Using Coal Coke for N-Sorption with an Al-based Nitrogen Carrier during Chemical Looping Ammonia Generation,Energy & Fuels

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Using Coal Coke for N-Sorption with an Al-based Nitrogen Carrier during Chemical Looping Ammonia Generation
Energy & Fuels ( IF 5.2 ) Pub Date : 2020-09-29 , DOI: 10.1021/acs.energyfuels.0c02733
Mingqian Feng _{1,

2} , Quan Zhang _{1,

2} , Ye Wu _{1,

2} , Dong Liu _{1,

2}

Affiliation

Chemical looping ammonia generation (CLAG) is thought to be another method for clean utilization of fossil fuels, because fossil fuels can be thoroughly converted into chemical material, CO, and noncarbon fuel, NH₃. Intensive studies have been conducted to increase the N-sorption/desorption performances by modifying the N-carrier with single structured carbons (graphite or carbon-black). However, what the N-sorption performances or kinetics of the N-carrier with the real coal coke (with complex structure) are is still not clear, the determination of which will be a big breakthrough for the chemical looping ammonia generation process with coal. In this paper, the N-sorption performance of Al-based nitrogen carrier (γ-Al₂O₃) mixing with coal coke was investigated in detail. Results showed that the reactivity of different coal cokes increases in the order of anthracite, lignite, and bitumite due to the increase of disordered carbon content. In order to further increase the N-sorption performance of the N-carrier, the bitumite coke was prepared with the different pyrolysis conditions, including different heating rates, atmospheres, and temperatures, and it was found that the bitumite coke prepared under 700 °C with heating rate of 10 °C/min in CO₂ was suitable for N-sorption reaction.

中文翻译：

在化学环化氨生成过程中使用焦炭与铝基氮载体进行N吸附

化学循环氨生成（CLAG）被认为是清洁利用化石燃料的另一种方法，因为化石燃料可以被彻底转化为化学物质CO和非碳燃料NH ₃。通过使用单一结构碳（石墨或炭黑）改性N载体，已进行了深入的研究以提高N的吸附/解吸性能。然而，尚不清楚具有真实煤焦（结构复杂）的N-载体的N吸附性能或动力学，对于煤的化学成环制氨过程的确定将是一个重大突破。在本文中，基于Al的氮载体的N吸附性能（γ-Al系₂ ö ₃）与煤焦炭的混合进行了详细的研究。结果表明，由于无序碳含量的增加，不同煤焦的反应性按无烟煤，褐煤和烟煤的顺序增加。为了进一步提高N载体的N吸附性能，在不同的热解条件下制备了焦炭焦炭，包括不同的升温速率，气氛和温度，发现在700°C的温度下制备了焦炭焦炭。在CO _2中以10°C / min的升温速率进行N吸附反应是合适的。

更新日期：2020-10-16

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