Deactivation of supported copper metal catalysts for hydrogenation reactions

Twigg, M. V.; Spencer, Michael S.

doi:10.1016/s0926-860x(00)00854-1

Cited by 370 publications

(242 citation statements)

References 40 publications

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“…It is well known that Cu/ZnO/Al 2 O 3 catalysts suffer thermal deactivation at temperatures exceeding 300-350 • C [47]. Therefore, some measures were taken in order to prevent deactivation of the catalysts in the present study.…”

Section: Catalyst Stabilitymentioning

confidence: 99%

Production of hydrogen from methanol over Cu/ZnO catalysts promoted by ZrO2 and Al2O3

Agrell

Birgersson

Boutonnet

et al. 2003

Journal of Catalysis

367

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Section: Catalyst Stabilitymentioning

confidence: 99%

Production of hydrogen from methanol over Cu/ZnO catalysts promoted by ZrO2 and Al2O3

Agrell

Birgersson

Boutonnet

et al. 2003

Journal of Catalysis

367

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“…Such conditions are required because biomass-derived molecules usually have low volatility and are produced by biomass depolymerization or biological transformation in dilute aqueous or solvent streams [4][5][6]. Irreversible deactivation, including by sintering and leaching, tends to be more pronounced in liquid-phase conditions, which makes catalyst stability even more critical [1,2,7].…”

Section: Introductionmentioning

confidence: 99%

Catalyst stabilization by stoichiometrically limited layer-by-layer overcoating in liquid media

Héroguel

Monnier

Brown

et al. 2017

Applied Catalysis B: Environmental

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a b s t r a c tThe use of metal oxide overcoats over supported nanoparticle catalysts has recently led to impressive improvements in catalyst stability and selectivity. The deposition of alumina is especially important for renewable catalysis due to its robustness in liquid-phase conditions. However, there are limited reports of work on alumina deposition and stabilization that goes beyond atomic layer deposition (ALD). Here, we present a layer-by-layer deposition technique for the controlled formation of conformal alumina overcoats in the liquid phase. This technique is easy to perform in common wet chemistry conditions. Alternated exposure of the substrate to stoichiometric amounts of aluminum alkoxide and water in liquidphase conditions leads to the formation of a porous overcoat that was easily tunable by varying synthesis parameters. The deposition of 60 Al 2 O 3 layers onto Al 2 O 3 -supported copper nanoparticles suppressed irreversible deactivation during the liquid-phase hydrogenation of furfural -a key biomass-derived platform molecule. The porous overcoat leads to highly accessible metal sites, which significantly reduces the partial site blocking observed in equivalent overcoats formed by ALD. We suggest that the ease of scalability and the high degree of control over the overcoat's properties during liquid-phase synthesis could facilitate the development of new catalyst overcoating applications.

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“…그러나 상기 고체 입자들의 비용 은 비교적 고가이며, 따라서 저렴한 비용으로 생산 가능한 입 자 개발이 요구되고 있다 [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. 현재까지 가장 잘 알려진 HCl 제거 공정은 CaO, Ca(OH)2 등을 이용하는 방법이며, 이때의 운전온도는 500 ℃ 이하이다 [2][3][4].…”

Section: 서 론unclassified

Effect of Pressure on HCl Absorption Behaviors of a K-based Absorbent in the Fixed Bed Reactor

Cheol¹,

Jo²,

Ryu³

et al. 2013

Clean Technology

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주제어 : 염화수소, 고정층반응기, K-계열 흡수제, 압력, 연소전포집 Abstract : In this study, the hydrogen chloride removal using K-based dry sorbents (K2CO3/Al2O3, KEPRI, Korea) was studied with varying the pressure in a fixed bed reactor (15 cm tall bed with 0.5 cm I.d.). Working temperature was 400℃ and feed gas concentration was 750 ppm (HCl vol%, N2 balance). The chloride sorption capacity of sorbent increases with increasing pressure (1, 5, 10, 15 and 20 bar). Also, after forming KCl crystal by reaction with K2CO3 and HCl, owing to the strong bonding energy, sorbent regeneration was practically impossible. Its optical, physical and chemical characterizations were evaluated by SEM, EDAX, BET, TGA and XRD. At 400 ℃ and 20 bar condition, working condition for the dehalogenation process after gasification, K-based dry sorbent showed high HCl sorption capacity and HCl/N2 separation performances comparing with Ca-based and Mg-based dry sorbents.

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Deactivation of supported copper metal catalysts for hydrogenation reactions

Cited by 370 publications

References 40 publications

Production of hydrogen from methanol over Cu/ZnO catalysts promoted by ZrO2 and Al2O3

Production of hydrogen from methanol over Cu/ZnO catalysts promoted by ZrO2 and Al2O3

Catalyst stabilization by stoichiometrically limited layer-by-layer overcoating in liquid media

Effect of Pressure on HCl Absorption Behaviors of a K-based Absorbent in the Fixed Bed Reactor

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