Comparative Study on Ni/γ-Al2O3 Prepared via Ultrasonic Irradiation and Impregnation Approaches as an Oxygen Carrier in Chemical Looping Combustion,Industrial & Engineering Chemistry Research

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Comparative Study on Ni/γ-Al2O3 Prepared via Ultrasonic Irradiation and Impregnation Approaches as an Oxygen Carrier in Chemical Looping Combustion
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2021-09-09 , DOI: 10.1021/acs.iecr.1c02485
Nur Adibah Ghazali _{1,

2} , Aqsha Aqsha _{3,

4,

5} , Masaharu Komiyama _{1,

2,

6} , Muhammad Qasim _{1,

2} , Mohd Hizami Mohd Yusoff _{1,

2} , Muhammad Ayoub _{1,

2} , Mariam Ameen _{1,

2} , Mansour Mohammedramadan Tijani ₇

Affiliation

With the recent advancement of the chemical looping combustion (CLC) industry, the development of materials with high stability, high oxidation and reduction rate, and high oxygen transport capacity (OTC) has become a research hotspot. In this paper, the behavior of nickel oxide (NiO) as an oxygen carrier (OC) has been analyzed using thermogravimetric analysis. The influences of the preparation methods and Ni composition have been evaluated to develop Ni-based carriers with high reduction and oxidation rates over 10 redox cycles without changes in the chemical and structural properties. It has been observed that the carriers prepared by the ultrasound irradiation method showed excellent stability and higher reduction and oxidation rate (less than 1–3 min) during multiple redox cycles. However, their OTC values were lower than those of impregnated carriers. It was found that, in the ultrasound irradiation method, the 15NA (15 wt % Ni loading supported with gamma alumina) OC exhibited the highest OTC (3.17%) while 5NA (5 wt % nickel loading supported with gamma alumina) exhibited the lowest OTC (1.34%). A similar trend was observed for the impregnated OC, where 15NA exhibited the highest OTC value (3.67%), whereas 5NA exhibited the lowest OTC value (1.38%). Overall, the carriers prepared via the impregnation method possessed a high value of OTC at approximately 3.67% while the carriers prepared by ultrasound irradiation possessed an OTC value of 3.17%. In terms of physicochemical properties, the carriers prepared using the ultrasound irradiation approach possessed comparatively lower oxidation and reduction temperatures, smaller particle size, higher specific surface area, and more uniform metal distribution on the support. These findings suggested that the Ni-based OC prepared by ultrasound irradiation is a good candidate for CLC reactions.

中文翻译：

超声波辐照浸渍法制备Ni/γ-Al2O3作为化学循环燃烧氧载体的对比研究

随着近年来化学循环燃烧（CLC）行业的发展，开发具有高稳定性、高氧化还原率和高氧传输能力（OTC）的材料成为研究热点。在本文中，使用热重分析法分析了氧化镍 (NiO) 作为氧载体 (OC) 的行为。已经评估了制备方法和 Ni 组成的影响，以开发具有高还原和氧化速率的 Ni 基载体，该载体在 10 次氧化还原循环中具有化学和结构性质不变的情况。已经观察到，通过超声辐照法制备的载体在多次氧化还原循环中表现出优异的稳定性和更高的还原和氧化速率（小于 1-3 分钟）。然而，它们的 OTC 值低于浸渍载体的值。结果发现，在超声辐照方法中，15NA（15wt%Ni负载量，γ氧化铝负载）OC表现出最高的OTC（3.17%），而5NA（5wt%镍负载量，γ氧化铝负载）表现出最低的OTC (1.34%)。对于浸渍的 OC，观察到类似的趋势，其中 15NA 表现出最高的 OTC 值（3.67%），而 5NA 表现出最低的 OTC 值（1.38%）。总体而言，通过浸渍法制备的载体具有较高的 OTC 值，约为 3.67%，而通过超声照射制备的载体具有 3.17% 的 OTC 值。在理化性质方面，使用超声辐照方法制备的载体具有相对较低的氧化和还原温度，更小的粒径、更高的比表面积和更均匀的金属在载体上的分布。这些发现表明，通过超声辐照制备的镍基 OC 是 CLC 反应的良好候选者。

更新日期：2021-09-22

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