A Temperature-Programmed-Reduction Study on Alkali-Promoted, Carbon-Supported Molybdenum Catalysts

Feng, Lijuan; Li, Xianguo; Dadyburjor, Dady B.; Kugler, Edwin L.

doi:10.1006/jcat.1999.2744

Cited by 55 publications

(45 citation statements)

References 34 publications

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“…However, the position of the negative peak is basically the same as that in the TPR curves due to the presence of the negative peak in the TPD experiment in the absence of hydrogen as well. These eliminate the possibility of methanation of the carbon as the source of the negative peak [43,44]. Li et al have shown that methanation of the carbon support is not significant during TPR runs [43].…”

Section: Upon Catalyst Characterizationsmentioning

confidence: 94%

“…The thermal conductivity of the gas mixture increases because the thermal conductivity of CO is greater than that of argon. This leads to a negative peak in the TPR or TPD spectrum [38][39][40][41][42][43][44].…”

Section: Upon Catalyst Characterizationsmentioning

confidence: 96%

“…Thus the positive peak is attributed to hydrogen consumption of the oxygen functional groups. The Negative peak was attributed to carbonaceous support [38][39][40][41][42][43][44] and discuss later. Figure 7a from which five positive and one negative hydrogen consumption peaks are observed for the prepared catalyst.…”

Section: Upon Catalyst Characterizationsmentioning

confidence: 97%

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In Situ and Simultaneous Synthesis of a Novel Graphene-Based Catalyst for Deep Hydrodesulfurization of Naphtha

Hajjar

Kazemeini

Rashidi³

et al. 2015

Catal Lett

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In this research, a novel graphene-supported catalyst was prepared through which, a simultaneous chemical exfoliation of graphite and MoS 2 powder performed preparing a new composite species and evaluated for the hydrodesulfurization reaction of naphtha and no sulfidation pretreatment was performed upon the catalyst. Also, the influences of the operating parameters such as temperature, and liquid hourly space velocity on HDS conversion evaluated.Electronic supplementary material The online version of this article (

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Section: Upon Catalyst Characterizationsmentioning

confidence: 94%

Section: Upon Catalyst Characterizationsmentioning

confidence: 96%

See 1 more Smart Citation

In Situ and Simultaneous Synthesis of a Novel Graphene-Based Catalyst for Deep Hydrodesulfurization of Naphtha

Hajjar

Kazemeini

Rashidi³

et al. 2015

Catal Lett

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“…1. An earlier version of the TPR apparatus has been described previously [11]. The current equipment consists of a Hewlett-Packard 5890 gas chromatograph with thermal conductivity detector (TCD) and flame ionization detector (FID) and an external furnace connected to a temperature-program controller (Automated Test Systems, Butler, PA).…”

Section: Temperature-programmed Methodsmentioning

confidence: 99%

Temperature-programmed reduction of metal-contaminated fluid catalytic cracking (FCC) catalysts

Bayraktar¹

2004

Applied Catalysis A: General

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A temperature-programmed reduction study of equilibrium fluid catalytic cracking (FCC) catalysts has shown three hydrogen-consumption peaks associated with contaminanted metals. A low-temperature peak, located near 510 • C, is produced by the reduction of several components in the catalyst. Highly-dispersed vanadium contributes to this peak. A high-temperature peak, located near 800 • C, is produced by reduction of nickel aluminate or nickel silicate compounds. A linear relationship exists between the area of the high-temperature peak and nickel concentration on equilibrium catalysts. An intermediate-temperature peak, located near 690 • C, appears to be related to some form of vanadium compound. The intermediate-temperature peak does not occur on low-vanadium-concentration equilibrium catalysts, but is observed at higher vanadium-contamination levels.The presence of the 690 • C peak was found by deconvoluting hydrogen-consumption data. The existence of this intermediate-temperature peak was proven by external reduction of highly-contaminated equilibrium catalyst at 500 and 700 • C. External reduction at 500 • C removes the low-temperature peak from the temperature-programmed reduction (TPR) spectrum. External reduction at 700 • C removes both the low-temperature and intermediate-temperature peaks from the TPR spectrum. The difference in spectrum between calcined and 700 • C reduced samples shows a clear spectrum with only the low and intermediate-temperature peaks present.

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“…4a, only a main reduction peak at about 887 K with a shoulder at about 756 K is detected. Studied the TPR behavior of Mo/C and K-promoted molybdate catalysts, Feng et al [25] have found that there were two positive reduction peaks which are simply assigned to the reduction of Mo 6? to Mo 4?…”

Section: Lrs Studymentioning

confidence: 98%

Study on Methanethiol Synthesis from H2S-Rich Syngas Over K2MoO4 Catalyst Supported on Electrolessly Ni-Plated SiO2

et al. 2009

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Small amount of Nickel deposited on SiO2 support by electroless plating was verified to have a significant promoting effect on the catalytic performance of the K2MoO4/SiO2 catalyst for methanethiol synthesis from H2S-rich synthesis gas. The addition of Nickel was found to be in favor of the suppression of the CO2 formation. The results of BET, TPR and Raman characterizations for the Ni-modified SiO2 and the catalyst K2MoO4/Ni-SiO2 showed that the surface properties of Ni-modified SiO2 were similar to those of unmodified SiO2 and that no Raman characteristic band specific to NiO from the catalyst K2MoO4/Ni-SiO2 was detected. For oxidic K2MoO4/Ni-SiO2 catalyst lower reduction temperature was measured. For sulfided catalysts, reduced molybdenum oxides and oxysulfides were detected, which was inferred to be closely related to high catalytic activity of the catalyst.GmbH (Germany

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A Temperature-Programmed-Reduction Study on Alkali-Promoted, Carbon-Supported Molybdenum Catalysts

Cited by 55 publications

References 34 publications

In Situ and Simultaneous Synthesis of a Novel Graphene-Based Catalyst for Deep Hydrodesulfurization of Naphtha

In Situ and Simultaneous Synthesis of a Novel Graphene-Based Catalyst for Deep Hydrodesulfurization of Naphtha

Temperature-programmed reduction of metal-contaminated fluid catalytic cracking (FCC) catalysts

Study on Methanethiol Synthesis from H2S-Rich Syngas Over K2MoO4 Catalyst Supported on Electrolessly Ni-Plated SiO2

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