Influence of Preparation Modes on Pt–Ni/CNTs Catalysts Used in the Selective Hydrogenation of Cinnamaldehyde to Hydrocinnamaldehyde

Li, Yan; Ge, Chunhua; Zhao, Jie; Zhou, Renxian

doi:10.1007/s10562-008-9610-6

Cited by 27 publications

(22 citation statements)

References 35 publications

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Section: Introductionmentioning

confidence: 99%

“…[1,4] Moreover, acetals and other unidentified high-molecular-weight compounds can also be produced in large quantities in these reactions. [4,5] Although much research has already been focused on this issue, the selective hydrogenation of a,b-unsaturated aldehydes remains a challenge.The selective hydrogenation of a,b-unsaturated aldehydes toward the unsaturated alcohol can be achieved with homogeneous catalysts such as metal hydrides, aluminium isopropoxide, and others. [6,7] However, it is desirable to develop an equal-ly selective heterogeneous catalyst as these are easier to handle and separate from the products.…”

mentioning

confidence: 99%

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Selective Hydrogenation of Cinnamaldehyde to Cinnamal Alcohol over Platinum/Graphene Catalysts

Niu

et al. 2014

ChemCatChem

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IntroductionThe selective hydrogenation of a,b-unsaturated carbonyl compounds is of theoretical and practical significance. [1][2][3] For instance, the hydrogenation of cinnamaldehyde (CAL) can produce cinnamal alcohol (COL), hydrocinnamaldehyde (HALD), and/or hydrocinnamal alcohol (HALC; Scheme 1), but the selective production of COL is difficult because the hydrogenation of the C=C bond is thermodynamically favored over that of the C=O moiety. [1,4] Moreover, acetals and other unidentified high-molecular-weight compounds can also be produced in large quantities in these reactions. [4,5] Although much research has already been focused on this issue, the selective hydrogenation of a,b-unsaturated aldehydes remains a challenge.The selective hydrogenation of a,b-unsaturated aldehydes toward the unsaturated alcohol can be achieved with homogeneous catalysts such as metal hydrides, aluminium isopropoxide, and others. [6,7] However, it is desirable to develop an equal-ly selective heterogeneous catalyst as these are easier to handle and separate from the products. To this end, a large number of studies on supported catalysts based on Pt, Rh, Au, Ru, and Pd active phases have been reported. [8][9][10][11][12] Cordier et al. reported that the selectivity for COL production from CAL hydrogenation follows the sequence Os > Ir > Pt > Ru > Rh > Pd, [13,14] a trend that was correlated with the width of the dband of the metal (Pd < Pt < Ir, Os). Many other studies have targeted supported Pt catalysts because of their high activity and moderate selectivity.In addition to the different metals that can be used to control selectivity in CAL hydrogenation processes, the supports may play an important role to define the selectivity. Indeed, differences in activity and selectivity may be obtained by varying the nature of the interaction between the support and nanoparticles (NPs). For instance, the selectivity toward COL production may be enhanced by using reducible oxides such as CeO 2 , [15] MnO 2 , [16] SnO 2 , [17] TiO 2 , [18] and ZnO [19] because of the electron transfer that takes place between these supports and Catalysts made of Pt nanoparticles dispersed on graphene (X wt %Pt/G, X = 2.0, 3.5, and 5.0) were prepared and characterized by XRD, Raman spectroscopy, BET surface area measurements, TEM, and X-ray photoelectron spectroscopy (XPS), and a 3.5 wt % Pt supported on Vulcan Carbon catalyst (3.5 wt %Pt/ VC) was included as a reference. Although the mean Pt nanoparticle size is approximately 4.4 nm for all X wt %Pt/G and 3.5 wt %Pt/VC catalysts, cinnamal alcohol was produced with high selectivity only with the graphene-supported catalysts:92 % conversion and 88 % selectivity toward cinnamal alcohol were obtained with 3.5 wt %Pt/G. This catalyst also showed good stability in recycling tests. The good selectivity observed with the graphene-based catalysts is attributed to the higher fraction of reduced surface Pt 0 atoms seen on the surface of the Pt nanoparticles (determined by XPS). This interpretation is consistent with D...

