Robust 3-D configurated metal oxide nano-array based monolithic catalysts with ultrahigh materials usage efficiency and catalytic performance tunability

Guo, Yanbing; Ren, Zheng; Xiao, Wen; Liu, Caihong; Sharma, Hom N.; Gao, Hongyan; Mhadeshwar, Ashish B.; Gao, Pu‐Xian

doi:10.1016/j.nanoen.2013.03.004

Cited by 82 publications

(86 citation statements)

References 39 publications

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“…1c display the morphology and orientation of hierarchical Ni doped and pristine Co 3 O 4 nanowires on the monolithic cordierite honeycombs. The morphology characteristics are consistent with our previous reports [24,27,28]. Briefly, nanowires have smaller diameters when nitrate is used as the precursor in the synthesis.…”

Section: Structure Characterization Of Nano-array Catalysts By Electrsupporting

confidence: 91%

“…Recently, we have successfully invented and demonstrated new catalyst configurations, i.e., the nanostructure-array (nano-array) based monolithic catalysts, where hierarchical nanostructures such as nanowire arrays are integrated onto commercial cordierite honeycombs [24][25][26]. The unique geometrical and spatial arrangements of nano-array are shown to help reduce catalyst usage by 10-40 times with good catalytic oxidation performance and thermal/mechanical robustness.…”

Section: Introductionmentioning

confidence: 99%

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Low temperature propane oxidation over Co3O4 based nano-array catalysts: Ni dopant effect, reaction mechanism and structural stability

Ren

Song

et al. 2016

Applied Catalysis B: Environmental

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185

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a b s t r a c tLow temperature propane oxidation has been achieved by Co 3 O 4 -based nano-array catalysts featuring low catalytic materials loading (15 mg under flow rate of 150 mL/min). The increased Ni doping into the Co 3 O 4 lattice has led to 100% propane conversion at low temperature (<400 • C) and has enhanced reaction kinetics by promoting the surface lattice oxygen activity. In situ DRIFTS investigations in tandem with isotopic oxygen exchange reveals that the propane oxidation proceeds via a Mars-van Krevelen mechanism where surface lattice oxygen acts as the active site whereas O 2 in the reaction feed does not directly participate in CO 2 formation. The Ni doping promotes the formation of less stable carbonates on the surface to facilitate the CO 2 desorption. The thermal stability of Ni doped Co 3 O 4 decreases with increased Ni concentration despite the increased catalytic activity. A balance between enhanced activity and compromised thermal stability is considered in the Ni doped Co 3 O 4 nano-array catalysts for hydrocarbon oxidation. This study provides useful and timely guidance for rational catalyst design toward low temperature catalytic oxidation.

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Section: Structure Characterization Of Nano-array Catalysts By Electrsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Low temperature propane oxidation over Co3O4 based nano-array catalysts: Ni dopant effect, reaction mechanism and structural stability

Ren

Song

et al. 2016

Applied Catalysis B: Environmental

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185

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“…As-prepared nano-array structured catalysts exhibited good thermal stability in reductive atmosphere as well. TiO 2 nanorods on cordierite monolith showed high stability and inertness in H 2 atmosphere without structure changes up to 750 • C, while ZnO nanorods stayed stable in reduced atmosphere below 450 • C [36].…”

Section: Stability Propertiesmentioning

confidence: 98%

“…All the as-prepared nanostructure exhibited high stability and maintained the array structure and morphology either after 200 cycles of high pulsatile air flow (switched between 0 and 60 L/min) or under the static air with 50 L/min flux for 10 days. Additionally, directly grown single crystal TiO 2 and ZnO nano-array monolithic catalysts showed great stability and vibration resistance to mechanical vibrations (>1 h) introduced by Sonicator (42 KHz, 135 W) in both distilled water and ethanol [36]. Besides thermal and mechanical stability, long-term stability of catalytic performance is a substantial important factor for a reliable catalyst.…”

Section: Stability Propertiesmentioning

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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“…Among metal oxides, ZnO which is the representative of semiconducting and piezoelectric materials with a direct wide band gap of 3.37 eV and a large exciton binding energy of 60 meV at room temperature is regarded as a leading candidate for many scientific and technological applications [1]. Owing to their low cost, abundance, morphological and chemical flexibilities, one-dimensional ZnO nanostructure arrays can play a vital role in a wide range of applications including catalysts [2], solar cells [3], gas sensors [4], biosensors [5], photocatalysts [6], light-emitting diodes [7], and field-emission [8]. One-dimensional ZnO nanostructures have been synthesized by a wide variety of techniques, including wet chemical methods [9], metal-organic chemical vapor deposition (MOCVD) [10], physical vapor deposition [11], pulsed laser deposition [12], molecular beam epitaxy (MBE) [13], flux methods [14], electrospinning [15], top-down approaches by etching [16] and hydrothermal synthesis [17].…”

Section: Introductionmentioning

confidence: 99%

On finding of the optimized condition for preparation of aligned ZnO nanorod arrays on monolithic cordierite honeycomb

Safaee

Kazemzad

Alizadeh

et al. 2015

Ceramics International

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Robust 3-D configurated metal oxide nano-array based monolithic catalysts with ultrahigh materials usage efficiency and catalytic performance tunability

Cited by 82 publications

References 39 publications

Low temperature propane oxidation over Co3O4 based nano-array catalysts: Ni dopant effect, reaction mechanism and structural stability

Low temperature propane oxidation over Co3O4 based nano-array catalysts: Ni dopant effect, reaction mechanism and structural stability

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

On finding of the optimized condition for preparation of aligned ZnO nanorod arrays on monolithic cordierite honeycomb

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