Catalyst Activity and Performance of Stability-Limited Fixed-Bed Reactors

1971 ◽  
Vol 10 (4) ◽  
pp. 483-489 ◽  
Author(s):  
K. P. Williams ◽  
J. C. Matthews
Keyword(s):  
Catalyst Activity ◽  
Fixed Bed ◽  
Fixed Bed Reactors ◽  
And Performance

A preliminary study of the influence of alkali-metal promoters on the selectivity and activity of vanadium catalysts in the oxidation of naphthalene

1981 ◽  
Vol 34 (6) ◽  
pp. 1325 ◽  
Author(s):  
NR Foster ◽  
MS Wainwright ◽  
DWB Westerman
Keyword(s):  
Alkali Metal ◽  
Partial Oxidation ◽  
Alkali Metals ◽  
Catalyst Activity ◽  
Fixed Bed ◽  
Oxidation Products ◽  
Metal Sulfate ◽  
Sodium Potassium ◽  
Fixed Bed Reactors ◽  
Preliminary Study

The oxidation of naphthalene over vanadia catalysts promoted by alkali- metal sulfates was studied in the temperature range 400-440°C. The effects of SO3 levels and alkali-metal sulfate promoter type on catalyst activity and selectivity were investigated in laboratory fixed-bed reactors employing integral conversions. ��� The relative promoting abilities of the alkali metals sodium, potassium, rubidium and caesium were investigated with laboratory catalyst preparations. Alkali metals of higher atomic number favoured selectivity to partial oxidation products with an associated loss in overall activity.

Estimation of catalyst activity profiles in fixed bed reactors

1972 ◽  
Vol 27 (2) ◽  
pp. 329-338 ◽  
Author(s):  
G.R. Gavalas ◽  
G.C. Hsu ◽  
J.H. Seinfeld
Keyword(s):  
Catalyst Activity ◽  
Fixed Bed ◽  
Fixed Bed Reactors

scholarly journals HYDROGEN PRODUCTION AND PERFORMANCE OF ANAEROBIC FIXED-BED REACTORS USING THREE SUPPORT ARRANGEMENTS FROM CASSAVA STARCH WASTEWATER

2017 ◽  
Vol 37 (1) ◽  
pp. 160-172 ◽  
Author(s):  
Douglas G. B. Torres ◽  
Shaiane Dal' Maso Lucas ◽  
Cristiane L. Andreani ◽  
Karina Q. de Carvalho ◽  
Silvia R. M. Coelho ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Fixed Bed ◽  
Cassava Starch ◽  
Fixed Bed Reactors ◽  
Starch Wastewater ◽  
And Performance

Estimation of catalyst activity profiles in fixed-bed reactors with decaying catalysts

1993 ◽  
Vol 106 (2) ◽  
pp. 193-199 ◽  
Author(s):  
Ying-Sheng Cheng ◽  
Felipe López-Isunza ◽  
Tharathon Mongkhonsi ◽  
Lester Kershenbaum
Keyword(s):  
Catalyst Activity ◽  
Fixed Bed ◽  
Fixed Bed Reactors

An Evaluation of Variables Affecting the Stability and Performance of Down-Flow Anaerobic Fixed Bed Reactors Treating Piggery Wastewater

2006 ◽  
Vol 27 (1) ◽  
pp. 85-93 ◽  
Author(s):  
E. Sánchez ◽  
R. Borja ◽  
L. Travieso ◽  
A. Martín ◽  
M.F. Colmenarejo ◽  
...  
Keyword(s):  
Fixed Bed ◽  
Piggery Wastewater ◽  
Fixed Bed Reactors ◽  
And Performance ◽  
The Stability

scholarly journals A comprehensive small and pilot-scale fixed-bed reactor approach for testing Fischer–Tropsch catalyst activity and performance on a BTL route

