scholarly journals Design of Stable Palladium-Based Zeolite Catalysts for Complete Methane Oxidation by Postsynthesis Zeolite Modification

ACS Catalysis ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 2303-2312 ◽  
Author(s):  
Andrey W. Petrov ◽  
Davide Ferri ◽  
Oliver Kröcher ◽  
Jeroen A. van Bokhoven
Keyword(s):  
Methane Oxidation ◽  
Zeolite Catalysts ◽  
Zeolite Modification

scholarly journals Methane oxidation over zeolite catalysts prepared from geothermal fluids

2019 ◽  
Vol 285 ◽  
pp. 56-60 ◽  
Author(s):  
Aidan M. Doyle ◽  
Roxana Postolache ◽  
David Shaw ◽  
Roger Rothon ◽  
Lubomira Tosheva
Keyword(s):  
Methane Oxidation ◽  
Zeolite Catalysts ◽  
Geothermal Fluids

Hydrophobic zeolite modification for in situ peroxide formation in methane oxidation to methanol

Science ◽  
2020 ◽  
Vol 367 (6474) ◽  
pp. 193-197 ◽  
Author(s):  
Zhu Jin ◽  
Liang Wang ◽  
Erik Zuidema ◽  
Kartick Mondal ◽  
Ming Zhang ◽  
...  
Keyword(s):  
Methane Oxidation ◽  
Active Sites ◽  
Catalyst System ◽  
Oxidation Of Methane ◽  
Conversion Of Methane ◽  
Low Efficiency ◽  
Mild Temperature ◽  
Diffusion Of Hydrogen ◽  
Zeolite Modification

Selective partial oxidation of methane to methanol suffers from low efficiency. Here, we report a heterogeneous catalyst system for enhanced methanol productivity in methane oxidation by in situ generated hydrogen peroxide at mild temperature (70°C). The catalyst was synthesized by fixation of AuPd alloy nanoparticles within aluminosilicate zeolite crystals, followed by modification of the external surface of the zeolite with organosilanes. The silanes appear to allow diffusion of hydrogen, oxygen, and methane to the catalyst active sites, while confining the generated peroxide there to enhance its reaction probability. At 17.3% conversion of methane, methanol selectivity reached 92%, corresponding to methanol productivity up to 91.6 millimoles per gram of AuPd per hour.

scholarly journals Stable complete methane oxidation over palladium based zeolite catalysts

2018 ◽  
Vol 9 (1) ◽  
Author(s):  
Andrey W. Petrov ◽  
Davide Ferri ◽  
Frank Krumeich ◽  
Maarten Nachtegaal ◽  
Jeroen A. van Bokhoven ◽  
...  
Keyword(s):  
Methane Oxidation ◽  
Zeolite Catalysts

scholarly journals Comparison of Synthetic and Natural Zeolite Catalysts’ Behavior in the Production of Lactic Acid and Ethyl Lactate from Biomass-Derived Dihydroxyacetone

Catalysts ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1006
Author(s):  
Natalia Sobuś ◽  
Izabela Czekaj
Keyword(s):  
Lactic Acid ◽  
Natural Zeolite ◽  
Carbon Balance ◽  
Zeolite Beta ◽  
Synthetic Zeolite ◽  
Zeolite Catalysts ◽  
Ethyl Lactate ◽  
Hydrothermal Conditions ◽  
Natural Clinoptilolite ◽  
Zeolite Modification

This article presents the results of the conversion of dihydroxyacetone (DHA) to lactic acid (LA) with the use of zeolite catalysts. For this purpose, synthetic zeolite beta (BEA) and natural clinoptilolite (CLI) were used as a matrix. The zeolites were modified with various metals (Sn, Fe, Cu and Zn) during ion exchange under hydrothermal conditions. The DHA conversion process with the participation of metal-functionalized zeolites allowed us to obtain intermediates, i.e., pyruvic aldehyde (PAL), which during the further reaction was transformed into a mixture of products such as ethyl lactate (EL), pyruvic aldehyde (PA), lactic acid and ethyl acetate (EA). The best selectivity towards lactic acid was achieved using Sn-CLI (100%) > Na-BEA (98.7%) > Sn-BEA (95.9%) > Cu-BEA (92.9%), ethyl lactate using Cu-CLI, and pyruvic aldehyde using the Zn-BEA catalyst. In the case of a natural zeolite, modification with Sn is promising for obtaining a pure lactic acid with a relatively good carbon balance.

