Catalytic activity of nitrogen-containing molecular sieves and nitrogen-containing carbon for α,β-unsaturated esters production

2011 ◽  
Vol 172 (2-3) ◽  
pp. 1054-1065 ◽  
Author(s):  
Izabel M. Nogueira ◽  
Josue M. Filho ◽  
Pedro Hermano M. de Vasconcelos ◽  
Gilberto D. Saraiva ◽  
Alcineia C. Oliveira
Keyword(s):  
Catalytic Activity ◽  
Molecular Sieves ◽  
Unsaturated Esters

Synthesis, characterization and catalytic activity of actinide Th-MCM-41 and U-MCM-41 hexagonal packed mesoporous molecular sieves

2001 ◽  
Vol 171 (1-2) ◽  
pp. 229-241 ◽  
Author(s):  
Rodica Tismaneanu ◽  
Biswajit Ray ◽  
Rafael Khalfin ◽  
Rafi Semiat ◽  
Moris S. Eisen
Keyword(s):  
Catalytic Activity ◽  
Molecular Sieves ◽  
Mesoporous Molecular Sieves ◽  
Mcm 41

Immobilization of metalloporphyrin complexes in molecular sieves and their catalytic activity

2005 ◽  
Vol 6 (8) ◽  
pp. 531-538 ◽  
Author(s):  
V. Radha Rani ◽  
M. Radha Kishan ◽  
S.J. Kulkarni ◽  
K.V. Raghavan
Keyword(s):  
Catalytic Activity ◽  
Molecular Sieves

Catalytic Activity of Dehydrogenation of Methanol to MF over Cu/MCM-41 and Cu-ZnO/MCM-41 Prepared by Impregnation and Grinding

2011 ◽  
Vol 396-398 ◽  
pp. 730-733
Author(s):  
Guo Ru Li ◽  
Gong Li ◽  
Shu Xi Zhou ◽  
Hui Juan Tong
Keyword(s):  
Catalytic Activity ◽  
Atmospheric Pressure ◽  
Molecular Sieves ◽  
Conversion Rate ◽  
Methyl Formate ◽  
Methanol Conversion ◽  
N2 Adsorption ◽  
Flow Microreactor ◽  
Adsorption Desorption ◽  
Mcm 41

Abstract. Using MCM-41 molecular sieves as the support, Cu-ZnO/MCM-41 and Cu/MCM-41 catalysts were prepared by impregnation and grinding. The catalysts were characterized by XRD, N2 adsorption-desorption and TPR methods. The catalytic activity of the dehydrogenation of methanol to methyl formate (MF) was evaluated using the flow microreactor under atmospheric pressure. According to the results, the catalyst prepared by impregnation had a better selectivity for the MF, but a lower methanol conversion rate. However, the product's selectivity could be improved by adding ZnO additive while the methanol conversion rate was reduced. For Cu/MCM-41 prepared by impregnation and grinding, the methanol conversion rate was 20.18% and 24.13% respectively at 250°C and the MF selectivity was 73.75% and 67.35% respectively. Likewise for Cu-ZnO/MCM-41 prepared by impregnation and grinding, the methanol conversion rate was 15.28% and 18.83% respectively at 250°C and the MF selectivity was 81.31% and 75.32% respectively.

Catalytic Activity of Heteropolytungstic Acid Encapsulated into Mesoporous Material Structure

2007 ◽  
Vol 5 (1) ◽  
Author(s):  
Gonul Gunduz ◽  
Rayna P. Dimitrova ◽  
Selahattin Yilmaz
Keyword(s):  
Catalytic Activity ◽  
Molecular Sieves ◽  
Mesoporous Material ◽  
Heteropoly Acid ◽  
Methanol Conversion ◽  
Tungstophosphoric Acid ◽  
Material Structure ◽  
Acetate Oxidation ◽  
Mcm 41 ◽  
Model Reactions

The paper presents a spectroscopic and catalytic study of encapsulated Keggin type heteropoly acid (12-tungstophosphoric acid, HPW) in the mesopores of MCM-41 molecular sieves. Nitrogen physisorption, FTIR, SEM, XRD and catalytic methods have been used to characterize and compare the properties of the samples. Methanol conversion, ?-pinene isomerization and ethyl acetate oxidation have been applied as model reactions for the evaluation of acid site activity. The combined physicochemical and catalytic investigations clearly show that the introduction of 12-tungstophosphoric acid into MCM-41 causes significant changes in the properties of the sample.

Acidity and catalytic activity of SAPO-5 and AlPO-5 molecular sieves

Zeolites ◽  
1988 ◽  
Vol 8 (2) ◽  
pp. 137-141 ◽  
Author(s):  
S.G. Hedge ◽  
P. Ratnasamy ◽  
L.M. Kustov ◽  
V.B. Kazansky
Keyword(s):  
Catalytic Activity ◽  
Molecular Sieves

Emission Control Catalyst Derived from Mesoporous Molecular Sieves

1996 ◽  
Vol 431 ◽  
Author(s):  
Partha P. Paul ◽  
Michael A. Miller ◽  
Martin J. Heimrich ◽  
Stuart T. Schwab
Keyword(s):  
Catalytic Activity ◽  
Fuel Economy ◽  
Molecular Sieves ◽  
Emission Control ◽  
Mesoporous Molecular Sieves ◽  
Exhaust Gas ◽  
Engine Exhaust ◽  
Combustion Processes ◽  
Mcm 41

AbstractA lean NOx catalyst is needed to control NOx emissions generated by oxygen-rich combustion processes to obtain higher fuel economy. We have developed such a catalyst using modified mesoporous molecular sieves (MCM-41). An iron(II)-complex impregnated MCM-41 has been synthesized which has been further treated with [Pd(NH3)4]Cl2. This treatment resulted in further exchange of Na+ ions of the molecular sieves with Pd(NH3)42+ thus forming Catalyst A. The catalytic activity towards NOx, CO and HC was studied using simulated exhaust gas, as well as engine exhaust gas.

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