KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/123456789/1

Browse

Settings

Author: search.filters.author.Eiad-ua, ApiluckSubject: search.filters.subject.Carbon nanotubes

Search Results

Now showing 1 - 2 of 2
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Effect of CoMo metal loading on H2 and CNTs production from biogas by integrative process
    (2022-12-19)
    Aieamsam-Aung, Pichawee
    ;
    Nantapong, Paveenuch
    ;
    Rattanaamonkulchai, Raminda
    ;
    Kludpantanapan, Thunyathon
    ;
    Srifa, Atthapon
    Effect of CoMo metal loading to MgO (1, 5, 30 and 50 wt%) on conversion of biogas by an integrative process was investigated at 900 °C under atmospheric pressure. The integrative process combines the direct methanation of CO<inf>2</inf> in biogas and the CH<inf>4</inf> decomposition to upgrade biogas to CH<inf>4</inf> and decompose to hydrogen and carbon nanotubes. Methane dissociative reaction is governed by the concentration of active metals on the catalyst surface, while DRM reaction is suppressed. The 30 wt%CoMo catalyst shows the optimal loading for production of high-purity H<inf>2</inf> (>90v/v%) and high yield of MWCNTs (2.33 gCNT/gCat-h) with 100%CO<inf>2</inf> conversion and 95%CH<inf>4</inf> conversion. Meanwhile, 1 wt%CoMo catalyst provided the single-walled CNTs with diameter of 2.5 nm, high surface area of 165 m<sup>2</sup>/g and high graphitization of I<inf>G</inf>/I<inf>D</inf> = 6.14.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Simultaneous production of hydrogen and carbon nanotubes from biogas: On the design of combined process
    (2022-04-15)
    Rattanaamonkulchai, Raminda
    ;
    Kludpantanapan, Thunyathon
    ;
    Nantapong, Paveenuch
    ;
    Srifa, Atthapon
    ;
    Koo-Amornpattana, Wanida
    We introduced a novel combined process of CO<inf>2</inf> methanation (METH) and catalytic decomposition of methane (CDM) for simultaneous production of hydrogen (H<inf>2</inf>) and carbon nanotubes (CNTs) from biogas. In this process, biogas is catalytically upgraded into CH<inf>4</inf>-rich gas in METH reactor using Ni/CeO<inf>2</inf> catalyst, and the obtained CH<inf>4</inf>-rich gas is subsequently decomposed into H<inf>2</inf> and CNTs in CDM reactor over CoMo/MgO catalyst. Among the three different process scenarios proposed, the combined process with a steam condenser equipped between METH and CDM reactors could greatly improve a CNTs productivity. The CNTs production yield increased by more than 2.5-fold, maximizing at 9.08 gCNTs/gCat with a CNTs purity of 90%. The deposited carbon product was characterized as multi-walled carbon nanotubes (MWCNTs) with a surface area of 136.0 m<sup>2</sup>/g, comparable with commercial CNTs of 199.8 m<sup>2</sup>/g. The remarkable I<inf>G</inf>/I<inf>D</inf> ratio of 2.18 confirms a superior portion of graphitic carbon in the synthesized CNTs upon the commercial CNTs with I<inf>G</inf>/I<inf>D</inf> = 0.74. Notably, the CH<inf>4</inf> conversion reached 94.5%, while the CO<inf>2</inf> conversion achieved 100%, resulting in the H<inf>2</inf> yield and H<inf>2</inf> purity higher than 90%. This combined process demonstrates a promising route for production of high quality CNTs and high purity H<inf>2</inf> with complete CO<inf>2</inf> conversion using biogas as abundant renewable energy resources. In addition, the test of raw biogas showed no deactivation of catalyst, justifying the implementation of the developed process for real biogas without purification.