Pd-based membranes performance under hydrocarbon exposure for propane dehydrogenation processes: Experimental and modeling
نویسندگان
چکیده
In this work, a novel Pd–Ag double-skinned (DS-) membrane is used for the first time in conditions typical of propane dehydrogenation (PDH). This presents protective layer on top H2-selective one, which acts as shield against chemical deactivation and mechanical erosion under reaction conditions. While already been proven an efficient barrier fluidized beds, there no validation yet PDH reaction. The DS- performance compared with conventional (C-) alkane/alkene exposure, at 400–500 °C 3 bar, to investigate whether incorporation would be suited H2 separation systems, if coking rate affected. shows permeance 2.28 × 10?6 mol?m?2 s?1?Pa?1 500 ?C 4 bar pressure difference, overcoming PdAg one (1.56x?10?6 mol m?2 s?1?Pa?1). Both membranes present stable flux alkane while occurs exposure alkenes. A model able describe through Pd-based presented fit experimental data predict performance. includes mass transfer limitations retentate corrective inhibition factor account competitive adsorption hydrocarbon species selective layer. results obtained alkene deviates from predictions; can attributed carbon deposition surface layer, further detected DS-membrane by Scanning Electron Microscopy (SEM)/Energy Dispersive X-Ray Analysis (EDX), main deactivation.
منابع مشابه
Theoretical Performance Evaluation of Inorganic (Non Pd-Based) Membranes for Hydrogen Separation
The aim of this work theoretical study is to theoretically investigate a inorganic membrane assisted purifcation process of an H2-rich stream derived from a conventional methanol steam reforming stage. In particular, a black-box model for multicomponent gas mixture purifcation is dev...
متن کاملPractical Techniques for Improving the Performance of Polymeric Membranes and Processes for Protein Separation and Purification
Protein separation and purification technologies play an essential role in various industries including but not limited to pharmaceuticals, dairy as well as the food sector. Accordingly, a wide variety of techniques such as chromatography and electrophoresis has been developed and utilized extensively over the years for this purpose. Despite their widespread acceptance, conventiona...
متن کاملAdvances on High Temperature Pd-Based Membranes and Membrane Reactors for Hydrogen Purifcation and Production
Membrane technology applied in the chemical and energy industry has the potential to overcome many drawbacks of conventional technologies such as the need of large volume plants and large CO2 emissions. Recently, it has been reported that this technology might become more competitive...
متن کاملPyrolysis of propane under vacuum carburizing conditions: An experimental and modeling study
Propane has been pyrolyzed in a flow reactor system at different temperatures ranging from 640 C to 1010 C and at 8 mbar of partial pressure which are typical vacuum carburizing conditions for steel. Nitrogen was used as a carrier gas. The products of pyrolysis were collected and analyzed by gas chromatography. The reactor was numerically simulated by 1D and 2D flow models coupled to a detailed...
متن کاملOrdered mesoporous carbon catalyst for dehydrogenation of propane to propylene.
Metal-free ordered mesoporous carbons were demonstrated to be robust catalysts for direct dehydrogenation of propane to propylene, in the absence of any auxiliary steam, exhibiting high activity and selectivity, as well as long catalytic stability, in comparison with nanostructured carbons.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: International Journal of Hydrogen Energy
سال: 2022
ISSN: ['0360-3199', '1879-3487']
DOI: https://doi.org/10.1016/j.ijhydene.2021.09.252