Influence of porous characteristics of the carbon support on alkali-modified trimetallic Co–Rh–Mo sulfided catalysts for higher alcohols synthesis from synthesis gas

Surisetty, Venkateswara Rao; Dalai, Ajay K.; Koziński, Janusz A.

doi:10.1016/j.apcata.2010.11.026

Cited by 50 publications

(27 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…25 Computation of the CO conversion was done for the catalysts following the attainment of stable catalytic activity, typically, after 18 h time-on-stream. 7,11,21 As shown in Figure 8, CO conversion recorded for all the carbon-supported KCoRhMo catalysts increased as a function of temperature. It can be seen that increasing temperature from 330 to 340°C resulted in marginal increments in CO conversion.…”

Section: Catalytic Performance Tests Of Omc-supported Kcomorhmentioning

confidence: 98%

“…This was achieved by subjecting catalysts to an initial sulfidation/reduction step using a sulfiding gas mixture of 10%H 2 S/H 2 molar compositions. 7,11,21 With the intended metals loading maintained constant for all four catalyst formulations, the influence of the different carbon (CNH, OCP f , and OCP) catalyst supports on the higher alcohols productivity was investigated.…”

Section: Alcohol Products Distribution For Cnh Ocp F and Ocpsupported mentioning

confidence: 99%

“…A study conducted by Iranmahboob et al 10 concluded that linear alcohols were mainly observed on the AC-supported K 2 CO 3 /CoS/MoS 2 catalyst for syngas conversion to alcohols. 10 Also, Surisetty et al 11 reported a space time yield and total alcohols selectivity of 0.296 g/(g of cat./h) and 35.6%, respectively, for their trimetallic K-Co-Rh-Mo/MWCNT catalyst compared to the AC-supported counterpart at similar metal loadings. 11 Furthermore, in our previous investigation of largepore ordered mesoporous carbon (OMC)-supported KCoRhMo catalyst and their application for the HAS reaction, it was observed that though the products selectivities was fairly comparable to its MWCNT counterpart at similar metal loadings, XRD analysis of the former catalysts evidenced better homogeneous species dispersion on former support.…”

Section: Introductionmentioning

confidence: 99%

“…10 Also, Surisetty et al 11 reported a space time yield and total alcohols selectivity of 0.296 g/(g of cat./h) and 35.6%, respectively, for their trimetallic K-Co-Rh-Mo/MWCNT catalyst compared to the AC-supported counterpart at similar metal loadings. 11 Furthermore, in our previous investigation of largepore ordered mesoporous carbon (OMC)-supported KCoRhMo catalyst and their application for the HAS reaction, it was observed that though the products selectivities was fairly comparable to its MWCNT counterpart at similar metal loadings, XRD analysis of the former catalysts evidenced better homogeneous species dispersion on former support. This observation was attributed to the enhanced textural properties of the OMC-supported catalyst, which exhibited comparative catalytic performance as its MWCNT counterpart at higher metal loadings.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Syngas Conversion to Higher Alcohols: Application of novel K-Promoted CoRhMo Catalysts Supported over Carbon Nanohorns and its by-Products

