Evaluation of feeding molar rate in mini fixed bed reactor for methanol steam reforming with pre-optimized composition of CuO/ZnO/Al2O3 catalyst

IF 0.6 4区 综合性期刊 Q3 MULTIDISCIPLINARY SCIENCES Acta Scientiarum-technology Pub Date : 2023-04-28 DOI:10.4025/actascitechnol.v45i1.60830
Leonardo Silva Prado de Oliveira, R. D. T. Barreto, F. A. Silva, L. M. D. M. Jorge
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Abstract

Hydrogen gas is an ideal fuel due to its higher calorific value among fuels and minimal environmental impact on their energy applications. However, the high cost around high reactivity, explosion risks and extremely low energy density, make it unfeasible to be used as fuel in large quantities scale. There are some possibilities to circumvent these limitations, including obtaining and converting energy through fuel cells, which is very promising. Research in this field has been summarized in recent decades, motivated by the environmental problems faced due to the dependence on non-renewable energy matrices. From this, this study aimed to improve the steam methanol reforming using CuO/ZnO/Al2O3 catalyst. The catalyst was characterized by atomic absorption spectroscopy, N2 physisorption and XRD. Catalytic tests were carried out in a laboratory scale fixed bed reactor at 300°C, atmospheric pressure and in differential conditions (methanol conversion < 10%); a previous run for catalyst synthesis validation in relation to the results obtained in the literature for the same conditions was evaluated. Subsequently, it was found that the thermal degradation of methanol at 300°C without the presence of the catalyst was negligible, and then operational conditions were established to obtain methanol conversions lower than 10%. Then, the initial deactivation of the catalyst over 31h. Also identifying the stability after 7 h in reaction with average conversion into 9.7% of methanol, showing high stability, in addition to good reproducibility on the part of synthesis in optimal composition. Then, experiments were carried out for the molar ratios 2:1 and 4:1 with methanol conversions of 15.5% and 6.6%, respectively. Note that performing the average of the 4:1 and 2:1 methanol conversion in 14.6% obtained at indicating that the upper boundary molar ratios (4:1) compensates for the conversion reduction in 2:1, achieving a result superior to the reference 3:1.
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预优化CuO/ZnO/Al2O3催化剂组合对甲醇蒸汽重整小型固定床反应器进料摩尔速率的影响
氢气是一种理想的燃料,因为它在燃料中具有较高的热值,并且对其能源应用的环境影响最小。然而,由于其高反应性、爆炸危险性和极低的能量密度,使得其成本高,无法作为燃料进行大规模应用。有一些可能性可以绕过这些限制,包括通过燃料电池获得和转换能量,这是非常有前途的。近几十年来,由于依赖不可再生能源矩阵所面临的环境问题,这一领域的研究得到了总结。基于此,本研究旨在改进CuO/ZnO/Al2O3催化剂的蒸汽甲醇重整。采用原子吸收光谱、N2物理吸附和XRD对催化剂进行了表征。在实验室规模的固定床反应器中,在300°C、常压和不同条件下(甲醇转化率< 10%)进行催化试验;先前运行的催化剂合成验证与文献中获得的相同条件下的结果进行了评估。随后,发现在没有催化剂存在的情况下,甲醇在300℃下的热降解可以忽略不计,然后建立了操作条件,以获得低于10%的甲醇转化率。然后,对催化剂进行初始失活31h。同时对反应7 h后的稳定性进行了鉴定,平均转化率为9.7%的甲醇,表现出较高的稳定性,并且在最佳组成下的合成重现性好。然后,在摩尔比为2:1和4:1,甲醇转化率分别为15.5%和6.6%的条件下进行了实验。请注意,在表明上界摩尔比(4:1)补偿2:1的转化减少时,执行4:1和2:1甲醇转化率的平均值为14.6%,获得优于参考3:1的结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Acta Scientiarum-technology
Acta Scientiarum-technology 综合性期刊-综合性期刊
CiteScore
1.40
自引率
12.50%
发文量
60
审稿时长
6-12 weeks
期刊介绍: The journal publishes original articles in all areas of Technology, including: Engineerings, Physics, Chemistry, Mathematics, Statistics, Geosciences and Computation Sciences. To establish the public inscription of knowledge and its preservation; To publish results of research comprising ideas and new scientific suggestions; To publicize worldwide information and knowledge produced by the scientific community; To speech the process of scientific communication in Technology.
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