Results 1 to 10 of about 160,248 (216)

5D operando tomographic diffraction imaging of a catalyst bed. [PDF]

Nat Commun, 2018
AbstractWe report the results from the first 5D tomographic diffraction imaging experiment of a complex Ni–Pd/CeO2–ZrO2/Al2O3 catalyst used for methane reforming. This five-dimensional (three spatial, one scattering and one dimension to denote time/imposed state) approach enabled us to track the chemical evolution of many particles across the catalyst ...
Vamvakeros A, Jacques SDM, Di Michiel M, Matras D, Middelkoop V, Ismagilov IZ, Matus EV, Kuznetsov VV, Drnec J, Senecal P, Beale AM.   +10 more
europepmc   +8 more sources

A CFD Simulation Study of the Effect of Thermal Conductivity of the Catalyst Bed on Fischer-tropsch Synthesis

Chemical Engineering Transactions, 2022
One of the most challenging technical barriers for fixed bed Fischer-Tropsch (FT) reactors is the formation of a hot spot in the catalyst bed because of the tremendous release of reaction heat. Increasing the thermal conductivity of the catalyst bed is a
Jianqi Shen, Xinying Liu
doaj   +1 more source

Effects of Geometrical Parameters of a Two-Sided Catalyst Bed on Flow and Thermal Fields of a Monopropellant Hydrazine Thruster [PDF]

فصلنامه علوم و فناوری فضایی, 2022
In present study, a hydrazine based monopropellant thruster decomposition chamber is simulated numerically. The catalyst bed separated in two sides, the particles size in upstream side is larger than those in downstream side.
Mohammad Reza Salimi
doaj   +1 more source

Hydrogenation of Nitrobenzene in Trickle Bed Reactor over Ni/Sio2 Catalyst

Journal of Engineering, 2023
Trickle bed reactor was used to study the hydrogenation of nitrobenzene over Ni/SiO2 catalyst. The catalyst was prepared using the Highly Dispersed Catalyst (HDC) technique.
Majid I. Abdulwahab
doaj   +1 more source

1D modeling of methanation reactor with circulation (MeRCi) for assessment of reaction characteristics

International Journal of Thermofluids, 2023
For a power-to-gas (PtG) system, methanation has attracted attention to synthesize methane from carbon dioxide and hydrogen. There is a problem that heat generated by the reaction causes thermal degradation of the catalyst.
Kazuhiro Yamamoto, Kohei Sakaguchi
doaj   +1 more source

Reactor Structure for the Decomposition of ADN-Based Monopropellant

Aerospace, 2023
Ammonia dinitramide (ADN)-based liquid monopropellants are considered to be environmentally friendly alternatives to the toxic and carcinogenic hydrazine-based propellants. Hence, Space Solutions Co., Ltd.
Wonjae Yoon, Vikas Khandu Bhosale, Hosung Yoon   +2 more
doaj   +1 more source

Regulating catalyst morphology to boost the stability of Ni–Mo/Al2O3 catalyst for ebullated-bed residue hydrotreating

Green Energy & Environment, 2021
Hydrotreating of vacuum residue by ebullated-bed shows tremendous significance due to more stringent environmental regulations and growing demand for lighter fuels. However, enhancing the catalyst stability still remains as a challenging task.
Huihong Zhu, Zhiwei Mao, Bin Liu, Tao Yang, Xiang Feng, Hao Jin, Chong Peng, Chaohe Yang, Jifeng Wang, Xiangchen Fang   +9 more
doaj   +1 more source

Effects of catalytic bed position on hydrogen production by methane decomposition

Journal of Mechanical Engineering and Sciences, 2018
COx free hydrogen can be produced by thermal decomposition of methane. Such process is carried out in a fixed bed catalytic reactor. Where heterogeneous catalytic reaction occur when methane come in contact with catalyst bed at a temperature range of 650-
Umair Sikander, Suriati Sufian, KuZilati KuShaari, Fai Kait Chong   +3 more
doaj   +1 more source

Computational Fluid Dynamics of Ammonia Synthesis in Axial-Radial Bed Reactor

Energies, 2023
Ammonia synthesis by the Haber–Bosch method is a typical and effective implementation of the chemical process in the large-scale fertiliser industry. Due to the growing demand for fertilisers and food, it is desirable to study this process thoroughly ...
Mariusz Tyrański, Jakub Michał Bujalski, Wojciech Orciuch, Łukasz Makowski   +3 more
doaj   +1 more source

The Effect of Bed Catalyst Design Variation on Catalytic Converter against Exhaust Emission Level of Carbon Monoxide (CO) and Hydrocarbon (HC) in Gasoline Engine

Journal of Mechanical Engineering Science and Technology, 2018
The increasing motor vehicle in Indonesia causes air pollution. Several gases that arise as pollutants are carbon monoxide (CO), hydrocarbon (HC), nitrogen oxides (NOx).
Riky Arianto, Imam Muda Nauri
doaj   +1 more source