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Phattaradit Kidamorn. Investigation of Alkali and Alkali earth Oxides doped on Na2WO4-TiO2- MnOxSiO2 catalysts for oxidative coupling of Methane. Master's Degree(Chemical Engineering). Kasetsart University. Office of the University Library. : Kasetsart University, 2018.
Investigation of Alkali and Alkali earth Oxides doped on Na2WO4-TiO2- MnOxSiO2 catalysts for oxidative coupling of Methane
Name: Phattaradit Kidamorn
Classification :.LCCS: TP359.M4
LCSH:
Methane
LCSH:
Catalysts
LCSH:
Metal catalysts
LCSH:
Chemical reactions
LCSH:
Alkalies
LCSH:
Rare earths
Abstract:
The oxidative coupling of methane (OCM) is one of the challenging methods to convert methane (CH4) into value-added chemical compounds (C2+). This work investigated Na2WO4-TiO2-MnOx/SiO2 catalysts doped with oxides of alkali (Li, K, Rb, Cs) or alkali earth (Mg, Ca, Sr, Ba) metals, prepared by incipient wetness impregnation, for OCM reaction. A screening test of the catalysts revealed that the Na2WO4-TiO2-MnOx/SiO2 catalyst doped with Sr (denoted as NWTM-Sr) provided the highest C2+ yield. Characterization of the catalysts using X-ray photoelectron spectrometer disclosed an important information for which the catalysts that possessed a relatively low binding energy of W4f7/2 facilitated a high CH4 conversion. Moreover, catalyst characterizations using X-ray diffraction, Fourier-Transform Infrared spectrometer, and Raman spectroscopy informed that the presence of α-crystobalite phase was a key role in activation of methane. In the catalyst optimization by varying amount of Sr onto NWTM-Sr and the product optimization by vary operating conditions, 0.25 wt% Sr onto NWTM-Sr was found to achieve the highest C2+ yield at 22.88% C2+ yield with 62.5% C2+ selectivity and 36.61% CH4 conversion at 750 °C with an CH4:O2:N2 ratio feed gas ratio of 3:1:4, a total feed flow rate 65 mL/min, and a gas hourly space velocity of 23,600 h-1 . A stability test of the catalyst was also monitored over 24 h, showing that a slow deactivation was observed, mainly due to the sintering of the catalyst.
Kasetsart University. Office of the University Library
Address:
Bangkok
Email:
tdckulib@ku.ac.th
Name: Chalida Niamnuy
Role:
Thesis Advisor
Name: Anusorn Seubsai
Role:
Thesis CO-Advisor
Created:
2018
Modified:
2025-07-17
Issued:
2025-07-17
วิทยานิพนธ์/Thesis
application/pdf
URL: https://www.lib.ku.ac.th/KUthesis/2561/phattaradit-kid-all.pdf
CallNumber:
TP359.M4 .P43
eng
DegreeName: Master of Engineering
Level: Master's Degree
Descipline: Chemical Engineering
Grantor: Kasetsart University
©copyrights Kasetsart University
RightsAccess:
ใช้เวลา
0.034045 วินาที
Phattaradit Kidamorn
| Title | Contributor | Type |
|---|---|---|
| Investigation of Alkali and Alkali earth Oxides doped on Na2WO4-TiO2- MnOxSiO2 catalysts for oxidative coupling of Methane
มหาวิทยาลัยเกษตรศาสตร์ Phattaradit Kidamorn | Chalida Niamnuy | วิทยานิพนธ์/Thesis |
Chalida Niamnuy
Anusorn Seubsai