Hydrogen production from methanol-steam reforming reaction

Name: Chaichan Siriruang

keyword: Hydrogen production

; Cu-Zn/ZrO2 doped Al2O3 catalyst

; CO2 capture

; CO2 solid sorbents

; Free CaO reduction

; Mineral admixture

; Hydrogen as fuel

Abstract: The activities of new Cu-Zn based catalysts over Al2O3 based supports were evaluated in a tubular reactor at the temperature range of 200-300°C and 1 atm in a continuous mode. The physical and chemical properties of catalysts were characterized using XRD, TPR, BET surface area, SEM-EDS and XAS. At 200°C, Cu-Zn over ZrO2 doped Al2O3 prepared by impregnation with an addition of urea can exhibit the hydrogen yield up to 90.3% while the yield of impregnated Cu-Zn over γ-Al2O3 is only 28.2%. The study of support effect indicates that ZrO2 doped Al2O3 support can increase the specific copper surface area and boost the activity of the catalyst. The catalyst development from this study can lead to a novel catalyst for low temperature methanol-steam reforming to prevent the catalyst sintering. Although the hydrogen fuel cell is an alternative energy for the future, the hydrogen applications depend on the availability of low hydrogen production cost and environmental friendliness of hydrogen sources without carbon dioxide emissions in the overall process. In order to claim that a hydrogen fuel cell is a clean energy, the CO2 produced from this reforming process must be captured. Therefore, the development of CO2 capture methods was also investigated in parallel with a hydrogen production. A utilization of fly ash as a solid sorbent material for CO2 capture via surface adsorption and carbonation reaction was evaluated as an economically feasible CO2 reduction technique. The results show that fly ash from a coal-fired power plant can capture CO2 up to 304.7-870.1µmol/g fly ash without any treatment. The CO2 adsorption conditions (temperature, pressure, and moisture) affect CO2 capture capacity of fly ash. The carbonation of CO2 with free CaO in fly ashes was evaluated and the results indicated that the reaction consumed most of free CaO in fly ash. The fly ash after CO2 capture was further used for an application such as a mineral admixture for concrete. Properties such as water requirement, compressive strength, autoclave expansion, and carbonation depth of mortar and paste specimens using fly ash before and after CO2 capture such as water requirement, compressive strength, autoclave expansion, and carbonation depth were tested and compared with material standards. The results show that an expansion of mortar specimens using fly ash after CO2 capture is greatly reduced due to the reduction of free CaO content in the fly ash compared to an expansion of specimens using fresh fly ash. There are no significant differences in the water requirement and compressive strength of specimens using fly ash, before and after CO2 capture. The results from this study can lead to an alternative CO2 capture technique with doubtless utilization of fly ash after CO2 capture as a mineral admixture for concrete

Thammasat University. Thammasat University Library

Address: BANGKOK

Email: preserv@tu.ac.th

Name: Pisanu Toochinda

Role: advisor

Name: Sumittra Charojrochkul

Role: co-advisor

Created: 2015

Modified: 2021-10-25

Issued: 2021-10-25

วิทยานิพนธ์/Thesis

application/pdf

DOI: 10.14457/TU.the.2015.173

eng

DegreeName: Doctor of Philosophy

Level: Doctoral Degree

Descipline: Engineering

Grantor: Thammasat University

©copyrights Thammasat University

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