Surface titanium oxide loaded on a special alumina as high-performance catalyst for reduction of cinnamaldehyde by isopropanol

Abstract

Abstract:

A nanocomposite catalyst with a nonstoichiometric titanium oxide loaded on a special nanotubular alumina (γ-Al₂O₃-nt) was developed and used to reduce cinnamaldehyde to cinnamyl alcohol with sacrificial isopropanol, i.e., a Meerwein-Ponndorf-Verley type reaction. The deposition process produced a highly disperse layer of titanium oxide on the surface of a γ-Al₂O₃-nt support. After a reduction treatment, the as-prepared TiO_x/γ-Al₂O₃-nt was a highly efficient catalyst for the hydrogen transfer reaction between isopropanol and cinnamaldehyde. Selectivity for cinnamic alcohol was higher than 99% and the conversion of cinnamaldehyde was higher than 95%. The regular morphology of the γ-Al₂O₃-nt support with homogeneous surface sites and the uniformly dispersed titanium oxide featured a high concentration surface Ti(Ⅲ) species. These factors contributed to the high performance of the TiO_x/γ-Al₂O₃-nt catalyst.

Key words: Meerwein-Ponndorf-Verley reduction, Cinnamaldehyde, Nanotubular alumina, Regular morphology, Ti (III) species

Weimeng Cai, Jie Yang, Hongfang Sun, Yibo Wang, Tie Ling, Xuefeng Guo, Luming Peng, Weiping Ding. Surface titanium oxide loaded on a special alumina as high-performance catalyst for reduction of cinnamaldehyde by isopropanol[J]. Chinese Journal of Catalysis, 2017, 38(8): 1330-1337.

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