FUEL
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2021
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IF 6.609
Zhige Zhang,Guofeng Zhao,Wenyang Li,Jiawei Zhong,Jun Xie
The efficient conversion of renewable biogas has attracted ever-increasing interest in past decades. Ni-CeO 2 -Al 2 O 3 supported on monolithic SiC-foam (denoted as Ni/CeO 2 -Al 2 O 3 /SCF) is designed and applied in biogas reforming. The monolithic Ni/CeO 2 -Al 2 O 3 /SCF catalysts were deeply characterized by XRD, ICP-AES, SEM, HR-TEM, CO 2 -TPD, etc. The cycle between CeO 2 -Al 2 O 3 and CeAlO 3 was verified by in-situ CH 4 /CO 2 -TPSR, and the catalytic role of CeAlO 3 in coke elimination and CO 2 activation was further confirmed. Due to the uniform distribution of Ni nanoparticles (NP S ) and the activation of CO 2 by CeAlO 3 , Ni/CeAlO 3 -Al 2 O 3 /SCF shows excellent catalytic stability to inhibit sintering and eliminate carbon deposition. At 900 °C and a gas hourly space velocity (GSHV) of 24000 mL g Cat -1 h −1 , excellent CH 4 /CO 2 conversion of 86/99% are initially achieved over Ni/CeAlO 3 -Al 2 O 3 /SCF catalyst, followed by slight decrease after 140 h, and remain basically stable for the next 260 h.
研究领域:
化学工程
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能源科学
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催化材料
✓ 已验证
DOI
高影响因子
ChemCatChem
·
2026
·Vol. 18
·期 6
·e01859
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IF 4.1
Jiahao Qi,Shangmeng Ning,Yuan Liu,Yongdan Li,Cuijuan Zhang
Developing high-performance Ni-based catalysts is critical for the practical application of dry reforming of methane (DRM). Herein, the 10wt%Ni/CeO 2 catalyst was mediated by CeAlO 3 formed by interfacial reaction between impregnated Al species and the CeO 2 support. The resultant CeAlO 3 has a significant influence on the structural properties and the catalytic performance. CeAlO 3 can enhance the dispersion of Ni, introduce more oxygen ion vacancies and medium basic sites, which contribute to the high activity and high coking resistance. Furthermore, the enhanced interaction between Ni and the support impedes the sintering of Ni nanoparticles, leading to improved stability. The sample with Al:Ce molar ratio of 0.1 demonstrates impressive performance, at 800°C and 120,000 mL/(h·g cat ), the CH 4 , CO 2 conversion and H 2 /CO ratio are 94.3%, 90.7%, and 0.92, respectively. The activity decreases by <5% over 200 h test at 750°C with a carbon accumulation rate of only 0.54 mg C/(g cat ·h).
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yang Liu,Jia-Ji Liang,Wei-Ming Guo,Chao Chang,Xiao-Ming Duan,De-Chang Jia,Hua-Tay Lin
High-temperature thermal stability plays a crucial role in the structural application of pressureless liquid-phase sintered SiC (PLS-SiC) ceramics. In this paper, a PLS-SiC ceramic processed with CeO 2 –Al 2 O 3 as sintering additives with excellent high-temperature thermal stability was achieved by incorporating (Hf, Zr, Ta, Nb, Ti)B 2 (HEB) particles. Results showed that PLS-SiC ceramics with HEB-free underwent a structural change from dense to porous microstructure after annealing at 1800 °C/1 h. Conversely, PLS-SiC ceramics with the addition of 10 vol% HEB exhibited excellent thermal stability, as evidenced by the retention of their dense microstructure after exposure to annealing at 1800 °C/1 h. The possible primary reasons for this significantly different response to the thermal stability could be probably attributed to fact that HEB reacted with CeAlO 3 and SiC to form solid-phase products, subsequently inhibiting the formation of gas-phase products after decomposition of CeAlO 3 alone in a high-temperature vacuum environment. In addition, the formation of a compact protective outer layer containing Hf–Ta containing diboride in PLS-SiC ceramics during the annealing process could effectively hinder the volatilization of volatile substances at a high temperature.
研究领域:
材料科学
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陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE IONICS
·
2021
·
IF 3.785
X.Y. Ping,B. Meng,W.K. Liang,Q. Zheng,C. Li
The Ce 0.85 Y 0.15 O 2-δ (YDC)-xmol% aluminum containing compound (x = 0, 10, 20 and 40) composite powders were prepared through mixing YDC with 0, 10, 20 and 40 mol% Al(NO 3 ) 3 (named as A0, A10, A20, A40), and then densified by spark plasma sintering at 1300 °C for 5 min. The main phase of YDC exists in all samples, while a second phase of CeAlO 3 forms for x ≥ 10 in the composite ceramics. The diffraction peak intensity of CeAlO 3 gradually augments with the increase of Al(NO 3 ) 3 addition amount. The average grain size of the composite ceramics reduces from 1.7 μm to 0.34 μm with the rise in Al(NO 3 ) 3 addition amount from 0 to 40%. The grain boundary (GB) electrical conductivity of A10 and A20 is lowered by 96% and 89% compared with that of YDC at 350 °C because the CeAlO 3 phase exists in the form of flakes and fine grains and hinders the oxygen ion conduction across the GB of samples. When CeAlO 3 grains grow up and uniformly distribute in the A40, the GB conductivity of A40 increases by 405% relative to that of pure YDC at 350 °C.
研究领域:
材料科学
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陶瓷
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固态离子学
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能源材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）