可再生三亚甲苯作为喷气燃料添加剂的生产:碱(TiO2)和酸(Al-MCM-41)催化剂下丙酮自缩合反应动力学

IF 7.2 2区 工程技术 Q1 CHEMISTRY, APPLIED
Adrián García, Pablo Marín, Salvador Ordóñez
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引用次数: 0

摘要

航空燃料添加剂的可持续生产对减少航空工业的温室气体排放起着至关重要的作用。生物质发酵得到的丙酮是生物精炼厂的平台分子之一,可作为新开发的可持续工艺的原料。采用多孔固体催化丙酮自缩合反应制备三聚二甲苯喷气燃料添加剂。在本研究中,由于TiO2和Al-MCM-41具有一定的耐失活能力,因此分别选择了TiO2和Al-MCM-41作为碱性和酸性催化剂。在气相连续固定床反应器中,TiO2空速为7900 mol/kg h, Al-MCM-41空速为5000 mol/kg h。研究了进料浓度(5-20%丙酮和0-5%二甲蜜基氧化物)和温度(200-350℃)的影响。首先,根据产物分布对反应方案进行评价。结果表明,酸性催化剂Al-MCM-41有利于二甲酰基氧化物分解为不需要的异丁烯和乙酸。然后建立了反应方案不同步骤的机理动力学模型,并拟合了每种催化剂的实验结果。这个模型是扩大这一过程的一个有价值的工具。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Production of renewable mesitylene as jet-fuel additive: Reaction kinetics of acetone self-condensation over basic (TiO2) and acid (Al-MCM-41) catalysts

Sustainable production of jet fuel additives plays an essential role to decrease greenhouse gas emissions in the aviation industry. Acetone obtained from biomass fermentation is one of the platform molecules of the bio-refinery that can be used as raw material of newly developed sustainable processes. Mesitylene jet fuel additive can be obtained by acetone self-condensation reaction catalyzed by porous solids. In the present work, TiO2 and Al-MCM-41 have been chosen, respectively, as basic and acid catalysts, because of having some tolerance to deactivation. The reaction was studied in a continuous fixed-bed reactor operated in the gas phase at space velocities of 7900 mol/kg h for TiO2 and 5000 mol/kg h for Al-MCM-41. The influence of feed concentration (5–20% acetone and 0–5% mesityl oxide) and temperature (200–350 °C) was studied. First, the reaction scheme was assessed based on the product distribution. It was found that the acid catalyst Al-MCM-41 favors mesityl oxide decomposition to undesired isobutylene and acetic acid. Then, a mechanistic kinetic model of the different steps of the reaction scheme was developed and fitted the experimental results of each catalyst. This model constitutes a valuable tool for the scale-up of this process.

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来源期刊
Fuel Processing Technology
Fuel Processing Technology 工程技术-工程:化工
CiteScore
13.20
自引率
9.30%
发文量
398
审稿时长
26 days
期刊介绍: Fuel Processing Technology (FPT) deals with the scientific and technological aspects of converting fossil and renewable resources to clean fuels, value-added chemicals, fuel-related advanced carbon materials and by-products. In addition to the traditional non-nuclear fossil fuels, biomass and wastes, papers on the integration of renewables such as solar and wind energy and energy storage into the fuel processing processes, as well as papers on the production and conversion of non-carbon-containing fuels such as hydrogen and ammonia, are also welcome. While chemical conversion is emphasized, papers on advanced physical conversion processes are also considered for publication in FPT. Papers on the fundamental aspects of fuel structure and properties will also be considered.
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