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Hydrogenation of benzoic acid to benzyl alcohol over Pt/SnO2
Applied Catalysis A: General ( IF 4.7 ) Pub Date : 2020-01-18 , DOI: 10.1016/j.apcata.2020.117420
Xiaohan Chen , Ziyun Wang , Helen Daly , Richard Morgan , Haresh Manyar , Conor Byrne , Alex S. Walton , S.F. Rebecca Taylor , Matthew Smith , Robbie Burch , Peijun Hu , Christopher Hardacre

Hydrogenation of benzoic acid in the liquid phase over Pt/SnO2 has afforded excellent selectivity to benzyl alcohol under mild reaction conditions (97% at 98% conversion of benzoic acid). DFT calculations have shown that the favoured mode of adsorption of benzoic acid switched from the aromatic ring to the acid carbonyl group with partial reduction of the SnO2 support. The switch in adsorption mode corroborates the experimentally observed selectivity with acid carbonyl group adsorption and hydrogenation occurring over Pt/SnO2. Reduction of Pt/SnO2 was observed by in-situ XPS forming a degree of metallic tin and complete reduction of Pt which could lead to Pt-Sn alloy phases and/or migration of SnOx onto Pt blocking sites for ring hydrogenation. No hydrogenation of benzene or the benzene ring of benzoic acid was observed over Pt/SnO2 with oxidic tin species at the interface of Pt particles proposed to activate the acid carbonyl group for hydrogenation.



中文翻译:

Pt / SnO 2上苯甲酸加氢制苯甲醇

在温和的反应条件下,通过Pt / SnO 2在液相中苯甲酸加氢可提供优异的对苯甲醇的选择性(苯甲酸转化率为98%时为97%)。DFT计算表明,随着SnO 2载体的部分还原,有利的苯甲酸吸附模式从芳环转变为酸性羰基。吸附模式下的转换证实了实验观察到的选择性与Pt / SnO 2上发生的酸性羰基吸附和氢化反应有关。通过原位XPS形成一定程度的金属锡和完全还原Pt可以观察到Pt / SnO 2的还原,这可能导致Pt-Sn合金相和/或SnO x迁移到Pt封闭位点进行环氢化。在Pt / SnO 2上未观察到苯的氢化或苯甲酸的苯环的氢化,在Pt颗粒的界面上有氧化锡物种,该活化的羰基酸被激活以活化羰基酸。

更新日期:2020-01-21
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