Precisely Tailoring Selectivity via Target Group's Steered Adsorption on Cu₂O/Tantalate Catalysts for Hydrogenation of 3‐Nitrostyrene

Abstract

The selective hydrogenation of nitroarenes bearing competitive reducible groups to produce functionalized amino compounds has wide application in industrial production. However, to control only reducing the target group is still a challenge. Here, Cu 2 O/M 2 Ta 2 O 6 (M=H, Li, Na, K, Ag, Bi) catalysts were prepared to evaluate their catalytic performance using 3-nitrostyrene (3-NS) as a model reaction. The results confirm pristine Cu 2 O has a highly activity to hydrogenate 3-NS but low selectivity with the coexisted products of 3-vinylaniline (3-VA), 3-ethylaniline(3-EA) and 1-ethyl-3-nitrobenzene (3-NE), whereas the independent tantalate can converse 3-NS to sole product 3-VA via absolutely preferential reduction of À NO 2 moiety but with a low conversion rate. Importantly, if combining Cu 2 O and tantalate, the activity and selectivity of the appointed product were all obviously increased. Furthermore, the hydrogenation activity of 3-NS to generate 3-VA is positively related with the catalysts' intrinsic basicity and the preferential adsorption toward À NO 2 group.

High Active Catalyst of the Cu–Ag Bimetal Supported on Defect KTaO3 Nanosheets for the Selective Hydrogenation of Cinnamaldehyde to Cinnamyl Alcohol

“…The catalyst support plays the role of dispersing the metal on its surface, and thus it is critical to both the activity and the selectivity of the targeted selective hydrogenation . Previously, we confirmed that the tantalate component could well promote the selectivity of target groups in this type of catalytic transfer hydrogenation reaction . In addition, a large number of basic sites are present in KTaO 3 , which will facilitate the selective adsorption of –CO groups. , Combined with a series of advantages of tantalate, such as robustness, readily availability, relative inexpensiveness, and lower toxicity, KTaO 3 was selected in this investigation.…”

“…1 Previously, we confirmed that the tantalate component could well promote the selectivity of target groups in this type of catalytic transfer hydrogenation reaction. 24 In addition, a large number of basic sites are present in KTaO 3 , which will facilitate the selective adsorption of −C�O groups. 25,26 Combined with a series of advantages of tantalate, such as robustness, readily availability, relative inexpensiveness, and lower toxicity, 27 ■ EXPERIMENTAL SECTION Chemicals and Materials.…”