Tailoring of La0.8Ce0.1Ni0.4Ti0.6O3-δ catalyst interlayer via in-situ exsolution for catalytic membrane reactor

2021 ◽  
Author(s):  
Ping Luo ◽  
Zhi Xu ◽  
Qiankun Zheng ◽  
Jinkun Tan ◽  
Zhicheng Zhang ◽  
...  
Keyword(s):  
Membrane Reactor ◽  
Membrane Reactors ◽  
Catalytic Membrane ◽  
Membrane Material ◽  
Catalytic Membrane Reactor ◽  
Permeable Membrane ◽  
A Site ◽  
Catalytic Membrane Reactors ◽  
Perovskite Type

The application of catalytic membrane reactors (CMRs) based on perovskite-type oxygen-permeable membrane has been greatly limited by the instability of membrane material. In this study, A-site deficient perovskite La0.8Ce0.1Ni0.4Ti0.6O3-δ (LCNT)...

Enhanced decomposition of sulfur trioxide in the water-splitting iodine–sulfur process via a catalytic membrane reactor

2016 ◽  
Vol 4 (40) ◽  
pp. 15316-15319 ◽  
Author(s):  
Lie Meng ◽  
Masakoto Kanezashi ◽  
Xin Yu ◽  
Toshinori Tsuru
Keyword(s):  
Water Splitting ◽  
Sulfur Trioxide ◽  
Membrane Reactor ◽  
Molecular Size ◽  
Membrane Reactors ◽  
Catalytic Membrane ◽  
Catalytic Membrane Reactor ◽  
First Report ◽  
Catalytic Membrane Reactors

We achieved an enhanced conversion in SO3 decomposition via catalytic membrane reactors at 600 °C and provided the first report on the molecular size of the SO3 molecule.

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 Modeling of ethylbenzene dehydrogenation in catalytic membrane reactor with porous membrane

2014 ◽  
Vol 2 (1) ◽  
pp. 1-9 ◽  
Author(s):  
E.V. Shelepova ◽  
A.A. Vedyagin ◽  
I.V. Mishakov ◽  
A.S. Noskov
Keyword(s):  
Mathematical Model ◽  
Membrane Reactor ◽  
Ceramic Membrane ◽  
Porous Ceramic ◽  
Porous Membrane ◽  
Membrane Reactors ◽  
Catalytic Membrane ◽  
Catalytic Membrane Reactor ◽  
Membrane Pore ◽  
Ethylbenzene Dehydrogenation

AbstractThe modeling of ethylbenzene dehydrogenation in a catalytic membrane reactor has been carried out for porous membrane by means of two-dimensional, non-isothermal stationary mathematical model. A mathematical model of the catalytic membrane reactor was applied, in order to study the effects of transport properties of the porous membrane on process performance. The performed modeling of the heat and mass transfer processes within the porous membrane, allowed us to estimate the efficiency of its use in membrane reactors, in comparison with a dense membrane (with additional oxidation of the hydrogen in shell side). The use of a porous ceramic membrane was found to cause an increase of the ethylbenzene conversion at 600°C, up to 93 %, while the conversion in the case of conventional reactor was 67%. In this work, we defined the key parameter values of porous membrane (pore diameter and thickness) for ethylbenzene dehydrogenation in catalytic membrane reactor, at which the highest conversion of ethylbenzene and styrene selectivity can be reached.

A Comprehensive Model for Catalytic Membrane Reactor

2006 ◽  
Vol 4 (1) ◽  
Author(s):  
Shashi Kumar ◽  
Sukrit Shankar ◽  
Pushan R. Shah ◽  
Surendra Kumar
Keyword(s):  
Membrane Reactor ◽  
Multicomponent Diffusion ◽  
Membrane Reactors ◽  
Catalytic Dehydrogenation ◽  
Inorganic Membranes ◽  
Comprehensive Model ◽  
Catalytic Membrane ◽  
Analysis And Design ◽  
Tubular Membrane ◽  
Catalytic Membrane Reactors

