Simulation of Fluidized Bed Oxygen Permeable Membrane Reactors for Hydrogen Production from Natural Gas

2012 ◽  
Vol 608-609 ◽  
pp. 1467-1471
Author(s):  
Jian Wen Ye ◽  
Dong Lai Xie ◽  
Zhenhua Yang ◽  
Zhiyu Cao
Keyword(s):  
Hydrogen Production ◽  
Natural Gas ◽  
Fluidized Bed ◽  
Hydrogen Concentration ◽  
Methane Conversion ◽  
Membrane Reactor ◽  
Membrane Reactors ◽  
Hydrogen Yield ◽  
Permeable Membrane ◽  
Oxygen Permeable Membrane

Hydrogen is an important chemical commodity. Fluidized bed oxygen permeable membrane reactor is a novel technology for hydrogen production from natural gas reforming. An Aspen model is built for this novel reactor. Influences of reaction pressure, oxygen to carbon ratio, and steam to carbon ratio on the hydrogen concentration in syn-gas, hydrogen yield, and reaction temperature and methane conversion are studied. The results are compared with the ordinary fluidized bed reactor. It shows that the fluidized bed oxygen permeable membrane reactor has a higher methane conversion and a hydrogen yield and a higher hydrogen concentration in the syngas, due to its in-situ oxygen separation from air.

scholarly journals Understanding the Impact of Hydrogen Activation by SrCe0.8Zr0.2O3−δ Perovskite Membrane Material on Direct Non-Oxidative Methane Conversion

2022 ◽  
Vol 9 ◽  
Author(s):  
Sichao Cheng ◽  
Su Cheun Oh ◽  
Mann Sakbodin ◽  
Limei Qiu ◽  
Yuxia Diao ◽  
...  
Keyword(s):  
Methane Conversion ◽  
Membrane Reactor ◽  
Membrane Reactors ◽  
Fixed Bed Reactor ◽  
Perovskite Oxide ◽  
Oxide Material ◽  
Hydrogen Activation ◽  
Permeable Membrane ◽  
The Impact

Direct non-oxidative methane conversion (DNMC) converts methane (CH4) in one step to olefin and aromatic hydrocarbons and hydrogen (H2) co-product. Membrane reactors comprising methane activation catalysts and H2-permeable membranes can enhance methane conversion by in situ H2 removal via Le Chatelier's principle. Rigorous description of H2 kinetic effects on both membrane and catalyst materials in the membrane reactor, however, has been rarely studied. In this work, we report the impact of hydrogen activation by hydrogen-permeable SrCe0.8Zr0.2O3−δ (SCZO) perovskite oxide material on DNMC over an iron/silica catalyst. The SCZO oxide has mixed ionic and electronic conductivity and is capable of H2 activation into protons and electrons for H2 permeation. In the fixed-bed reactor packed with a mixture of SCZO oxide and iron/silica catalyst, stable and high methane conversion and low coke selectivity in DNMC was achieved by co-feeding of H2 in methane stream. The characterizations show that SCZO activates H2 to favor “soft coke” formation on the catalyst. The SCZO could absorb H2in situ to lower its local concentration to mitigate the reverse reaction of DNMC in the tested conditions. The co-existence of H2 co-feed, SCZO oxide, and DNMC catalyst in the present study mimics the conditions of DNMC in the H2-permeable SCZO membrane reactor. The findings in this work offer the mechanistic understanding of and guidance for the design of H2-permeable membrane reactors for DNMC and other alkane dehydrogenation reactions.

scholarly journals Natural Gas to Fuels and Chemicals: Improved Methane Aromatization in an Oxygen-Permeable Membrane Reactor

2013 ◽  
Vol 52 (51) ◽  
pp. 13794-13797 ◽  
Author(s):  
Zhengwen Cao ◽  
Heqing Jiang ◽  
Huixia Luo ◽  
Stefan Baumann ◽  
Wilhelm A. Meulenberg ◽  
...  
Keyword(s):  
Natural Gas ◽  
Membrane Reactor ◽  
Permeable Membrane ◽  
Methane Aromatization ◽  
Fuels And Chemicals ◽  
Oxygen Permeable Membrane

Catalytic reforming of natural gas for hydrogen production in a pilot fluidized-bed membrane reactor: Mapping of operating and feed conditions

2011 ◽  
Vol 36 (17) ◽  
pp. 10727-10736 ◽  
Author(s):  
Andrés Mahecha-Botero ◽  
Tony Boyd ◽  
Ali Gulamhusein ◽  
John R. Grace ◽  
C. Jim Lim ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Natural Gas ◽  
Fluidized Bed ◽  
Membrane Reactor ◽  
Catalytic Reforming

scholarly journals Natural Gas to Fuels and Chemicals: Improved Methane Aromatization in an Oxygen-Permeable Membrane Reactor