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Selective Hydrogenation of Cinnamaldehyde to Cinnamal Alcohol over Platinum/Graphene Catalysts

Niu

et al. 2014

ChemCatChem

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“…Further, Pd/ZIF‐8, Pd/CNT/AC, Pd/CNF, Pd/MWCNT, Pd/La 2 O 2 CO 3, Pd/MWNTs, Pd@TNTs, Pd/NMC, Pd/SiO 2 , Pd/Al 2 O 3, Pd/TiO 2 and Pd/Fe 2 O 3 @C were reported and all of them showed good activity towards selective hydrogenation of CAL to HCAL. Pt based catalysts like 0.3%Pt/ZrO 2 , 0.5%Pt/GRA, and 0.5%Pt/CNT are shown low activity compared to palladium based catalysts towards chemo selective hydrogenation of CAL to HCAL. Ni/C showed better performance in the liquid phase.…”

Section: Introductionmentioning

confidence: 99%

“…Among all reported Ni based catalysts, 10% Ni/SiO 2 catalyst showed better activity with almost complete conversion of CAL and high selectivity of HCAL (99%) in ethanol solvent at 373 K, under high pressure condition of hydrogen . Pt−Ni/CATs catalyst showed a significant activity and selectivity towards HCAL due to the electronic synergetic effect of Pt‐Ni−B . Mostly, all the above catalytic systems are producing HCAL by using high pressure hydrogen.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Hydrocinnamaldehyde via Vapor Phase Dehydrogenation of Hydrocinnamyl alcohol over Rice‐Derived MgO‐Supported Copper Catalysts

et al. 2018

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Green synthetic method for the production of hydrocinnamaldehyde via vapour phase dehydrogenation of hydrocinnnamyl alcohol over high surface area MgO (HSA-MgO) supported Cu catalyst at atmospheric pressure without using any additives has been attempted. Cu/HSA-MgO catalysts have been prepared by thermal decomposition of cooked rice grains mixed with magnesium acetate followed by wet impregnation by Cu. The prepared catalysts have been characterized by various physiochemical characterization techniques such as TGA, XRD, BET surface area, TPD of CO 2 , H 2 -TPR, TEM, SEM, EDX and N 2 O pulse chemisorption. Among all the catalysts, 10%Cu/HSA-MgO catalyst is found to be the best catalyst with 78% conversion of hydrocinnnamyl alcohol and 96% selectivity of hydrocinnamaldehyde. N 2 O pulse chemisorption and TPR analysis results divulge the high dispersion of smaller copper particles on the surface of HSA-MgO support which is considered to be responsible for its superior catalytic activity.

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“…Hydrogenolysis of C-O bond was also observed in gas phase hydrogenation over a platinum single crystal [51]. In addition to the products of hydrogenation, by-products due to the condensation of unsaturated compounds or dehydration of alcohols can also be found [56]. Therefore, it remains as a challenge to design a good catalyst with high selectivity towards the desired product, e.g., unsaturated alcohol.…”

Section: Selective Hydrogenation Of α β-Unsaturated Aldehyde Over Hementioning

confidence: 99%

Design of heterogeneous catalysts for selective hydrogenation of cinnamaldehyde and asymmetric hydrogenation of dimethyl itaconate

Zhen¹

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As one of the most important industrial processes, catalytic hydrogenation, including both symmetric and asymmetric hydrogenation have found numerous applications in essential areas, such as energy production, agriculture, pharmaceutical, commodity chemicals and environment protection. In general, heterogeneous catalysts are more preferable than homogeneous catalysts due to their recyclability and a wide range of applicable reaction conditions. In addition to the catalytic activity, the

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Influence of Preparation Modes on Pt–Ni/CNTs Catalysts Used in the Selective Hydrogenation of Cinnamaldehyde to Hydrocinnamaldehyde

Cited by 27 publications

References 35 publications

Selective Hydrogenation of Cinnamaldehyde to Cinnamal Alcohol over Platinum/Graphene Catalysts

Selective Hydrogenation of Cinnamaldehyde to Cinnamal Alcohol over Platinum/Graphene Catalysts

Synthesis of Hydrocinnamaldehyde via Vapor Phase Dehydrogenation of Hydrocinnamyl alcohol over Rice‐Derived MgO‐Supported Copper Catalysts

Design of heterogeneous catalysts for selective hydrogenation of cinnamaldehyde and asymmetric hydrogenation of dimethyl itaconate

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