2026-08-20T06:01:47Zhttps://docta.ucm.es/rest/oai/request
oai:docta.ucm.es:20.500.14352/712862023-08-26T06:20:58Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense author Gómez Martín, José María author Montes, Ignacio author Díez Alcántara, Eduardo author Rodríguez Rodríguez, Araceli 2023-06-22T10:40:21Z 2023-06-22T10:40:21Z 2022-12 1387-1811 10.1016/j.micromeso.2021.111618 https://hdl.handle.net/20.500.14352/71286 https://doi.org/10.1016/j.micromeso.2021.111618 Synthesis of Low Silica X zeolite (LSX) with hierarchical porosity was achieved. The low silicon/aluminum ratio of this zeolite allowed to increase the number of active sites, as cationic positions (>25%) respect to the previous mesoporous X zeolite. Mesoporosity was induced by using sodium dodecylbenzene sulfonate (SDBS) during the synthesis. A dissolution time of 24 h for SDBS improved the zeolite crystallinity, maintaining the FAU characteristic framework, with a silicon/aluminum molar ratio near the unity (<1.1), limit of the Lowenstein’ rule. The surfactant removal at 773 K promoted the development of a wider pore size distribution. The heating rate highly determined the pore size distribution, resulting in a bimodal distribution (maxima at 80 Å and 290 Å) at low heating rate (1.3 K/min) and a unimodal distribution, with a maximum at 230 Å, at higher heating rate (8 K/min). The analysis by Transmission Electronic Microscopy (TEM) showed the mesoporous cavities in the zeolite nanoparticles. These cavities were generated by the SDBS spherical micelles removal. Mesoporous Low Silica X zeolite (MLSX) showed higher catalytic activity than the same zeolite without mesoporosity in the deoxygenation of oleic acid. The conversion reached a constant value around 100% with higher yield toward C9–C18 hydrocarbons, representative fraction of sustainable aviation fuel (SAF). Therefore, this new mesoporous low silica X zeolite (MLSX) has a significant potential use as catalyst in the processing of bulky molecules. eng Atribución-NoComercial-SinDerivadas 3.0 España Mesoporous low silica X (MLSX) zeolite: Mesoporosity in loewenstein limit? journal article URL https://docta.ucm.es/bitstreams/a41e05b0-2bf5-4328-a7a9-c02851eee4b9/download File MD5 b15e7db9f84433e4afe1b8e6d9c85717 12314091 application/pdf 1-s2.0-S1387181121007447-main.pdf URL https://docta.ucm.es/bitstreams/081780e6-40ce-47b2-8b36-926d35f21a44/download File MD5 cd5503654b27e504e4a5cd990484613f 50595 text/plain 1-s2.0-S1387181121007447-main.pdf.txt