ZnO/perovskite core–shell nanorod array based monolithic catalysts with enhanced propane oxidation and material utilization efficiency at low temperature

Wang, Sibo; Ren, Zheng; Song, Wenqiao; Guo, Yanbing; Zhang, Mingwan; Suib, Steven L.; Gao, Pu‐Xian

doi:10.1016/j.cattod.2015.03.026

Cited by 35 publications

(14 citation statements)

References 24 publications

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“…ZnO nanorod arrays were successfully synthesized on cordierite substrate ( Figure a) with uniform interspaces via a hydrothermal approach . By applying a continuous‐flow process, we have successfully suppressed the homogeneous nucleation of ZnO (seen as separate ZnO agglomerates on top of the arrays) significantly .…”

Section: Resultsmentioning

confidence: 99%

Cu‐Decorated ZnO Nanorod Array Integrated Structured Catalysts for Low‐Pressure CO₂ Hydrogenation to Methanol

Tang

et al. 2017

Adv Materials Inter

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CO2 conversion into valuable chemicals and fuels, such as methanol, is one of the most practical routes for utilizing emitted CO2 and mitigating global warming. Herein, a 3D Cu‐decorated ZnO nanorod array based structured catalysts for efficient thermochemical CO2 hydrogenation to methanol at relatively low pressures (<10 atm) is successfully fabricated and demonstrated. This new type of nanorod array integrated structured catalysts has yielded a methanol formation rate of 1.9 mol h−1 kg−1 with a methanol selectivity of 56%, rivaling the state‐of‐the‐art powder‐form catalysts. The well‐dispersed copper species on the array structure as well as the array‐structure‐enhanced interfacial effect are key factors that improve the activity of the nanorod array catalysts in CO2 hydrogenation. The Cu‐ZnO nanorod array interface also suppresses reverse water‐gas shift reaction, reducing the selectivity to CO. Further improvement of the performance of the nanorod array based catalysts is demonstrated by tuning the ZnO nanorod array length. The developed nanorod array integrated monolithic catalysts also exhibit good stability during a long‐time continuous operation, demonstrating the potential and the feasibility of their practical implementation in industrial situation.

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Section: Resultsmentioning

confidence: 99%

Cu‐Decorated ZnO Nanorod Array Integrated Structured Catalysts for Low‐Pressure CO₂ Hydrogenation to Methanol

Tang

et al. 2017

Adv Materials Inter

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“…Therefore, growth on existing seeds is more favorable than nucleation in homogeneous bulk solution for the reason that the existing seeds help bypass or lower the thermodynamic energy barrier of the nucleation step [13]. A simple dip-coating method was employed to create a seeding layer onto the channel walls of 3D monolithic substrates, and the ultrasonic vibration technique could help to improve the uniformity of the seeding layers across the channels [12,14,15]. For example, Figure 2 displays the schematic of the growth of ZnO nano-arrays on monolithic cordierite substrate from the seeding step and the uniformity comparison between the ZnO nano-arrays with and without ultrasonic Catalysts 2017, 7, 253 4 of 24 vibration during the seeding procedure [14].…”

Section: Hydrothermal Synthesismentioning

confidence: 99%

Nano-Array Integrated Structured Catalysts: A New Paradigm upon Conventional Wash-Coated Monolithic Catalysts?

Weng

Gao

2017

Catalysts

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Abstract:The monolithic catalyst, namely the structured catalyst, is one of the important categories of catalysts used in various fields, especially in catalytic exhaust after-treatment. Despite its successful application in conventional wash-coated catalysts in both mobile and stationary catalytic converters, washcoat-based technologies are facing multi-fold challenges, including: (1) high Pt-group metals (PGM) material loading being required, driving the market prices; (2) less-than ideal distribution of washcoats in typically square-shaped channels associated with pressure drop sacrifice; and (3) far from clear correlations between macroscopic washcoat structures and their catalytic performance. To tackle these challenges, the well-defined nanostructure array (nano-array)-integrated structured catalysts which we invented and developed recently have been proven to be a promising class of cost-effective and efficient devices that may complement or substitute wash-coated catalysts. This new type of structured catalysts is composed of honeycomb-structured monoliths, whose channel surfaces are grown in situ with a nano-array forest made of traditional binary transition metal oxide support such as Al 2 O 3 , CeO 2 , Co 3 O 4 , MnO 2 , TiO 2 , and ZnO, or newer support materials including perovskite-type ABO 3 structures, for example LaMnO 3 , LaCoO 3 , LaNiO, and LaFeO 3 . The integration strategy parts from the traditional washcoat technique. Instead, an in situ nanomaterial assembly method is utilized, such as a hydro (solva-) thermal synthesis approach, in order to create sound structure robustness, and increase ease and complex-shaped substrate adaptability. Specifically, the critical fabrication procedures for nano-array structured catalysts include deposition of seeding layer, in situ growth of nano-array, and loading of catalytic materials. The generic methodology utilization in both the magnetic stirring batch process and continuous flow reactor synthesis offers the nano-array catalysts with great potential to be scaled up readily and cost-effectively. The tunability of the structure and catalytic performance could be achieved through morphology and geometry adjustment and guest atoms and defect manipulation, as well as composite nano-array catalyst manufacture. Excellent stabilities under various conditions were also present compared to conventional wash-coated catalysts.

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“…For example, our group developed a series of in situ technologies to grow various arrays of nanostructures such as nanorods, nanowires, and nanotubes onto 3D channeled monolithic substrates. [40][41][42][43][44][45][46][47] Instead of wash-coat-based catalysts, the nano-array integrated monoliths have well-defined structures and good uniformity. The superior properties of nanostructured materials can be fully kept on the monolith and give much higher materials utilization efficiency.…”

Section: Hierarchical Structurementioning

confidence: 99%

Nanostructured cerium oxide: preparation, characterization, and application in energy and environmental catalysis

Tang

Gao

2016

MRS Communications

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ZnO/perovskite core–shell nanorod array based monolithic catalysts with enhanced propane oxidation and material utilization efficiency at low temperature

Cited by 35 publications

References 24 publications

Cu‐Decorated ZnO Nanorod Array Integrated Structured Catalysts for Low‐Pressure CO₂ Hydrogenation to Methanol

Cu‐Decorated ZnO Nanorod Array Integrated Structured Catalysts for Low‐Pressure CO₂ Hydrogenation to Methanol

Nano-Array Integrated Structured Catalysts: A New Paradigm upon Conventional Wash-Coated Monolithic Catalysts?

Nanostructured cerium oxide: preparation, characterization, and application in energy and environmental catalysis

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ZnO/perovskite core–shell nanorod array based monolithic catalysts with enhanced propane oxidation and material utilization efficiency at low temperature

Cited by 35 publications

References 24 publications

Cu‐Decorated ZnO Nanorod Array Integrated Structured Catalysts for Low‐Pressure CO2 Hydrogenation to Methanol

Cu‐Decorated ZnO Nanorod Array Integrated Structured Catalysts for Low‐Pressure CO2 Hydrogenation to Methanol

Nano-Array Integrated Structured Catalysts: A New Paradigm upon Conventional Wash-Coated Monolithic Catalysts?

Nanostructured cerium oxide: preparation, characterization, and application in energy and environmental catalysis

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Cu‐Decorated ZnO Nanorod Array Integrated Structured Catalysts for Low‐Pressure CO₂ Hydrogenation to Methanol

Cu‐Decorated ZnO Nanorod Array Integrated Structured Catalysts for Low‐Pressure CO₂ Hydrogenation to Methanol