Borohydride reduction of Al2O3 supported NiCu bimetallic catalysts for the hydrogenation of styrene: study of surface properties

Muhammad, Syed Anuar Faua’ad Syed; Tan, Wen-Nee; Bakar, Noor Hana Hanif Abu; Bakar, M. Abu; Bettahar, M.M.

doi:10.1007/s11144-016-0980-2

Cited by 4 publications

(4 citation statements)

References 61 publications

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“…Trends obtained for H 2 chemisorbed on the surface of the bimetallic catalysts in this study are in agreement with the literature. − Addition of copper to the nickel catalyst has little effect on the quantity of hydrogen adsorbed since Cu does not dissociatively chemisorb hydrogen . This implies that the nickel surface remains essentially intact upon the addition of copper.…”

Section: Resultssupporting

confidence: 89%

“…68−73 Addition of copper to the nickel catalyst has little effect on the quantity of hydrogen adsorbed since Cu does not dissociatively chemisorb hydrogen. 72 This implies that the nickel surface remains essentially intact upon the addition of copper. The shift in selectivity toward n-butanol instead of C 6+ alcohols as copper is added, which reflects the reduced catalyst activity for secondary Guerbet reactions, may be attributable to the formation of isolated CuO instead of the inverse spinel CuAl 2 O 4 structure on the surface.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Condensed-Phase Ethanol Conversion to Higher Alcohols over Bimetallic Catalysts

Nezam

Zak

Miller

2020

Ind. Eng. Chem. Res.

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The catalytic condensation of ethanol to n-butanol and higher alcohols, known collectively as Guerbet reactions, has attracted attention in recent years as ethanol becomes increasingly available as a biorenewable feedstock. Results are presented here for the continuous, condensed-phase conversion of ethanol to higher alcohols using Ni/La2O3/γ-Al2O3 catalysts and for catalysts containing a second metal (Cu, Co, Pd, Pt, Fe, Mo) in addition to nickel. Detailed characterization of the catalyst surface and bulk properties has been carried out and is correlated to catalyst activity and selectivity. The best results obtained for nickel catalysts are a selectivity to higher alcohols of 75–80% and a turnover frequency of 200 mol ethanol/mol Ni site/h at 230 °C. The addition of cobalt nearly doubles the ethanol conversion rate relative to Ni alone, with only a slight reduction in higher alcohol selectivity. Results of catalyst characterization, a simple kinetic model, and experiments with reaction intermediates support the initial dehydrogenation of ethanol as the rate-limiting step of the condensed-phase reaction.

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Section: Resultssupporting

confidence: 89%

Section: ■ Results and Discussionmentioning

confidence: 99%

Condensed-Phase Ethanol Conversion to Higher Alcohols over Bimetallic Catalysts

Nezam

Zak

Miller

2020

Ind. Eng. Chem. Res.

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“…As can be seen, the 5.9wt% Ni-Al 2 O 3 /C gives rise to three main peaks positioned at 385 K, 442 K and 709 K respectively. Previous work has shown that the peaks at lower temperatures of 385 K and 442 K are attributed to H 2 weakly adsorbed onto Ni active sites [9]. In contrast, the peak arising at 709 K can be assigned to several factors such as H 2 strongly bonded to the Ni particles, hydrogen retained at the metal-support interphase or H 2 spillover [16].…”

Section: Characterization Of Ni-al 2 O 3 /C Catalystsmentioning

confidence: 95%

“…Amongst these, Ni is the cheapest and is available in abundance. As such, studies on hydrogenation catalysts based on mono-Ni supported alumina [3], silica [4] and sepiolite [5] as well as bimetallic Ni-Pt/alumina [7], Ni-B/MWCNT [8], Ni-Cu/alumina [9] can be found in the literature. The reason behind the numerous studies available is basically because the catalytic hydrogenation of a compound can be affected by several factors such as the metal content, type of support and preparation procedures for the catalysts.…”

Section: Introductionmentioning

confidence: 99%

Hydrogenation of Liquid Styrene by Alumina Supported Nickel Catalysts: Comparison between Classical and Non-Classical Methods

Tan

Bakar

Tan

et al. 2016

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Almina supported Ni catalysts (Ni/Al 2 O 3 ) with different Ni weight percentages (wt%) were prepared via classical and non-classical methods. All samples were prepared via impregnation technique. The samples prepared via non-classical methods were reduced using KBH 4 as the reducing agent. The catalysts were tested for the hydrogenation of styrene in liquid phase. Optimum activation conditions for the hydrogenation reaction were found to be 633 K for 2 hours. Comparison of the catalytic reactivity for all catalysts at these activation conditions showed that catalysts prepared via classical methods exhibited better activity. Furthermore the 7.6wt% Ni-Al 2 O 3 /C showed enhanced activity when compared to the 5.9wt% and 13.8wt% Ni-Al 2 O 3 /C catalyst. This phenomenon is mainly attributed to the type of Ni active sites available on the catalyst. The surface properties of the catalysts investigated via H 2 -temperature programmed reduction (H 2 -TPR), H 2 -chemisorption and H 2 -temperature programmed desorption (H 2 -TPD) confirm this.

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