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  • 1
    Electronic Resource
    Electronic Resource
    Remarkable solvent effect on the shape-selective oxidation of olefins catalyzed by iron(III) porphyrins (1991)
    s.l. : American Chemical Society
    Inorganic chemistry 30 (1991), S. 2581-2582 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00012a002
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  • 2
    Electronic Resource
    Electronic Resource
    Oxidative coupling of methane over LaCoO3−δ-based mixed oxides (1992)
    Springer
    Catalysis letters 16 (1992), S. 359-371 
    Details
    ISSN: 1572-879X
    Keywords: Oxidative coupling of methane ; perovskites ; XRD ; Mössbauer ; TGA ; lattice oxygen ; LaCoO3 based catalyst
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The catalytic activity of LaCoO3−δ-based mixed oxides for the oxidative coupling of methane has been tested by TPR and cyclic reaction. Characterization has been done by XRD, TGA and Mössbauer spectrometry. It is likely that the perovskite-crystal structure containing hypervalent metal ions has an important role and that unique structural oxygen species in the perovskite contribute to the partial oxidation of methane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00764894
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  • 3
    Electronic Resource
    Electronic Resource
    Preparation and characterization of CaTiO3-based perovskitic oxides as catalysts for partial oxidation of light hydrocarbons (1993)
    Springer
    Catalysis letters 18 (1993), S. 37-48 
    Details
    ISSN: 1572-879X
    Keywords: Perovskites ; oxidative coupling of methane ; XRD ; SEM ; TGA ; BET ; CaTiO3-based catalyst ; sol-gel method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A series of perovskites of the formula Ca1−x Sr x Ti1−y M y O3−δ, M=Fe, Co, Cr or Ni,x = 0−1,y = 0−0.6, has been synthesized by a modified sol-gel method using citrate. Several of these materials were proved to be stable under operating conditions in reducing atmospheres of air and hydrocarbons. An outline of the synthesis procedure is given, together with the results of XRD, SEM, BET, TG, DTA and IR characterization before and after catalytic testing. The solubility of Ni and Cr in this perovskite was very limited, and the solubility of Co decreased abruptly above 1173 K. The solubility range of Ca and Sr on alkaline earth sites is 100%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00769496
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  • 4
    Electronic Resource
    Electronic Resource
    Partial oxidation of methane to synthesis gas over some titanates based perovskite oxides (1993)
    Springer
    Catalysis letters 22 (1993), S. 307-317 
    Details
    ISSN: 1572-879X
    Keywords: Synthesis gas ; methane oxidation ; stability of perovskites ; nickel metal ; cobalt metal
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Ca1−x - x Sr x TiO3-based mixed oxide catalysts containing chromium, iron, cobalt or nickel were prepared and used in the oxidation of methane. The catalyst containing cobalt or nickel showed high activity for the synthesis gas production from methane. In the case of nickel containing catalyst, nickel oxide originally separated from the perovskite structure was easily reduced to nickel metal, which showed synthesis gas production activity. In the case of the cobalt containing catalyst, pretreatment with methane was required for high activity. Reduced metallic cobalt was formed from the perovskite structure, which revealed relatively high selectivity for the oxidative coupling of methane, and afforded synthesis gas production. Both the catalysts also catalyzed carbon dioxide reforming of methane and especially both high activity and selectivity were observed over the nickel containing catalyst.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00807238
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  • 5
    Electronic Resource
    Electronic Resource
    Oxidative coupling of methane over some titanates based perovskite oxides (1994)
    Springer
    Catalysis letters 23 (1994), S. 59-68 
    Details
    ISSN: 1572-879X
    Keywords: Perovskites ; oxidative coupling of methane ; CaTiO3 based catalysts ; sol-gel method ; p-type conductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A series of perovskites of the formula Ca1−xSrxTi1−yMyO3−δ (M = Fe or Co,x = 0–1,y = 0–0.6 for Fe,y = 0–0.5 for Co) were prepared and tested as the catalyst for the oxidative coupling of methane. The catalysts were stable under the reaction conditions. The catalysts of high p-type and oxide ionic conductivity afforded the high selectivity. Some catalysts containing Co on B-sites are thermally unstable and decomposed to metal oxide components at high temperature, giving rise to synthesis gas production.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00812131
