A novel high-efficiency In-based catalyst for ethylbenzene dehydrogenation with CO2

IF 2.5 4区 材料科学 Q2 CHEMISTRY, APPLIED Journal of Porous Materials Pub Date : 2024-05-21 DOI:10.1007/s10934-024-01633-5
Quanhua Wang, Ruiqi Wei, Meng Pan, Yanchao Liu, Lichen Zhang, Jiajun Zheng, Shuwei Chen, Yuhao Zong, Hu Wang, Kaifei Yin, Yanwei Yue, Jinke Li
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Abstract

A series of binary In2O3/S (S = Al2O3, SiO2, and MgO) catalysts were fabricated by an incipient-wetness impregnation method, which were firstly applied in the ethylbenzene dehydrogenation under the presence of CO2 (EBDH-CO2). The synthesized catalysts were systematically characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N2 adsorption–desorption isotherm, temperature-programmed desorption of NH3 and CO2 (NH3/CO2-TPD), temperature-programmed reduction of H2 (H2-TPR), and X-ray photoelectron spectroscopy (XPS). It is found that the support can strongly impact on the crystalline phase, the dispersity, and the reduction properties of In2O3. The catalytic tests during the EBDH-CO2 show that as compared to In2O3/MgO and In2O3/SiO2 with the merely existence of bulk In2O3 particles, the In2O3/Al2O3 catalyst gives the highest catalytic activity and good stability, which can be principally ascribed to the synergistic effect of the bulk In2O3 and in situ metallic In formed by the reduction of the well-dispersed In2O3 on the Al2O3 surface. It therefore affirms that attaining an appropriate support to disperse the active phase In2O3 becomes the decisive factor to achieve both superior catalytic activity and satisfied selectivity towards styrene.

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一种新型高效 In 基催化剂用于乙苯与 CO2 的脱氢反应
采用萌发湿润浸渍法制备了一系列二元 In2O3/S(S = Al2O3、SiO2 和 MgO)催化剂,并首先将其应用于二氧化碳存在下的乙苯脱氢反应(EBDH-CO2)。通过 X 射线衍射 (XRD)、扫描电子显微镜 (SEM)、透射电子显微镜 (TEM)、N2 吸附-解吸等温线、NH3 和 CO2 的温度编程解吸 (NH3/CO2-TPD)、H2 的温度编程还原 (H2-TPR) 和 X 射线光电子能谱 (XPS) 对合成的催化剂进行了系统表征。研究发现,支撑物会对 In2O3 的晶相、分散性和还原性产生强烈影响。EBDH-CO2 催化测试表明,与仅存在块状 In2O3 颗粒的 In2O3/MgO 和 In2O3/SiO2 相比,In2O3/Al2O3 催化剂具有最高的催化活性和良好的稳定性,这主要归功于块状 In2O3 和 Al2O3 表面分散良好的 In2O3 还原形成的原位金属 In 的协同效应。因此,要获得优异的催化活性和对苯乙烯的满意选择性,获得分散活性相 In2O3 的适当支撑物是决定性因素。
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来源期刊
Journal of Porous Materials
Journal of Porous Materials 工程技术-材料科学:综合
CiteScore
4.80
自引率
7.70%
发文量
203
审稿时长
2.6 months
期刊介绍: The Journal of Porous Materials is an interdisciplinary and international periodical devoted to all types of porous materials. Its aim is the rapid publication of high quality, peer-reviewed papers focused on the synthesis, processing, characterization and property evaluation of all porous materials. The objective is to establish a unique journal that will serve as a principal means of communication for the growing interdisciplinary field of porous materials. Porous materials include microporous materials with 50 nm pores. Examples of microporous materials are natural and synthetic molecular sieves, cationic and anionic clays, pillared clays, tobermorites, pillared Zr and Ti phosphates, spherosilicates, carbons, porous polymers, xerogels, etc. Mesoporous materials include synthetic molecular sieves, xerogels, aerogels, glasses, glass ceramics, porous polymers, etc.; while macroporous materials include ceramics, glass ceramics, porous polymers, aerogels, cement, etc. The porous materials can be crystalline, semicrystalline or noncrystalline, or combinations thereof. They can also be either organic, inorganic, or their composites. The overall objective of the journal is the establishment of one main forum covering the basic and applied aspects of all porous materials.
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