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Frontiers of Chemical Science and Engineering

ISSN 2095-0179

ISSN 2095-0187(Online)

CN 11-5981/TQ

Postal Subscription Code 80-969

2018 Impact Factor: 2.809

Front. Chem. Sci. Eng.    2022, Vol. 16 Issue (8) : 1198-1210    https://doi.org/10.1007/s11705-021-2133-z
RESEARCH ARTICLE
Sulfonic acid-functionalized mesoporous silica catalyst with different morphology for biodiesel production
Vinayak Hegde, Parimal Pandit, Pranita Rananaware, Varsha P. Brahmkhatri()
Centre for Nano and Material Sciences, Jain University, Jain Global Campus, Bengaluru 562112, India
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Abstract

Sulfonic acid functionalized mesoporous silica based solid acid catalysts with different morphology were designed and fabricated. The synthesized materials were characterized by various physicochemical and spectroscopic techniques like scanning electron microscope-energy dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, Brunauer–Emmett–Teller surface area, thermogravimetric analysis and n-butylamine acidity. The shape of catalysts particles plays an important role in its activity. The sulfonic acid functionalized mesoporous silica catalysts of spherical shape and the cube shape were assessed for catalytic activity in biodiesel production. The catalytic biodiesel production reaction over the catalysts were studied by esterification of free fatty acid, oleic acid with methanol. The effect of various reaction parameters such as catalyst concentration, acid/alcohol molar ratio, catalyst amount, reaction temperature and reaction time on catalytic activity were investigated to optimize the conditions for maximum conversion. It was sulfonated cubic shape mesoporous silica which exhibited better activity as compared to the spherical shape silica catalysts. Additionally, the catalyst was regenerated and reused up to three cycles without any significant loss in activity. The present catalysts exhibit superior performance in biodiesel production and it can be used for the several biodiesel feedstock’s that are rich in free fatty acids.

Keywords solid acid catalyst      mesoporous silica      sulfonic acid      biodiesel      esterification      oleic acid     
Corresponding Author(s): Varsha P. Brahmkhatri   
Online First Date: 01 March 2022    Issue Date: 02 August 2022
 Cite this article:   
Vinayak Hegde,Parimal Pandit,Pranita Rananaware, et al. Sulfonic acid-functionalized mesoporous silica catalyst with different morphology for biodiesel production[J]. Front. Chem. Sci. Eng., 2022, 16(8): 1198-1210.
 URL:  
https://academic.hep.com.cn/fcse/EN/10.1007/s11705-021-2133-z
https://academic.hep.com.cn/fcse/EN/Y2022/V16/I8/1198
  Scheme 1 Synthesis of sulfonic acid functionalized mesoporous silica.
Fig.1  SEM images of (a, b, c) SNP and (d, e, f) CNP.
Fig.2  (a) Elemental mapping of SNP, S–SH and S–SOH; (b) elemental mapping of CNP, C–SH and C–SOH.
Material O/% Si/% S/%
SNP 59.00 41.00
S–SH 44.77 51.21 4.02
S–SOH 47.93 50.53 1.54
CNP 58.85 41.18
C–SH 64.55 30.41 5.04
C–SOH 67.43 30.22 2.35
Tab.1  Elemental analysis
Fig.3  (a) FTIR spectra of CTAB–SNP, SNP, S–SH and S–SOH; (b) FTIR spectra of CTAB-CNP, CNP, C–SH and C–SOH.
Fig.4  (a, b) N2 adsorption-desorption isotherms of SNP, S–SH and S–SOH; (c, d) N2 adsorption-desorption isotherms of CNP, C–SH and C–SOH.
Materials Surface area/(m2·g–1) Pore diameter/nm n-Butyl amine acidity/(mmol·g–1)
SNP 1078 6.26 0.21
S–SH 808 5.51
S–SOH 1204 5.78 1.13
CNP 1044 4.00 0.48
C–SH 831 3.78
C–SOH 1464 4.95 1.55
Tab.2  Textural properties and total acidity of materials
Fig.5  SEM images of (a) SNP, (b) S–SH, (c) S–SOH, (d) CNP, (e) C–SH and (f) C–SOH.
Fig.6  TGA and DTA analysis of (a) SNP, S–SH, S–SOH and (b) CNP, C–SH, C–SOH. The data was normalized for comparison.
Fig.7  (a) Effect of mole ratio acid/alcohol (reaction conditions: amount of catalyst 0.1 g; reaction temperature 60 °C; reaction time 4 h). (b) Effect of amount of catalyst (reaction conditions: mole ratio1:40; reaction temperature 60 °C; reaction time 4 h).
Fig.8  (a) Effect of reaction time (reaction conditions: mole ratio of acid to alcohol 1:40; amount of catalyst 75 mg; reaction temperature 60 °C). (b) Effect of reaction temperature (reaction conditions: mole ratio of acid to alcohol 1:40; amount of catalyst 75 mg; reaction time 8 h).
Fig.9  Esterification of OA with methanol and ethanol in optimized conditions (reaction conditions: mole ratio of acid to alcohol 1:40; amount of catalyst 75 mg; temperature 60 °C; reaction time 8 h).
Fig.10  Catalytic activity and characterization of recycled catalyst: (a) catalytic activity of recycled catalysts; (b) FTIR of fresh and recycled catalyst S–SOH-R3 and C–SOH-R3; (c) SEM images of fresh and recycled catalyst S–SOH-R3 and C–SOH-R3.
  Scheme 2 Biodiesel production over sulfonated mesoporous silica (S–SNP, C–SNP).
Material Substrate Amount of catalyst Mole ratio alcohol/acid Reaction time Reaction temperature/°C Conversion/% Ref.
C–SOH OA 75 mg 40:1 8 h 60 92 Present work
S–SOH OA 75 mg 40:1 8 h 60 78 Present work
MIL–101(Cr)–SO3H OA 0.1 g 10 mL methanol, 1 mL
OA
20 min 120 93 [42]
Coal-based solid acid OA 8% Methanol: oleic acid 10:1 4 h 67 97 [43]
ICS–SO3H Palm fatty
acid distillate
2% Methanol:palm fatty acid distillate 10:1 3 h 75 94 [44]
Sulfonated activated
carbon
OA 12% Ethanol:OA 7:1 3 h 85 96 [45]
SO3H@ZrP OA 5% Methanol:oleic acid 9:1 5 h 65 89 [46]
HSiW/SBA-15 OA 0.40 g Methanol:OA 20:1 8 h 60 89.7 [47]
ZS/HMS Citric acid 0.31 Citric acid (0.05?mol), n-butanol (0.2?mol) 2 h 120 93 [48]
Tab.3  Production of biodiesel by esterification using different sulfonic acid-functionalized solid acid catalysts
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