Acetic Acid Reduction by H2 over Supported Pt Catalysts: A DRIFTS and TPD/TPR Study

Rachmady, W.; Vannice, M. A.

doi:10.1006/jcat.2002.3556

Cited by 142 publications

(112 citation statements)

References 43 publications

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“…Figure 5 show infrared spectra after adsorption of acetic acid on the monometallic and bimetallic catalysts. Four different surface species can be identified-acyl, acetate, adsorbed acetic acid and CO, the detailed assignment of bands can be found in literature [9]. All catalysts show almost the same spectra except that the band at 2,054 cm…”

Section: Driftsmentioning

confidence: 90%

“…Pestman et al [5][6][7] have accomplished a series of experiments to explore the reactions of carboxylic acids on oxides and the products they obtained from acetic acid are acetone and aldehyde. Studies conducted by Rachmady and Vannice indicated that Pt supported on oxides is a promising catalyst for acetic acid hydrogenation and a product distribution of 50 % ethanol, 30 % ethyl acetate and 20 % ethane can be acquired on TiO 2 supported Pt catalyst [8,9].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Sn Addition in Gas Phase Hydrogenation of Acetic Acid on Alumina Supported PtSn Catalysts

Zhang

et al. 2014

Catal Lett

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Alumina supported Pt, Sn and PtSn catalysts were prepared by impregnation and tested in the gas phase hydrogenation of acetic acid, and characterized by N 2 -physisorption, XRD, H 2 -TPR, H 2 -pulse chemisorption, H 2 -TPD, DRIFTS (diffuse reflectance infrared Fourier transform spectroscopy), XPS, electron microscopy techniques (TEM, HRTEM and EDX). Results show that Sn addition to Pt/Al 2 O 3 catalyst can improve the conversion of acetic acid and suppress the production of by-products, as well as enhance the selectivity towards ethanol. The optimization of activity and selectivity can be achieved by changing reaction temperature and pressure. Characterizations indicated that the better performance of PtSn/Al 2 O 3 catalyst is due to the formation of PtSn alloy and Pt-SnO x species.

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Section: Driftsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Effect of Sn Addition in Gas Phase Hydrogenation of Acetic Acid on Alumina Supported PtSn Catalysts

Zhang

et al. 2014

Catal Lett

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“…5 shows IR spectra during ethanol-TPD over Co/␣-Al 2 O 3 and Co/1K/␣-Al 2 O 3 catalysts. Assignment of the adsorbed species was conducted based on the literature [26,[41][42][43][44][45][46][47][48][49][50][51][52]. When ethanol was adsorbed at 323 K, C-H stretching of CH 3 -and -CH 2 -(around 3000 cm −1 ), C-H bending of CH 3 -and -CH 2 -(1450 and 1380 cm −1 ), and C-C-O stretching (1120 and 1070 cm −1 ) vibrations peaks were observed.…”

Section: Temperature-programmed Desorption Of Ethanolmentioning

confidence: 99%

Steam reforming of ethanol over K promoted Co catalyst

Ogo

Shimizu

Nakazawa

et al. 2015

Applied Catalysis A: General

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“…4). Also, a couple of overlapped bands in the 1,500-1,600 cm -1 region showed up, reaching a constant intensity at around 60 s. These signals are assigned to the asymmetric and symmetric stretching modes, m as (COO) and m s (COO), of adsorbed acetate groups [17][18][19]. Concurrently, the intensity of the signals belonging to the stretching (m(OH) = 3,000-3,700 cm -1 ) and bending (d(OH) = 1,600-1,700 cm -1 ) modes of protonated water, diminishes with the appearance of acetic acid.…”

Section: Step-response Transient Study Of Aceticmentioning

confidence: 90%

ATR-FTIR Study of the Decomposition of Acetic Anhydride on Fosfotungstic Wells–Dawson Heteropoly Acid Using Concentration-Modulation Excitation Spectroscopy

et al. 2011

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The decomposition of acetic anhydride in liquid phase on a fosfotungstic Wells-Dawson heteropoly acid (HPA) was investigated by in situ ATR-FTIR spectroscopy. Transient and concentration-modulation excitation spectroscopy (MES) experiments in combination with phase-sensitive detection (PSD) were used to monitor the solid-liquid interface. The MES method is based on the periodic variation of a parameter of the reaction media such as, the reactant concentration. That periodic alteration causes varying infrared signals of the surface adsorbed species that are subsequently demodulated with the PSD methodology. Thus, the separation of the static signals from the changing ones is achieved, and species with different response can be observed in the spectra. Using MES-PSD coupled with ATR-FTIR, acetic anhydride was observed to decompose to acetic acid, acetate and acyl [CH 3 C(O) ? ] species, involving Brønsted acid sites of the HPA catalyst. The CH 3 C(O) ? is a very unstable intermediate species and it is the key intermediate in the FriedelCrafts acylation reactions. Moreover, the acetate groups are spectator species since remain strongly adsorbed on the catalyst surface and do not further react.

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Acetic Acid Reduction by H2 over Supported Pt Catalysts: A DRIFTS and TPD/TPR Study

Cited by 142 publications

References 43 publications

Effect of Sn Addition in Gas Phase Hydrogenation of Acetic Acid on Alumina Supported PtSn Catalysts

Effect of Sn Addition in Gas Phase Hydrogenation of Acetic Acid on Alumina Supported PtSn Catalysts

Steam reforming of ethanol over K promoted Co catalyst

ATR-FTIR Study of the Decomposition of Acetic Anhydride on Fosfotungstic Wells–Dawson Heteropoly Acid Using Concentration-Modulation Excitation Spectroscopy

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