As an abundant and renewable biological resource, straw has been attracting wide attention due to its distinctive tubular structure and property. Herein, soybean straw was pretreated by KOH and was used as a support for Pt nanoparticles (NPs) to realize efficient benzene combustion. The scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images of straw-derived samples illustrated the channel wall with open macropores and uniform distribution of Pt NPs in the straw skeleton. As a result, the temperature for 90% benzene conversion (T_90%) by Pt/KAC-3 (Pt/KAC-n, where n represents the mass ratio of straw to KOH that was varied between 1:1, 1:2, and 1:3) was determined to be 179 °C under a space velocity (SV) of 120 000 mL/(g·h). Additionally, thermal stability was enhanced to nearly 96 h. This performance is predominantly attributed to its inherent channel structure, which has open and accessible pores, resulting in a uniform distribution of Pt NPs. Such structure enables the rapid transfer of benzene molecules between channels and ensures the accessibility of Pt NPs. Furthermore, the diffusion properties were confirmed by Fick’s second law. This study demonstrated a design of more efficient catalysts while using a renewable and abundant biomaterial.

中文翻译：

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嵌入KOH活化大豆秸秆中的Pt纳米颗粒可作为有效的苯氧化催化剂

作为一种丰富的可再生生物资源，稻草因其独特的管状结构和特性而备受关注。此处，大豆秸秆经KOH预处理，并用作Pt纳米颗粒（NPs）的载体，以实现有效的苯燃烧。秸秆来源的样品的扫描电子显微镜（SEM）和透射电子显微镜（TEM）图像显示了带有开放大孔和Pt NPs在秸秆骨架中均匀分布的通道壁。其结果是，温度为90％的苯转化率（Ť _90％ ）由铂/ KAC-3（PT / KAC- Ñ，其中Ñ代表在1：1、1：2和1：3之间变化的秸秆与KOH的质量比）在120000 mL /（g·h）的空速（SV）下确定为179°C。此外，热稳定性提高到将近96小时。该性能主要归因于其固有的通道结构，该结构具有开放且可进入的孔，从而导致Pt NP的均匀分布。这种结构能够使苯分子在通道之间快速转移，并确保Pt NP的可及性。此外，扩散特性由菲克第二定律证实。这项研究表明，在使用可再生和丰富的生物材料的同时，设计了更高效的催化剂。