This study investigates the catalytic oxidation of NO to NO 2 over biomass-derived biochar at ambient temperature. Rubber seed shell (RSS) was used as lignocellulosic waste to develop biochar for NO capture. The NO adsorption capacity of pristine biochar was low, about 17.61 mg/g at 30 o C. To enhance the NO uptake capacity of biochar, cerium (Ce) was introduced into the biochar surface through simple impregnation method. Upon this, the NO adsorption capacity of 3 wt% Ce-loaded biochar profoundly increased to 75.59 mg/g at the same adsorption condition. This was confidently due to the excellent oxygen storage capacity of ceria which could react with free active sites on the biochar surface to form oxidized cites C(O). Characterization results indicated that the adsorbed species was in the form of -O-N=O, suggesting that the adsorption of NO was followed by reaction with surface oxidized sites to form NO 2 . Studying the kinetics of the NO adsorption using pseudo-second order, Avrami and Elovich models showed that chemisorption was the chief mechanism that governed the adsorption process and the activation energy for NO adsorption was estimated to be around −45 kJ/mol.

中文翻译：

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一氧化氮在铈浸渍生物质衍生生物炭上的低温吸附

本研究调查了在环境温度下通过生物质衍生的生物炭将 NO 催化氧化为 NO 2 的情况。橡胶种子壳 (RSS) 被用作木质纤维素废物来开发用于 NO 捕获的生物炭。原始生物炭的 NO 吸附能力较低，在 30 o C 时约为 17.61 mg/g。为了提高生物炭对 NO 的吸收能力，通过简单的浸渍方法将铈 (Ce) 引入生物炭表面。在此基础上，在相同吸附条件下，负载 3 wt% Ce 的生物炭的 NO 吸附容量显着增加至 75.59 mg/g。这肯定是由于二氧化铈具有出色的储氧能力，它可以与生物炭表面上的自由活性位点反应形成氧化的 C(O)。表征结果表明，吸附物质以-ON=O的形式存在，表明NO 吸附后与表面氧化位点反应形成NO 2 。使用伪二级研究 NO 吸附动力学，Avrami 和 Elovich 模型表明化学吸附是控制吸附过程的主要机制，NO 吸附的活化能估计约为 -45 kJ/mol。