Applied Catalysis A General (APPL CATAL A-GEN)

Publisher: Elsevier

Journal description

Scientific understanding of any catalytic phenomena. Phenomena of relevance to current industrial processes, processes under industrial development or of interest for future commercial applications are particularly welcome. Both heterogeneous and homogeneous catalysis are included. Scientific aspects of preparation, activation, aging, deactivation, rejuvenation, regeneration and start-up transient effects of commercially interesting or representative model catalysts. Scientific methods of characterization of catalysts, especially if they are applicable to industrial catalysts. Chemical engineering aspects relevant to an improved understanding of catalytic phenomena or application to catalysis. Results involving a joint approach by chemical engineering and catalytic science are particularly welcome. New catalytic reactions, catalytic routes and processes of potential practical interest. The journal will accept original letters, research papers and reviews. A News Brief section contains information on new scientific facts related to the application of catalysis (new reactions, catalysts, processes, etc.). It also contains reports on technical perspective of historic developments in catalysis, book reviews and calendar of forthcoming events Applied Catalysis B: Environmental will publish papers covering all aspects of environmental catalysis. Since the scope of Elsevier journals of Applied Catalysis A and B and Journal of Molecular Catalysis are complementary, an appropriate choice for submission to any journal could be borderline, in which case the advice of the editors should be sought.

Current impact factor: 3.67

Impact Factor Rankings

2015 Impact Factor Available summer 2015
2013 / 2014 Impact Factor 3.674
2012 Impact Factor 3.41
2011 Impact Factor 3.903
2010 Impact Factor 3.383
2009 Impact Factor 3.564
2008 Impact Factor 3.19
2007 Impact Factor 3.166
2006 Impact Factor 2.63
2005 Impact Factor 2.728
2004 Impact Factor 2.378
2003 Impact Factor 2.825
2002 Impact Factor 1.915
2001 Impact Factor 2.258
2000 Impact Factor 1.576
1999 Impact Factor 1.557
1998 Impact Factor 1.553
1997 Impact Factor 2.02
1996 Impact Factor 1.774
1995 Impact Factor 1.669
1994 Impact Factor 1.421
1993 Impact Factor 1.071

Impact factor over time

Impact factor
Year

Additional details

5-year impact 3.91
Cited half-life 7.60
Immediacy index 0.51
Eigenfactor 0.04
Article influence 0.93
Website Applied Catalysis A: General website
Other titles Applied catalysis
ISSN 0926-860X
OCLC 38523368
Material type Document, Periodical, Internet resource
Document type Internet Resource, Computer File, Journal / Magazine / Newspaper

Publisher details

Elsevier

  • Pre-print
    • Author can archive a pre-print version
  • Post-print
    • Author can archive a post-print version
  • Conditions
    • Pre-print allowed on any website or open access repository
    • Voluntary deposit by author of authors post-print allowed on authors' personal website, arXiv.org or institutions open scholarly website including Institutional Repository, without embargo, where there is not a policy or mandate
    • Deposit due to Funding Body, Institutional and Governmental policy or mandate only allowed where separate agreement between repository and the publisher exists.
    • Permitted deposit due to Funding Body, Institutional and Governmental policy or mandate, may be required to comply with embargo periods of 12 months to 48 months .
    • Set statement to accompany deposit
    • Published source must be acknowledged
    • Must link to journal home page or articles' DOI
    • Publisher's version/PDF cannot be used
    • Articles in some journals can be made Open Access on payment of additional charge
    • NIH Authors articles will be submitted to PubMed Central after 12 months
    • Publisher last contacted on 18/10/2013
  • Classification
    ​ green

