Production of long-chain olefin and fatty alcohol from biodiesel over copper phyllosilicate based catalysts

Name: Warot Prasanseang

Abstract: This thesis focuses on the production of linear long-chain ⍺-olefins and fatty alcohols from biodiesel over copper phyllosilicate (CuPS) based catalysts. The reactions were carried out in a fixed-bed reactor at 250°c under atmospheric H₂ pressure, using Methyl palmitate (MP) as a feed model. The CuPS catalysts (8-30 wt.% Cu) were prepared by ammonia evaporation-hydrothermal method. The crystal structure, surface area, reducibility, Cu dispersion, Cu particle size and acidity of the catalysts were examined by XRD, BET, H₂ -TPR, TEM, NH₃-TPD and Py-IR. The existence of Cu2+ species (octahedral (Oh)/square planar (Sq)), Cu+ and Cu° upon calcination/reduction was investigated by in situ TR-XANES. The Cu dispersion was related to the Cu+ fraction in CuPS, while Bronsted acid sites (BAS) depends on Cu° particles. The MP conversion to 1-hexadecene proceeds via hydrogenation- dehydration promoted by the synergy of Cu° surface and BAS at the interface. The ⍺-olefin selectivity depends on a balance between Cu+ and Cu loading. 20CuPS possessing 10% Cu+ fraction provides a high conversion at 72% with 45% a-olefin selectivity. ln another approach, Cu+ species and BAS of CuPS were tuned by doping with K+ for selective hydrogenation of methyl palmitate to hexadecanol. The catalysts were prepared by impregnating K+ on reduced and non-reduced CuPS. ln situ TR-XANES and Py-IR suggest that the presence of K+ could stabilize Cu+ species and neutralize BAS. As compared to the non-reduced sample, K+ loading (0.01-0.10 wt%) on the reduced CuPS provide higher Cu+ fraction (10-16%), lower BAS (0.82 to 0.16 μmol/g)and lower Cu dispersion (75 to 52%). A balance between Cu° active surface and Cu+ content provides an optimum hydrogenation activity (up to 80 %). The increased Cu+ species, together with the decreased BAS, does not only enhance the catalyst stability, but also hexadecanol selectivity (from 35 to 60%, at ~50% conversion)

สถาบันเทคโนโลยีพระจอมเกล้าเจ้าคุณทหารลาดกระบัง. สำนักหอสมุดกลาง

Address: กรุงเทพมหานคร

Email: Lifelong@kmitl.ac.th

Name: Tawan Sooknoi

Role: Thesis Advisor

Name: Kittisak Choojun

Role: Thesis Co-Advisor

Email : tawan.so@kmitl.ac.th

Email : kittisak.ch@kmitl.ac.th

Created: 2023

Modified: 2567-11-11

Issued: 2567-11-11

วิทยานิพนธ์/Thesis

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DegreeName: Doctor of philosophy

Level: Doctoral Degree

Descipline: Applied Chemistry

Grantor: King Mongkut's Institute of Technology Ladkrabang

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