Solar photocatalytic reactor performance for hydrogen production from incident ultraviolet radiation

2011 ◽  
Vol 36 (16) ◽  
pp. 9446-9452 ◽  
Author(s):  
E. Oralli ◽  
I. Dincer ◽  
G.F. Naterer
Keyword(s):  
Hydrogen Production ◽  
Ultraviolet Radiation ◽  
Reactor Performance ◽  
Photocatalytic Reactor

scholarly journals Numerical modelling of a three-phase internal air-lift circulating photocatalytic reactor

2017 ◽  
Vol 76 (11) ◽  
pp. 3044-3053 ◽  
Author(s):  
Minghan Luo ◽  
Qiuwen Chen ◽  
Taeseop Jeong ◽  
Jing Chen
Keyword(s):  
Low Cost ◽  
Scale Up ◽  
Influential Factors ◽  
Phase Flow ◽  
Reactor Performance ◽  
Water And Wastewater Treatment ◽  
Photocatalytic Reactor ◽  
Three Phase ◽  
Three Phase Flow ◽  
Air Lift

Abstract The photocatalytic degradation process has been recognized as a low-cost, environmentally friendly and sustainable technology for water and wastewater treatment. As a key carrier of the photocatalytic process, the semiconductor TiO2 has been used in many studies. Analysis and modelling of hydrodynamics in the three-phase flow system can provide useful information for process design, operation and optimization of the three-phase flow photocatalytic reactor, which requires research on the mixing and flow characteristics of the interphase regions in the reactor. In this study, we modelled the hydrodynamics in an internal air-lift circulating photocatalytic reactor using an Eulerian multi-fluid approach. Localized information on phase holdup, fluid flow patterns and mixing characteristics was obtained. The simulation results revealed that the distribution of solid particle concentration depends on the flow field in the internal air-lift circulating photocatalytic reactor. The distance between the draft tube and wall of the reactor and changes in the superficial gas velocity (Ug) were found to be influential factors in reactor performance. The computational model developed could support optimizing reactor design to improve the hydrodynamics and provide guidance for scale-up.

Microbial community composition and reactor performance during hydrogen production in a UASB reactor fed with raw cheese whey inoculated with compost

2011 ◽  
Vol 64 (11) ◽  
pp. 2265-2273 ◽  
Author(s):  
E. Castelló ◽  
V. Perna ◽  
J. Wenzel ◽  
L. Borzacconi ◽  
C. Etchebehere
Keyword(s):  
Microbial Community ◽  
Hydrogen Production ◽  
Cheese Whey ◽  
Microbial Community Composition ◽  
Uasb Reactor ◽  
Hydrogen Yield ◽  
Reactor Performance ◽  
Loading Rates ◽  
Streptococcus A ◽  
Selection Of

This study investigated the microbial community developed in a UASB reactor for hydrogen production and correlated it to reactor performance. The reactor was inoculated with kitchen waste compost and fed with raw cheese whey at two organic loading rates, 20 gCOD/Ld and 30 gCOD/Ld. Hydrogen production was very variable, using an OLR of 30 gCOD/Ld averaged 1.0 LH2/Ld with no methane produced under these conditions. The hydrogen yield was also very variable and far from the theoretical. This low yield could be explained by selection of a mixed fermentative population with presence of hydrogen producing organisms (Clostridium, Ruminococcus and Enterobacter) and other non-hydrogen producing fermenters (Lactobacillus, Dialister and Prevotella). The molecular analysis of the raw cheese whey used for feeding revealed the presence of three predominant organisms that are affiliated with the genera Buttiauxella (a low-yield hydrogen producer) and Streptococcus (a lactic acid-producing fermenter). Although these organisms did not persist in the reactor, the continuous addition of these fermenters could decrease the reactor's hydrogen yield.

Improvement of membrane reactor performance in hydrogen production

Desalination ◽  
2006 ◽  
Vol 200 (1-3) ◽  
pp. 695-696 ◽  
Author(s):  
Giovanni Chiappetta ◽  
Gabriele Clarizia ◽  
Enrico Drioli
Keyword(s):  
Hydrogen Production ◽  
Membrane Reactor ◽  
Reactor Performance

Hydrogen Production for Fuel Cells by a Methane Reformer Integrated with Steam Generation

2012 ◽  
Vol 10 (1) ◽  
Author(s):  
Donglai Xie ◽  
Ang Peng ◽  
Ziliang Wang ◽  
Yajun Zhang
Keyword(s):  
Hydrogen Production ◽  
Natural Gas ◽  
Steam Reforming ◽  
Space Velocity ◽  
Processing Unit ◽  
Reactor Performance ◽  
Steam Generation ◽  
Fuel Processing ◽  
Oxidative Reforming ◽  
Oxidation Reactor

The fuel cell based heat and power co-generation is considered to be well qualified for a distributed energy system for residential and small commercial applications. A kW-scale system is under development in the New Energy Group in South China University of Technology. Natural gas is selected as fuel for hydrogen production. The system mainly consists of a fuel processing unit, a power generation unit and an auxiliary unit. The fuel processing unit includes a reformer (integrated with steam generation), two high and low temperature shift reactors, and a preferential oxidation reactor. The reformer integrated with steam generation is designed to produce hydrogen-rich syngas from natural gas and water. It can be operated under steam methane reforming or oxidative steam reforming modes. 800 grams of commercial nickel catalyst supported on gamma alumina are loaded in the reformer. The reactor performances under typical steam reforming and oxidative reforming modes are tested. Influences of reaction temperature, steam-to-carbon ratio and methane space velocity on reactor performance under steam reforming mode are experimentally investigated. Influences of oxygen-to-carbon ratio, steam-to-carbon ratio and methane space velocity on reactor performance under oxidative reforming mode are also studied. The reformer will be integrated with the other parts of the system to build a complete system.

scholarly journals Preparation ofNaTaO3by Spray Pyrolysis and Evaluation of Apparent Photocatalytic Activity for Hydrogen Production from Water

2008 ◽  
Vol 2008 ◽  
pp. 1-8 ◽  
Author(s):  
Hyun Woo Kang ◽  
Eun-Jung Kim ◽  
Seung Bin Park
Keyword(s):  
Photocatalytic Activity ◽  
Quantum Yield ◽  
Hydrogen Production ◽  
Spray Pyrolysis ◽  
Uv Light ◽  
Precursor Solution ◽  
Photocatalytic Reactor ◽  
Photocatalytic Activities ◽  
Uv Lamp ◽  
Spray Pyrolysis Process

NaTaO3photocatalyst was prepared by spray pyrolysis process and tested as photocatalyst for water splitting under UV light. Precursor solution was prepared fromNaNO3andTa(OC2H5)5in nitric acid solution and spray-pyrolyzed in air at between 973 and 1273 K. Considerable enhancement of photocatalytic activity was achieved by loading0.05∼0.2 wt% of NiO on the surface ofNaTaO3. The NiO loading was more effective on theNaTaO3synthesized by spray pyrolysis in comparison with that synthesized by solid-state reaction. The quantum yield (QY) ofNiO/NaTaO3photocatalyst was measured by chemical actinometry using potassium ferrioxalate and compared with the apparent photocatalytic activities (APA) which would be more useful for the purpose of photocatalytic reactor design than the quantum yield. The apparent photocatalytic activity (APA) was defined by the rate of hydrogen production divided by weight of catalyst, volume of reactant mixture, duration of irradiation, and power of UV lamp. The validity of the apparent photocatalytic activity (APA) was discussed based on our results and reported activities ofNaTaO3photocatalyst loaded with or without NiO.

Sign in / Sign up

Export Citation Format

Share Document