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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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fe2o3/al2o3氧载体制备方法的研究
, PP. 795-802
Keywords: 化学链燃烧,氧载体,制备方法优选,程序升温还原,溶胶凝胶法,冷冻成粒法
Abstract:
？采用溶胶-凝胶法、共沉淀法、水热合成法、低热固相合成法、机械混合法、燃烧合成法和冷冻成粒法制备铁基氧载体fe2o3/al2o3,并通过物理和化学表征手段来筛选和优化制备方法和制备工艺。对煅烧后的氧载体进行硬度测试,结果表明,溶胶-凝胶法、共沉淀法、机械混合法、燃烧合成法和冷冻成粒法制备的氧载体硬度较高;载体的x射线衍射(xrd)谱图表明,各种制备方法均能制得物相组成为fe2o3/al2o3的氧载体,且随着煅烧温度的提高、煅烧时间的延长,氧载体的结晶度、晶体粒径逐渐增大,煅烧温度1200℃的氧载体的机械性能、晶体结构、晶相组成更稳定。借助化学吸附仪的程序升温还原(tpr)实验表征氧载体的反应活性,并计算氧载体活性度。综合物理和化学表征实验结果表明,最优制备方法为溶胶-凝胶法和冷冻成粒法。
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