Paper-structured fiber composites impregnated with platinum nanoparticles synthesized on a carbon fiber matrix for catalytic reduction of nitrogen oxides

Koga, Hirotaka; Umemura, Yuuka; Ishihara, Hirotake; Kitaoka, Takuya; Tomoda, Akihiko; Suzuki, Ryō; Wariishi, Hiroyuki

doi:10.1016/j.apcatb.2009.05.002

Cited by 31 publications

(18 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1). In addition, the paper-structured catalysts were highly effective in various catalytic processes, such as the photodecomposition of bisphenol A in water [21], methanol reforming for hydrogen production [22][23][24] and NOX removal for exhaust gas purification [25][26][27]. Several of our studies suggest that the paper-specific microstructure effectively improves the efficiency of catalytic reactions [28].…”

Section: Paper-like Fiber/catalyst Compositesmentioning

confidence: 99%

On-paper Synthesis of Metal Nanoparticles for Catalytic Applications

Koga

Kitaoka²

2011

Sen-i Gakkaishi

Self Cite

View full text Add to dashboard Cite

Metal catalysts have played essential roles in a wide range of chemical industrial processes [1][2][3]. For example, the copper/zinc oxide (Cu/ZnO) catalyst has been especially important for methanol synthesis [4] and alcohol reforming to produce hydrogen for fuel cell applications [5]. Energy, environmental and resource problems have escalated in recent times. Therefore, the development of high-performance catalytic materials that can effectively and selectively promote desired reactions is required for sustainability. Metal nanocatalystsNanosized metal particles have received an increasing amount of attention in various fields, such as in electronic [6], optical [7] and biomedical [8] applications, because of their unique and specific properties. In particular, the extremely large specific surface areas of metal nanoparticles (NPs) are very advantageous for effective catalytic reactions [9]. This has led to the active use of metal NPs as heterogeneous catalysts for a variety of industrial processes [9] including energy conversion, fine chemical synthesis and environmental cleanup. For example, gold (Au) nanocatalysts have received considerable interest for use in various reactions, including the reduction of 4-nitrophenol (4-NP) in the liquid phase [10] and low-temperature carbon monoxide (CO) oxidation [11] in the gas phase, even though bulk Au is typically regarded as an ineffective catalyst. However, the practical implementation of metal NPs is difficult, because they are difficult to handle and they aggregate easily, which minimizes their surface area. The aggregation of metal NPs results in the formation of ordinary bulk metals, and this consequently deteriorates their excellent functionalities. Therefore, catalytic metal NPs are generally attached to various support materials, such as polymers [9,12] and metal oxide powders [9,13]. Since these supported catalysts are fine and are handled with difficulty in practice, they are generally fashioned as beads or pellets. This eventually decreases their catalytic reactivity, because of the poor contact efficiency between the reactants and the catalytically active sites [14]. In addition, filling a reactor with solid catalysts can cause a high pressure drop, local reactant flow and an uneven thermal environment inside the catalyst layer, leading to an inefficient overall process, particularly for flow-type reactions. Therefore, establishing an efficient and practical immobilization technique that enables highly active metal NPs to be attached to and exposed on easyto-handle porous matrices is a challenge. On-paper Synthesis of Metal Nanoparticles for Catalytic ApplicationsDepartment of Agro-environmental Sciences, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan ( † Present address : Department of Biomaterials Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan)Abstract: We discuss the successful in ...

show abstract

Section: Paper-like Fiber/catalyst Compositesmentioning

confidence: 99%

On-paper Synthesis of Metal Nanoparticles for Catalytic Applications

Koga

Kitaoka²

2011

Sen-i Gakkaishi

Self Cite

View full text Add to dashboard Cite

show abstract

“…The kind and amount of ceramic binder should be selected in order to obtain a strong but flexible structure. In general, most published papers employ alumina sol as a binder for enhancing the physical strength of the catalyst paper [38,84,[86][87][88][89], although some papers use TiO2 sol [90,91] or SiO2 sol [92]. Our group is currently studying the use of borate compounds as binder to enhance the mechanical properties of ceramic papers.…”

Section: Ceramic Papersmentioning

confidence: 99%

Structured Catalysts for Soot Combustion for Diesel Engines

Banús¹,

Ulla²,

Miró³

et al. 2013

Diesel Engine - Combustion, Emissions and Condition Monitoring

View full text Add to dashboard Cite

“…In addition, catalyst papers are highly effective for a wide range of catalytic processes such as the photodecomposition of bisphenol A in water (Fukahori et al, 2003), methanol reforming for hydrogen production (Fukahori et al, 2006a(Fukahori et al, , 2008Koga et al, 2006Koga et al, , 2008a and removal of nitrogen oxides for exhaust gas purification (Ishihara et al, 2010). Moreover, our established papermaking technique allows the compounding of various functional fibers such as silicon carbide fibers (Fukahori et al, 2006b) and carbon fibers (Koga et al, 2009b) with high thermal conductivity, leading to further improvement of the catalytic performance. The results of these investigations suggest that paper-like fiber/catalyst composites prepared by a papermaking technique are promising catalytic materials for practical use.…”

Section: Catalytic Applicationsmentioning

confidence: 99%

“…The modified AgNPs are then covalently fixed on the surfaces of the H 2 Ti 3 O 7 nanobelts, forming AgNPs-modified H 2 Ti 3 O 7 nanobelts. The synthesis and immobilization of PtNPs have been accomplished on a carbon fiber pretreated with nitric acid to activate the surface (Koga et al, 2009b). Surface-activated carbon fibers are immersed in an aqueous solution of hexachloroplatinic acid, followed by evaporation to complete dryness and reduction by reducing agents such as hydrogen and sodium borohydride.…”

Section: Agnps Synthesis On Zno Whiskersmentioning

confidence: 99%