Å). Advantages of SCS catalysts in steam reforming of methanol were shown. The aim of this research is to develop a new catalyst for conversion of methanol into hydrogen containing fuel mixtures, which will further promote the organization of a new era of environmentally friendly energy-saving production methods.

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“…Mei et al (2012) investigated the temperature distribution in a microreactor with micro-pin-fin arrays; the enhanced heat transfer unit reduced the non-uniform temperature distribution that caused a non-isothermal reaction in the bed. Zhang et al (2022) designed an internal heating pipe with helical fins in a tubular fixed bed reactor; the reaction temperature was more uniform and the yield increased after the reaction. Chen et al (2020b) demonstrated designs of highly conductive fins for heat transfer enhancement in a multi-tube thermochemical heat storage unit, where the dehydration process of Ca(OH) 2 was considered as the baseline to perform topology optimization.…”

Section: Introductionmentioning

confidence: 99%

Use of copper metal balls as internal heat distributor in fixed-bed pyrolyzer of spent coffee ground for biochar production

2023

ANRES

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Importance of the work: Small copper balls were used as internal heat distributor in a cylindrical pyrolysis bed of spent coffee grounds (SCG) for biochar production. Objectives: To investigate the temperatures of the SCG during pyrolysis, including the biochar properties of the SCG beds with and without copper balls. Materials & Methods: Samples of 300 g of SCG were pyrolyzed at 500°C under a nitrogen atmosphere for 2 hr. Temperature changes and biochar properties around the axes of the beds with and without metal balls and their last positions of decomposition were investigated. Two placements of metal balls (MBs) were considered: as layers in the SCG bed and mixing of the MBs with the same weight throughout the bed. Results: With two layers of 8 mm MBs in the SCG bed, the temperature rate around the bed center during decomposition at 200-450°C was 21.32% greater than without the MBs. This improvement was better than that of 4 mm MBs, which produced a temperature rate increase of 9.64% over the normal bed. Mixing the MBs throughout the bed produced the opposite result, due to the high total heat capacity of the MBs and the SCG bed. The biochar properties from the first case were investigated and compared with those from the normal bed. With the MBs, the product properties were similar to those without MBs, except for the porosity and cation exchange capacity (CEC), which were significantly higher. The biochar was suitable for soil amendment, especially in an acidic soil. Main finding: Placement of 8 mm copper ball layers could be used as an internal heat distributor in the SCG bed. The temperature around the bed axis was closer to that around the heating surface, resulting in a more rapid decomposition rate which produced higher values for porosity, pH and CEC, which are the main parameters for soil amendment.

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Enhancement of methanol steam reforming in a tubular fixed-bed reactor with simultaneous heating inside and outside

Cited by 19 publications

References 41 publications

Preparation and Simulation of 3D Printed Cu/ZnO Structured Catalysts for On-Board Methanol Steam Reforming

Preparation and Simulation of 3D Printed Cu/ZnO Structured Catalysts for On-Board Methanol Steam Reforming

Methanol Reforming over Cu-Ce-Al Catalyst Prepared by So-lution Combustion Synthesis Method

Use of copper metal balls as internal heat distributor in fixed-bed pyrolyzer of spent coffee ground for biochar production

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