Hydrogen-rich syngas production from steam reforming of palm oil mill effluent (POME) over LaNiO3 & LaCoO3 catalysts
The flourishing development of local oil palm industry inflicts concomitant generation of enormous, highly polluted palm oil mill effluent (POME). The prevalent open ponding treatment was land-intensive, sluggish, and incompetent to degrade POME to below discharge threshold yet being accused for gre...
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| Format: | Thesis |
| Language: | English |
| Published: |
2019
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| Subjects: | |
| Online Access: | http://umpir.ump.edu.my/id/eprint/30021/1/Hydrogen-rich%20syngas%20production%20from%20steam%20reforming%20of%20palm%20oil%20mill.pdf |
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| Summary: | The flourishing development of local oil palm industry inflicts concomitant generation of enormous, highly polluted palm oil mill effluent (POME). The prevalent open ponding treatment was land-intensive, sluggish, and incompetent to degrade POME to below discharge threshold yet being accused for greenhouse gases (CO2 and CH4) emission. This study investigated the potentiality of novel catalytic POME steam reforming over LaNiO3 and LaCoO3 to valorise pollutant-laden POME into valuable H2-rich syngas. The POME feedstock was a brownish (A = ~1.93), acidic (pH of 5), and highly polluted (COD = ~70000 mg/L, BOD5 = ~11000 mg/L, and TSS = ~7700 mg/L) wastewater. POME was composed of 99.73 mol% water and 0.27 mol% organics (mainly carboxylic acids, phenol, and alcohols). Through minimisation of total Gibbs free energy, thermodynamic simulation from 573 – 1173 K confirmed syngas production from POME steam reforming and predicted the likelihood of side reactions. Subsequently, LaNiO3 and LaCoO3 were synthesised using modified citrate sol-gel route. Combination of CO2-TPD and NH3-TPD asserted the net-acidity of LaNiO3 and the net-basicity of LaCoO3. Before POME steam reforming, the catalysts were reduced by H2 to form well dispersed active metal (Ni or Co) on La2O3 support. Specifically, the active metal catalysed the reaction while the La2O3 support suppressed the coking deactivation. For both catalytic POME steam reforming, the optimum syngas yield and degradation efficiencies were determined by tuning temperature ( |
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