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  • 6
    Electronic Resource
    Electronic Resource
    Methanol decomposition to synthesis gas over supported Pd catalysts prepared from synthetic anionic clays (1999)
    Springer
    Catalysis letters 58 (1999), S. 131-140 
    Details
    ISSN: 1572-879X
    Keywords: decomposition of methanol ; synthesis gas ; hydrotalcite ; supported Pd catalyst
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Supported Pd or Rh catalysts were prepared by the solid-phase crystallization method starting from hydrotalcite anionic clay minerals based on [Mg6Al2(OH)16CO 2 2− ]·4H2O as the precursors. The precursors were prepared by a coprecipitation method from the raw materials containing Pd〉2+ and various trivalent metal ions which can replace each site of Mg2+ and Al3+ in the hydrotalcite. Rh3+ was also used for preparing the catalyst as comparison. The precursors were then thermally decomposed and reduced to form supported Pd or Rh catalysts and used for the methanol decomposition to synthesis gas. Among the precursors tested, use of Mg–Cr hydrotalcite containing Pd2+ resulted in the formation of efficient Pd supported catalysts for the production of synthesis gas by selective decomposition of methanol at low temperature. Although Pd2+ cannot well replace the Mg2+ site in the hydrotalcite, the Pd supported catalyst (Pd/Mg–Cr) prepared by the solid-phase crystallization method formed highly dispersed Pd metal particles and showed much higher activity than that prepared by the conventional impregnation method. When the precursor was prepared under mild conditions, more fine particles of Pd metal were formed over the catalyst, resulting in high activity. It is likely that the high activity may be due to the highly dispersed and stable Pd metal particles assisted by the role of Cr as the co-catalyst.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019065530943
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  • 7
    Electronic Resource
    Electronic Resource
    Highly active methanol decomposition catalyst derived from Pd‐hydrotalcite dispersed on mesoporous silica (2000)
    Springer
    Catalysis letters 66 (2000), S. 205-213 
    Details
    ISSN: 1572-879X
    Keywords: palladium ; hydrotalcite ; mesoporous silica ; methanol decomposition ; synthesis gas
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Pd‐hydrotalcite (abbreviated as Pd(HT)) was dispersed on HMS (hexagonal mesoporous silica) by synthesizing Pd(HT) in an HMS suspension, and the resultant product (Pd(HT)/HMS) was used as a catalyst precursor for methanol decomposition to synthesis gas. The IR spectra of Pd(HT)/HMS showed all the bands of Pd(HT) and HMS with little shift, which indicated that Pd(HT) was synthesized in the Pd(HT)/HMS. Pd(HT)/HMS did not show the XRD pattern of Pd(HT) when the mass ratio of Pd(HT) to HMS was from 2/1 to 1/2. This indicated that Pd(HT) was formed in very small particles in the Pd(HT)/HMS after dispersion. Two endothermic peaks of Pd(HT) in the DTA curve shifted to lower temperatures in the Pd(HT)/HMS because the small Pd(HT) particles formed in the Pd(HT)/HMS were easily collapsed by heat treatment. Pd(HT)/HMS was thermally decomposed and reduced to form a supported Pd catalyst (abbreviated Pd(Mg(Al)O)/HMS) for methanol decomposition. Pd(Mg(Al)O)/HMS at 3.6 wt% showed a 52.5% conversion which was much higher than those over 3.6 wt% Pd(Mg(Al)O) (34.7%) and 3.6 wt% Pd/HMS (13.7%) for methanol decomposition at 523 K. The conversions of methanol over Pd(Mg(Al)O) and Pd/HMS increased with the increase in Pd loadings from 3.6 to 15 wt% and decreased when the Pd loadings were over 15 wt%. In contrast, the conversion over Pd(Mg(Al)O)/HMS increased with the increase in Pd loading even when the Pd loading was up to 30%. 30 wt% Pd(Mg(Al)O)/HMS showed a 91.7% conversion which was about twice that over 15 wt% Pd(Mg(Al)O) (47.1%) at 523 K. The Pd(Mg(Al)O)/HMS catalyst showed a larger BET surface area and Pd metal surface area than those of Pd(Mg(Al)O). By characterization using XPS analyses, the metal–support interaction between small Pd and small Mg(Al)O became stronger in the Pd(Mg(Al)O)/HMS catalyst. Large surface area, high Pd dispersion and strong metal–support interaction caused the high catalytic activity for methanol decomposition to synthesis gas over the Pd(Mg(Al)O)/HMS catalyst.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019088732045
