The effect of potassium on Cu/Al2O3 catalysts for the hydrogenation of 5-hydroxymethylfurfural to 2,5-bis(hydroxymethyl)furan in a fixed-bed reactor

2018 ◽  
Vol 8 (23) ◽  
pp. 6091-6099 ◽  
Author(s):  
Danxin Hu ◽  
Hualei Hu ◽  
Hao Zhou ◽  
Guozheng Li ◽  
Chunlin Chen ◽  
...  
Keyword(s):  
Selective Hydrogenation ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Highly Efficient

The highly efficient selective hydrogenation of 5-hydroxymethylfurfural (HMF) to 2,5-bis(hydroxymethyl)furan (BHMF) was achieved in a fixed-bed reactor by using inexpensive potassium-doped Cu/Al2O3 catalysts.

Single atom dispersed Rh-biphephos&PPh3@porous organic copolymers: highly efficient catalysts for continuous fixed-bed hydroformylation of propene

2016 ◽  
Vol 18 (10) ◽  
pp. 2995-3005 ◽  
Author(s):  
Cunyao Li ◽  
Li Yan ◽  
Lanlu Lu ◽  
Kai Xiong ◽  
Wenlong Wang ◽  
...  
Keyword(s):  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Single Atom ◽  
Highly Efficient

The hydroformylation of propene to linear-butaldehyde can be performed efficiently in a continuous fixed-bed reactor employing the copolymer self-supported heterogeneous Rh/CPOL-bp&P catalysts.

Selective Hydrogenation of Acetylene to Ethylene Over Nanosized Gold and Palladium Supported Catalysts

2020 ◽  
Vol 20 (9) ◽  
pp. 5800-5803 ◽  
Author(s):  
Gyeongmin Lee ◽  
Woon-Jo Jeong ◽  
Ho-Geun Ahn
Keyword(s):  
Selective Hydrogenation ◽  
Supported Catalysts ◽  
Fixed Bed ◽  
Raw Material ◽  
Fixed Bed Reactor ◽  
Selective Hydrogenation Of Acetylene ◽  
Metal Support Interaction ◽  
Metal Support ◽  
Polyethylene Production ◽  
Ethylene Selectivity

Ethylene, the main raw material for polyethylene production, is a by-product produced by thermally decomposing naphtha and it contains a small amount of acetylene. The acetylene reacts as a permanent catalyst poison for the ethylene polymerization catalyst. In this study, we wanted to improve the acetylene conversion and the ethylene selectivity by selective hydrogenation of acetylene for removing acetylene contained in ethylene. Catalyst was prepared by loading nanosized gold (Au) and palladium (Pd) particles on support (Al2O3, TiO2). Deposition order Au and Pd particles was changed. The activity of the catalyst was investigated using a flow-typed fixed bed reactor under atmospheric pressure. Au and Pd particles deposited on TiO2 were oxidized to Au2O3 and PdO due to strong metal support interaction (SMSI). It was considered that the Au/Pd/Al2O3 catalyst was more active than the Pd/Au/Al2O3 catalyst due to the formation of the interface between Au particles and Pd particles (or support). But Pd/Au/Al2O3 catalyst is considered to have poor activity because Pd particles cover part of the interface between Au and the support. Au/Pd/Al2O3 catalyst showed the best catalytic activity, and acetylene conversion and ethylene selectivity were 100% and about 80% at 40 °C, respectively.

Cu–Mg–Zr/SiO2 catalyst for the selective hydrogenation of ethylene carbonate to methanol and ethylene glycol

2018 ◽  
Vol 8 (10) ◽  
pp. 2624-2635 ◽  
Author(s):  
Jingxia Tian ◽  
Wei Chen ◽  
Peng Wu ◽  
Zhirong Zhu ◽  
Xiaohong Li
Keyword(s):  
Ethylene Glycol ◽  
Selective Hydrogenation ◽  
Ethylene Carbonate ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Precipitation Method ◽  
Metal Loading ◽  
Total Metal ◽  
Hydrogenation Of Ethylene

A Cux–Mgy–Zrz/SiO2 catalyst with a total metal loading of 60 wt% prepared by a deposition–precipitation method was applied for the selective hydrogenation of ethylene carbonate to methanol and ethylene glycol in a fixed-bed reactor.

Role of filter media in an anaerobic fixed-bed reactor

1995 ◽  
Vol 31 (9) ◽  
pp. 137-144 ◽  
Author(s):  
T. Miyahara ◽  
M. Takano ◽  
T. Noike
Keyword(s):  
Anaerobic Bacteria ◽  
Fixed Bed ◽  
Methanogenic Bacteria ◽  
The Other ◽  
Fixed Bed Reactor ◽  
Filter Media ◽  
Fixed Bed Reactors ◽  
Attached Bacteria ◽  
The Relationship

The relationship between the filter media and the behaviour of anaerobic bacteria was studied using anaerobic fixed-bed reactors. At an HRT of 48 hours, the number of suspended acidogenic bacteria was higher than those attached to the filter media. On the other hand, the number of attached methanogenic bacteria was more than ten times as higher than that of suspended ones. The numbers of suspended and deposited acidogenic and methanogenic bacteria in the reactor operated at an HRT of 3 hours were almost the same as those in the reactor operated at an HRT of 48 hours. Accumulation of attached bacteria was promoted by decreasing the HRT of the reactor. The number of acidogenic bacteria in the reactor packed sparsely with the filter media was higher than that in the closely packed reactor. The number of methanogenic bacteria in the sparsely packed reactor was lower than that in the closely packed reactor.

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