2017 ◽  
Vol 10 ◽  
pp. S2806-S2828 ◽  
Author(s):  
Piyapong Hunpinyo ◽  
Phavanee Narataruksa ◽  
Sabaithip Tungkamani ◽  
Karn Pana-Suppamassadu ◽  
Nuwong Chollacoop ◽  
...  
Keyword(s):  
Catalyst Activity ◽  
Fixed Bed ◽  
Pilot Scale ◽  
Fixed Bed Reactor ◽  
Fischer Tropsch ◽  
And Performance

Tertiary Nitrification Pilot Plants on Parisian Waste Water

1990 ◽  
Vol 22 (1-2) ◽  
pp. 347-352 ◽  
Author(s):  
C. Paffoni ◽  
B. Védry ◽  
M. Gousailles
Keyword(s):  
Waste Water ◽  
Metropolitan Area ◽  
Fixed Bed ◽  
Point Of View ◽  
Operating Conditions ◽  
Research Center ◽  
Daily Output ◽  
Practical Point ◽  
Fixed Bed Reactors

The Paris Metropolitan area, which contains over eight million inhabitants, has a daily output of about 3 M cu.meters of wastewater, the purification of which is achieved by SIAAP (Paris Metropolitan Area Sewage Service) in both Achères and Valenton plants. The carbon pollution is eliminated from over 2 M cu.m/day at Achères. In order to improve the quality of output water, its tertiary nitrification in fixed-bed reactors has been contemplated. The BIOFOR (Degremont) and BIOCARBONE (OTV) processes could be tested in semi-industrial pilot reactors at the CRITER research center of SIAAP. At a reference temperature of 13°C, the removed load is approximately 0.5 kg N NH4/m3.day. From a practical point of view, it may be asserted that in such operating conditions as should be at the Achères plant, one cubic meter of filter can handle the tertiary nitification of one cubic meter of purified water per hour at an effluent temperature of 13°C.

Role of filter media in an anaerobic fixed-bed reactor

1995 ◽  
Vol 31 (9) ◽  
pp. 137-144 ◽  
Author(s):  
T. Miyahara ◽  
M. Takano ◽  
T. Noike
Keyword(s):  
Anaerobic Bacteria ◽  
Fixed Bed ◽  
Methanogenic Bacteria ◽  
The Other ◽  
Fixed Bed Reactor ◽  
Filter Media ◽  
Fixed Bed Reactors ◽  
Attached Bacteria ◽  
The Relationship

The relationship between the filter media and the behaviour of anaerobic bacteria was studied using anaerobic fixed-bed reactors. At an HRT of 48 hours, the number of suspended acidogenic bacteria was higher than those attached to the filter media. On the other hand, the number of attached methanogenic bacteria was more than ten times as higher than that of suspended ones. The numbers of suspended and deposited acidogenic and methanogenic bacteria in the reactor operated at an HRT of 3 hours were almost the same as those in the reactor operated at an HRT of 48 hours. Accumulation of attached bacteria was promoted by decreasing the HRT of the reactor. The number of acidogenic bacteria in the reactor packed sparsely with the filter media was higher than that in the closely packed reactor. The number of methanogenic bacteria in the sparsely packed reactor was lower than that in the closely packed reactor.

Modeling of aerated upflow fixed bed reactors for nitrification

1999 ◽  
Vol 39 (4) ◽  
pp. 85-92 ◽  
Author(s):  
J. Behrendt
Keyword(s):  
Mathematical Model ◽  
Mass Transfer ◽  
Liquid Phase ◽  
Gas Phase ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Bulk Liquid ◽  
Initial Value ◽  
Fixed Bed Reactors ◽  
Number Of Cells

A mathematical model for nitrification in an aerated fixed bed reactor has been developed. This model is based on material balances in the bulk liquid, gas phase and in the biofilm area. The fixed bed is divided into a number of cells according to the reduced remixing behaviour. A fixed bed cell consists of 4 compartments: the support, the gas phase, the bulk liquid phase and the stagnant volume containing the biofilm. In the stagnant volume the biological transmutation of the ammonia is located. The transport phenomena are modelled with mass transfer formulations so that the balances could be formulated as an initial value problem. The results of the simulation and experiments are compared.

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