supported catalyst
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Catalysts ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 83
Author(s):  
Cuiping Yu ◽  
Weilong Wu ◽  
Min Gao ◽  
Yu Liu

Asymmetric catalysis is the preferred method for the synthesis of pure chiral molecules in the fine chemical industry. Cellulose has long been sought as a support in enantioselective catalysis. Dialdehyde cellulose (DAC) is produced by the selective oxidation of cellulose and is used to bind 5,5′-diamino Binap by forming a Schiff base. Here, we report the synthesis of modified cellulose-supported Rh as a novel biomass-supported catalyst and the characterization of its morphology, composition, and thermal stability. DAC-BINAP-Rh was a very effective catalyst in the asymmetric hydrogenation of enamides and could be easily recycled. This work provides a novel supported catalyst that broadens the applications of cellulose in asymmetric catalysis.


2022 ◽  
Vol 3 ◽  
Author(s):  
Emma Aryee ◽  
Ajay Kumar Dalai ◽  
John Adjaye

The by-products collected during the synthesis of carbon nanohorns via the arc discharge synthesis method is comprised of other carbon particles (OCP). At a hydrotreating operating temperature of 370°C, preliminary investigations using a bimetallic catalyst with support originating from the fine fractions of other carbon particles (OCPf) and containing 13 wt% Mo and 2.5 wt% Ni resulted in an HDS and HDN conversion of 78 and 25%, respectively. Variation of metal compositions in catalyst formulation and its impact on hydrotreating activity was therefore considered in this study to enhance the hydrotreating activity of OCPf–supported catalyst, and to determine if the best NiMo/OCPf catalyst achieved from this study could be a viable catalyst for hydrotreating applications. The co-incipient wetness impregnation was used in preparing series of hydrotreating catalysts with Ni and Mo loadings within the range of (2.5–5.0 wt%) and (13–26 wt%) respectively. Overall, the catalyst samples with maximum Ni loading of 5.0 wt% and Mo loadings of either 13 or 19 wt% showed higher dispersion and the ability to form a Type II Ni-Mo-S phase with enhanced activity. The effects of metal compositions on both HDS and HDN activities were correlated with their physicochemical properties.


2022 ◽  
Author(s):  
Junqiang Xu ◽  
Huan Tian ◽  
Kaipeng Chen ◽  
Qiang Zhang ◽  
Yalin Liu ◽  
...  

Controlling nickel particle size and inhibiting coke deposition on the supported catalyst was an enormous challenge. To solve this problem, La-doped nickel-based catalysts using MCM-41 as the support were prepared...


Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3461
Author(s):  
Takashi Tsuji ◽  
Guohai Chen ◽  
Takahiro Morimoto ◽  
Yoshiki Shimizu ◽  
Jaeho Kim ◽  
...  

We present a study quantitatively demonstrating that the method of synthesis (gas phase, fixed bed, non-fixed bed) represents a determining factor in the level of crystallinity in growing single wall carbon nanotubes (SWCNTs). Using far infrared spectroscopy, the “effective length” (associated with the level of crystallinity) was estimated for CNTs grown using various synthetic methods (lab-produced and supplemented by commercially purchased SWCNTs) as a metric for crystallinity (i.e., defect density). Analysis of the observed “effective lengths” showed that the SWCNTs fell into two general groups: long and short (high and low crystallinity) synthesized by gas-phase methods and all other supported catalyst methods, respectively. Importantly, the “long” group exhibited effective lengths in the range of 700–2200 nm, which was greater than double that of the typical values representing the “short” group (110–490 nm). These results highlight the significant difference in crystallinity. We interpret that the difference in the crystallinity stemmed from stress concentration at the nanotube-catalyst interface during the growth process, which originated from various sources of mismatch in growth rates (e.g., vertically aligned array) as well as impact stress from contact with other substrates during fluidization or rotation. These results are consistent with well-accepted belief, but now are demonstrated quantitatively.


Fuel ◽  
2021 ◽  
Vol 306 ◽  
pp. 121599
Author(s):  
Ge Guo ◽  
Dong Chen ◽  
Tauseef Ahmed ◽  
Xiaomeng Dou ◽  
Kun Chen ◽  
...  

2021 ◽  
Vol 224 ◽  
pp. 107032
Author(s):  
Shuxiao Wang ◽  
Jing Gu ◽  
Rui Shan ◽  
Haoran Yuan ◽  
Chen Yong

2021 ◽  
Vol 134 ◽  
pp. 105994
Author(s):  
Maryam Awadh Al-Gharibi ◽  
Htet Htet Kyaw ◽  
Jamal Nasser Al-Sabahi ◽  
Myo Tay Zar Myint ◽  
Zahara Abdallah Al-Sharji ◽  
...  

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