Evaluation of the Stability of Pure Silica MCM-41 toward Water Vapor

Langmuir ◽  
1999 ◽  
Vol 15 (26) ◽  
pp. 8895-8901 ◽  
Author(s):  
M. M. L. Ribeiro Carrott ◽  
A. J. Estêvão Candeias ◽  
P. J. M. Carrott ◽  
K. K. Unger
Keyword(s):  
Water Vapor ◽  
Pure Silica ◽  
The Stability ◽  
Mcm 41

Zn–Cu bimetallic catalysts supported on pure silica MCM-41 for acetylene hydration reaction

2018 ◽  
Vol 42 (8) ◽  
pp. 6507-6514 ◽  
Author(s):  
Qinqin Wang ◽  
Mingyuan Zhu ◽  
Caixia Xu ◽  
Haiyang Zhang ◽  
Xugen Wang ◽  
...  
Keyword(s):  
Bimetallic Catalysts ◽  
Hydration Reaction ◽  
Species Loss ◽  
Pure Silica ◽  
Mcm 41

The addition of copper improved the activity and stability of Zn–Cu/MCM bimetallic catalysts and interacted synergistically with Zn species and prevented Zn species loss during the reaction.

Preparation of Cross-Linked Cellulase Aggregate and Application to Cool Finishing of Cotton Fabric

2021 ◽  
Vol 8 (3) ◽  
pp. 1-7
Author(s):  
Gang Bai ◽  
Bingbing Feng ◽  
Yanchun Liu ◽  
Shujiao Dai
Keyword(s):  
Water Vapor ◽  
Cotton Fabric ◽  
Silicone Oil ◽  
Air Permeability ◽  
Kinetic Friction ◽  
Capillary Effect ◽  
Bending Rigidity ◽  
Moisture Permeability ◽  
Treated Sample ◽  
The Stability

Cellulase was immobilized by cross-linked enzyme aggregation to improve the stability of cellulase. The prepared cross-linked cellulase aggregates (CLCAs) and ice silicone oil were used for the cool finishing of cotton fabric. The results showed that the CLCAs extended the cellulase stability compared to free cellulase. The surface softness, smoothness, moisture permeability, and air permeability of the cotton fabric increased after CLCAs and ice silicone oil treatment. Shearing rigidity of the treated sample was 0.44 cN/(cm·deg), bending rigidity was 0.0069 cN cm, and the drape coefficient was 29.3%. Coefficient of kinetic friction of the treated sample was 0.186. The capillary effect of the treated fabric was 12.1 cm/(30 min). Air permeability was 354.3 L/(m2·s). Moisture penetrability was 3.912 g/(m2·d). The thermal and water-vapor resistance were 0.0194 m2·°C/W and 4.691 Pa·m2/W, respectively.

Adsorption energy of water vapor on high-silica and pure-silica zeolites

1989 ◽  
Vol 38 (12) ◽  
pp. 2625-2627 ◽  
Author(s):  
M. M. Dubinin ◽  
G. U. Rakhmatkariev ◽  
A. A. Isirikyan
Keyword(s):  
Water Vapor ◽  
Adsorption Energy ◽  
Pure Silica ◽  
High Silica

Comparative Study of Silylation Methods to Improve the Stability of Silicate MCM-41 in Aqueous Solutions

2003 ◽  
Vol 15 (3) ◽  
pp. 619-624 ◽  
Author(s):  
Jenny M. Kisler ◽  
Michelle L. Gee ◽  
Geoffrey W. Stevens ◽  
Andrea J. O'Connor
Keyword(s):  
Comparative Study ◽  
Aqueous Solutions ◽  
The Stability ◽  
Mcm 41

scholarly journals Continuous low-maintenance CO<sub>2</sub>/CH<sub>4</sub>/H<sub>2</sub>O measurements at the Zotino Tall Tower Observatory (ZOTTO) in Central Siberia

2010 ◽  
Vol 3 (4) ◽  
pp. 1113-1128 ◽  
Author(s):  
J. Winderlich ◽  
H. Chen ◽  
C. Gerbig ◽  
T. Seifert ◽  
O. Kolle ◽  
...  
Keyword(s):  
Water Vapor ◽  
Accurate Determination ◽  
Field Tests ◽  
Central Siberia ◽  
Mixing Ratios ◽  
Air Sample ◽  
The Stability ◽  
Carbon Dioxide Co2 ◽  
Tall Tower

Abstract. To monitor the continental carbon cycle, a fully automated low maintenance measurement system is installed at the Zotino Tall Tower Observatory in Central Siberia (ZOTTO, 60°48' N, 89°21' E) since April 2009. A cavity ring-down spectroscopy (CRDS) analyzer continuously measures carbon dioxide (CO2) and methane (CH4) from six heights up to 301 m a.g.l. Buffer volumes in each air line remove short term CO2 and CH4 mixing ratio fluctuations associated with turbulence, and allow continuous, near-concurrent measurements from all tower levels. Instead of drying the air sample, the simultaneously measured water vapor is used to correct the dilution and pressure-broadening effects for the accurate determination of dry air CO2 and CH4 mixing ratios. The stability of the water vapor correction was demonstrated by repeated laboratory and field tests. The effect of molecular adsorption in the wet air lines was shown to be negligible. The low consumption of four calibration tanks that need recalibration only on decadal timescale further reduces maintenance. The measurement precision (accuracy) of 0.04 ppm (0.09 ppm) for CO2 and 0.3 ppb (1.5 ppb) for CH4 is compliant with the WMO recommendations. The data collected so far (until April 2010) reveals a seasonal cycle amplitude for CO2 of 30.4 ppm at the 301 m level.

Synthesis of highly ordered boron-containing B–MCM-41 and pure silica MCM-41

1999 ◽  
Vol 33 (1-3) ◽  
pp. 165-172 ◽  
Author(s):  
U. Oberhagemann ◽  
M. Jeschke ◽  
H. Papp
Keyword(s):  
Pure Silica ◽  
Mcm 41
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