Production of hydrogen from methanol steam reforming using CuPd/ZrO2 catalysts – Influence of the catalytic surface on methanol conversion and CO selectivity

2020 ◽  
Author(s):  
Cátia Azenha ◽  
Tiago Lagarteira ◽  
Cecilia Mateos-Pedrero ◽  
Adélio Mendes
Keyword(s):  
Steam Reforming ◽  
Methanol Conversion ◽  
Methanol Steam Reforming ◽  
Catalytic Surface ◽  
Production Of Hydrogen

Temperature and Concentration Simulations in the Methanol Steam Reformer

2008 ◽  
Author(s):  
Yen-Cho Chen ◽  
Rei-Yu Chein ◽  
Li-Chun Chen
Keyword(s):  
Steam Reforming ◽  
Heat Supply ◽  
Methanol Conversion ◽  
Methanol Steam Reforming ◽  
Gas Temperature ◽  
Steam Reformer ◽  
Portable Power ◽  
Supply Channel ◽  
Hydrogen Supply ◽  
Portable Power Applications

The methanol steam reforming plays an important role for hydrogen supply to the proton membrane exchange fuel cell in the portable power applications. The catalyst coating on the walls of channels is often used in the fabrication of the reactors in the reformer to minimize the pressure loss. In this study, the temperature and concentration fields in the reactors for the methanol steam reforming were investigated numerically. The methanol conversion is usually used to evaluate the performance of the reformer. The effects of the inlet gas temperature in the heat supply channel and inlet velocity in the reforming channel on the performance of the methanol steam reforming are presented.

Influence of the component interaction over Cu/ZrO2 catalysts induced with fractionated precipitation method on the catalytic performance for methanol steam reforming

RSC Advances ◽  
2016 ◽  
Vol 6 (36) ◽  
pp. 30176-30183 ◽  
Author(s):  
Jiajia Zhou ◽  
Ye Zhang ◽  
Guisheng Wu ◽  
Dongsen Mao ◽  
Guanzhong Lu
Keyword(s):  
Steam Reforming ◽  
Catalytic Performance ◽  
Precipitation Method ◽  
Methanol Steam Reforming ◽  
Steam Reforming Of Methanol ◽  
Component Interaction ◽  
Production Of Hydrogen ◽  
Composition Ratios

A series of binary Cu/ZrO2 catalysts by choosing different composition ratios and different precipitation sequences have been prepared for the production of hydrogen by steam reforming of methanol (SRM).

Strategic use of CuAlO2 as a sustained release catalyst for production of hydrogen from methanol steam reforming

2018 ◽  
Vol 54 (86) ◽  
pp. 12242-12245 ◽  
Author(s):  
Shaojun Qing ◽  
Xiaoning Hou ◽  
Yajie Liu ◽  
Lindong Li ◽  
Xiang Wang ◽  
...  
Keyword(s):  
Sustained Release ◽  
Steam Reforming ◽  
Catalytic Performance ◽  
Methanol Steam Reforming ◽  
Production Of Hydrogen ◽  
Excellent Catalytic Performance

Using sustained release catalysis, CuAlO2 catalyst demonstrates excellent catalytic performance for methanol steam reforming and can be completely regenerated.

scholarly journals Modeling and Design of a Multi-Tubular Packed-Bed Reactor for Methanol Steam Reforming over a Cu/ZnO/Al2O3 Catalyst

Energies ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 610 ◽  
Author(s):  
Jimin Zhu ◽  
Samuel Simon Araya ◽  
Xiaoti Cui ◽  
Simon Lennart Sahlin ◽  
Søren Knudsen Kær
Keyword(s):  
Steam Reforming ◽  
Packed Bed ◽  
Methanol Conversion ◽  
Operating Conditions ◽  
Packed Bed Reactor ◽  
Inlet Temperature ◽  
Methanol Steam Reforming ◽  
Shell Side ◽  
Co Concentration ◽  
The Impact

