Improvement of coke resistance of Ni/Al2O3 catalyst in CH4/CO2 reforming by ZrO2 addition

บทความในวารสาร

ผู้เขียน/บรรณาธิการ

กลุ่มสาขาการวิจัยเชิงกลยุทธ์

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รายละเอียดสำหรับงานพิมพ์

รายชื่อผู้แต่ง: Therdthianwong S., Siangchin C., Therdthianwong A.

ผู้เผยแพร่: Elsevier

ปีที่เผยแพร่ (ค.ศ.): 2008

วารสาร: Fuel Processing Technology (0378-3820)

Volume number: 89

Issue number: 2

หน้าแรก: 160

หน้าสุดท้าย: 168

จำนวนหน้า: 9

นอก: 0378-3820

eISSN: 1873-7188

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-38449117834&doi=10.1016%2fj.fuproc.2007.09.003&partnerID=40&md5=94781d5c56cfaba31ff0354f4a350d61

ภาษา: English-Great Britain (EN-GB)

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บทคัดย่อ

This work investigates the improvement of Ni/Al2O3 catalyst stability by ZrO2 addition for H2 gas production from CH4/CO2 reforming reactions. The initial effect of Ni addition was followed by the effect of increasing operating temperature to 500-700 ฐC as well as the effect of ZrO2 loading and the promoted catalyst preparation methods by using a feed gas mixture at a CH4:CO2 ratio of 1:1.25. The experimental results showed that a high reaction temperature of 700 ฐC was favored by an endothermic dry reforming reaction. In this reaction the deactivation of Ni/Al2O3 was mainly due to coke deposition. This deactivation was evidently inhibited by ZrO2, as it enhances dissociation of CO2 forming oxygen intermediates near the contact between ZrO2 and nickel where the deposited coke is gasified afterwards. The texture of the catalyst or BET surface area was affected by the catalyst preparation method. The change of the catalyst texture resulted from the formation of ZrO2-Al2O3 composite and the plugging of Al2O3 pore by ZrO2. The 15% Ni/10% ZrO2/Al2O3 co-impregnated catalyst showed a higher BET surface area and catalytic activity than the sequentially impregnated catalyst whereas coke inhibition capability of the promoted catalysts prepared by either method was comparable. Further study on long-term catalyst stability should be made. ฉ 2007 Elsevier B.V. All rights reserved.

คำสำคัญ

CH4/CO2 reforming, Coke formation, Ni/Al2O3, Ni/ZrO2/Al2O3