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

doi:10.1016/S1872-2067(19)63466-2

Abstract

Abstract: A 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 (R_a) 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.

Key words: Hydroisomerization, Zeolite, SAPO-11, Melting-assist, Bifunctional catalyst

Gan Yu, Xinqing Chen, Wenjie Xue, Lixia Ge, Ting Wang, Minghuang Qiu, Wei Wei, Peng Gao, Yuhan Sun. Melting-assisted solvent-free synthesis of SAPO-11 for improving the hydroisomerization performance of n-dodecane[J]. Chinese Journal of Catalysis, 2020, 41(4): 622-630.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(19)63466-2

https://www.cjcatal.com/EN/Y2020/V41/I4/622

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