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RISS 인기검색어
- 검색키워드
- 저자 : Amin Talebian-Kiakalaieh (검색결과 3 건)
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Amin Talebian-Kiakalaieh,Sara Tarighi 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.79 No.-
Glycerol acetalization in the presence of aldehydes/ketals and acid catalysts leads to production of fueladditives,which could improve clean fuel ignition, promote combustion process, and reduce fuel gellingin the engine. In this study, hierarchical faujasite zeolite-supported heteropoly acid catalysts (HR/Y) wereprepared followed by impregnation of 10, 20 and 30 wt% phosphotungstic acid (HPW). The synthesizedcatalysts (HR/Y-Wx) were characterized using XRD, FTIR, FESEM, EDX, TEM, NH3-TPD and N2physisorption analyses. The impregnated hierarchical zeolites along with NaY zeolite were used ascatalysts in crude-glycerol acetalization to produce a fuel additive, 4-hydroxymethyl-2,2-dimethyl-1,3-dioxolane (solketal). The catalysts possessed high thermal stability, large specific surface area, large porediameter (mesoporous structure) and strong acidic sites. The highest solketal yield of 97.85% at 100%crude-glycerol conversion was obtained over the HR/Y-W20 catalyst. Optimization studies revealed thatthe best solketal yield of 97.87% at complete reaction conversion could be achieved at 40 C with 10 wt%catalyst weight and 10/1 MR of AC/Gl in 2 h. The synthesized catalyst even maintained its activity after 30h reaction time due to its mesoporous structure and strong acidity. The impact of real impurities (e.g. water, methanol, and NaCl) on catalyst activity was evaluated and the results revealed that crude-glycerolacetalization over HR/Y-W20 acid catalyst was promising for solketal production with >86% solketal yieldat >97% glycerol conversion in the presence of high concentrations of impurities (15 wt% water, 10 wt%methanol, and 15 wt% NaCl). Results confirmed that the prepared HR/Y-W20 catalyst can be a potentialcandidate for future large scale research and development.
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Amin Talebian-Kiakalaieh,Sara Tarighi 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.88 No.-
Hierarchical zeolites have been recently investigated as catalyst by micro-mesoporous framework toimprove the physical transport of large reactants molecules by eliminating the diffusion limitations. Inthis study, controlled mesoporosity was applied to synthesize two types of hierarchical zeolites by acid/base leaching and surfactant templating followed by steaming. The physico-chemical characteristics ofthe synthesized parent (NaY and ZSM-5) and hierarchical (UHR/Y and HR/ZSM-5) samples wereextensively characterized by XRD, FTIR, TGA, SEM, NH3-TPD, ICP, N2-ads/desorption techniques. The ICPresults revealed that post-synthesis approaches successfully washed off Al and Si atoms from the zeolitesframework and increased the SiO2/Al2O3 ratios from 3.13 to 6.20 and from 65.55 to 86.34 in UHR/Y andHR/ZSM-5 samples, respectively. Also, the BET analysis showed significant increase in the average porediameter (DP) size for UHR/Y (31%) and HR/ZSM-5 (153%) compared to their parent ones. Similarly,mesoporous pore volume (Vmeso) exhibited notable surge of 100% and 700% for UHR/Y and HR/ZSM-5,respectively in comparison with their parent forms. The synthesized parent and hierarchical zeoliteswere used in preparation offluid catalytic cracking (FCC) catalyst. Catalyst performance was examined invacuum gas oil (VGO) cracking through a micro-activity test (MAT) unit. Products of interest includinggasoline, propylene, and total olefins exhibited significant yield increase from 29.80 to 50.87, 3.93 to16.41, and 7.36 to 24.98 wt%, respectively over the FCC-4 catalysts which prepared by hierarchical (UHR/Yand HR/ZSM-5) zeolites. The enhanced catalytic activity can be attributed to the absence of diffusionproblems and more accessibility of the acid sites in the hierarchical zeolite structure.
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Gas phase selective conversion of glycerol to acrolein over supported silicotungstic acid catalyst
Amin Talebian-Kiakalaieh,Nor Aishah Saidina Amin,Zaki Yamani Zakaria 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.34 No.-
Gas phase dehydration of glycerol to acrolein over a series of supported HSiW on ZrO2 and nano-sized g-Al2O3 catalyst has been investigated. The characterization results revealed that impregnation of g-Al2O3nanoparticles increased the specific surface area, pore diameter, and thermal stability of the supportedcatalysts. The highest acrolein selectivity of 88.5% at 97.0% glycerol conversion was achieved over 0.5 g30HZ-20A catalyst in 3 h at glycerol feed concentration of 10 wt%, temperature = 300 ?C andTOF = 136 h 1. The coke deposition has no significant effect on the activity of 30HZ-20A catalyst. Indeed, the catalyst was stable even after 40 h.
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