Syngas from palm oil mill effluent (POME) steam reforming over lanthanum cobaltite: Effects of net-basicity

Yoke Wang Cheng, Chi Cheng Chong, Soon Poh Lee, Jun Wei Lim, Ta Yeong Wu, Chin Kui Cheng

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Steam reforming (SR) of palm oil mill effluent (POME) over net-basic LaCoO3 was optimised for syngas production (FSyngas) and degradation efficacies (XP) by tuning temperature (T), POME flow rate (V˙POME), catalyst weight (Wcat), and particle size (dcat). Net-basicity of LaCoO3 facilitated the adsorption of Lewis acid CO2, thereby assisted carbon removal via reverse Boudouard reaction. POME SR over LaCoO3 was promoted by using (i) higher T (endothermicity), (ii) greater V˙POME (larger partial pressure at constant weight-hourly-space-velocity and total feed rate), (iii) larger Wcat (longer residence time for POME vapour), and (iv) smaller dcat (higher surface area to volume ratio). Nevertheless, the catalytic activity of LaCoO3 declined with (i) severe coking and sintering deactivation (T≥973 K), (ii) carbon-encapsulation (V˙POME = 0.10 mL/min), (iii) agglomeration (Wcat>0.3 g), and (iv) pore occlusion (dcat<74 μm). Hence, the optimum conditions of POME SR over LaCoO3 were T = 873 K, V˙POME = 0.09 mL/min, Wcat = 0.3 g, and dcat = 74–105 μm. The optimised process able to produce syngas at a rate of 86.60 μmol/min whilst degrading POME to a less polluted liquid condensate (COD = 435 mg/L and BOD5 = 62 mg/L).

Original languageBritish English
Pages (from-to)349-362
Number of pages14
JournalRenewable Energy
Volume148
DOIs
StatePublished - Apr 2020

Keywords

  • Palm oil mill effluent
  • Steam reforming
  • Syngas generation
  • Wastewater valorisation

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