Effects of Zr Addition on the Performance of the Pd-Pt/Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; Catalyst for Lean-Burn Natural Gas Vehicle Exhaust Purification

WANG, Yun.; Shang, Hongyan; Xu, Haidi; Zhong, Lin; CHEN, Jian-Jun.; Gong, Maochu; Chen, Yaoqiang

doi:10.3866/pku.whxb201507141

Cited by 3 publications

(1 citation statement)

References 43 publications

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“…Transition-metal NPs supported on oxide or carbon-based support are of great interest in heterogeneous catalysis duo to their unique catalytic properties 7 . They are widely used in many practical reactions, including petroleum refining 29 , steam reforming 30,31 , water-gas shift 32,33 , automobile exhaust treatment 1,34,35 , Fischer-Tropsch synthesis 36,37 , biomass conversions 38,39 , chemical upgrading [40][41][42] , and any other processes [43][44][45] . The catalytic performances of metal catalysts strongly depend on the size, composition, and structure of metal NPs 14, [46][47][48][49][50][51][52][53] .…”

Section: Precise Synthesis Of Supported Metal Catalystsmentioning

confidence: 99%

Atomic Layer Deposition: A Gas Phase Route to Bottom-up Precise Synthesis of Heterogeneous Catalyst

王恒伟¹,

路军岭²

2018

Acta Physico-Chimica Sinica

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Heterogeneous catalysts are usually synthesized by the conventional wet-chemistry methods, including wet-impregnation, ion exchange, and deposition-precipitation. With the development of catalyst synthesis, great progress has been made in many industrially important catalytic processes. However, these catalytic materials often have very complex structures along with poor uniformity of active sites. Such heterogeneity of active site structures significantly decreases catalytic performance, especially in terms of selectivity, and hinders atomic-level understanding of structureactivity relationships. Moreover, loss of exposed active components by sintering or leaching under harsh reaction conditions causes considerable catalyst deactivation. It is desirable to develop a facile method to tune catalyst active site structures, as well as their local chemical environments on the atomic level, thereby facilitating reaction mechanisms understanding and rational design of catalysts with high stability.Atomic layer deposition (ALD), a gas-phase technique for thin film growth, has emerged as an alternative method to synthesize heterogeneous catalysts. Like chemical vapor deposition (CVD), ALD relies on a sequence of molecular-level, self-limiting surface reactions between the vapors of precursor molecules and a substrate. This unique character makes it possible to deposit various catalytic materials uniformly on a high-surface-area support with nearly atomic precision. By tuning the number, sequence, and types of ALD cycles, bottom-up precise construction of catalytic architectures on a support can be achieved.In this review, we focus on the design and synthesis of supported metal catalysts using ALD. We first review strategies developed to precisely tailor the size, composition, and structures of metal nanoparticles (NPs) using ALD. Catalytic performances of these ALD metal catalysts are also discussed and compared to conventional catalysts. We highlight synthetic strategies for synthesis of metal single-atom catalysts and bottom-up precise synthesis of dimeric metal catalysts. Their impact on catalysis is discussed. We demonstrate that metal oxide ALD on metal NPs can enhance catalytic activity, selectivity, and especially stability. In particular, we show that site-selective blocking of metal NPs with an oxide overcoat improves selectivity and contributes to an understanding of the distinct functionalities of the low-and high-coordination sites in catalytic reactions on the atomic level. Next, we discuss an effective method to construct bifunctional catalysts via precisely-controlled addition of a secondary functionality using ALD. Finally, we summarize the advantages of ALD for the advanced design and synthesis of catalysts and discuss the challenges and opportunities of scaling up ALD catalyst synthesis for practical applications.

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Section: Precise Synthesis Of Supported Metal Catalystsmentioning

confidence: 99%

Atomic Layer Deposition: A Gas Phase Route to Bottom-up Precise Synthesis of Heterogeneous Catalyst

王恒伟¹,

路军岭²

2018

Acta Physico-Chimica Sinica

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Enhancement of activity and hydrothermal stability of Pd/ZrO 2 -Al 2 O 3 doped by Mg for methane combustion under lean conditions

Chen

et al. 2017

Fuel

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Effect of high temperature pretreatment on the thermal resistance properties of Pd/CeO2/Al2O3 close-coupled catalysts

Huang

Wang

et al. 2017

Journal of Rare Earths

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Effects of Zr Addition on the Performance of the Pd-Pt/Al<sub>2</sub>O<sub>3</sub> Catalyst for Lean-Burn Natural Gas Vehicle Exhaust Purification

Cited by 3 publications

References 43 publications

Atomic Layer Deposition: A Gas Phase Route to Bottom-up Precise Synthesis of Heterogeneous Catalyst

Atomic Layer Deposition: A Gas Phase Route to Bottom-up Precise Synthesis of Heterogeneous Catalyst

Enhancement of activity and hydrothermal stability of Pd/ZrO 2 -Al 2 O 3 doped by Mg for methane combustion under lean conditions

Effect of high temperature pretreatment on the thermal resistance properties of Pd/CeO2/Al2O3 close-coupled catalysts

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