The Role of Ion Exchange Method of Na-ZSM-5 Zeolite and Influence Hydrogenation Components on Properties and Activity of Dewaxing Catalysts

1992 ◽  
Vol 57 (5) ◽  
pp. 969-977 ◽  
Author(s):  
Jolanta R. Grzechowiak ◽  
Aleksandra Masalska ◽  
Tadeusz Romotowski ◽  
Jolanta Komorek
Keyword(s):  
Low Temperature ◽  
Ion Exchange ◽  
Flow Reactor ◽  
Nitrate Solution ◽  
Diesel Oil ◽  
Ni Catalysts ◽  
Exchange Method ◽  
Oil Fraction ◽  
Ion Exchange Method

Hydrocracking of n-hexane and diesel oil fraction over presulfided NiMo, Mo and Ni catalysts has been carried out using a high pressure flow reactor system. The ion-exchanged form of ZSM-5 extrudates (50% alumina binder) was loaded with 2-20 wt.% of metals. The results indicate that, using Ni/H-ZSM-5 zeolite obtained by incorporation of nickel by ion exchange treatment of NH4-ZSM-5 from nickel nitrate solution, it is possible to obtain sufficiently active catalysts for low-temperature hydrocracking process. The catalysts containing Ni-ZSM-5 zeolites (Ni/H-ZSM-5 or Ni/Na-ZSM-5) were superior to catalyst prepared by using P/H-ZSM-5. It was found that nickel was an essential hydrogenation components of low temperature hydrocracking catalysts.

The role of various iron species in Fe-β catalysts with low iron loadings for NH3-SCR

2014 ◽  
Vol 4 (5) ◽  
pp. 1350-1356 ◽  
Author(s):  
Haiyan Liu ◽  
Jun Wang ◽  
Tie Yu ◽  
Shikuan Fan ◽  
Meiqing Shen
Keyword(s):  
Ion Exchange ◽  
Iron Species ◽  
Exchange Method ◽  
Nh3 Scr ◽  
Ion Exchange Method

A series of Fe-β catalysts, containing 0.17–0.52 wt% Fe, were prepared by a liquid ion-exchange method to study the influence of various iron species on NH3-SCR activity.

scholarly journals A novel exchange method to access sulfated molecules

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Jaber A. Alshehri ◽  
Anna Mary Benedetti ◽  
Alan M. Jones
Keyword(s):  
Low Temperature ◽  
Ion Exchange ◽  
Bioactive Molecules ◽  
The Novel ◽  
Exchange Method ◽  
Benzyl Alcohols ◽  
Complementary Methods ◽  
Step Procedure ◽  
Ion Exchange Method ◽  
Increasing Demand

Abstract Organosulfates and sulfamates are important classes of bioactive molecules but due to their polar nature, they are both difficult to prepare and purify. We report an operationally simple, double ion-exchange method to access organosulfates and sulfamates. Inspired by the novel sulfating reagent, TriButylSulfoAmmonium Betaine (TBSAB), we developed a 3-step procedure using tributylamine as the novel solubilising partner coupled to commercially available sulfating agents. Hence, in response to an increasing demand for complementary methods to synthesise organosulfates, we developed an alternative sulfation route based on an inexpensive, molecularly efficient and solubilising cation exchanging method using off-the-shelf reagents. The disclosed method is amenable to a range of differentially substituted benzyl alcohols, benzylamines and aniline and can also be performed at low temperature for sensitive substrates in good to excellent isolated yield.

scholarly journals Modification of acid on beta zeolite catalysts by ion-exchange method for ethanol dehydration to diethyl ether

2020 ◽  
Vol 10 (7) ◽  
pp. 697
Author(s):  
Montri Thapplee ◽  
Chadaporn Krutpijit ◽  
Piyasan Praserthdam ◽  
ฺีBunjerd Jongsomjit
Keyword(s):  
Catalytic Activity ◽  
Ion Exchange ◽  
Surface Area ◽  
Diethyl Ether ◽  
Nitrate Solution ◽  
Beta Zeolite ◽  
Ethanol Conversion ◽  
Ethanol Dehydration ◽  
Exchange Method ◽  
Ion Exchange Method

<p class="Mabstract">The catalytic ethanol dehydration to diethyl ether (DEE) over the synthesized beta zeolite (BEA) with different acidity on catalysts having Na and mixed Na-H forms was studied. The Na form of BEA catalyst was synthesized via the hydrothermal process, including non-calcined (Na-BEA_N) and calcined (Na-BEA_C) catalysts. The Na-BEA_C catalyst was successively used in the synthesis of different mixed Na-H forms under the ion-exchange method using the ammonium nitrate solution at 70°C for 2 h/cycle. In the present study, two different cycles were chosen, including one cycle (M-BEA_1) and four cycles (M-BEA_4) to compare the amount of acidity on catalysts. The results indicated that the M-BEA_1 catalyst exhibited a large surface area and contained the highest moderate acid site, which strongly affected the optimal catalytic activity at low temperature (&lt;250°C) with ethanol conversion of 74.6% and DEE yield of 27.3%. However, the increased number of ion-exchange cycles had not shown remarkable effects on catalytic activity due to low surface area and moderate acidity.<strong></strong></p>

A highly efficient Fe-Ni-S/NF hybrid electrode for promoting oxygen evolution performance

2021 ◽  
Author(s):  
YuYun Chen ◽  
Yang Xu ◽  
Shuai Niu ◽  
Jun Yan ◽  
Ye-Yu Wu ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Oxygen Evolution ◽  
Hierarchical Structure ◽  
Alkaline Solution ◽  
Exchange Method ◽  
Highly Efficient ◽  
Ion Exchange Method

In this study, a Fe-Ni-S/NF hybrid electrode with hierarchical structure was fabricated via a simple hydrothermal and ion exchange method, which exhibits remarkable OER performance in alkaline solution with an...

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