Hydrogen production via CO2 reforming of CH4 over low-cost Ni/SBA-15 from silica-rich palm oil fuel ash (POFA) waste. (2nd August 2019)

• Record Type: Journal Article
• Authors: Chong, Chi Cheng; Abdullah, Nornasuha; Bukhari, Syahida Nasuha; Ainirazali, Nurul; Teh, Lee Peng; Setiabudi, Herma Dina
• Is Part Of: International journal of hydrogen energy. Volume 44:Number 37(2019)
• Page Start: 20815
• Page End: 20825
• Publication Date: 2019-08-02
• Subjects: Dry reforming -- Hydrogen -- POFA -- Silica/surfactant -- Ni/SBA-15; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2018.06.169
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: H2 was produced via CO2 reforming of CH4 (CRM) using low-cost Ni/SBA-15 synthesized from palm oil fuel ash (POFA) waste as silica precursor. A series of Ni/SBA-15 were synthesized by employing different Na2 SiO3 -POFA/P123 mass ratios (2.0, 2.9 and 4.0) and were compared with Ni/SBA-15 prepared from commercial Na2 SiO3 (Ni/SBA-15(Comm.)). Na2 SiO3 -POFA/P123 = 2.9 was found to be the optimal synthesis ratio, which produces a well-defined hexagonal framework, smaller NiO particles, stronger Ni-support interaction, homogeneous metal distribution and higher amount of basic sites. The catalytic performance complied with the trend of Ni/SBA-15(R4.0) < Ni/SBA-15(R2.0) < Ni/SBA-15(R2.9) ≈ Ni/SBA-15(Comm.), indicating the excellent catalytic activity of Ni/SBA-15(R2.9) (H2 selectivity = 87.6%). The favorable physicochemical properties of Ni/SBA-15(R2.9) ameliorated the active Ni metals stabilization over SBA-15 and boosted the catalyst's virtues towards an outstanding catalytic performance. Hence, it is affirmed that POFA with an optimal Na2 SiO3 -POFA/P123 ratio of 2.9 can be served as silica substitution of Ni/SBA-15 for efficient H2 production via CRM. Graphical abstract: Image 1 Highlights: Palm oil fuel ash (POFA) acts as an alternative sodium silicate (Na2 SiO3 ) for Ni/SBA-15 synthesis. Ni/SBA-15 catalysts were prepared with different Na2 SiO3 -POFA/P123 mass ratios (2.0, 2.9, 4.0). Efficiency towards H2 production followed the order of Na2 SiO3 -POFA/P123 = 2.9 > 2.0 > 4.0. Highest activity of Ni/SBA-15(R2.9) attributed to its favorable physicochemical properties.