Preparation, Coating and Patterning of Cu-Based Catalyst for Methanol Steam Reforming by Micro Fuel Reformer

2005 ◽  
Author(s):  
Taegyu Kim ◽  
Dae Hoon Lee ◽  
Cheonho Yoon ◽  
Dae-Eun Park ◽  
Sejin Kwon ◽  
...  
Keyword(s):  
Steam Reforming ◽  
Conversion Rate ◽  
Sacrificial Layer ◽  
Catalyst Layer ◽  
Precipitation Method ◽  
Poly Vinyl Alcohol ◽  
Methanol Steam Reforming ◽  
Glass Wafer ◽  
Fast Kinetics ◽  
Lift Off

Recent increase in need for a portable power source drives research on micro fuel cell and micro fuel reformer as a key component of micro power generation system. Various concept of reforming system is proposed and has been studied. As an attempt to develop wafer based micro reforming system, preparation, coating, and patterning of Cu-based catalysts for methanol steam reforming for micro fuel reformer are presented. Preliminary step to develop MEMS based micro fuel reformer is carried. As a first step, Cu-based catalysts are prepared by co-precipitation method. The effect of precipitation condition on physical characteristics and catalytic activity of the catalyst such as particle size, conversion rate and quality of coating on substrate are reported. And then coating processes of prepared catalysts on glass and silicon wafer are developed. A uniform and robust catalyst layer is obtained. The amount of coated catalyst on unit area of wafer is measured to be 5∼8 mg/cm2, and the thickness of catalyst layer is about 50μm. By multiple coating processes, catalyst thickness can be controlled and up to 15mg/cm2 is obtained that has good reactivity. After then, patterning of coated catalyst layer is reported. Deposited catalyst layer is patterned by way of lift-off process of PVA (Poly-Vinyl Alcohol), organic sacrificial layer, by heating the substrate instead of etching a sacrificial layer. With the results aforementioned on catalyst preparation, coating, and patterning, a prototype micro catalytic reactor for micro fuel reformer is fabricated with MEMS technology. The fabrication process includes wet anisotropic etching of photosensitive glass wafer, coating/patterning of catalyst and bonding of layers. Next step that is challenging part of development of micro reformer is to find a way to overcome the effect of heat loss that lowers the conversion rate of reforming process and to achieve fast kinetics for reduction of the device scale. We are pursuing further optimization of structural design to improve conversion efficiency and to obtain fast kinetics.

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).

Study on the Cu-Ni/Y2O3-ZrO2 Catalytic Performance in Ethanol Steam Reforming

2012 ◽  
Vol 512-515 ◽  
pp. 2257-2261 ◽  
Author(s):  
Hong Da Wu ◽  
Ying Gui Jia ◽  
Yu Yin ◽  
Lue Zhao
Keyword(s):  
Steam Reforming ◽  
Conversion Rate ◽  
Carbon Deposition ◽  
Catalytic Performance ◽  
Precipitation Method ◽  
Ethanol Conversion ◽  
Ethanol Steam Reforming ◽  
Impregnation Method ◽  
Catalyst Composition ◽  
Ethanol Steam

Y2O3-ZrO2 support was prepared by two-step precipitation method with ammonia and oxalic acid. A series of Cu-Ni/Y2O3-ZrO2 catalysts were prepared by impregnation method. The catalysts were investigated and then characterized by XRD and SEM results. The activity of catalysts in ethanol steam reforming was studied. The effects of the catalyst composition on the ethanol conversion rate were discussed and the catalysts inactivation phenomenon under the temperature ranging from 673K to 723K was then analyzed. The results show that 1Cu9Ni/1Y9Zr catalyst has higher activity in ethanol steam reforming, over which ethanol conversion rate is higher than 98% under the situation of 623K, while the inactivation of catalysts with Cu/Ni>3/7 at 673K~723K was caused by carbon deposition .

scholarly journals The Promoting Effect of Ni on Glycerol Hydrogenolysis to 1,2-Propanediol with In Situ Hydrogen from Methanol Steam Reforming Using a Cu/ZnO/Al2O3 Catalyst

Catalysts ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 412 ◽  
Author(s):  
Yuanqing Liu ◽  
Xiaoming Guo ◽  
Garry Rempel ◽  
Flora Ng
Keyword(s):  
Steam Reforming ◽  
Molecular Hydrogen ◽  
Biodiesel Production ◽  
Precipitation Method ◽  
Methanol Steam Reforming ◽  
Phase Reaction ◽  
Promoting Effect ◽  
High Hydrogen ◽  
Al2o3 Catalyst

