Kinetic dependencies and reaction pathways in hydrocarbon and oxyhydrocarbon conversions catalyzed by ceria-based materials

บทความในวารสาร

ผู้เขียน/บรรณาธิการ

กลุ่มสาขาการวิจัยเชิงกลยุทธ์

ไม่พบข้อมูลที่เกี่ยวข้อง

รายละเอียดสำหรับงานพิมพ์

รายชื่อผู้แต่ง: Laosiripojana N., Assabumrungrat S.

ผู้เผยแพร่: Elsevier

ปีที่เผยแพร่ (ค.ศ.): 2008

วารสาร: Applied Catalysis B: Environment and Energy (0926-3373)

Volume number: 82

Issue number: #

หน้าแรก: 103

หน้าสุดท้าย: 113

จำนวนหน้า: 11

นอก: 0926-3373

eISSN: 1873-3883

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-44749087664&doi=10.1016%2fj.apcatb.2008.01.009&partnerID=40&md5=5508484cff6c2273df7c499d78b303f7

ภาษา: English-Great Britain (EN-GB)

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บทคัดย่อ

Hydrocarbons (i.e. CH4, C2H4, C2H6, and C3H8) and oxyhydrocarbon (i.e. CH3OH) conversions with and without co-reactants (H2O and CO2) were studied over ceria-based materials prepared by precipitation and cationic surfactant-assisted methods with/without Zr doping with an aim to understand their influences on material specific surface area, oxygen storage capacity (OSC), hydrocarbon reaction rate, resistance toward carbon deposition, and rigorous kinetic dependencies. High surface area CeO2 and Ce-ZrO2 from the cationic surfactant-assisted method provided a higher degree of oxygen storage capacity (OSC) and reaction rates with greater resistance toward carbon deposition than those from the precipitation method. The reaction rates (mol gcat- 1 s- 1) per degree of OSC (mo lOxygen gcat- 1) were identical for all materials, indicating the linear influence of OSC on the rates. Nevertheless, the kinetic dependencies were unaffected by specific surface area, doping element, degree of OSC and reactions (i.e. H2O reforming, CO2 reforming and cracking). The rates were proportional to hydrocarbon partial pressures with positive fraction reaction orders; independent of co-reactant partial pressures; but inhibited by CO and H2. These kinetic dependencies were explained by a set of redox mechanistic proposal, in which the relevant elementary step is the reaction of intermediate surface hydrocarbon with lattice oxygen (OOx), and that lattice oxygen is efficiently replenished by rapid surface reactions with oxygen source from either CO2, H2O, or even CH3OH. ฉ 2008 Elsevier B.V. All rights reserved.

คำสำคัญ

Ceria, kinetic, Oxygen storage capacity, Redox mechanistic