A Rapid Treatment of Indoor Formaldehyde at a Very Low Concentration in a Photocatalytic Reactor System Combined with a Continuous Adsorption and Desorption Technique

2001 ◽  
Vol 73 (6) ◽  
pp. 601-602 ◽  
Author(s):  
Fumihide Shiraishi ◽  
Yusuke Ohbuchi ◽  
Shunsuke Yamaguchi ◽  
Kenichiro Yamada ◽  
Hisashi Yamauchi ◽  
...  
Keyword(s):  
Reactor System ◽  
Adsorption And Desorption ◽  
Photocatalytic Reactor ◽  
Low Concentration ◽  
Continuous Adsorption ◽  
Rapid Treatment

scholarly journals Effect of Calcination Temperature on Performance of Photocatalytic Reactor System for Seawater Pretreatment

2016 ◽  
Vol 11 (2) ◽  
pp. 230 ◽  
Author(s):  
Weerana Eh Kan ◽  
Jamil Roslan ◽  
Ruzinah Isha
Keyword(s):  
Photocatalytic Activity ◽  
Calcination Temperature ◽  
Energy Demand ◽  
Weight Ratio ◽  
Oxygen Demand ◽  
High Energy ◽  
Reactor System ◽  
Impregnation Method ◽  
Seawater Desalination ◽  
Photocatalytic Reactor

<p>Conservative desalination technology including distillation requires high energy and cost to operate. Hence, pretreatment process can be done prior to desalination to overcome energy demand and cost reduction. Objective of this research is to study the effect of calcination temperature of hybrid catalyst in photocatalytic reactor system in the seawater desalination, i.e. salt removal in the seawater. The catalyst was synthesized via wet impregnation method with 1:1 weight ratio of TiO<sub>2</sub> and activated oil palm fiber ash (Ti:Ash). The catalyst was calcined at different temperature, i.e. 500 <sup>o</sup>C and 800 <sup>o</sup>C. The study was carried out in a one liter Borosilicate photoreactor equipped with mercury light of 365 nanometers for two hours with 400 rpm mixing and catalyst to seawater sample weight ratio of 1:400. The Chemical Oxygen Demand (COD), pH, dissolved oxygen (DO), turbidity and conductivity of the seawater were analyzed prior and after the testing. The fresh and spent catalysts were characterized via X-Ray Diffractogram (XRD and Nitrogen physisorption analysis. The calcination temperature significantly influenced the adsorption behaviour and photocatalytic activity. However, Ti:Ash which calcined at 800 <sup>o</sup>C has less photocatalytic activity. It might be because the surface of fiber ash was sintered after calcined at high temperature. The Ti:Ash catalyst that calcined at 500 <sup>o</sup>C was found to be the most effective catalyst in the desalination of seawater by reducing the salt concentration of more than 9 % compared to Ti:Ash calcined at 800 <sup>o</sup>C. It can be concluded that catalyst calcination at 500 °C has better character, performance and economically feasible catalyst for seawater desalination. Copyright © 2016 BCREC GROUP. All rights reserved</p><p><em>Received: 22<sup>nd</sup> January 2016; Revised: 23<sup>rd</sup> February 2016; Accepted: 23<sup>rd</sup> February 2016</em></p><strong>How to Cite:</strong> Kan, W.E., Roslan, J., Isha R. (2016). Effect of Calcination Temperature on Performance of Photocatalytic Reactor System for Seawater Pretreatment. <em>Bulletin of Chemical Reaction Engineering &amp; Catalysis</em>, 11 (2): 230-237 (doi:10.9767/bcrec.11.2.554.230-237)<p><strong>Permalink/DOI:</strong> http://dx.doi.org/10.9767/bcrec.11.2.554.230-237</p>

scholarly journals Low concentration volatile organic pollutants removal in combined adsorber-desorber-catalytic reactor system

2008 ◽  
Vol 62 (2) ◽  
pp. 51-58
Author(s):  
Zorana Arsenijevic ◽  
Gordan Savcic ◽  
Dragan Rankovic ◽  
Bosko Grbic ◽  
Nenad Radic ◽  
...  
Keyword(s):  
Energy Consumption ◽  
High Efficiency ◽  
Draft Tube ◽  
Physical Adsorption ◽  
Reactor System ◽  
Catalytic Reactor ◽  
Combined System ◽  
Adsorption And Desorption ◽  
Volatile Organic ◽  
Catalytic Incineration

The removal of volatile organic compounds (VOCs) from numerous emission sources is of crucial importance due to more rigorous demands on air quality. Different technologies can be used to treat the VOCs from effluent gases: absorption, physical adsorption, open flame combustion, thermal and catalytic incineration. Their appropriateness for the specific process depends on several factors such as efficiency, energy consumption, secondary pollution, capital investments etc. The distinctive features of the catalytic combustion are high efficiency and selectivity toward be?nign products, low energy consumption and absence of secondary polluti?on. The supported noble catalysts are widely used for catalytic incineration due to their low ignition temperatures and high thermal and chemical stability. In our combined system adsorption and desorption are applied in the spouted bed with draft tube (SBDT) unit. The annular zone, loaded with sorbent, was divided in adsorption and desorption section. Draft tube enabled sorbent recirculation between sections. Combustion of desorbed gases to CO2 and water vapor are realized in additive catalytic reactor. This integrated device provided low concentrations VOCs removal with reduced energy consumption. Experiments were conducted on a pilot unit of 220 m3/h nominal capacity. The sorbent was activated carbon, type K81/B - Trayal Corporation, Krusevac. A sphere shaped commercial Pt/Al2O3 catalyst with "egg-shell" macro-distribution was used for the investigation of xylene deep oxidation. Within this paper the investigations of removal of xylene vapors, a typical pollutant in production of liquid pesticides, in combined adsorber/desorber/catalytic reactor system is presented.

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