Basic intensity regulation of layered double oxide for CO2 adsorption process at medium temperature in coal gasification

IF 13.2 1区工程技术 Q1 ENGINEERING, CHEMICAL

Chemical Engineering Journal Pub Date : 2022-10-15 DOI:10.1016/j.cej.2022.136842

Binxia Wang , Xinyue Zhang , Yanan Liu , Dianqing Li , Yanjun Lin

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引用次数: 5

Abstract

High purity hydrogen for integrated gasification combined cycle power generation (IGCC) can be produced by efficient adsorption of CO₂ after water gas shift reaction in coal gasification. Based on adjustability of composition in layered double hydroxides (LDH) precursor, basicity intensity was modified and exhibited different adsorption capacity. Relationship among basic sites, CO₂-bound modes, and adsorption capacity were established. Furthermore, by utilizing LDH anionic exchangeability, we introduced laurate ion into LDH interlamellar, and further mediated surface structure using methyl cellulose with long carbon chain. As-obtained Mg₃Al-LDO-C12-MC effectively increased the number of medium/strong basic sites. Consequently, CO₂-adsorption capacity at medium temperature of 300 °C was further increased to 0.85 mmol/g with the maximum rate of 0.37 mmol/g·min. This work develops a strategy to regulate basic site of adsorbents according to structural mechanism for CO₂ elimination under medium temperature, and thus improve adsorption performance in industrial coal gasification process.

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煤气化中温条件下层状双氧化物吸附CO2过程的基本强度调节

利用煤气化过程中水煤气变换反应对CO2的有效吸附，可制取用于综合气化联合循环发电(IGCC)的高纯氢气。基于层状双氢氧化物(LDH)前驱体组成的可调节性，对碱度强度进行了调整，并表现出不同的吸附能力。建立了碱基位、co2结合模式与吸附量之间的关系。利用LDH的阴离子交换性，将月桂酸盐离子引入LDH层间，并利用长碳链甲基纤维素进一步介导表面结构。得到的Mg3Al-LDO-C12-MC有效地增加了中/强碱性位点的数量。结果表明，在300℃条件下，co2吸附量进一步提高到0.85 mmol/g，最大吸附速率为0.37 mmol/g·min。本文研究了在中温条件下，根据结构机理调节吸附剂的基本位置，从而提高工业煤气化过程中的吸附性能。

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来源期刊

Chemical Engineering Journal 工程技术-工程：化工

CiteScore

21.70

自引率

9.30%

发文量

6781

审稿时长

2.4 months

期刊介绍： The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.