Melting-assisted solvent-free synthesis of SAPO-11 for improving the hydroisomerization performance of n-dodecane

Publication date: April 2020Source: Chinese Journal of Catalysis, Volume 41, Issue 4Author(s): Gan Yu, Xinqing Chen, Wenjie Xue, Lixia Ge, Ting Wang, Minghuang Qiu, Wei Wei, Peng Gao, Yuhan SunAbstractA novel melting-assisted solvent-free route using solid oxalic acid was proposed for the post-treatment of SAPO-11 zeolite, followed by loading with 0.5 wt% Pt by the incipient wetness impregnation method. Subsequently, the performance of the obtained bifunctional catalysts toward the hydroisomerization of n-dodecane was examined. The prepared samples were characterized by XRD, SEM, BET, XRF, Py-IR, and solid-state NMR. From the results, it was found that the high crystallinity and uniform morphology were retained after the post-treatment and that more (002) crystal faces were exposed, which was beneficial since more acid sites were provided. More importantly, the total Brönsted acid sites and the ratio (Ra) of the micropore area to the total surface area were optimized by this method. Thus, the catalytic performance was enhanced significantly, and the prepared Pt-SAPO-11-10% catalyst had the highest i-dodecane yield of 80.1% compared to 55.3% of Pt–SAPO-11. Expectedly, this facile and cost-effective method is promising for the hydroisomerization of normal paraffin in the production of lubricant base oils.Graphical AbstractSAPO-11 zeolite with high crystallinity and a suitable number of Brönsted acid sites is post-treated via a novel melting-assisted solvent-free route using...

Source: Chinese Journal of Catalysis - January 26, 2020 Category: Chemistry Source Type: research