Dalai¹

2017

IPCSE

View full text Add to dashboard Cite

Abbreviations: HA: higher alcohols; FTS: fischer-tropsch synthesis; OCP: other carbon particles; OMC: ordered mesoporous carbon; FTIR: fourier transform infra-red; TEM: transmission emission microscopy IntroductionGasoline blends with up to 10% ethanol (E10) and higher alcohols are commercially available at gasoline pump stations in the USA, Canada, and some parts of Europe. 1 The production of these alcohols (C 2 and C 2+ ) promises immense potential to replace other additives utilized as octane boosters in automotive fuels. Catalytic conversion of synthesis gas (mainly, CO+H 2 ) to higher alcohols (HA) via the Fischer-Tropsch synthesis (FTS) process has received tremendous interest due to the generation of environmentally benign octane boosters and alternative fuels to supplement the diminishing supply of the world's finite fossil fuel reserves. In this regard, beneficial incentives derived from the use of these alcohols as alternative fuels or alternative fuel components in transportation systems directly tackles global climate issues such as the reduction of greenhouse gas emissions, reduction of toxic emissions, and also the improvement of the overall energy efficiency of internal combustion engines.2 Unlike gasoline and diesel fuels, higher alcohols contain oxygen components that allow gasoline-blended fuels to combust more completely; thereby, increasing the combustion efficiency and reducing air pollution, and can also be renewable resource depending on the origin of syngas feedstock (via biomass gasification). To improve selectivity and activity of these alcohol products, the catalyst metals and supports used for this reaction play a vital role. 3In the catalysis of hydrogenation reactions on heterogeneous surfaces, whereby metal precursors dispersed on a porous support act as catalyst, the support plays a crucial role due to the probable hydrogen spillover effect. 4,5 The atomic hydrogen forming as a result of dissociative adsorption on the metal migrates onto the support (hydrogen spillover); making the chemical reaction proceeds not only on the metal surface but also on the support. 5In general terms, the support acts to: a. Stabilize the active species and promoters. b. Promote hydrogen or oxygen donation or exchange.c. Modify the dispersion, reducibility, and electron-donating or accepting effects of metal particles 6 among others.Nevertheless, the nature of surface acidity or basicity of the support can greatly impact the surface chemistry of the final catalysts. For instance, metal oxide supports such as SiO 2 and Al 2 O 3 have the tendency to favour hydrocarbons formation by suppressing the reaction rate of alcohols as a result of accelerated coke deposition. AbstractThe submerged arc discharge in liquid nitrogen technique was used to synthesize carbon nanohorns (CNHs) using 90A and 34V; generating other carbon by-products at the high temperature (>4000K) plasma zone, herein depicted as: "other carbon particles" (OCP) and "other fine carbon particles" (OCP f ). In the present work, a series of ...

show abstract

Section: Catalytic Performance Tests Of Omc-supported Kcomorhmentioning

confidence: 98%

Section: Alcohol Products Distribution For Cnh Ocp F and Ocpsupported mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Syngas Conversion to Higher Alcohols: Application of novel K-Promoted CoRhMo Catalysts Supported over Carbon Nanohorns and its by-Products

Dalai¹

2017

IPCSE

View full text Add to dashboard Cite

show abstract

“…Os materiais estudados foram Pt/C 20%, Pt 80 Ir 20 /C, Pt 80 W 20 /C, Pt 80 Sn 20 /C e Pt 60 Ir 10 Sn 30 /C, utilizando-se como padrão para comparação o catalisador comercial Pt/C 20% E-TEK. A caracterização física foi realizada utilizando Energia dispersiva de raios-X (EDX), Difração de Raios-X (DRX), Microscopia Eletrônica de Transmissão (MET) e Microscopia Eletrônica de varredura de alta esoluç o po e iss o de ca po Field emission electron gun MEV-FEG).…”

