CO2-cofeeding catalytic pyrolysis of macadamia nutshell. Issue 37 (April 2020)

• Record Type: Journal Article
• Authors: Jung, Sungyup; Kwon, Dohee; Tsang, Yiu Fai; Park, Young-Kwon; Kwon, Eilhann E.
• Is Part Of: Journal of CO₂ utilization. Issue 37(2020)
• Page Start: 97
• Page End: 105
• Publication Date: 2020-04
• Subjects: Waste-to-energy -- Catalytic pyrolysis -- Macadamia nutshell -- Syngas -- Carbon dioxide; Carbon dioxide -- Periodicals; Carbon dioxide -- Environmental aspects -- Periodicals; Carbon dioxide mitigation -- Periodicals; Carbon dioxide; Carbon dioxide -- Environmental aspects; Carbon dioxide mitigation; Periodicals; 628.53205
• DOI: 10.1016/j.jcou.2019.12.001
• Languages: English
• ISSNs: 2212-9820

Abstract

Highlights: Constructing waste to energy platform was achieved by macadamia nutshell pyrolysis. For a sustainable energy production, CO2 was utilized as a reactive gas medium. Two stage CO2 -cofeeding pyrolysis expedited syngas (H2 and CO) formation. Thermal cracking of VOCs via catalytic pyrolysis enhanced syngas formation. Abstract: Here in this study, we laid great stress on a development of sustainable waste-to-energy (WtE) platform via CO2 -cofeeding catalytic pyrolysis of macadamia nutshell (MNS) at mild temperature region. To this end, one-stage and two-stage (non-catalytic/catalytic) pyrolysis of MNS was performed to establish the fundamental relationship of temperature effect on syngas formation. The formation of gaseous pyrolysates was substantially enhanced when two-stage pyrolysis of MNS was applied, and second heating zone isothermally ran at 700 °C. Such the enhanced generation of gaseous pyrolysates from two-stage MNS pyrolysis of MNS was likely due to temperature-driven cracking of volatile organic compounds (VOCs). Also, catalytic two-stage pyrolysis of MNS was performed at lower isothermal running temperature (500 °C) over Ni/SiO2 and Co/SiO2 . The enhanced formation of syngas (H2 and CO) was observed from catalytic pyrolysis of MNS. Therefore, pyrolysis of MNS over Ni/SiO2 or Co/SiO2 could be a reliable platform for enhancing syngas formation at mild temperature (≤ 500 °C) under CO2 environment. In addition, all experimental findings suggested that the use of CO2 is beneficial in the WtE platform, and the use of CO2 could be a practical climate change mitigation measure.