Synthesis of Activated Carbon Based Heterogenous Acid Catalyst for Biodiesel Preparation
Applied Catalysis B: Environmental 2015
Kristaps Māliņš, Valdis Kampars, Jānis Brinks, Ilze Māliņa, Raimonds Mūrnieks

The present work illustrates the synthesis of 4-sulfophenyl activated carbon based solid acid catalyst (ACPhSO<inf>3</inf>H), obtained from activated carbon (AC) by arylation with 4-sulfobenzenediazonium chloride. The variation of reaction conditions, such as, reaction temperature (20-85°C) and weight ratio of sulfanilic acid (precursor of 4-sulfobenzenediazonium chloride) to AC (0.14/1-14.00/1) provided ACPhSO<inf>3</inf>H with relatively high density of acid sites. The ACPhSO<inf>3</inf>H with the highest PhSO<inf>3</inf>H density (0.72mmol H<sup>+</sup>/g) was obtained using weight ratio of sulfanilic acid to AC (7.00/1) at 70°C after 10min. The catalyst was characterized by means of nitrogen adsorption analysis (average pore diameter 10.1nm, specific surface area 114m<sup>2</sup>/g, pore volume 0.29cm<sup>3</sup>/g), FT-IR, TG, XRD, FE-SEM and S elemental analysis. The spent catalyst can be easily regenerated recovering its initial density of acid sites. Upon employment in esterification reactions of rapeseed oil fatty acids, ACPhSO<inf>3</inf>H showed similar catalytic performance to Amberlyst-15.

Activated carbon | Arylation | Biodiesel | Esterification | Mesoporous solid acid catalyst

Māliņš, K., Kampars, V., Brinks, J., Neibolte, I., Mūrnieks, R. Synthesis of Activated Carbon Based Heterogenous Acid Catalyst for Biodiesel Preparation. Applied Catalysis B: Environmental, 2015, Vol.176-177, pp.553-558. ISSN 0926-3373. e-ISSN 1873-3883. Available from: doi:10.1016/j.apcatb.2015.04.043

Publication language
English (en)
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