scholarly journals Investigating the influence of acid sites in continuous methane oxidation with N2O over Fe/MFI zeolites

2018 ◽  
Vol 8 (1) ◽  
pp. 154-163 ◽  
Author(s):  
Ying Kit Chow ◽  
Nicholas F. Dummer ◽  
James H. Carter ◽  
Christopher Williams ◽  
Greg Shaw ◽  
...  
Keyword(s):  
Methane Oxidation ◽  
Acid Sites ◽  
Zeolite Catalysts ◽  
Mfi Zeolite ◽  
Mfi Zeolites

Methane oxidation using N2O was carried out with Fe–MFI zeolite catalysts at 300 °C.

scholarly journals Effect of the synthetic zeolite modification on its physicochemical and catalytic properties in the preparation of the catalysts effectively removing sulphur dioxide from exhaust gases

2016 ◽  
Vol 18 (2) ◽  
pp. 40-45
Author(s):  
Agnieszka Marcewicz-Kuba
Keyword(s):  
Sulphur Dioxide ◽  
Coal Combustion ◽  
Catalytic Properties ◽  
Transition Metal Ions ◽  
Zeolite Catalysts ◽  
Hard Coal ◽  
Exhaust Gases ◽  
Sulfur Dioxide Emissions ◽  
Zeolite Modification ◽  
Sulphur Dioxide Emission

Abstract This work presents the research results of the influence of modification deSONOx type catalyst of the sulfur dioxide emissions in the process of the hard coal combustion. The addition of zeolite catalysts modified by transition metal ions: V, Mg, activated by zinc sorbent with or without graphite addition caused the deeper burning of coal grains. The addition of the deSOx catalysts to the coal resulted in lowered sulphur dioxide emission. The addition of unmodified zeolite to coal during combustion reduced sulphur dioxide emission at about 5%. The modification of the support by both V and Mg reduced the amount of sulphur dioxide significantly. The obtained results of SO2 removal from exhaust gases were from 34.5% for Sip/Mg to 68.3% for Sip/V.

Advances in ultramicrotomy for physical sciences applications

1993 ◽  
Vol 51 ◽  
pp. 710-711
Author(s):  
G. McMahon ◽  
T. Malis
Keyword(s):  
Particle Surface ◽  
Zeolite Catalysts ◽  
Physical Sciences ◽  
Pull Out ◽  
Large Particles ◽  
Novel Applications ◽  
Metal Wires ◽  
Frequent Problem ◽  
Specific Orientation ◽  
Diamond Knife

As with all techniques which are relatively new and therefore underutilized, diamond knife sectioning in the physical sciences continues to see both developments of the technique and novel applications.Technique Developments Development of specific orientation/embedding procedures for small pieces of awkward shape is exemplified by the work of Bradley et al on large, rather fragile particles of nuclear waste glass. At the same time, the frequent problem of pullout with large particles can be reduced by roughening of the particle surface, and a proven methodology using a commercial coupling agent developed for glasses has been utilized with good results on large zeolite catalysts. The same principle (using acid etches) should work for ceramic fibres or metal wires which may only partially pull out but result in unacceptably thick sections. Researchers from the life sciences continue to develop aspects of embedding media which may be applicable to certain cases in the physical sciences.

Methane Oxidation on a Coverage Layer Study

2008 ◽  
Author(s):  
Juliana L. Rose ◽  
Pedro Paulo F. Gouvêa ◽  
Cláudio F. Mahler
Keyword(s):  
Methane Oxidation
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