LaCoO3 is a promising catalyst for the dry reforming of benzene used as a surrogate of biomass tar.

IF 1.3 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Turkish Journal of Chemistry Pub Date : 2024-06-15 eCollection Date: 2024-01-01 DOI:10.55730/1300-0527.3685
Başar Çağlar, Deniz Üner
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Abstract

Tar build-up is one of the bottlenecks of biomass gasification processes. Dry reforming of tar is an alternative solution if the oxygen chemical potential on the catalyst surface is at a sufficient level. For this purpose, an oxygen-donor perovskite, LaCoO3, was used as a catalyst for the dry reforming of tar. To circumvent the complexity of the tar and its constituents, the benzene molecule was chosen as a model compound. Dry reforming of benzene vapor on the LaCoO3 catalyst was investigated at temperatures of 600, 700, and 800 °C; at CO2/C6H6 ratios of 3, 6, and 12; and at space velocities of 14,000 and 28,000 h-1. The conventional Ni(15 wt.%)/Al2O3 catalyst was also used as a reference material to determine the relative activity of the LaCoO3 catalyst. Different characterization techniques such as X-ray diffraction, N2 adsorption-desorption, temperature-programmed reduction, and oxidation were used to determine the physicochemical characteristics of the catalysts. The findings demonstrated that the LaCoO3 catalyst has higher CO2 conversion, higher H2 and CO yields, and better stability than the Ni(15 wt.%)/γ-Al2O3 catalyst. The improvement in activity was attributed to the strong capacity of LaCoO3 for oxygen exchange. The transfer of lattice oxygen from the surface of the LaCoO3 catalyst facilitates the oxidation of carbon and other surface species and leads to higher conversion and yields.

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LaCoO3 是一种很有前途的催化剂,可用于作为生物质焦油替代物的苯的干转化。
焦油堆积是生物质气化工艺的瓶颈之一。如果催化剂表面的氧化学势达到足够的水平,焦油干重整是一种替代解决方案。为此,我们使用了一种供氧型过氧化物 LaCoO3 作为焦油干重整的催化剂。为避免焦油及其成分的复杂性,选择苯分子作为模型化合物。研究了苯蒸气在 LaCoO3 催化剂上的干重整过程,温度分别为 600、700 和 800 °C,二氧化碳/C6H6 比率分别为 3、6 和 12,空间速度分别为 14,000 和 28,000 h-1。传统的 Ni(15 wt.%)/Al2O3 催化剂也被用作参考材料,以确定 LaCoO3 催化剂的相对活性。为了确定催化剂的物理化学特性,研究人员采用了不同的表征技术,如 X 射线衍射、N2 吸附-解吸、温度编程还原和氧化。研究结果表明,与 Ni(15 wt.%)/γ-Al2O3 催化剂相比,LaCoO3 催化剂具有更高的 CO2 转化率、更高的 H2 和 CO 产率以及更好的稳定性。活性的提高归功于 LaCoO3 强大的氧交换能力。LaCoO3 催化剂表面晶格氧的转移促进了碳和其他表面物质的氧化,从而提高了转化率和产率。
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来源期刊
Turkish Journal of Chemistry
Turkish Journal of Chemistry 化学-工程:化工
CiteScore
2.40
自引率
7.10%
发文量
87
审稿时长
3 months
期刊介绍: The Turkish Journal of Chemistry is a bimonthly multidisciplinary journal published by the Scientific and Technological Research Council of Turkey (TÜBİTAK). The journal is dedicated to dissemination of knowledge in all disciplines of chemistry (organic, inorganic, physical, polymeric, technical, theoretical and analytical chemistry) as well as research at the interface with other sciences especially in chemical engineering where molecular aspects are key to the findings. The journal accepts English-language original manuscripts and contribution is open to researchers of all nationalities. The journal publishes refereed original papers, reviews, letters to editor and issues devoted to special fields. All manuscripts are peer-reviewed and electronic processing ensures accurate reproduction of text and data, plus publication times as short as possible.
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