Devlopment of solid acid catalysts for cellulose acetate production için kapak resmi
Devlopment of solid acid catalysts for cellulose acetate production
Sönmeztürk, Begüm, author.
Fiziksel Tanımlama:
x, 74 leaves: charts;+ 1 computer laser optical disc.
Cellulose acetate (CA) is one of the most commercially important cellulose derivatives with a wide range of applications in various industries. As a green approach, the development of heterogeneous solid acid catalysts for cellulose acetate production is important. The objective of the present thesis is to develop active and stable mesoporous solid acid catalysts for solventless cellulose acetate production with acetic anhydride from microcrystalline cellulose. As catalyst sulfating agents, ammonium sulfate and chlorosulfonic acid (CSA) were applied. Ammonium sulfate ((NH₄)₂SO₄) sulfated catalysts are La incorporated titania-silica (SO4/La-TiO2-SiO2), sulfated titania-silica (SO4/TiO2-SiO2), and sulfated Ti-SBA-15 (SO4/Ti-SBA-15), whereas the CSA/Ti-SBA-15 catalysts were sulfated by chlorosulfonic acid. The effect of Si/Ti mole ratios (6, 10, 20) on the stability of CSA/Ti-SBA-15 catalysts was investigated. Activity and stability of the catalysts were tested in the cellulose acetylation reaction by acetic anhydride at 80 oC with a 10:1 acetic anhydride to cellulose AGU mole ratio. The effect of reaction time (2, 4, 6, and 8 h) and amount of catalyst (0.10, 0.25, and 0.5 g) on the reaction were investigated. Synthesized cellulose acetate samples were analyzed by FT-IR, 1H-NMR, and TGA. CSA/Ti-SBA-15 (10) was found to be the most active and stable catalyst with 2.84 % leaching, 89.6 % conversion, 74.6 % yield, and DS of 2.69. The activity and stability of CSA/Ti-SBA-15 (10) catalyst were further investigated after its treatment with acetone. At the end of the 3rd cycle, A-CSA/Ti-SBA-15 (10) was found as an active and stable catalyst with 58.6% cellulose conversion, 50% CA yield, DS of 2.62, and 1.68% sulfur leaching.
Yazar Ek Girişi:
Tek Biçim Eser Adı:
Thesis (Master)--İzmir Institute of Technology:Chemical Engineering.

İzmir Institute of Technology: Chemical Engineering --Thesis (Master).
Elektronik Erişim:
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Durumu/İade Tarihi
Tez T002499 TP248.C45 S698 2022

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