Effect of pretreatment conditions on Cu/Zn/Zr-based catalysts for the steam reforming of methanol to H2

Matter, Paul H.; Ozkan, Umit S.

doi:10.1016/j.jcat.2005.07.007

Cited by 85 publications

(46 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Based on previous studies [9,[25][26][27] and the proposed mechanism over Cu/ZnO/Al 2 O 3 catalysts the appearance of hydroxyls, methoxy and formate groups was expected as well as carbon dioxide as gas phase or weakly bonded surface species. One aim of this study was a decision as to whether the reaction occurs mainly via dioxomethylene or via methyl formate by the observation of one of these species on the catalyst surface.…”

Section: Drifts-experimentsmentioning

confidence: 91%

“…One spectrum of a Cu/ZnO/Al 2 O 3 catalyst is given by Peppley et al [9] and another one for a CuO/ZnO/ZrO 2 /Al 2 O 3 catalyst by Breen et al [25]. More detailed studies were published by Matter et al [26] about Cu/ZnO/ZrO 2 samples and, recently, by Vargas et al [27]. All of them reported formate and methoxy groups as the predominant surface species.…”

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

Steam reforming of methanol over copper-containing catalysts: Influence of support material on microkinetics

Frank

Jentoft

Soerijanto

et al. 2007

Journal of Catalysis

175

135

View full text Add to dashboard Cite

Steam reforming of methanol (SRM) was investigated over copper-containing catalysts supported on four different oxides and mixed oxides: Cu/ZnO/Al 2 O 3 , Cu/ZrO 2 /CeO 2 , Cu/SiO 2 and Cu/Cr 2 O 3 /Fe 2 O 3 . After observing slight differences in the way of catalyst aging and experimental exclusion of mass transport limitation effects, a detailed kinetic study was carried out at 493 K. The dependence of the reaction rate on the molar ratio of methanol and water was determined as well as the influence of addition of inert nitrogen and the main reaction products hydrogen and carbon dioxide to the reactant mixture. Although there were remarkable differences in the catalytic activity of the samples, the main mechanistic steps reflected in the rate law appeared to be similar for all catalysts. The reaction rate is mainly determined by the methanol partial pressure, whereas water is not involved in the rate determining step, except over Cu/Cr 2 O 3 /Fe 2 O 3 , where several differences in the chemistry were observed. Hydrogen and carbon dioxide were found to inhibit the reaction. These results were confirmed by a DRIFTS study at 493 K using an equimolar reactant mixture and an excess of 4:1 of water and methanol, respectively. The same surface species could be identified on each catalyst but neither kinetic modelling nor the DRIFTS spectra could give a clear answer if the reaction pathway occurs via a dioxomethylene or a methyl formate species as intermediate. Similar activation energies of SRM confirm the assumption, that the surface chemistry of SRM over copper-based systems is independent of the catalyst support material.

show abstract

Section: Drifts-experimentsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 98%

Steam reforming of methanol over copper-containing catalysts: Influence of support material on microkinetics

Frank

Jentoft

Soerijanto

et al. 2007

Journal of Catalysis

175

135

View full text Add to dashboard Cite

show abstract

“…However, green diesel resulted from magnesium soap decarboxylation contains a large amount of olefin compounds (> 18%-mole) [20]. Zinc is known as a hydrogenation catalyst of unsaturated compounds [21] that can promote the formation of iso-alkanes as well [22].…”

Section: Introductionmentioning

confidence: 99%

Catalytic and Thermal Decarboxylation of Mg-Zn Basic Soap to Produce Drop-in Fuel in Diesel Boiling Ranges

Neonufa

Soerawidjaja

Prakoso

2017

J. Eng. Technol. Sci.

View full text Add to dashboard Cite

Abstract. Fatty acid deoxygenation is a method for producing renewable hydrocarbon fuels such as green diesel, jet biofuel and biogasoline. In the present commercial method, deoxygenation is directly applied to vegetable oils through liquid phase hydrotreatment. This method is expensive because it consumes a large amount of hydrogen and requires severe operating conditions. The objective of this study was the production of a diesel-like hydrocarbon fuel that can be considered as drop-in replacement for petroleum-based diesel fuels, by catalytic thermal decarboxylation of Mg-Zn basic soap. In particular, this study investigated the decarboxylation of Mg-Zn basic soap at low temperature and pressure, without external supply of hydrogen. The Mg-Zn basic soap (9/1 mole ratio of Mg/Zn) was derived from palm stearin and decarboxylated at 350 °C and atmospheric pressure for 5 hours. The basic soap effectively decarboxylated, yielding a diesel-like hydrocarbon fuel with a liquid product yield of 62%-weight. The resulting hydrocarbon product is a complex mixture consisting of normal paraffins in the range of carbon chain length C 8 -C 19 , iso-paraffins and various olefin products.

show abstract

“…Copper-based catalysts are known due to their high activity and selectivity in processes such as methanol synthesis, water gas shift reaction, selective catalytic reduction of NO x , oxidative methanol steam reforming (SRM) as well as in SRM [1][2][3][4][5][6][7][8]. They are especially important in the last case in spite of the insufficient stability of the process [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…the Cu (Zn) (Zr)-alumina prepared through the wet impregnation of metal nitrates as well as co-precipitation using a sodium carbonate and then calcination in both cases (in air at 400°C for 4 h) [1,15]. The co-precipitation method of Cu/Zn/Zr/Ga oxides applied citric acid solution and then solid residue was thermally treated [20].…”

Section: Introductionmentioning

confidence: 99%

Catalytic characteristics of a copper–alumina nanocomposite formed by the mechanochemical route

Rakoczy

Nizioł

Wieczorek-Ciurowa

et al. 2012

Reac Kinet Mech Cat

View full text Add to dashboard Cite

Mechanochemical synthesis has been successfully employed to prepare Cu 0 -Al 2 O 3 composite powders. The formation of the designed compound is due to the self-propagating reaction of CuO and Al 0 powders by high-energy ball milling using a planetary ball mill (Pulverissette 6, Fritsch GmbH). The products were characterized by means of nitrogen adsorption (BET surface area), X-ray diffraction, scanning electron microscopy and temperature-programmed reduction of hydrogen. The catalytic properties of the prepared materials were tested in the methanol steam reforming (SRM) process. The results show that the Cu 0 -Al 2 O 3 system is active towards hydrogen in SRM. Hydrogen yields are satisfactory; however, methanol conversion to CO as a by-product is observed.

show abstract

Effect of pretreatment conditions on Cu/Zn/Zr-based catalysts for the steam reforming of methanol to H2

Cited by 85 publications

References 42 publications

Steam reforming of methanol over copper-containing catalysts: Influence of support material on microkinetics

Steam reforming of methanol over copper-containing catalysts: Influence of support material on microkinetics

Catalytic and Thermal Decarboxylation of Mg-Zn Basic Soap to Produce Drop-in Fuel in Diesel Boiling Ranges

Catalytic characteristics of a copper–alumina nanocomposite formed by the mechanochemical route

Contact Info

Product

Resources

About