Acid Modification Method for Preparation of Attapulgite/Cordierite Coating Honeycomb and its Environmental Applications

IF 1.3 4区化学 Q4 CHEMISTRY, PHYSICAL Kinetics and Catalysis Pub Date : 2024-08-15 DOI:10.1134/S0023158423600931

Wei Liu, Fengqin Wu, Jingwei Liu, Jie Meng, Bingying Gao, Shixiang Zuo, Chao Yao

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Abstract

The specific surface area of attapulgite was significantly enhanced (from 128 to 212 m²/g) by its purification with sodium hexametaphosphate and nitric acid. Subsequently, an acid modification method was employed to prepare a coated attapulgite cordierite honeycomb with a specific surface area approximately 39 times larger than that of the bare cordierite honeycomb. SEM images showed that the surface of the cordierite was rough and uneven, with the attapulgite filling the large pores on its surface, forming a “nail-like” interaction between the coating and the carrier. After loading the catalyst, no significant mass loss was observed after 1 h of ultrasonic testing, indicating good adhesion stability of the coating. Furthermore, under test conditions of GHSV (Gas Hourly Space Velocity) = 10 000 h^–1 and a toluene concentration of 1500 ppm, the prepared integrated catalyst exhibited excellent activity for the catalytic oxidation of toluene, with T₅₀ and T₉₀ values of 261 and 290°C, respectively, suggesting broad application prospects.

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制备凹凸棒石/堇青石涂层蜂窝的酸性改性方法及其环境应用

摘要用六偏磷酸钠和硝酸提纯后，阿塔波来石的比表面积显著增加（从 128 m2/g 增加到 212 m2/g）。随后，采用酸改性方法制备出了比表面积约为裸堇青石蜂窝的 39 倍的涂层堇青石蜂窝。扫描电子显微镜图像显示，堇青石表面粗糙不平，阿塔波来石填充了其表面的大孔隙，在涂层和载体之间形成了 "钉子状 "的相互作用。载入催化剂后，经过 1 小时的超声波测试，没有观察到明显的质量损失，表明涂层具有良好的附着稳定性。此外，在 GHSV（气体时空速度）= 10 000 h-1 和甲苯浓度为 1500 ppm 的测试条件下，制备的集成催化剂在甲苯催化氧化方面表现出优异的活性，T50 和 T90 值分别为 261 和 290°C，应用前景广阔。

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来源期刊

Kinetics and Catalysis 化学-物理化学

CiteScore

2.10

自引率

27.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Kinetics and Catalysis Russian is a periodical that publishes theoretical and experimental works on homogeneous and heterogeneous kinetics and catalysis. Other topics include the mechanism and kinetics of noncatalytic processes in gaseous, liquid, and solid phases, quantum chemical calculations in kinetics and catalysis, methods of studying catalytic processes and catalysts, the chemistry of catalysts and adsorbent surfaces, the structure and physicochemical properties of catalysts, preparation and poisoning of catalysts, macrokinetics, and computer simulations in catalysis. The journal also publishes review articles on contemporary problems in kinetics and catalysis. The journal welcomes manuscripts from all countries in the English or Russian language.