Suspension-washcoat optimization for preparing copper-manganese oxide structured catalyst towards flue gas CO purification

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL Colloids and Surfaces A: Physicochemical and Engineering Aspects Pub Date : 2024-11-05 DOI:10.1016/j.colsurfa.2024.135714

Xuan Zhang , Jiaxin Liu , Jinglei Tian , Jinzhe Liu , Xiong Yang , Yingshu Liu , Jinjuan Li , Chuanzhao Zhang , Ziyi Li

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Abstract

Structured catalysts play significant role in nowaday environmental industry. The copper-manganese oxide (Cu-Mn) is a low cost and efficient catalyst for CO purification from flue gas, for which a robust preparation regarding stabilized suspension and washcoat process is still lacked. This work addressed this challenge by constructing the catalyst suspension by introducing absorbent polymer (SAP), polyvinyl alcohol (PVA), and nano-silica sol (SiO₂-NA). The effects of the dosage of SAP, PVA, and SiO₂-NA on suspension properties including viscosity, water-retention capacity and stability were systematically studied. The combined effect of the three additives regarding electrostatic-sterical stability and regionalized coating is demonstrated to avoids the destruction of connection between SiO₂-NA and Cu-Mn due to the thermal stress during the drying process. After calcination, SiO₂-NA is efficiently utilized, evenly distributed and tightly bonded to Cu-Mn catalyst, rendering strongly-attached, crack-free and compact washcoated layer. The optimized structured catalyst shows appreciable balance of loading (up to 182 kg/m³) and strength (powder shedding rate <1 wt%) without blockage. The potential of practical application was verified by CO purification from realistic iron-ore sintering flue gas with catalytic efficiency of above 90 % for 240 h. These findings indicated a promising strategy to design Cu-Mn structured catalysts efficient for industrial use.

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优化悬浮-水洗涂层，制备用于烟道气 CO 净化的铜锰氧化物结构催化剂

结构催化剂在当今的环保产业中发挥着重要作用。铜锰氧化物（Cu-Mn）是一种用于净化烟道气中 CO 的低成本高效催化剂，但目前仍缺乏有关稳定悬浮液和洗涤涂层工艺的可靠制备方法。本研究通过引入吸收性聚合物（SAP）、聚乙烯醇（PVA）和纳米二氧化硅溶胶（SiO2-NA）来构建催化剂悬浮液，解决了这一难题。系统研究了 SAP、PVA 和 SiO2-NA 的用量对悬浮液特性（包括粘度、保水能力和稳定性）的影响。结果表明，三种添加剂在静电-静电稳定性和区域化涂层方面的共同作用可避免 SiO2-NA 和铜-锰之间的连接因干燥过程中的热应力而遭到破坏。煅烧后，SiO2-NA 被有效利用，均匀分布，并与 Cu-Mn 催化剂紧密结合，形成附着力强、无裂纹、致密的水洗涂层。优化后的结构催化剂在装填量（高达 182 kg/m3）和强度（粉末脱落率为 1 wt%）之间表现出明显的平衡，且无堵塞现象。实际应用的潜力通过从现实的铁矿烧结烟气中净化 CO 得到了验证，240 小时的催化效率超过 90%。这些研究结果表明，设计高效的 Cu-Mn 结构催化剂用于工业用途是一种很有前途的策略。

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来源期刊

Colloids and Surfaces A: Physicochemical and Engineering Aspects 化学-物理化学

CiteScore

8.70

自引率

9.60%

发文量

2421

审稿时长

56 days

期刊介绍： Colloids and Surfaces A: Physicochemical and Engineering Aspects is an international journal devoted to the science underlying applications of colloids and interfacial phenomena. The journal aims at publishing high quality research papers featuring new materials or new insights into the role of colloid and interface science in (for example) food, energy, minerals processing, pharmaceuticals or the environment.