A analysis staff led by Prof. Pan Xiulian and Prof. Bao Xinhe from the Dalian Institute of Chemical Physics (DICP) of the Chinese language Academy of Sciences has achieved the direct synthesis of isoparaffin-rich gasoline from syngas utilizing ZnAlOx-SAPO-11 oxide-zeolite (OXZEO) catalysts. Isoparaffins are most well-liked parts of high-quality gasoline as a result of they’re extra environmentally pleasant as octane quantity contributors than olefins or aromatics.
The researchers elucidated the energetic websites of isoparaffin formation, which offered steering for the one-step synthesis of high-quality gasoline from syngas. Their research is revealed in ACS Power Letters.
Beforehand, the DICP staff proposed a brand new catalyst idea primarily based on steel oxide-zeolite (OXZEO) bi-functional catalysts. This catalyst enabled the direct conversion of syngas to quite a lot of chemical substances and fuels with excessive selectivity, akin to gentle olefins, ethylene, gasoline, aromatics and oxygenates. The OXZEO idea offered a brand new expertise platform for the extremely environment friendly utilization of coal and different carbon sources.
Direct syngas conversion to isoparaffin-rich gasoline over OXZEO catalyst. Credit score: Feng Jingyao
On this research, they achieved 34% CO conversion and 82% gasoline selectivity by modulating the distribution of the zeolite acid websites, during which the iso/n-paraffins ratio was as excessive as 38.
By optimizing the response situations, they elevated the ratio of iso/n-paraffins as excessive as 48—the very best worth of the iso/n-paraffins ratio reported to date.
Furthermore, a 150-hour on stream check of the catalyst indicated quite steady exercise within the syngas-to-gasoline course of.
Additional research confirmed that the exterior acid websites of the zeolite may very well be the energetic websites for the formation of branched—particularly multi-branched—isoparaffins.
Jingyao Feng, Dengyun Miao, Yilun Ding, Feng Jiao, Xiulian Pan, and Xinhe Bao (2022) “Direct Synthesis of Isoparaffin-rich Gasoline from Syngas,”
ACS Power Letters 7 (4), 1462-1468 doi: 10.1021/acsenergylett.2c00467