Enhanced ethanol production inside carbon-nanotube reactors containing catalytic particles

Pan, Xiulian; Fan, Zhiping; Chen, Wei; Ding, Yunjie; Luo, Hong-Yuan; Bao, Xinhe

doi:10.1038/nmat1916

Cited by 872 publications

(556 citation statements)

References 30 publications

Supporting

Mentioning

532

Contrasting

Unclassified

Order By: Relevance

“…24 TEM indicated that the particle size was not the only factor affecting the activity because the two fresh catalysts had similar size distributions. The catalyst supported on SBA-15, which has a pore diameter (6À8 nm) similar to that of the used CNTs, exhibited a much lower activity and a higher selectivity to the byproduct methane under the same reaction conditions.…”

Section: Gas-phase Reactionsmentioning

confidence: 99%

The Effects of Confinement inside Carbon Nanotubes on Catalysis

2011

Self Cite

View full text Add to dashboard Cite

T he unique tubular morphology of carbon nanotubes (CNTs) has triggered wide research interest. These structures can be used as nanoreactors and to create novel composites through the encapsulation of guest materials in their well-defined channels. The rigid nanotubes restrict the size of the encapsulated materials down to the nanometer and even the subnanometer scale. In addition, interactions may develop between the encapsulated molecules and nanomaterials and the CNT surfaces. The curvature of CNT walls causes the π electron density of the graphene layers to shift from the concave inner to the convex outer surface, which results in an electric potential difference. As a result, the molecules and nanomaterials on the exterior walls of CNTs likely display different properties and chemical reactivities from those confined within CNTs. Catalysis that utilizes the interior surface of CNTs was only explored recently. An increasing number of studies have demonstrated that confining metal or metal oxide nanoparticles inside CNTs often leads to a different catalytic activity with respect to the same metals deposited on the CNT exterior surface. Furthermore, this inside and outside activity difference varies based on the metals used and the reactions catalyzed.In this Account, we describe the efforts toward understanding the fundamental effects of confining metal nanoparticles inside the CNT channels. This research may provide a novel approach to modulate their catalytic performance and promote rational design of catalysts. To achieve this, we have developed strategies for homogeneous dispersion of nanoparticles inside nanotubes. Because researchers have previously demonstrated the insertion of nanoparticles within larger nanotubes, we focused specifically on multiwalled carbon nanotubes (MWCNTs) with an inner diameter (i.d.) smaller than 10 nm and double-walled carbon nanotubes (DWCNTs) with 1.0À1.5 nm i.d. The results show that CNTs with well-defined morphology and unique electronic structure of CNTs provide an intriguing confinement environment for catalysis.

show abstract

Section: Gas-phase Reactionsmentioning

confidence: 99%

The Effects of Confinement inside Carbon Nanotubes on Catalysis

2011

Self Cite

View full text Add to dashboard Cite

show abstract

“…Even smaller CNTs are required for some applications such as filter membrane, catalyst supports, and electronic devices. In addition, the CNTs with smaller diameters are more attractable for investigating their confinement effect [10,12,13,143].…”

Section: Obtaining Aao-cnts With Smaller Diametermentioning

confidence: 99%

“…Structural parameters of CNTs such as inner diameter, wall thickness, length, crystallinity, and electronic structure have a great influence on the performance of the supported particles or loaded matters [12][13][14][15]. Especially, the size of the CNT hollow core and electron density plays an important role in determining the property of the filled matters owing to the confinement effect and the difference in electron density between the exterior and interior CNT surface due to their different graphene curvature [14,16].…”

mentioning

confidence: 99%

Carbon nanotubes prepared by anodic aluminum oxide template method

et al. 2011

View full text Add to dashboard Cite

One of the most unique structural characteristics of carbon nanotubes (CNTs) differentiating from other carbon materials is their hollow nanochannles, which can be utilized for encapsulating and loading foreign matters. The anodic aluminum oxide (AAO) template technique enables the diameter, length, and cap structure control of the replicated CNTs, and thus shows advantages in pore structure control over the traditional CNT growth approaches. This review details the synthesis of CNTs with tunable diameter, length, wall thickness, and crystalline by using the AAO template method. The doping of heteroatoms and filling of foreign matters into AAO-CNTs are also addressed. Moreover, the main challenges and developing trends of the AAO template method are discussed.carbon nanotubes (CNTs), anodic aluminum oxide (AAO) template method, controllability Citation:Hou P X, Liu C, Shi C, et al. Carbon nanotubes prepared by anodic aluminum oxide template method.

show abstract

“…Carbon nanotubes exhibit a variety of interesting properties: high mechanical strength, high thermal conductivity, high electrical conductivity and good chemical stability in aggressive media, among others [15,16]. Recently, it was also reported that their inner tubule can be used to host inorganic nanowires and nanoparticles, or even be employed as a nanoreactor for carrying out catalytic reactions [17,18]. Finally, their surface can be easily functionalized, i.e.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the structure and chemical properties of some commercial carbon nanostructures

Tessonnier

Rosenthal

Hansen

et al. 2009

Carbon

312

255

View full text Add to dashboard Cite

For many years the scientific community has believed in a promising future for carbon nanotubes for various applications in such diverse fields as polymer reinforcement, adsorption, catalysis, electronics and medicine. Industrial production of carbon nanotubes and -fibers and the subsequent availability and decrease of price, have rendered this vision feasible. In the last years, several carbon nanomaterial products have been marketed by major chemical companies. In this work, we present an extensive characterization of a representative set of commercially available carbon nanomaterials. Special focus has been put on their quality, i.e. presence of metal or carbonaceous impurities but also homogeneity and structural integrity. The observations are of importance for subsequent use in catalysis where the presence of impurities or defects in the nanostructure can dramatically modify the activity of the catalytic material..

show abstract

Enhanced ethanol production inside carbon-nanotube reactors containing catalytic particles

Cited by 872 publications

References 30 publications

The Effects of Confinement inside Carbon Nanotubes on Catalysis

The Effects of Confinement inside Carbon Nanotubes on Catalysis

Carbon nanotubes prepared by anodic aluminum oxide template method

Analysis of the structure and chemical properties of some commercial carbon nanostructures

Contact Info

Product

Resources

About