Methanol as a hydrogen carrier can be reformed with steam over Cu/ZnO/Al2O3 catalysts. In this paper a comprehensive pseudo-homogenous model of a multi-tubular packed-bed reformer has been developed to investigate the impact of operating conditions and geometric parameters on its performance. A kinetic Langmuir-Hinshelwood model of the methanol steam reforming process was proposed. In addition to the kinetic model, the pressure drop and the mass and heat transfer phenomena along the reactor were taken into account. This model was verified by a dynamic model in the platform of ASPEN. The diffusion effect inside catalyst particles was also estimated and accounted for by the effectiveness factor. The simulation results showed axial temperature profiles in both tube and shell side with different operating conditions. Moreover, the lower flow rate of liquid fuel and higher inlet temperature of thermal air led to a lower concentration of residual methanol, but also a higher concentration of generated CO from the reformer exit. The choices of operating conditions were limited to ensure a tolerable concentration of methanol and CO in H2-rich gas for feeding into a high temperature polymer electrolyte membrane fuel cell (HT-PEMFC) stack. With fixed catalyst load, the increase of tube number and decrease of tube diameter improved the methanol conversion, but also increased the CO concentration in reformed gas. In addition, increasing the number of baffle plates in the shell side increased the methanol conversion and the CO concentration.

Nanosized catalysts for the production of hydrogen by methanol steam reforming

2006 ◽  
Vol 116 (3) ◽  
pp. 354-360 ◽  
Author(s):  
T. Valdés-Solís ◽  
G. Marbán ◽  
A.B. Fuertes
Keyword(s):  
Steam Reforming ◽  
Methanol Steam Reforming ◽  
Nanosized Catalysts ◽  
Production Of Hydrogen

scholarly journals Evaporation of Methanol Solution for a Methanol Steam Reforming System

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4862
Author(s):  
Ngoc Van Trinh ◽  
Younghyeon Kim ◽  
Hongjip Kim ◽  
Sangseok Yu
Keyword(s):  
Cylindrical Shell ◽  
Steam Reforming ◽  
Heat Exchangers ◽  
Methanol Conversion ◽  
Methanol Solution ◽  
Methanol Steam Reforming ◽  
Field Mode ◽  
Methanol Reforming ◽  
Shell And Tube ◽  
Fundamental Requirement

In a methanol-reforming system, because the mixture of methanol and water must be evaporated before reaching the reforming reaction zone, having an appropriate evaporator design is a fundamental requirement for completing the reforming reaction. This study investigates the effect of the evaporator design for the stable reforming of methanol–water mixtures. Four types of evaporator are compared at the same heat duty of the methanol-reforming system. The four evaporators are planar heat exchangers containing a microchannel structure, cylindrical shell-and-tube evaporators, zirconia balls for internal evaporation, and combinations of cylindrical shell-tubes and zirconia balls. The results show that the evaporator configuration is critical in performing stable reform reactions, especially for the flow-field mode of the evaporator. Additionally, the combination of both internal and external evaporation methods generates the highest performance for the methanol-reforming system, with the methanol conversion reaching almost 98%.

Parameter Study of Steam Methanol Reforming With Cu/ZnO/Al2O3 Catalyst in a Microchannel Reactor

2009 ◽  
Author(s):  
Chun-I Lee ◽  
Huan-Ruei Shiu ◽  
Wen-Chen Chang ◽  
Fang-Hei Tsau
Keyword(s):  
Wall Temperature ◽  
Steam Reforming ◽  
Catalyst Layer ◽  
Methanol Conversion ◽  
Channel Length ◽  
Methanol Steam Reforming ◽  
Distribution Analysis ◽  
Methanol Reforming ◽  
Conversion Rates ◽  
Al2o3 Catalyst

