scholarly journals Niobium-substituted octahedral molecular sieve (OMS-2) materials in selective oxidation of methanol to dimethoxymethane

RSC Advances ◽  
2019 ◽  
Vol 9 (56) ◽  
pp. 32665-32673 ◽  
Author(s):  
Niluka D. Wasalathanthri ◽  
Curtis Guild ◽  
Quddus A. Nizami ◽  
Shanka L. Dissanayake ◽  
Junkai He ◽  
...  
Keyword(s):  
Selective Oxidation ◽  
Partial Oxidation ◽  
Temperature Regime ◽  
Molecular Sieve ◽  
Active Sites ◽  
Promising Candidate ◽  
Oxidation Of Methanol ◽  
Partial Oxidation Of Methanol ◽  
Lower Temperature

The prepared bifunctional Nb-OMS-2 catalysts are promising candidate in partial oxidation of methanol into dimethoxymethane at a lower temperature suggesting that there is an important temperature regime when forming active sites for DMM production.

scholarly journals Effect of Mo Dispersion on the Catalytic Properties and Stability of Mo–Fe Catalysts for the Partial Oxidation of Methanol

Molecules ◽  
2020 ◽  
Vol 25 (10) ◽  
pp. 2410
Author(s):  
Shuai Zhang ◽  
Minghan Han
Keyword(s):  
Surface Layer ◽  
Surface Area ◽  
Partial Oxidation ◽  
Active Sites ◽  
Oxygen Vacancies ◽  
Catalyst Surface ◽  
Catalytic Properties ◽  
Oxidation Of Methanol ◽  
Partial Oxidation Of Methanol ◽  
Fe Catalysts

Mo–Fe catalysts with different Mo dispersions were synthesized with fast (Cat-FS, 600 r·min−1) or slow stirring speed (Cat-SS, 30 r·min−1) by the coprecipitation method. Improving the stirring speed strengthened the mixing of the solution and increased the dispersion of particles in the catalyst, which exhibited favorable activity and selectivity. The byproduct (dimethyl ether (DME)) selectivity increased from 2.3% to 2.8% with Cat-SS, while it remained unchanged with Cat-FS in a stability test. The aggregation of particles and thin Mo-enriched surface layer decreased the catalyst surface area and slowed down the reoxidation of reduced active sites with Cat-SS, leaving more oxygen vacancies which promoted the formation of DME by the nonoxidative channel.

scholarly journals The Promotional Effects of ZrO2 and Au on the CuZnO Catalyst Regarding the Durability and Activity of the Partial Oxidation of Methanol

Catalysts ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 345
Author(s):  
Hsiao-Yu Huang ◽  
Hao-I Chen ◽  
Yuh-Jeen Huang
Keyword(s):  
Partial Oxidation ◽  
Ignition Temperature ◽  
Aging Process ◽  
Accelerated Aging ◽  
Methanol Conversion ◽  
Oxidation Of Methanol ◽  
Partial Oxidation Of Methanol ◽  
Deactivation Rate Constant ◽  
Lower Temperature ◽  
Better Than

The promoter ZrO2 was applied to prevent Cu crystallites from sintering over CZ (ca. Cu 30 wt.% and Zn 70 wt.%) under partial oxidation of the methanol (POM) reaction. Gold was selected to promote the performance of CZrZ (ca. Cu 31 wt.%, Zr 16 wt.%, and Zn 53 wt.%) catalyst to overcome a high ignition temperature of 175 °C and CO selectivity (SCO) (>10% at T. > 200 °C). Experimentally, the deactivation rate constant of A5CZrZ (ca. Au 5 wt.%, Cu 31 wt.%, Zr 17 wt.%, and Zn 47 wt.%) and CZrZ was 1.7 times better than A5CZ (ca. Au 5 wt.%, Cu 31 wt.%, and Zn 64 wt.%) and CZ. The methanol conversion of CZrZ and A5CZrZ catalysts was kept higher than 70% for 12 h in an accelerated aging process. Meanwhile, the Au prompted more methoxy species oxidizing to formate on Cu+-rich A5CZrZ surface at lower temperature, and also improved CO transfer from formate reacting with moveable oxygen to form CO2. The SCO can lower to ca. 6% at 200 °C after adding 3–5% of gold promoter. These features all prove that the CZ catalyst with ZrO2 and Au promoters could enhance catalytic activity, lower the SCO and ignition temperature, and maintain good durability in the POM reaction.

Modulation of the selectivity in partial oxidation of methanol over CuZnAl catalysts by adding CO 2 and/or H 2 into the reaction feed

2015 ◽  
Vol 168-169 ◽  
pp. 14-24 ◽  
Author(s):  
Silvia R. González Carrazán ◽  
Robert Wojcieszak ◽  
Raquel. M. Blanco ◽  
Cecilia Mateos-Pedrero ◽  
Patricio Ruiz
Keyword(s):  
Partial Oxidation ◽  
Oxidation Of Methanol ◽  
Partial Oxidation Of Methanol

scholarly journals Partial Oxidation of Methanol Over Highly Dispersed Vanadia Supported on Silica SBA-15

2005 ◽  
Vol 105 (1-2) ◽  
pp. 1-8 ◽  
Author(s):  
C. Hess ◽  
Ian J. Drake ◽  
James D. Hoefelmeyer ◽  
T. Don Tilley ◽  
Alex T. Bell
Keyword(s):  
Partial Oxidation ◽  
Oxidation Of Methanol ◽  
Partial Oxidation Of Methanol ◽  
Highly Dispersed

Partial oxidation of methanol to produce hydrogen over CuZn-based catalysts

1997 ◽  
Vol 162 (1-2) ◽  
pp. 281-297 ◽  
Author(s):  
L. Alejo ◽  
R. Lago ◽  
M.A. Peña ◽  
J.L.G. Fierro
Keyword(s):  
Partial Oxidation ◽  
Oxidation Of Methanol ◽  
Partial Oxidation Of Methanol
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