Interaction of hydrogen with Cu–Zn mixed oxide model methanol synthesis catalyst

Khassin, A. A.; Jobic, H.; Filonenko, Georgy A.; Dokuchits, E. V.; Хасин, А. В.; Minyukova, T. P.; Shtertser, N. V.; Plyasova, L. M.; Yurieva, T. M.

doi:10.1016/j.molcata.2013.03.014

Cited by 20 publications

(8 citation statements)

References 61 publications

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“…To gain insight into the structure of the active catalyst, small angle neutron scattering (SANS) [60,61] and neutron powder diffraction [62][63][64] were utilised and to observe surface species, INS has been used [65,66]. SANS is surprisingly rarely used for catalyst studies, even though supported metal particles are typically in the 2-20 nm range, which is well-suited to SANS.…”

Section: Methanolmentioning

confidence: 99%

Net Zero and Catalysis: How Neutrons Can Help

Parker

Lennon

2021

Physchem

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Net Zero has the aim of achieving equality between the amount of greenhouse gas emissions produced and the amount removed from the atmosphere. There is widespread acceptance that for Net Zero to be achievable, chemistry, and hence catalysis, must play a major role. Most current studies of catalysts and catalysis employ a combination of physical methods, imaging techniques and spectroscopy to provide insight into the catalyst structure and function. One of the methods used is neutron scattering and this is the focus of this Perspective. Here, we show how neutron methods are being used to study reactions and processes that are directly relevant to achieving Net Zero, such as methane reforming, Fischer–Tropsch synthesis, ammonia and methanol production and utilization, bio-mass upgrading, fuel cells and CO2 capture and exploitation. We conclude by describing some other areas that offer opportunities.

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Section: Methanolmentioning

confidence: 99%

Net Zero and Catalysis: How Neutrons Can Help

Parker

Lennon

2021

Physchem

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“…Thus, Cu-based catalysts have a great potential for their use in the hydrogenolysis of esters to alcohols. Especially this applies to bulk CuZn catalysts which are very effective in various applications, in particular in methanol synthesis from syngas [23][24][25][26]. The performance of CuZn catalysts has been also investigated in the hydrogenolysis of different compounds, including glycerol to propane-1,2-diol [27], dimethyl or diethyl succinate to butane-1,4-diol [20], hydrogenation of succinic anhydride [28] and dimethyl adipate to 1,6-hexanediol [21,22,29].…”

Section: Introductionmentioning

confidence: 99%

Understanding of the Key Factors Determining the Activity and Selectivity of CuZn Catalysts in Hydrogenolysis of Alkyl Esters to Alcohols

et al. 2021

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CuZn catalysts are perspective catalysts for esters hydrogenolysis, but more knowledge is needed to optimize their catalytic performance. In this work, we consider the impact of CuZn catalysts composition on their structure, activity, selectivity, and stability in esters hydrogenolysis. Four catalysts with various Cu/Zn ratio were synthesized by a co-precipitation and characterized in as-prepared, calcined, reduced, and spent state by XRF, XRD, N2 physisorption, CO2-TPD, NH3-TPD, and N2O chemisorption. XRD data revealed the effect of the composition on the size of Cu and ZnO particles. The catalytic performance was investigated using an autoclave. All catalysts exhibited high methyl hexanoate conversion about 48–60% after 3 h but their activity and selectivity were found to be dependent on Cu/Zn ratio. The conversion of methyl hexanoate and hexyl hexanoate was compared to explain the observed product selectivity. Moreover, the catalysts stability was investigated in three consecutive reaction cycles and correlated with changes in the size of constituent particles. Moreover, when different esters were tested, a slight decrease in conversion and increase in alcohol selectivity with a growth in molecule size was observed. Obtained results allow making a conclusion about the optimal composition that provides the good performance of CuZn catalysts in ester hydrogenolysis.

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“…The active phase of iron in these catalyst formulations was reported to be FHYD. , However, these catalysts gave maximum yields of olefins and linear alcohols in the F–T product distribution. Recently, Khassin et al have also reported the F–T activity of mixed-metal iron–chromium catalyst with iron in the FHYD phase. , It was observed that the partially hydrated iron–chromium oxides with the FHYD structure exhibited much higher F–T activity compared to the precipitated catalysts with the hematite structure.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, Khassin et al have also reported the F−T activity of mixed-metal iron−chromium catalyst with iron in the FHYD phase. 18,19 It was observed that the partially hydrated iron− chromium oxides with the FHYD structure exhibited much higher F−T activity compared to the precipitated catalysts with the hematite structure.…”

Section: Introductionmentioning

confidence: 99%

Synthetic Doped Amorphous Ferrihydrite for the Fischer–Tropsch Synthesis of Alternative Fuels

Bali

Huggins

et al. 2012

Ind. Eng. Chem. Res.

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Ferrihydrites (FHYDs) with the general formula of FeOOH•nH 2 O are naturally occurring oxyhydroxide minerals found in environments varying from river beds, lakes, and marshes to even living organisms. Here, we report the synthesis of a new kind of synthetic doped amorphous two-line FHYDs containing aluminum and copper, which are not usually known to be found in nature. Transmission electron microscopy carried out on synthetic FHYDs showed them to be amorphous in nature with some nanosized groupings in the form of nanoclusters of about 50−200 nm size without any hint of diffraction fringes associated with crystalline order. The synthetic doped FHYDs exhibit unique properties and have been characterized extensively by magnetic measurements, X-ray diffraction, and electron microscopy as well as by Mossbauer spectroscopic studies. After promotion with potassium, these FHYDs were found to have high activity as catalysts for the Fischer−Tropsch (F−T) conversion of syngas to liquid fuels over a period of ∼100 h in a fixed bed reactor at 265 °C and 100 psig pressures. The comparison of the preliminary 100 h data for the synthetic doped FHYD catalyst with those of a commercial fixed-bed catalyst pretreated under similar conditions suggests somewhat better catalytic activity of the synthetic doped FHYD than that of the commercial fixed-bed catalyst. The F−T oil and wax obtained as products were characterized extensively using gas chromatography, quantitative 13 C NMR, and distortionless enhancement by polarization transfer NMR.

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Interaction of hydrogen with Cu–Zn mixed oxide model methanol synthesis catalyst

Cited by 20 publications

References 61 publications

Net Zero and Catalysis: How Neutrons Can Help

Net Zero and Catalysis: How Neutrons Can Help

Understanding of the Key Factors Determining the Activity and Selectivity of CuZn Catalysts in Hydrogenolysis of Alkyl Esters to Alcohols

Synthetic Doped Amorphous Ferrihydrite for the Fischer–Tropsch Synthesis of Alternative Fuels

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