Hydrothermal stability of fluorine‐induced microporous silica membranes: effect of steam treatment conditions

AIChE Journal ◽  
2021 ◽  
Author(s):  
Masakoto Kanezashi ◽  
Naoya Hataoka ◽  
Rana Ikram ◽  
Hiroki Nagasawa ◽  
Toshinori Tsuru
Keyword(s):  
Hydrothermal Stability ◽  
Steam Treatment ◽  
Microporous Silica ◽  
Silica Membranes ◽  
Treatment Conditions

Hydrothermal stability of pure and modified microporous silica membranes

1995 ◽  
Vol 30 (11) ◽  
pp. 2803-2808 ◽  
Author(s):  
G. P. Fotou ◽  
Y. S. Lin ◽  
S. E. Pratsinis
Keyword(s):  
Hydrothermal Stability ◽  
Microporous Silica ◽  
Silica Membranes

Hydrothermal stability of cobalt silica membranes in a water gas shift membrane reactor

2009 ◽  
Vol 66 (2) ◽  
pp. 299-305 ◽  
Author(s):  
Scott Battersby ◽  
Simon Smart ◽  
Bradley Ladewig ◽  
Shaomin Liu ◽  
Mikel C. Duke ◽  
...  
Keyword(s):  
Membrane Reactor ◽  
Hydrothermal Stability ◽  
Water Gas Shift ◽  
Silica Membranes ◽  
Water Gas

ChemInform Abstract: Evolution of Pore Structure in Microporous Silica Membranes: Sol-Gel Procedures and Strategies.

ChemInform ◽  
2010 ◽  
Vol 29 (17) ◽  
pp. no-no
Author(s):  
B. N. NAIR ◽  
K. KEIZER ◽  
T. OKUBO ◽  
S.-I. NAKAO
Keyword(s):  
Pore Structure ◽  
Sol Gel ◽  
Microporous Silica ◽  
Silica Membranes

Defects in microporous silica membranes: Analysis and repair

2010 ◽  
Vol 73 (1) ◽  
pp. 20-24 ◽  
Author(s):  
D. Koutsonikolas ◽  
S. Kaldis ◽  
G.P. Sakellaropoulos ◽  
Martijn H. van Loon ◽  
Ruud W.J. Dirrix ◽  
...  
Keyword(s):  
Microporous Silica ◽  
Silica Membranes

Effects of thermo-hygro-mechanical (THM) treatment on the viscoelasticity of in-situ lignin

Holzforschung ◽  
2017 ◽  
Vol 71 (6) ◽  
pp. 455-460 ◽  
Author(s):  
Juan Guo ◽  
Jiangping Yin ◽  
Yonggang Zhang ◽  
Lennart Salmén ◽  
Yafang Yin
Keyword(s):  
Compression Ratio ◽  
Softening Temperature ◽  
Mechanical Analysis ◽  
Wood Products ◽  
Steam Treatment ◽  
Steam Temperature ◽  
Appreciable Change ◽  
Treatment Conditions ◽  
Softening Process

Abstract For producing wood products without fractures based on thermo-hygro-mechanical (THM) treatments, it is essential to understand how steaming and compression change the wood softening and cell wall components. In this paper, the effects of compression combined with steam treatment (CS) on the viscoelasticity of the in-situ lignin of Chinese fir has been investigated through dynamic mechanical analysis (DMA) under fully saturated conditions. Several variations were studied, such as the softening temperature (Tg) and apparent activation energy (ΔHa) of the softening process in response to CS treatment conditions (such as steam temperature and compression ratio) under separate consideration of earlywood (EW) and latewood (LW). No difference between EW and LW with respect to the viscoelasticity was noted. Tg and ΔHa of the lignin softening were nearly unaffected by the compression ratio, but were highly influenced by the steam temperature. The Tg decreased significantly with CS treatments at or above 160oC, but showed no appreciable change, compared to the native wood, at the lower steaming temperature of 140oC. ΔHa increased at higher steam temperatures, while ΔHa showed a decreasing tendency with decreasing Tg. This indicates that lignin undergoes a simultaneous depolymerization as well as a condensation during CS treatment.

Physicochemical characterisation and hydrothermal stability investigation of cobalt-incorporated silica xerogels

RSC Advances ◽  
2014 ◽  
Vol 4 (36) ◽  
pp. 18862-18870 ◽  
Author(s):  
Liang Liu ◽  
David K. Wang ◽  
Dana. L. Martens ◽  
Simon Smart ◽  
Ekaterina Strounina ◽  
...  
Keyword(s):  
Cobalt Oxide ◽  
Structural Rearrangement ◽  
Hydrothermal Stability ◽  
Silica Xerogels ◽  
Silica Network ◽  
Microporous Silica ◽  
Stability Investigation ◽  
Physicochemical Characterisation

High cobalt oxide concentrations were able to shield the microporous silica network from excessive structural rearrangement during harsh hydrothermal testing.

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