scholarly journals Kinetics of low-temperature catalytic combustion of ethylene at wet conditions for postharvest storage applications

2021 ◽  
Author(s):  
Natalia Semagina ◽  
Rosanne Tam ◽  
James Sawada
Keyword(s):  
Low Temperature ◽  
Air Conditioning ◽  
Catalytic Combustion ◽  
Batch Reactor ◽  
Packed Bed ◽  
Packed Bed Reactor ◽  
Postharvest Storage ◽  
Ethylene Concentration ◽  
Trace Concentrations ◽  
Kinetics Of

The study addresses the reduction of ethylene levels in postharvest storage applications using a Pd-Zn-Sn/TiO2 catalyst, which is capable of reacting trace concentrations of ethylene at temperatures as low as 278 K and at relative humidity as high as 90%. The rate law is derived from data collected using a constant volume batch reactor and a model for a storage room with associated packed bed reactor is developed. The amount of catalyst required to maintain an ethylene concentration of 0.1 ppmv in a room containing 20 tons of fruit having an ethylene metabolism of 0.1 ul/kg hr was calculated as a function of air temperature and water content. While the catalyst is capable of continuously removing ethylene from saturated, refrigerated air, the amount of catalyst required can be reduced significantly by incorporating conventional air conditioning solutions upstream of the catalyst bed. Such combined systems and their functions are discussed

Application of biofilm kinetics to the sulfur/lime packed bed reactor for autotrophic denitrification of groundwater

1998 ◽  
Vol 37 (9) ◽  
pp. 97-104 ◽  
Author(s):  
Zhishi Wang
Keyword(s):  
Packed Bed ◽  
Physical Characteristics ◽  
Packed Bed Reactor ◽  
Experimental Investigations ◽  
Autotrophic Denitrification ◽  
Kinetics Of

To evaluate the engineering feasibility of autotrophic denitrification, a program of theoretical and experimental investigations of the granular sulfur/lime packed bed autotrophic denitrification system was planned and completed. This program evaluated the stoichiometric, kinetic and physical characteristics of the process. This paper will focus on the results of that project which are concerned with the kinetics of autotrophic denitrification of groundwater.

scholarly journals Kinetics of Catalytic Hydrodesulfurization of Fuel Oil in Trickling Packed Bed Reactor

1970 ◽  
Vol 34 (2) ◽  
pp. 193-197,a1 ◽  
Author(s):  
Yoshikazu Shimizu ◽  
Keiichi Inoue ◽  
Hiroyuki Nishikata ◽  
Yutaka Koenuma ◽  
Yasuhiro Takemura ◽  
...  
Keyword(s):  
Packed Bed ◽  
Fuel Oil ◽  
Packed Bed Reactor ◽  
Kinetics Of

Experimental Study on Catalytic Combustion of Gasoline Vapor

2012 ◽  
Vol 549 ◽  
pp. 432-436 ◽  
Author(s):  
Pei Wen Wang ◽  
Yang Du ◽  
De Wen Zhou ◽  
Jian Jun Liang ◽  
Yi Zhou
Keyword(s):  
Experimental Study ◽  
Catalytic Combustion ◽  
Cost Effective ◽  
Packed Bed ◽  
Packed Bed Reactor ◽  
Inlet Temperature ◽  
Gasoline Vapor ◽  
Environmental Friendly ◽  
Bed Temperature ◽  
Full Conversion

This paper provides the results of an experimental research on the performance of catalytic combustion of gasoline vapor. A packed bed reactor was built to test the effect of inlet temperature and concentration on catalytic combustion of gasoline vapor over Pd/Al2O3. The study shows that catalytic combustion is a cost-effective and environmental friendly method to control this kind of emission. The light-off temperature is quite low and full conversion rate is easy to achieve. Meanwhile, the method of controlling the bed temperature is proposed to avoid sintering if the technology is utilized in larger-scale equipment.

Immobilized Whole Cells as Effective Catalysts for Chiral Alcohol Production

2009 ◽  
Vol 62 (9) ◽  
pp. 1034 ◽  
Author(s):  
Jeck Fei Ng ◽  
Stephan Jaenicke
Keyword(s):  
Flow Reactor ◽  
Batch Reactor ◽  
Enantiomeric Excess ◽  
Lactobacillus Brevis ◽  
Packed Bed ◽  
Alginate Beads ◽  
Packed Bed Reactor ◽  
Process Conditions ◽  
Alcohol Production ◽  
Whole Cells

Recombinant Escherichia coli overexpressing the gene LbADH, which encodes for an alcohol dehydrogenase from Lactobacillus brevis, was successfully transformed and cultured. The cells are able to catalyze the reduction of pro-chiral ketones, e.g. ethyl acetoacetate into R-(–)ethyl hydroxybutyrate (EHB) with high conversion and enantiomeric excess >99%. Immobilizing the whole cells in alginate beads leads to a catalyst with improved stability and ease of handling while maintaining the high activity of the free cells. The whole-cell catalyst was tested in a stirred batch reactor (CSTR) and in a continuously operated packed-bed reactor. An Mg2+ concentration of 2 mM was crucial for maintaining the activity of the biocatalyst. After a partial optimization of the process conditions, a productivity of 1.4 gEHB gwcw–1 h–1 could be maintained in a continuous flow reactor over a prolonged period of time.

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