monolithic catalysts
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2022 ◽  
Vol 893 ◽  
pp. 162160
Author(s):  
Shujuan Zhan ◽  
Xianen Hu ◽  
Zhencheng Lou ◽  
Jinzhu Zhu ◽  
Ya Xiong ◽  
...  

Catalysts ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 38
Author(s):  
Seung-Hee Ryu ◽  
Cheol Hong Hwang ◽  
Hojin Jeong ◽  
Giyeong Kim ◽  
Sung Il Ahn ◽  
...  

Pt/γ-Al2O3 catalysts coated on honeycomb-shaped stainless STS-444 steel substrates with a γ-Al2O3 intermediate layer were prepared using a conventional washcoating method. The intermediate layer was formed on the substrate surface through oxidation using pack cementation. The monolithic catalysts with the intermediate layer were fabricated for potential applications to pre-turbocharger catalysts, which suffer from severe conditions such as vibrations of the engine and high flow rates of exhaust gas. Adhesive strength tests and simultaneous oxidation reactions of CO and C3H6 were carried out for the Pt/γ-Al2O3 monolithic catalysts with and without the intermediate layer. The catalysts with an intermediate layer showed much stronger adhesion than the catalysts without an intermediate layer. Thus, the formation of a γ-Al2O3 intermediate layer by surface oxidation through pack cementation facilitated a significant enhancement of the catalyst adhesion strength without catalytic performance degradation.


2021 ◽  
Vol 3 ◽  
Author(s):  
Haseeb Ullah Khan Jatoi ◽  
Michael Goepel ◽  
David Poppitz ◽  
Richard Kohns ◽  
Dirk Enke ◽  
...  

Sol-gel-based silica monoliths with hierarchical mesopores/macropores are promising catalyst support and flow reactors. Here, we report the successful preparation of cylindrically shaped Pt-loaded silica monoliths (length: 2 cm, diameter: 0.5 cm) with a variable mean macropore width of 1, 6, 10, or 27 μm at a fixed mean mesopore width of 17 nm. The Pt-loaded monolithic catalysts were housed in a robust cladding made of borosilicate glass for use as a flow reactor. The monolithic reactors exhibit a permeability as high as 2 μm2 with a pressure drop below 9 bars over a flow rate range of 2–20 cm3 min−1 (solvent: water). The aqueous-phase hydrogenation of p-nitrophenol to p-aminophenol with NaBH4 as a reducing agent was used as a test reaction to study the influence of mass transfer on catalytic activity in continuous flow. No influence of flow rate on conversion at a fixed contact time of 2.6 s was observed for monolithic catalysts with mean macropore widths of 1, 10, or 27 µm. As opposed to earlier studies conducted at much lower flow velocities, this strongly indicates the absence of external mass-transfer limitations or stagnant layer formation in the macropores of the monolithic catalysts.


2021 ◽  
pp. 134397
Author(s):  
Kaixuan Fu ◽  
Yun Su ◽  
Lizhe Yang ◽  
Na Ji ◽  
Chunfeng Song ◽  
...  

Fuel ◽  
2021 ◽  
Vol 305 ◽  
pp. 121446
Author(s):  
Chunmei Cao ◽  
Hua Yang ◽  
Jieyu Xiao ◽  
Xingchuan Yang ◽  
Baozeng Ren ◽  
...  

Fuel ◽  
2021 ◽  
pp. 122419
Author(s):  
Eduardo Poggio-Fraccari ◽  
Antonella Abele ◽  
Nicolas Zitta ◽  
Javier Francesconi ◽  
Fernando Mariño

2021 ◽  
Vol 9 ◽  
Author(s):  
Tianshan Xue ◽  
Li Yang

Catalysts for VOCs combustion have been widely studied and zeolite-based materials and have been structured to meet the need of particle use in this field. This review summarized several new trends in zeolite-based catalysts for VOCs catalytic oxidation. Intensive effort has been devoted to the optimization of composition and structure of catalysts, abatement of CVOCs, design of zeolite-based monolithic catalysts and adsorbent/catalyst bi-functional material. The suggestions for further work here presented are put forward based on the collation of recently published papers.


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