Sub-Monolayer Control of Mixed-Oxide Support Composition in Catalysts via Atomic Layer Deposition: Selective Hydrogenation of Cinnamaldehyde Promoted by (SiO2-ALD)-Pt/Al2O3
Sub-Monolayer Control of Mixed-Oxide Support Composition in Catalysts via Atomic Layer Deposition: Selective Hydrogenation of Cinnamaldehyde Promoted by (SiO2-ALD)-Pt/Al2O3
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DOI：
10.1021/acscatal.8b02431
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发表时间：
2018-08
期刊：
影响因子：
12.9
通讯作者：
Zhihuan Weng;F. Zaera
中科院分区：
文献类型：
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作者：
Zhihuan Weng;F. Zaera
为了调节氧化铝载体铂催化剂的酸碱和电子性质，用原子层沉积(ALD)法制备了氧化硅薄膜，并考察了其对肉桂醛加氢反应的催化性能。研究发现，二氧化硅层极大地提高了铂纳米粒子的稳定性，阻止了其在高温焙烧过程中的烧结，而不会对接触金属表面产生任何显著影响；红外吸收光谱测量的CO吸附程度在6次SiO_2 ALD循环后仅下降了三分之一。另外的Bronsted和Lewis酸位是在沉积氧化硅的亚单分子层时产生的，通过吡啶吸附进行了探测。二氧化硅薄膜的加入降低了这些催化剂的整体活性，但也提高了它们对不饱和醇生产的选择性。此外，这两种周转频率...
Alumina-supported platinum catalysts have been modified with silicon oxide thin films grown using atomic layer deposition (ALD) in order to tune the acid–base and electronic properties of the oxide, and their performance has been tested for the hydrogenation of cinnamaldehyde. It was found that the silica layers greatly increase the stability of the platinum nanoparticles, preventing their sintering during high-temperature calcinations without affecting access to the metal surface in any significant way; the extent of CO adsorption, measured by infrared absorption spectroscopy was found to decrease by only one-third after 6 SiO2 ALD cycles. Additional Bronsted and Lewis acid sites were created upon the deposition of submonolayer coverages of silicon oxide, as probed via pyridine adsorption. The addition of the silicon oxide thin films reduced the overall activity of these catalysts but also increased their selectivity toward the production of the unsaturated alcohol. In addition, both turnover frequencies...