Three-dimensional numerical simulations were performed to investigate the effect of methanol conversion and hydrogen product of a microchannel methanol steam reformer under various parameter conditions. In this simulation, the wall temperature of reactor (Tw), inlet flow rate of reactant, the different S/C ratios (steam to carbon ratio) and the thickness of the catalyst layer were taken into account to analyze product concentration and conversion rates along the channel length. The methanol conversion for methanol steam reforming on Cu/ZnO/Al2O3 catalyst was carried out at reaction temperature ranging from 200 to 260° under an atmospheric pressure. Furthermore, the reaction schemes considered the methanol steam reforming reaction and the reverse water gas-shift reaction. Regarding the distribution analysis of methanol reforming, the methanol conversion (η) and the product of hydrogen increase with the increase in wall temperature from 200 to 260°C and lower reactant flow rates. However, the result shows the methanol conversion increases and the hydrogen product decreases with less feed-in amount of methanol as the higher S/C. Additionally, the methanol conversion increase with higher thickness of catalyst layer from 10 to 70μm. The product of hydrogen, therefore, reaches a consistent distribution above 40μm along the channel length. Nevertheless, all of the operation parameter of exhaust stream at the reformer exit has the following composition: 75% H2, 24% CO2 and less than 1% CO. This research attempts to reveal a simplified methanol reforming model, which analyze the significant behavior and product distribution in qualitative/quantitative along the channel.

Simulation of Methanol Steam Reforming Heated by Waste Heat for Hydrogen Production in a Microreactor

2011 ◽  
Vol 216 ◽  
pp. 718-722
Author(s):  
Feng Wang ◽  
Jing Zhou ◽  
Guo Qiang Wang ◽  
Xin Jing Zhou
Keyword(s):  
Steam Reforming ◽  
Reaction Rate ◽  
Surface Reaction ◽  
Waste Heat ◽  
Catalyst Loading ◽  
Methanol Steam Reforming ◽  
Rate Model ◽  
Reactor Outlet ◽  
Catalytic Surface ◽  
Design And Optimization

In order to intensify the process of methanol steam reforming and improving the heating supply process by waste heat, the effect of evenly and interrupted distributed catalytic surface was studied on H2 content at reactor outlet. With the application of general finite reaction rate model in CFD software of FLUENT, we carried out 3-D simulation of this process. Results show that, outlet H2 content can be increased through interrupted distributed catalytic surface with the same catalyst loading. This result can be used to provide the basis for surface reaction design and optimization in microreactor.

Production of Hydrogen With Low Carbon Monoxide Formation Via Catalytic Steam Reforming of Methanol

2006 ◽  
Vol 3 (4) ◽  
pp. 369-374 ◽  
Author(s):  
Sanjay Patel ◽  
K. K. Pant
Keyword(s):  
Carbon Monoxide ◽  
Steam Reforming ◽  
Contact Time ◽  
Methanol Conversion ◽  
Operating Conditions ◽  
Molar Ratio ◽  
Optimum Operating ◽  
Steam Reforming Of Methanol ◽  
Production Of Hydrogen ◽  
Carbon Monoxide Formation

The production of hydrogen was investigated in a fixed bed tubular reactor via steam reforming of methanol (SRM) using CuO∕ZnO∕Al2O3 catalysts prepared by wet impregnation method and characterized by measuring surface area, pore volume, x-ray diffraction patterns, and scanning electron microscopy photographs. The SRM was carried out at atmospheric pressure, temperature 493-573K, steam to methanol molar ratio 1–1.8 and contact-time (W/F) 3–15kg cat./(mol/s of methanol). Effects of reaction temperature, contact-time, steam to methanol molar ratio and zinc content of the catalyst on methanol conversion, selectivity, and product yields was evaluated. The addition of zinc enhanced the methanol conversion and hydrogen production. The excess steam promoted the methanol conversion and suppressed the carbon monoxide formation. Different strategies have been mentioned to minimize the carbon monoxide formation for the steam reforming of methanol to produce polymer electrolyte membrane (PEM) fuel cell grade hydrogen. Optimum operating conditions with appropriate composition of catalyst has been investigated to produce more selective hydrogen with minimum carbon monoxide. The experimental results were fitted well with the kinetic model available in literature.

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