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: Recently, biomass resources have garnered significant attention as sustainable and renewable raw materials for the production of chemicals. Propylene glycol (PG) is a valuable chemical product that can be synthesized from biomass. Herein, the selective transformation of glucose into PG was investigated on a carbon-supported 5 wt% Ru catalyst (5%-Ru/C) combined with solid acid–base catalysts under low hydrogen pressures. The reaction conditions, namely the amount of ZnO, temperature, and hydrogen pressure, were also evaluated. At a hydrogen pressure of 0.4 MPa, a full conversion of glucose and 38% yield of PG were obtained using the ZnO + Ru/C system at 453 K for 20 h, while the yield of PG on Ru/C alone was only 9.3% under the same conditions. Studies on the reaction mechanism indicated that the transformation of glucose into PG consisted of the isomerization of glucose to fructose, retro-aldol reaction of fructose to triose (dihydroxyacetone and glyceraldehyde), dehydration of glyceraldehyde to pyruvaldehyde, and successive hydrogenation of pyruvaldehyde to PG via hydroxyacetone. The ZnO catalyst promoted both the isomerization and retro-aldol reaction steps, and the Ru catalyst promoted the hydrogenation steps. The retro-aldol reaction, which included the cleavage of C3C4 bond in glucose, enabled the selective transformation of glucose into PG under low hydrogen pressures. These findings provide novel insights into the efficient synthesis of PG from glucose, which could be achieved by combining and optimizing the retro-aldol and hydrogenation steps.
    Applied Catalysis A General 08/2015; 502. DOI:10.1016/j.apcata.2015.05.008
  • [Show abstract] [Hide abstract]
    ABSTRACT: Cellulose is the most abundant biomass in nature, and its catalytic conversion to commodity chemical ethylene glycol represents an important advance towards sustainable chemistry. In previous work, we have shown that tungstic acid plays a key role in selective C–C cleavage to form glycolaldehyde and then ethylene glycol. To further enhance the efficiency of tungstic acid, a series of additives were investigated in this work. Among various acid additives, H2SO4 stands out as the most remarkable additive; ethylene glycol yield was enhanced from 32.6% to 52.6% at a H2SO4/H2WO4 molar ratio of 0.03 and a H2WO4/cellulose weight ratio of 0.05, that is, an extremely dilute acid concentration. Weakly acidic sulfates (e.g., CuSO4 and FeSO4) have also been demonstrated to be highly efficient additives to improve the catalytic efficiency of tungstic acid, through promoting the hydrolysis of cellulose.
    Applied Catalysis A General 08/2015; 502. DOI:10.1016/j.apcata.2015.05.038
  • Applied Catalysis A General 07/2015; 502:388. DOI:10.1016/j.apcata.2015.06.031
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    ABSTRACT: Fischer–Tropsch synthesis of low molecular weight (C2C4) olefins is a valuable alternative process for the production of key chemicals from non-petroleum precursors such as a renewable C source like biomass. The influence of the H2 treatment temperature of zirconia-supported iron catalysts on the conversion of synthesis gas has been investigated. The CO conversion rate, based on steady-state, increased with the pretreatment temperature up to a maximum and then decreased at higher temperatures. Moreover, methane selectivity was found to decrease slightly from the lowest H2 treatment temperatures (46%) to the highest ones (34%), while C2C4 and C5+ hydrocarbons followed an opposite trend. Presumably, methane formation takes place at highly active low coordination sites residing at corners and edges, which are more abundant on small iron carbide particles. Lower hydrocarbons are mainly produced at terrace sites that are available and active, quite independent of the iron crystallite size.
    Applied Catalysis A General 06/2015; 499. DOI:10.1016/j.apcata.2015.03.031
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    ABSTRACT: The active intermediates formed on phosphorous-modified MTW zeolites in methanol-to-olefin (MTO) were investigated using electron spin resonance (ESR) spectroscopy. The porous and acidic properties of the modified catalysts were characterized by XRD, SEM, N2 adsorption, o-xylene uptake, and temperature-programmed desorption of ammonia. In addition to the repeated potential restrictions to adsorbed aromatic compounds in its 12 membered-ring, the phosphorous modification on MTW zeolites reduces the number of strong acid sites and limits the close distribution of polymethylbenzenes formed during MTO conversion, facilitating the observation of ESR signals with hyperfine splittings of hexamethylbenzenium radical cations, while the poor resolution of the hyperfine splittings supposed the co-presence of other radical cations. The positive relationship between the conversion of methanol and the spin number of radical cations over the MTW catalysts at the early stage confirms the role of these radical cations as actual active intermediates. The high methyl group substitution of the active intermediate formed on MTW catalysts is responsible for the high yields to C3C6 (above 90%) at 450 °C in MTO conversion.
    Applied Catalysis A General 06/2015; 499. DOI:10.1016/j.apcata.2015.04.011
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    ABSTRACT: The current global tendency is to increase the use of biofuels. This tendency has generated an oversupply of glycerol, which is the primary byproduct that is formed during the production of biodiesel. An alternative use for glycerol is based on chemical transformation to high-added-value derivatives at the industrial and/or energy level. During the decomposition of gaseous glycerol, polymers, alcohols and other oxygenated compounds can be generated with a selectivity that depends on the characteristics of the catalyst used. Accordingly, in this work, the acid and base characteristics of the catalyst support and the nickel in the Ni/La2O3 were investigated, as well as their influence on selectivity toward acetol at 400 °C and syngas at 700 °C. Generally, it was determined that the use of a basic catalyst support favors glycerol dehydration with respect to the formation of acetol. Moreover, it was found that the nickel particles present in the catalyst increased yield gas fraction at high reaction temperatures with a high selectivity to the syngas.
