Fine-tuning the catalytic cracking-assisted synthesis of plastic-derived MWCNTs-supported metal oxides for methanol electrooxidation

Nanocrystalline BEA-CNT Composites with High Metal Dispersion Obtained via Inter-Zeolite Transformation for Antibacterial Application

“…In addition, the obtained I D / I G ratio is in the range of 0.5–0.7 for all samples, confirming the high CNT quality (Table S2). − From the above-mentioned observations, it is therefore reasonable to conclude that the CNTs-Fe-FAU composites were successfully synthesized via the combination of catalytic bioethanol dehydration to ethylene over H-ZSM-5 nanosheets and the CCVD process over Fe-FAU catalysts using the previously produced ethylene as a carbon precursor for the growth of CNTs in which the 30 min of deposition time provided the best CNT quality under this circumstance.…”

Structure-oriented conversions of plastics to carbon nanomaterials

“…Additionally, catalysts such as activated carbon, carbon black, and biomass can promote gaseous yields for filament formation. Gong et al 2013a , Gong et al 2012b ; Liu et al 2011 ; Thivasasith et al 2022 ; Wen et al 2014 ; Xu et al 2021a , Xu et al 2021b , Xu et al 2020 ; Yang et al 2020 , Yang et al 2016 ; Yao et al 2021b , Yao et al 2018a Ratio The content of light hydrocarbons and aromatics will increase along with the higher ratio of catalysts to plastics. Acomb et al 2015 ; Elbaba and Williams 2012 ; Gong et al 2013a Temperature Increasing temperature can promote plastics pyrolysis and the generation of gaseous products, then enhancing carbon yields.…”

“…Many compounds have been used as supporting materials, including CaO, SiO 2 , zeolite, CuBr, Al 2 O 3 , MgO, TiO 2 , cordierite, montmorillonite, citric acid, activated carbon, and char. Gong et al 2015b , Gong et al 2012b ; Modekwe et al 2021 ; Ribeiro et al 2022 ; Song et al 2007 ; Thivasasith et al 2022 ; Veksha et al 2022 ; Wang et al 2020 ; Wu and Williams 2009 ; Xu et al 2021a ; Yang et al 2020 , Yang et al 2015 ; Yao et al 2021b , Yao et al 2018a , Yao et al 2018b , Yao et al 2017 ; Zhang et al 2022 Synthesis methods Two-stage Two-stage (pyrolysis and catalysis) method consists of two independent reactors which can be separately heated and controlled. It is the most frequently used approach to fabricate high-quality CNTs from plastics, and is suitable for continuous fabrication, but the carbon yield is usually below 20%.…”

Transformation of CO2 to Carbon Nanotubes by Catalytic Chemical Vapor Deposition using a Metal‐Supported Hierarchical Zeolite Template

“…The resulting CNT exhibited a uniform structure and small diameter of 12.4 nm, and achieved a high yield of up to 96 %. [11] Conventional zeolites are suitable as solid support materials for dispersing catalytic transition metals and controlling the diameter size of carbon nanotubes (CNT). However, there are still limitations due to their small pore size and narrow channel apertures.…”

“…Consequently, this leads to a reduced carbon yield in CNT synthesis and negatively impacts the quality of the resulting CNT. [11] Hierarchical zeolites, which possess two or more levels of porous structures such as micro-mesoporous networks and micro-macroporous networks, have been developed to address the aforementioned issues. [12] These modified zeolites exhibit increased surface areas and improve catalytic efficiency, making them promising for various catalytic applications, including aromatization, dehydration of alcohols, and catalytic cracking.…”