Section: Introductionunclassified

Nanomaterials Applied as Electrocatalysts in the Oxidation Reaction of Ethanol

Granja¹,

Silva²,

Rodrigues³

2015

Revista Virtual De Química

View full text Add to dashboard Cite

Abstract:Electrocatalyst containing platinum supported on high surface area carbon Vulcan XC-72 were synthesized by the method of reduction by alcohol and tested in comparison to ethanol oxidation reaction in acidic medium. The materials studied were Pt/C 20%, Pt 80 Ir 20 /C, Pt 80 W 20 /C, Pt 80 Sn 20 /C and Pt 60 Ir 10 Sn 30 /C, using as a standard for comparison the commercial catalyst Pt/C 20% E-TEK. Physical characterization was performed using energy dispersive (EDX), X-ray diffraction (XRD), Transmission Electron Microscopy (TEM) and electron microscopy X-ray scanning by high resolution field emission ("Field emission electron gun ") (FEG-SEM). The EDX analysis showed that the theoretical compositions for synthesis are very close to the experimental values. From the results obtained by X-ray diffraction it was possible to calculate the average crystallite size and the lattice parameter of the samples studied. All materials showed a crystalline structure characteristic of face-centered cubic structure of platinum with the lattice parameter changes as a function of added metal. The analysis of SEM and TEM-EGF provided the particle size and the distribution and dispersion in the carbon support. The electrochemical results showed that the addition of different metals to platinum increased the catalytic activity of the electrocatalyst and among the evaluated materials the ternary one showed the best response under the conditions studied.Keywords: Electrocatalysts; ethanol; nanomaterials; electrooxidation. ResumoEletrocatalisadores contendo platina, suportados em carbono de alta área superficial Vulcan XC-72, foram sintetizados pelo método de redução por álcool e testados frente à reação de oxidação de etanol em meio ácido. Os materiais estudados foram Pt/C 20%, Pt 80 Ir 20 /C, Pt 80 W 20 /C, Pt 80 Sn 20 /C e Pt 60 Ir 10 Sn 30 /C, utilizando-se como padrão para comparação o catalisador comercial Pt/C 20% E-TEK. A caracterização física foi realizada utilizando Energia dispersiva de raios-X (EDX), Difração de Raios-X (DRX), Microscopia Eletrônica de Transmissão (MET) e Microscopia Eletrônica de varredura de alta esoluç o po e iss o de ca po Field emission electron gun MEV-FEG). As análises de EDX mostraram que as composições teóricas para síntese são bem próximas dos valores experimentais. A partir dos resultados obtidos por difração de raios-X foi possível calcular o tamanho médio do cristalito e o parâmetro de rede das amostras estudadas. Todos os materiais apresentaram uma estrutura cristalina característica da estrutura cúbica de face centrada da platina com modificações do parâmetro de rede em função do metal adicionado. As análises de MET e MEV-FEG forneceram o tamanho de partícula bem como a distribuição e dispersão no suporte de carbono. Os resultados eletroquímicos mostraram que a adição de diferentes metais à platina aumentou a atividade catalítica dos eletrocatalisadores e dentre os materiais estudados o ternário mostrou melhor resposta nas condições analisadas.

show abstract

The Function of Hydrotalcite as a Support Material in the Alcohol‐Assisted Catalytic CO₂ Hydrogenation Reaction

Xiao

Webley

et al. 2023

ChemPlusChem

View full text Add to dashboard Cite

The traditional CO2 hydrogenation reaction in gas phase always requires harsh reaction conditions to activate CO2, resulting in huge energy consumption. However, with the assistance of 1‐butanol solvent, catalytic CO2 hydrogenation can be proceeded at a mild condition of 170 °C and 30 bars. To further improve the catalytic performance of the widely studied Cu‐ZnO‐ZrO2 catalyst (CZZ), the catalysts were modified by incorporating hydrotalcite (HTC) as a support material. The addition of HTC significantly improved the copper dispersion and surface area of the catalyst. The performance of CZZ‐HTC catalysts was investigated at varying weight percentages of HTC, and all showed higher space‐time yield of methanol (STYMeOH) compared to the commercial catalyst. Notably, CZZ‐6HTC exhibited the highest methanol selectivity, further highlighting the beneficial role of HTC as a support material.

show abstract

Influence of porous characteristics of the carbon support on alkali-modified trimetallic Co–Rh–Mo sulfided catalysts for higher alcohols synthesis from synthesis gas

Cited by 50 publications

References 29 publications

Syngas Conversion to Higher Alcohols: Application of novel K-Promoted CoRhMo Catalysts Supported over Carbon Nanohorns and its by-Products

Syngas Conversion to Higher Alcohols: Application of novel K-Promoted CoRhMo Catalysts Supported over Carbon Nanohorns and its by-Products

Nanomaterials Applied as Electrocatalysts in the Oxidation Reaction of Ethanol

The Function of Hydrotalcite as a Support Material in the Alcohol‐Assisted Catalytic CO₂ Hydrogenation Reaction

Contact Info

Product

Resources

About

Influence of porous characteristics of the carbon support on alkali-modified trimetallic Co–Rh–Mo sulfided catalysts for higher alcohols synthesis from synthesis gas

Cited by 50 publications

References 29 publications

Syngas Conversion to Higher Alcohols: Application of novel K-Promoted CoRhMo Catalysts Supported over Carbon Nanohorns and its by-Products

Syngas Conversion to Higher Alcohols: Application of novel K-Promoted CoRhMo Catalysts Supported over Carbon Nanohorns and its by-Products

Nanomaterials Applied as Electrocatalysts in the Oxidation Reaction of Ethanol

The Function of Hydrotalcite as a Support Material in the Alcohol‐Assisted Catalytic CO2 Hydrogenation Reaction

Contact Info

Product

Resources

About

The Function of Hydrotalcite as a Support Material in the Alcohol‐Assisted Catalytic CO₂ Hydrogenation Reaction