Abstract
Cellulose is a renewable resource that can be used to develop sorbents for dry flue gas desulphurisation processes. In this study, nanoparticles of hydrated lime (Ca(OH)2) were impregnated onto cellulose nanocrystals (CNCs) using a co-precipitation technique. The Ca(OH)2/CNCs composite was then mixed with diatomite and hydrated. Fourier transform infrared and X-ray diffraction confirmed the presence of CNCs in the synthesised sorbent. BET (Brunauer–Emmett–Teller) surface area demonstrated an increase in the reaction area (58.564 m2/g) compared to the commercial hydrated lime (18.019 m2/g). Response surface methodology was used for optimisation tests and to statistically model the experimental variables, including hydration time, hydration temperature, diatomite to Ca(OH)2 ratio, sulphation temperature, and inlet sulphur concentration. A quadratic model from the analysis of variance (ANOVA) evaluation found diatomite to Ca(OH)2 ratio as the model term with the most considerable influence towards both sulphation and conversion, with the highest outcome achieving 54% sulphation and 42% conversion.
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Data Availability
The data supporting the findings of this study are available on request from the corresponding author. The data are not available due to privacy or ethical restrictions.
Abbreviations
- ANOVA:
-
Analysis of variance
- BET:
-
Brunauer–Emmett–Teller
- Ca(OH)2 :
-
Calcium hydroxide
- Ca(NO3)2 :
-
Calcium nitrate
- CCD:
-
Central composite design
- CHNPS:
-
Calcium hydroxide nanoparticles
- CNC:
-
Cellulose nanocrystals
- FTIR:
-
Fourier transform infrared spectroscopy
- NaOH:
-
Sodium hydroxide
- RSM:
-
Response surface methodology
- SO2 :
-
Sulphur dioxide
- SEM:
-
Scanning electron microscopy
- SiO2 :
-
Silicon dioxide species
- XRF:
-
X-ray fluorescence
- XRD:
-
X-ray diffraction
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This study was funded by the Eskom Power Plant Engineering Institute (ESKOM).
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Conceptualisation was done by RS Makomere; Methodology was done by RS Makomere, H.L Rutto, and L Koech; Formal analysis and investigation were done by RS Makomere; Writing—original draft preparation were done by RS Makomere; Writing—review and editing were done by RS Makomere, H.L Rutto, and L Koech; Funding acquisition was done by H.L Rutto; Resources were done by H.L Rutto and L Koech; and Supervision was done by H.L Rutto and L Koech.
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Makomere, R.S., Rutto, H.L. & Koech, L. The Use of Cellulose Nanocrystals to Support Ca(OH)2 Nanoparticles with Diatomite Incorporation in Sulphur Capture at Low Temperatures: Optimisation and Modelling. Arab J Sci Eng 48, 8871–8885 (2023). https://doi.org/10.1007/s13369-022-07491-0
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DOI: https://doi.org/10.1007/s13369-022-07491-0