Catalytic membrane reactors are multifunctional reactors, which provide improved performance over conventional reactors. These are used mainly for conducting hydrogenation/ dehydrogenation reactions, and synthesis of oxyorganic compounds by using inorganic membranes. In this paper, comprehensive model has been developed for a tubular membrane reactor, which is applicable to Pd or Pd alloys membrane, porous inorganic membranes. The model accounts for the reaction on either side, tube or shell, isothermal and adiabatic conditions, reactive and non reactive sweep gas, multicomponent diffusion through gas films on both sides of membrane, and pressure variations. Equations governing the diffusion of gaseous components through stagnant gas film, and membranes have been identified and described. The model has been validated with the experimental results available in literature. By using the developed model catalytic dehydrogenation of ethylbenzene to produce styrene in a tubular membrane reactor have been simulated. Four catalysts available for this reaction have been evaluated for their performance. It is our view that the model may be used to develop general purpose software for the analysis and design of tubular catalytic membrane reactors through numerical simulation.

Improved water dissociation and nitrous oxide decomposition by in situ oxygen removal in perovskite catalytic membrane reactor

2010 ◽  
Vol 156 (3-4) ◽  
pp. 187-190 ◽  
Author(s):  
Heqing Jiang ◽  
Haihui Wang ◽  
Fangyi Liang ◽  
Steffen Werth ◽  
Steffen Schirrmeister ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Membrane Reactor ◽  
Oxygen Removal ◽  
Water Dissociation ◽  
Catalytic Membrane ◽  
Catalytic Membrane Reactor ◽  
Nitrous Oxide Decomposition ◽  
Oxide Decomposition

Mechanical and Structural Stability of Perovskites Membranes in Reducing Environments

2002 ◽  
Vol 752 ◽  
Author(s):  
Nagendra Nagabhushana ◽  
William F. Haslebacher ◽  
Venkat K. Venkataraman ◽  
Sukumar Bandopadhyay
Keyword(s):  
Mechanical Stability ◽  
High Strength ◽  
Air Separation ◽  
Membrane Reactors ◽  
Structure Property ◽  
A Site ◽  
Long Term Behavior ◽  
Catalytic Membrane Reactors ◽  
Perovskite Type

ABSTRACTMixed ionic electronic conducting perovskite type oxides are promising materials for potential use in various applications such as in fuel cells and membranes for air separation. An important issue in the development of the perovskites is the structural, chemical and mechanical stability of these materials at high temperatures and reducing environments (oxygen partial pressure from 0.21 to 10−17 atm) encountered in membrane reactors. SrFeO3 oxides doped with La on the A-site and Cr on the B-site showed high strength at room temperature in air. The strength degrades rapidly with an increase in temperature in air as compared to in N2 and CO2/CO environment. Fracture in the material is characterized by non-equilibrium segregation of elements within the grains. The observations provide valuable structure-property correlation as applicable to the long-term behavior of the material in advanced catalytic membrane reactors.

Dehydrogenation of Ethane and Hydrogenation of Carbon Dioxide in a Catalytic Membrane Reactor Using Copper-Plated LaNi5 as a Membrane Material

2006 ◽  
Vol 4 (1) ◽  
Author(s):  
Yoshimitsu Uemura ◽  
Kazuyuki Morita ◽  
Yoshihiro Ohzuno ◽  
Yasuo Hatate
Keyword(s):  
Carbon Dioxide ◽  
Carbon Monoxide ◽  
Membrane Reactor ◽  
Second Step ◽  
Catalytic Membrane ◽  
Membrane Material ◽  
Catalytic Membrane Reactor ◽  
Separation Membrane ◽  
Reduce Carbon Dioxide ◽  
Hydrogenation Of Carbon Dioxide

A membrane reactor consisting of a reactor and a separation membrane may be suitable to provide hydrogen from hydrocarbon in order to reduce carbon dioxide. In this study, a catalytic membrane reactor, a type of membrane reactor, was designed and tested to prove if both the reactions (dehydrogenation of ethane, and reduction of carbon dioxide to carbon monoxide) occur on each side of the membrane in the reactor as expected. As membrane materials, copper-plated LaNi5 and CaNi5 were chosen. In the first step, lower hydrocarbons including ethane was dehydrogenated at one side of the membrane; another side was swept by an inert gas. In the second step, simultaneous feed of ethane (one side) and carbon dioxide (another side) was tried if both the reactions (dehydrogenation of ethane and reduction of carbon dioxide) occur. Carbon dioxide was reduced to carbon monoxide; ethane was dehydrogenated to give ethene.

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