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  • 8
    Electronic Resource
    Electronic Resource
    Oxidative dehydrogenation of ethane over some titanates based perovskite oxides (1992)
    Springer
    Catalysis letters 16 (1992), S. 373-387 
    Details
    ISSN: 1572-879X
    Keywords: Perovskites ; oxidative dehydrogenation ; ethane ; titanates based catalysts ; hypervalency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A series of perovskite catalysts have been tested for the oxidative dehydrogenation of ethane. The composition of these catalysts covered CaTi1−x Fe x O3−δ, with 0 ⩽x ⩽ 0.4, SrTi1−x Fe x O3−δ, with 0 ⩽x ⩽ 1.0, as well as mixtures of these. The latter catalysts containing more basic Sr metal showed higher selectivity to ethene than the former catalysts containing Ca. A few catalysts with Co on B-sites in the lattice were tested, but lost their stability above 923 K, resulting in a substantial change in the product selectivity. The perovskites gained activity when Fe was introduced in the lattice to form hypervalent ions (Fe4+) which are believed to play a role in the catalytic activity of these materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00764895
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  • 9
    Electronic Resource
    Electronic Resource
    Oxidative dehydrogenation of ethane over La1−xSrxFeO3−δ perovskite oxides (1996)
    Springer
    Catalysis letters 38 (1996), S. 189-195 
    Details
    ISSN: 1572-879X
    Keywords: perovskite ; La1−xSrxFeO3−δ ; dehydrogenation ; oxidation ; ethane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Catalysts of the composition La1−xSrxFeO3−δ, 0⩽x ⩽1, have been tested for the oxidative dehydrogenation of ethane in the temperature range 300–800°C. The catalyst is active above 400°C, giving a maximum yield of 37% ethylene at 650°C. Above 650°C, synthesis gas was formed together with methane, suggesting that the reforming reaction and thermal cracking of ethane took place. The catalytic data are compared to conductivity measurements on the same material, and a good correlation between the activity and p-type conductivity has been found. In the phase diagram for the system LaFeO3-SrFeO3−δ, a phase separation to two types of (La, Sr)FeO3−δ perovskites was observed in the La/Sr binary composition in the temperature range below 800°C. The phase separation can elucidate the dependency of the catalytic activity on its p-type conductivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00806567
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  • 10
    Electronic Resource
    Electronic Resource
    Synthesis gas production in methane conversion using the P|yttria-stabilized zirconia|Ag electrochemical membrane system (1998)
    Springer
    Catalysis letters 52 (1998), S. 191-197 
    Details
    ISSN: 1572-879X
    Keywords: synthesis gas ; methane conversion ; electrochemical membrane system ; yttria-stabilized zirconia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The electrochemical membrane reactor of YSZ (yttria-stabilized zirconia) solid electrolyte coated with Pd and Ag as anode and cathode, respectively, has been applied to the partial oxidation of methane to synthesis gas (CO + H2). The Pd|YSZ|Ag catalytic system has shown a remarkable activity for CO production at 773 K, and the selectivity to CO was quite high (96.3%) under oxygen pumping condition at 5 mA. The H2 production strongly depended on the oxidation state of the Pd anode surface. Namely, the H2 treatment of the Pd anode at 773 K for 1 h drastically reduced the rate of H2 production, while air treatment enhanced the H2 production rate. From the results of the partial oxidation of CH4 with molecular oxygen, it is considered that the reaction site of the electrochemical oxidation of CH4 to synthesis gas was the Pd–YSZ–gas-phase boundary (triple-phase boundary). In addition, it is found that the oxygen species pumped electrochemically over the Pd surface demonstrated similar activity to adsorbed oxygen over Pd, PdOad, for the selective oxidation of CH4 to CO, when the Pd supported on YSZ was used as a fixed-bed catalyst for CH4 oxidation with the adsorbed oxygen. The difference with respect to the H2 formation between the electrochemical membrane system and the fixed-bed catalyst reactor results from differences in the average particle size of Pd and the way of the oxygen supply to the Pd surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019012629300
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