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Recently, the research team of Academician Liu Zhongmin, researcher Zhu Wenliang and associate researcher Ni Youming of the National Engineering Laboratory of Methanol to Olefins, Dalian Institute of Chemicals, Chinese Academy of Sciences, designed a new catalyst to successfully realize the direct hydrogenation of carbon dioxide to produce aromatic hydrocarbons
.
The team designed a zinc-aluminum oxide (ZnAlOx) with a nanospinel structure, mixed with a nano-H-ZSM-5 molecular sieve with a high silicon-aluminum ratio, to make a new catalyst (ZnAlOx&H-ZSM-5).
The catalyst achieves 73.
9% aromatic selectivity in the hydrogenation of carbon dioxide to aromatics, and the selectivity of by-product methane is as low as 0.
4%.
It has been found that carbon dioxide can be hydrogenated on ZnAlOx to form dimethyl ether and methanol, which diffuse into the molecular sieve pores to form olefins, which in turn form aromatic hydrocarbons
.
Through infrared detection of 2,6-di-tert-butylpyridine, it was found that ZnAlOx could greatly cover the acid content on the outer surface of H-ZSM-5 grains after mixing with H-ZSM-5.
Compared to carbon monoxide hydrogenation, carbon dioxide hydrogenation can form more formate species on the ZnAlOx surface, leaving fewer metal-active sites
.
These factors facilitate the hydrogenation of carbon dioxide to aromatic hydrocarbons
with high unsaturation.
