Characterization of sulphided Ni/Mo/alumina hydrotreating catalysts by temperature programmed desorption and reduction

Burch, Robbie; Collins, A.C.

doi:10.1016/s0166-9834(00)84014-2

Cited by 23 publications

(5 citation statements)

References 7 publications

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“…It is well known that bi and trimetallic catalysts often offer properties much superior to single metal catalysts. [20][21][22][23][24] Thus, the goal of the work initiated in this paper is to develop an understanding of the gas phase behavior of three selected bimetallic transition metal systems as a prelude to exploring the potential utility of LF-FSP for producing bimetallic catalysts while coincidentally introducing alumina as a possible support. Another goal of the work reported here is to demonstrate the utility of LF-FSP as a means of systematically producing sets of mixed-metal oxide nanopowders in selected phase space.…”

Section: Introductionmentioning

confidence: 99%

Systematic synthesis of mixed-metal oxides in NiO–Co3O4, NiO–MoO3, and NiO–CuO systems via liquid-feed flame spray pyrolysis

2008

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Section: Introductionmentioning

confidence: 99%

Systematic synthesis of mixed-metal oxides in NiO–Co3O4, NiO–MoO3, and NiO–CuO systems via liquid-feed flame spray pyrolysis

2008

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“…It is accepted that HDS takes place on coordinatively unsaturated sites (CUS) of active metal sulfides over HDS catalysts such as CoMo/Al 2 O 3 – . Many studies have been carried out to correlate HDS activities with the number of CUS by means of temperature-programmed reduction of sulfides or adsorption of probe molecules – . Similarly, CUS will be involved in HYD of unsaturated compounds.…”

Section: Introductionmentioning

confidence: 99%

Effects of Acidic Properties on the Catalytic Performance of CoMo Sulfide Catalysts in Selective Hydrodesulfurization of Gasoline Fractions

et al. 2008

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Improvement of the selectivity of hydrodesulfurization (HDS) to hydrogenation (HYD) of olefins is crucial to produce sulfur-free gasoline (S < 10 ppm) from fluid catalytic-cracked (FCC) gasoline. CoMo/SiO 2 catalyst, which was less acidic than CoMo/Al 2 O 3 catalyst, showed higher HDS/HYD selectivity than CoMo/Al 2 O 3 catalyst under mild reaction conditions, although both HDS and HYD activities were lower for the former catalyst. However, under more severe reaction conditions, HDS/HYD selectivity over CoMo/SiO 2 catalyst decreased to a significantly greater extent than that over CoMo/Al 2 O 3 catalyst. NO adsorption measurements indicated that the formation of coordinatively unsaturated sites (CUS) over CoMo sulfides was more dependent on the reaction severity over the SiO 2 supports. FT-IR data of adsorbed pyridine clearly showed that the strength of Lewis acidity over CUS, in particular, mainly formed under high-temperature conditions, was greater for CoMo/SiO 2 catalyst than for CoMo/Al 2 O 3 catalyst. These results suggest that strong Lewis acid sites over CUS promote a hydrocracking reaction in olefins: however, it is not more disadvantageous than HYD reactions in terms of octane loss. Controlling the Lewis acid properties over CoMo sulfides is effective in selective HDS of FCC gasoline, even when using nonacidic supports.

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“…Peaks corresponding to M–O stretching appeared at 950–1200 cm –1 . Temperature-programmed reduction experiments (Micromeritics Auto Chem 2910) showed a broad, unresolved H 2 uptake profile in the temperature range of 500–1100 K. Burch and Collins , reported that Ni reduces at higher temperatures than Mo but, in Ni–Mo/γ-Al 2 O 3 , most Ni reduced simultaneously with Mo at around 700 K. However, some proportion of Ni did not become reduced until the temperature exceeded 800 K.…”

Section: Methodsmentioning

confidence: 99%

Fourier Transform Infrared Spectroscopic Method for Monitoring Hydroprocessing of Vegetable Oils To Produce Hydrocarbon-Based Biofuel

Satyarthi

Srinivas

2011

Energy Fuels

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A novel Fourier transform infrared spectroscopic method is reported, for the first time, to estimate the conversion of vegetable oil (soybean oil, for example) to hydrocarbon-based biofuel via hydroprocessing. The infrared peak attributed to the carboxyl group (O–CO) is used as a marker to determine the conversion of fatty acid glycerides in soybean oil to hydrocarbons. Unlike the conventional gas chromatographic method, this new method of estimation is fast and requires no derivatization of the sample and predetermination of response factors of each chemical component in vegetable oil/product samples. 1H and 13C nuclear magnetic resonance spectroscopy techniques are also reported to substantiate and confirm the purity and product formation in the hydroprocessing reaction.

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Characterization of sulphided Ni/Mo/alumina hydrotreating catalysts by temperature programmed desorption and reduction

Cited by 23 publications

References 7 publications

Systematic synthesis of mixed-metal oxides in NiO–Co3O4, NiO–MoO3, and NiO–CuO systems via liquid-feed flame spray pyrolysis

Systematic synthesis of mixed-metal oxides in NiO–Co3O4, NiO–MoO3, and NiO–CuO systems via liquid-feed flame spray pyrolysis

Effects of Acidic Properties on the Catalytic Performance of CoMo Sulfide Catalysts in Selective Hydrodesulfurization of Gasoline Fractions

Fourier Transform Infrared Spectroscopic Method for Monitoring Hydroprocessing of Vegetable Oils To Produce Hydrocarbon-Based Biofuel

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