Production of green chemicals using a biomass derived feedstock is of current interest. Among the processes, the hydrogenolysis of glycerol to 1,2-propanediol (1,2-PD) using externally supplied molecular hydrogen has been studied quite extensively. The utilization of methanol present in crude glycerol from biodiesel production can avoid the additional cost for molecular hydrogen storage and transportation, as well as reduce the safety risks due to the high hydrogen pressure operation. Recently the hydrogenolysis of glycerol with a Cu/ZnO/Al2O3 catalyst using in situ hydrogen generated from methanol steam reforming in a liquid phase reaction has been reported. This paper focusses on the effect of added Ni on the activity of a Cu/ZnO/Al2O3 catalyst prepared by an oxalate gel-co-precipitation method for the hydrogenolysis of glycerol using methanol as a hydrogen source. It is found that Ni reduces the conversion of glycerol but improves the selectivity to 1,2-PD, while a higher conversion of methanol is observed. The promoting effect of Ni on the selectivity to 1,2-PD is attributed to the slower dehydration of glycerol to acetol coupled with a higher availability of in situ hydrogen produced from methanol steam reforming and the higher hydrogenation activity of Ni towards the intermediate acetol to produce 1,2-PD.

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.

Micromachined Methanol Reformer for Portable PEM Fuel Cells

2008 ◽  
Vol 5 (1) ◽  
Author(s):  
Taegyu Kim ◽  
Dae Hoon Lee ◽  
Dae-Eun Park ◽  
Sejin Kwon
Keyword(s):  
Sacrificial Layer ◽  
Catalyst Layer ◽  
Packed Bed ◽  
Methanol Conversion ◽  
Pem Fuel Cells ◽  
Packed Bed Reactor ◽  
Wafer Surface ◽  
Precipitation Condition ◽  
Coating Procedure ◽  
Lift Off

Fabrication procedures for a micromethanol reformer including catalyst preparation, coating, and patterning on a wafer are described. Cu-based catalyst was prepared by coprecipitation method. The effects of precipitation conditions on the catalytic activity and adhesion of coated catalyst on the substrate were tested to find the optimum precipitation condition. For coating purposes, the prepared catalyst was ground into powder and mixed with binder in the solvent. Simultaneous precipitation of catalyst and binder on the wafer produced catalyst layer that is uniform and rigidly found to the wafer surface. The amount of coated catalyst on the wafer was 5–8mg∕cm2 with a thickness of 30μm. By repetition of coating procedure, catalyst mass up to 15mg∕cm2 was obtained with increased reactivity. Patterned catalyst layer was obtained by novel lift-off process of polyvinyl alcohol sacrificial layer. A micromethanol reformer was fabricated using a typical lithography procedure including catalyst coating and patterning process. Typical methanol conversion was higher than the conventional packed bed reactor.

Application of microemulsion method for development of methanol steam reforming Pd/ZnO catalysts

2016 ◽  
Vol 125 (3) ◽  
pp. 1265-1272 ◽  
Author(s):  
Justyna Pawlonka ◽  
Wojciech Gac ◽  
Magdalena Greluk ◽  
Grzegorz Słowik
Keyword(s):  
Steam Reforming ◽  
Methanol Steam Reforming ◽  
Microemulsion Method

scholarly journals High-yield fabrication of perpendicularly magnetised synthetic antiferromagnetic nanodiscs

Nano Research ◽  
2021 ◽  
Author(s):  
Emma N. Welbourne ◽  
Tarun Vemulkar ◽  
Russell P. Cowburn
Keyword(s):  
Thin Film ◽  
Magnetic Properties ◽  
Sacrificial Layer ◽  
Nanosphere Lithography ◽  
High Yield ◽  
Perpendicular Anisotropy ◽  
Ion Milling ◽  
Lift Off

AbstractSynthetic antiferromagnetic (SAF) particles with perpendicular anisotropy display a number of desirable characteristics for applications in biological and other fluid environments. We present an efficient and effective method for the patterning of ultrathin Ruderman-Kittel-Kasuya-Yoshida coupled, perpendicularly magnetised SAFs using a combination of nanosphere lithography and ion milling. A Ge sacrificial layer is utilised, which provides a clean and simple lift-off process, as well as maintaining the key magnetic properties that are beneficial to target applications. We demonstrate that the method is capable of producing a particularly high yield of well-defined, thin film based nanoparticles.

Sign in / Sign up

Export Citation Format

Share Document