KİRAZ ÇEKİRDEĞİ PİROLİZ KİNETİĞİNİN MODEL İÇERMEYEN VE MODEL BAZLI İNTEGRAL KİNETİK YÖNTEMLER KULLANILARAK İZOTERMAL OLMAYAN TERMOGRAVİMETRİK ANALİZ VERİLERİ ÜZERİNDEN İNCELENMESİ

Bu çalışmanın amacı, kiraz çekirdeklerinin ısıl bozulma davranışını ve kinetiğini incelemektir. Bu nedenle, iki farklı partikül boyutundaki (75-150 ve 150-250 µm) kiraz çekirdekleri beş farklı ısıtma hızında (5, 10, 20, 30 ve 40°C/dk) azot gazı varlığında oda sıcaklığından 800°C'ye kadar izotermal olmayan termogravimetrik analize tabi tutulmuştur. Çalışmalar, piroliz bölgesinde temel olarak nem ve düşük molekül ağırlığında uçucuların uzaklaştırılmasına (1. basamak), hemiselülozun (2. basamak), selülozun (3. basamak) ve ligninin (4. basamak) ısıl bozunmalarına karşılık gelen dört farklı basamağın varlığını ortaya koymuştur. Aktif piroliz basamaklarının (2. ve 3. basamakların) kinetik parametreleri Coats-Redfern ve Kissinger-Akahira-Sunose yöntemleri ile hesaplanmıştır. Coats-Redfern yöntemi daha yüksek değerler vermesine rağmen, her iki yöntemle hesaplanan tüm aktivasyon enerjisi değerlerinin birbirleriyle uyumlu oldukları gözlenmiştir. Ayrıca, artan partikül boyutu ile aktivasyon enerjisi değerlerinde artış gerçekleştiği belirlenmiştir.

Anahtar Kelimeler:

Piroliz, Kinetik, Kiraz çekirdeği, Coats-Redfern yöntemi

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