    Applied Catalysis A General 06/2015; 499. DOI:10.1016/j.apcata.2015.03.045
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    ABSTRACT: Turnover frequency (TOF) and turnover number (TON) of such Ziegler-type catalysts based on Ni(acac)2·nН2О (n = 0, 0.5, 3.0) and AlEt3, at different Al/Ni molar ratios, have been determined during their examination as styrene hydrogenation catalysts. It is found that the amount of crystallization water effects on the TOF and TON values of the nickel catalysts and defines their dependence on the Al/Ni ratio. It is shown that optimum concentration of proton-donating compounds ensures high values of TOF and TON. The nature of nickel-containing nanoparticles was determined using high-resolution electron microscopy. The size of the nickel clusters depended on the water content of the nickel precursor. The average particle size increased from 1.2 to 2.3 nm on changing the precursor from Ni(acac)2·0.5Н2О to Ni(acac)2·3Н2О. It was shown that organoaluminum compounds acted as Ni(II) → Ni(0) reducing agents, nanoparticle stabilizers, and hydrogenation activity inhibitors. A nickel nanoparticle model is specified, one which explains the activating role of the proton-donating compounds in combination with the Al/Ni ratio.
    Applied Catalysis A General 06/2015; 499. DOI:10.1016/j.apcata.2015.04.020
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    ABSTRACT: Pulse electroplating technology has been applied in the preparation of Pt/C electrocatalysts for hydrogen fuel cell electrodes for decades. The major challenge remaining unsolved is the aggregation of Pt nanoparticles on the carbon support. This research reports a nanoparticle seeded pulse electroplating method for preparing Pt/C electrocatalysts used for oxygen reduction reaction (ORR). Pt or Pt alloy nanoparticles were pre-deposited onto a carbon support as nuclei, followed by Pt pulse electrodeposition. This new approach is able to overcome Pt particle aggregation issues and improve catalyst performance. The technology can also be used for the preparation of core/shell Pt/C electrodes when non-Pt or Pt alloy nanoparticles are used as seeding materials. Experimental results show that a Pt/C electrode with less than 0.1 mg/cm2 Pt loading density, synthesized based on 3.0 nm Pt nanoparticle seeds, can achieve a higher ORR activity than a commercial electrode with 0.5 mg/cm2 Pt loading. When Pt-Pd-Ru alloy nanoparticles of 2.0 nm average diameter were used as seeding nuclei the prepared Pt/C electrode showed higher ORR performance than the commercial electrode, further reduced Pt loading density. Atomic level STEM analyses showed that numerous free Pt atoms were surrounding Pt nanoparticles, serving as nuclei. The seeding atoms, along with nanoparticles, promote the even growth of Pt particles on carbon support during electroplating. This result is verified by SEM images which indicate that electroplated Pt particles on the carbon surface are uniformly distributed and each particle is loosely packed with Pt nanosized flakes. The flower-like structure, with higher surface areas, enhances mass transfer rates and leads to higher ORR efficiencies. Although a commercial Pt/C electrode was used as a baseline catalyst for comparing prepared electrodes, this exploratory research was based on a rotational disk electrode. Fuel cell testing is needed to confirm the finding.
    Applied Catalysis A General 06/2015; 499. DOI:10.1016/j.apcata.2015.03.043
  • [Show abstract] [Hide abstract]
    ABSTRACT: The activity of four different noble metals (Ag, Au, Pd and Pt) in the liquid phase oxidation of pure glycerol was confronted with the results obtained with a crude glycerol fraction, received from a large-scale biodiesel production plant. The catalysts were characterized by numerous techniques, giving insight into actual metal loading (elemental analysis by ICP and XRF), surface morphology (nitrogen absorption methods—BET and porosity), chemical state of both the support and the metal (XRD and XPS), and, finally, the metal particle size distribution (TEM microscopy). A good dispersion of totally reduced noble metal particles of a nanometric size (an average metal diameters were equal 3.5 nm, 4.2 nm, 4.7 nm and 21.2 nm for respectively Pd, Pt, Au and Ag) was accompanied with a comparable values of total metal loadings on the alumina support (from 0.95 and 0.96 wt.% for Pt and Pd, up to 0.98 and 1.13 wt.% for Au and Ag supported catalysts, respectively). In terms of initial reaction rate, the most active sample was the Au/Al2O3 catalyst, both using pure (12976 mol h−1 molAu−1) or crude glycerol (1230 mol h−1 molAu−1). However, comparison of the selectivities and conversions after 1–2 h shows that the most robust and resistant catalyst – toward the impurities present in crude glycerol – is Pd/Al2O3, with a loss of conversion less than 50% (in respect to analogous reaction using pure glycerol) and almost unchanged high selectivity to glyceric acid (close to 80–90%). Ag/Al2O3 also showed a relatively high resistance to impurities in terms of glycerol conversion, but with a drastic modification of its selectivity. The activity of the two other catalysts was dramatically affected with a conversion divided by ca. 4 and even 10 for the Pt and the Au catalysts, respectively, when using crude glycerol instead of pure glycerol. Finally, the effect of each main impurity (MONG-NM, i.e., matter organic non-glycerol and non-methanol; ash; methanol; sulphur compounds) was independently studied. In any case, the sulphur compounds and MONG-NM were the impurities the most detrimental for the performances of catalysts. Thus, they should be removed in priority from crude glycerol fractions before reaction, while ashes and methanol should not be considered as completely undesirable.
    Applied Catalysis A General 06/2015; 499. DOI:10.1016/j.apcata.2015.04.008