Cardoso Mauricio, Portugau Patrice, De Los Santos Carolina, Faccio Ricardo, Vidal Hilario, Gatica José Manuel, Yesté María Del Pilar, Castiglioni Jorge, Torres Martin
Área Fisicoquímica, Facultad de Química, Universidad de la República, Gral. Flores 2124, Montevideo 11800, Uruguay.
Área Física, Facultad de Química, Universidad de la República, Gral. Flores 2124, Montevideo 11800, Uruguay.
Materials (Basel). 2024 Dec 12;17(24):6069. doi: 10.3390/ma17246069.
Rice husk, a byproduct of rice production, poses significant environmental challenges due to disposal issues, while the emission of volatile organic compounds into the atmosphere further exacerbates these concerns. This study addresses both problems by exploring the potential of texturally enhanced SiO, derived from Uruguayan rice husk, as a catalytic support for manganese oxides in the combustion of volatile organic compounds. SiO was synthesized from rice husk ash using a sustainable, acid-free pretreatment method, yielding a notably high silica purity of 96.5%-a level comparable to or exceeding previously reported values, highlighting the high silica quality inherent in Uruguayan rice husk. The catalytic activity was evaluated using acetone as a model volatile organic compound, achieving up to 90% conversion with 30 wt.% manganese oxide at 300 °C, with CO as the primary product. Furthermore, a 24 h stability test demonstrated consistent performance, maintaining a conversion rate of around 95.6 ± 2.5%. These findings suggest that high-purity SiO derived from Uruguayan rice husk, with its sustainability benefits, offers an effective solution for acetone removal when supporting an active phase such as manganese oxides, addressing both rice husk disposal and volatile organic compound emissions.
稻壳是大米生产的副产品，由于处置问题对环境造成重大挑战，而挥发性有机化合物排放到大气中进一步加剧了这些问题。本研究通过探索源自乌拉圭稻壳的质地增强型二氧化硅作为挥发性有机化合物燃烧中锰氧化物催化载体的潜力，解决了这两个问题。二氧化硅是采用可持续的无酸预处理方法从稻壳灰中合成的，二氧化硅纯度高达96.5%，与之前报道的值相当或更高，突出了乌拉圭稻壳中固有的高二氧化硅质量。以丙酮作为挥发性有机化合物模型评估催化活性，在300℃下使用30 wt.%的氧化锰时，转化率高达90%，主要产物为一氧化碳。此外，24小时稳定性测试表明性能稳定，转化率维持在95.6±2.5%左右。这些发现表明，源自乌拉圭稻壳的高纯度二氧化硅具有可持续性优势，在负载锰氧化物等活性相时，为丙酮去除提供了一种有效解决方案，解决了稻壳处置和挥发性有机化合物排放问题。
