Comments on the Paper “Heterogeneous Nucleation of Water Vapor on Monodisperse Ag and NaCl Particles with Diameters between 6 and 18 nm”

Please click here to find the Original Article to which this Letter refers:: http://dx.doi.org/10.1080/02786828508959039     

Letter to the Editor: Reply to the Comments on “Water Solubility of Cloud-Active Aerosols”

Please click here to find the Letter to the Editor to which this Response refers: http://dx.doi.org/10.1080/02786828508959062     

Letter to the Editor :Impressions of ICIS’0 2 and the Future of International Collaboration

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Reply to Comments on “Sodium Hydroxide Anodization of Ti-6AI-4V Adherends”

We appreciate the interest of Clearfield and Davis in our work on Ti-6A1-4V adherends pretreated using sodium hydroxide anodization. The authors call attention to two main points, namely, the value of the O/Ti atomic percent ratio as determined by X-ray photoelectron spectroscopy (XPS) and the relative thickness of the oxide layers as determined by depth profiling with Auger electron spectroscopy (AES).     

Photodegradation of Natural Organic Matter in Water with UV Irradiation at 185 and 254 nm: Importance of Hydrodynamic Conditions on the Decomposition Rate

Abstract

The kinetic investigation of photodegradation of the natural organic matter (NOM) in natural lake water was conducted using two low‐pressure mercury lamps of the same nominal power: a) with suprasil quartz envelope emitting at both wavelengths ?254 nm and 185 nm (hereafter VUV); b) with standard quartz envelope emitting only at 254 nm (hereafter UV). In comparison to the UV process, the addition of 185 nm irradiation (VUV process) increased the degradation rate ten‐fold overall at lower and seventeen‐fold at higher Reynolds numbers, respectively. The hydrodynamic characteristics of the photoreactor are of crucial importance for total energy efficiency for VUV processes.     

Optimizing the synthesis of Ag/γ-Al2O3 for selective reduction of NOx with C3H6: Experiments and modelling

Ag/γ-Al₂O₃ is an effective catalyst for the selective reduction of NOx (SCR) using propylene as a reducing agent. The catalyst performance is greatly influenced by the synthesis procedure. Various methods for synthesis of Ag/γ-Al₂O₃ are analyzed, and their performance is examined via packed bed reactor experiments in this work. An optimal one-pot synthesis method, single-step sol–gel (SSG) synthesis, is explored systematically. The SSG-synthesized catalyst shows better performance than those prepared via wet impregnation. The influence of synthesis conditions, specifically pH, on the textural and morphological properties of the SSG-synthesized Ag/γ-Al₂O₃, and therefore the activity for hydrocarbon-based SCR in a packed-bed reactor, are analyzed using experiments and simulations. The optimized catalyst demonstrates excellent performance (90% NOx conversion) for NOx reduction under nominal operating conditions with a wide activity temperature window (300–600°C). The catalyst shows good time-on-stream performance and is effective at higher inlet oxygen concentrations and space velocities. A global kinetic model, which uses synthesis-pH-dependent parameters, is proposed, and its ability to predict the activities of these catalysts is validated.     

Fischer–Tropsch Synthesis: Studies on the Effect of Support Doping with Si,Mn and Cr on the Selectivity to Alcohols in Ceria Supported Cobalt Catalysts

Mn and Cr doped CeSi mixed oxides were used as supports for Co and tested for CO hydrogenation. Co/CeSi was found to be more active and significantly more selective to n-alcohols/olefins. An increasing selectivity to n-alcohols and decreasing selectivity to olefins as a function of time on stream was also observed, suggesting a trade-off between those two products. Addition of Mn led to similar behavior, although at slightly lower conversions. Addition of Cr, however, considerably suppressed n-alcohol formation, while it kept selectivities to olefins within a 20–30 % range over more than 250 h of testing, indicating either higher alcohol dehydration activity, or that the presence of Cr ions lowered the hydrogenating activity of Co. The present work indicates that enhanced contact area between Co and the reducible support is likely a key factor for enhancing selectivity to alcohols.