2013 ◽  
Vol 125 (51) ◽  
pp. 14039-14042 ◽  
Author(s):  
Zhengwen Cao ◽  
Heqing Jiang ◽  
Huixia Luo ◽  
Stefan Baumann ◽  
Wilhelm A. Meulenberg ◽  
...  
Keyword(s):  
Natural Gas ◽  
Membrane Reactor ◽  
Permeable Membrane ◽  
Methane Aromatization ◽  
Fuels And Chemicals ◽  
Oxygen Permeable Membrane

Novel Membrane Reactor Concepts for Hydrogen Production from Hydrocarbons: A Review

2016 ◽  
Vol 14 (1) ◽  
pp. 1-31 ◽  
Author(s):  
Ningning Lu ◽  
Donglai Xie
Keyword(s):  
Hydrogen Production ◽  
Membrane Reactor ◽  
Fixed Bed ◽  
Membrane Reactors ◽  
Hydrogen Yield ◽  
Micro Channel ◽  
Cold Model ◽  
Separation Processes ◽  
Recent Developments ◽  
Physical Phenomena

AbstractMembrane reactors are attracting increasing attention for ultrapure hydrogen production from fossil fuel, integrating catalytic reaction and separation processes into one single unit thus can realize the removal of hydrogen or introduction of reactant in situ, which removes the thermodynamic bottleneck and improves hydrogen yield and selectivity. In this review, the state-of-the-art concepts for hydrogen production through membrane reactors are introduced, mainly including fixed bed membrane reactors, fluidized bed membrane reactors, and micro-channel membrane reactors, referring higher hydrocarbons as feedstock, such as ethanol, propane, or heptane; novel heating methods, like solar energy realized through molten salt; new modular designs, including panel and tubular configurations; ultra-compact micro-channel designs; carbon dioxide capture with chemical looping; multifuel processors for liquid and/or solid hydrocarbons; etc. Recent developments and commercialization hurdles for each type of membrane reactor are summarized. Modeling the reactor is fundamental to explore complex hydrodynamics in reactor systems, meaningful to investigate the effects of some important operating factors on reactor performances. Researches for reactor modeling are also discussed. Reaction kinetics for hydrocarbons reforming and reactor hydrodynamics are summarized respectively. Cold model is introduced to investigate physical phenomena in reactors.

scholarly journals Hydrogen Production by Fluidized Bed Reactors: A Quantitative Perspective Using the Supervised Machine Learning Approach

J ◽  
2021 ◽  
Vol 4 (3) ◽  
pp. 266-287
Author(s):  
Zheng Lian ◽  
Yixiao Wang ◽  
Xiyue Zhang ◽  
Abubakar Yusuf ◽  
Lord Famiyeh ◽  
...  
Keyword(s):  
Machine Learning ◽  
Hydrogen Production ◽  
Fluidized Bed ◽  
Biomass Gasification ◽  
Supervised Machine Learning ◽  
Fluidized Bed Reactors ◽  
Hydrogen Yield ◽  
Carbon Conversion ◽  
Operational Parameters ◽  
Operational Conditions

The current hydrogen generation technologies, especially biomass gasification using fluidized bed reactors (FBRs), were rigorously reviewed. There are involute operational parameters in a fluidized bed gasifier that determine the anticipated outcomes for hydrogen production purposes. However, limited reviews are present that link these parametric conditions with the corresponding performances based on experimental data collection. Using the constructed artificial neural networks (ANNs) as the supervised machine learning algorithm for data training, the operational parameters from 52 literature reports were utilized to perform both the qualitative and quantitative assessments of the performance, such as the hydrogen yield (HY), hydrogen content (HC) and carbon conversion efficiency (CCE). Seven types of operational parameters, including the steam-to-biomass ratio (SBR), equivalent ratio (ER), temperature, particle size of the feedstock, residence time, lower heating value (LHV) and carbon content (CC), were closely investigated. Six binary parameters have been identified to be statistically significant to the performance parameters (hydrogen yield (HY)), hydrogen content (HC) and carbon conversion efficiency (CCE)) by analysis of variance (ANOVA). The optimal operational conditions derived from the machine leaning were recommended according to the needs of the outcomes. This review may provide helpful insights for researchers to comprehensively consider the operational conditions in order to achieve high hydrogen production using fluidized bed reactors during biomass gasification.

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