Thermal stability of TPA template and size-dependent selectivity of uncalcined TS-1 supported Au catalyst for propene epoxidation with H2 and O2

RSC Advances ◽  
2016 ◽  
Vol 6 (50) ◽  
pp. 44050-44056 ◽  
Author(s):  
X. Feng ◽  
D. Chen ◽  
X. G. Zhou
Keyword(s):  
Thermal Stability ◽  
Reaction Temperature ◽  
Formation Rate ◽  
Au Catalyst ◽  
Size Dependent ◽  
Thermal Stability Of

An Au/TS-1-B catalyst, whose internal TPA template is stable below 350 °C, shows volcano-shaped activity with reaction temperature and reaches a noteworthy PO formation rate (220 gPO h−1 kgCat−1) at 260 °C. Moreover, intrinsic size-dependent selectivity is also studied.

Properties of Polyaniline with the Doping of Different Acid

2012 ◽  
Vol 502 ◽  
pp. 31-35 ◽  
Author(s):  
Xiao Hua Wang
Keyword(s):  
Thermal Stability ◽  
Reaction Time ◽  
Reaction Temperature ◽  
Acid Content ◽  
In Situ Polymerization ◽  
Ammonium Persulfate ◽  
Dodecylbenzenesulfonic Acid ◽  
Thermal Stability Of

Polyaniline(PANI) with the doping of hydrochloride(HC1), aminosulfonic acid (NH2SO3H) or dodecylbenzenesulfonic acid(DBSA) was prepared by in-situ polymerization. Effects of acid content, reaction time, oxidant ammonium persulfate (APS) dosage and reaction temperature on the conductivity of PANI were studied. The resistance and thermal stability of them were compared. Results show that the largest conductivity of HC1-PANI is 1.98 s.cm-1 among them in case the C(HC1)=0.5mol/L, reaction time is 6.0h, n(APS/aniline)=1.0; The conductivity of NH2SO3H-PANI is 0.2s.cm-1 in case the C(NH2SO3H)=1.0mol/L, reaction time is 6.0h, n(APS/aniline)=2.0; The conductivity of DBSA-PANI is 0.98s.cm-1 in case the C(DBSA)=1.0 mol/L, reaction time is 8.0h, n(APS/aniline) = 2.0. The the least resistance of HC1-PANI is 10Ω, and that of NH2SO3H- PANI is the largest of 120Ω. The order of their thermal stability is DBSA-PANI > NH2SO3H-PANI > HC1-PANI before 350°C, that of their thermal stability is inverse when it reaches 350°C.

scholarly journals Morphology and Thermal Properties of Calcium Alginate/Reduced Graphene Oxide Composites

Polymers ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 990 ◽  
Author(s):  
Wanting Zhao ◽  
Yan Qi ◽  
Yue Wang ◽  
Yun Xue ◽  
Peng Xu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Graphene Oxide ◽  
Thermal Properties ◽  
Reduced Graphene Oxide ◽  
Calcium Alginate ◽  
Formation Rate ◽  
Carbon Formation ◽  
High Heat Transfer ◽  
Reduced Graphene ◽  
Thermal Stability Of

Calcium alginate (CaAlg) is a kind of biodegradable and eco-friendly functional material, and CaAlg/reduced graphene oxide (rGO) composites are expected to be applied as new textile, heat-generating, and flame-retardant materials. In this paper, the CaAlg/rGO composites were prepared by a sol-gel method and their morphological and thermal properties were studied. The results showed that the introduction of rGO can efficiently improve the thermal stability of CaAlg. Further study showed that rGO increased the carbon formation rate by 4.1%, indicating that the thermal stability was improved by the promotion of carbon formation. Moreover, the weight loss rate of the composites was faster at 180–200 °C than that of CaAlg, after which the rate was less comparatively, suggesting the better thermal stability of the composite. This maybe because the high heat transfer efficiency of rGO allowed the material to reach the temperature of the thermal decomposition of the glycan molecule chain within a short time, and then promoted carbon formation. The thermal cracking mechanism of the composites is proposed based on the experimental data.

scholarly journals Synthesis, Optimization, Property, Characterization, and Application of Dialdehyde Cross-Linking Guar Gum

2016 ◽  
Vol 2016 ◽  
pp. 1-14 ◽  
Author(s):  
Tang Hongbo ◽  
Li Yanping ◽  
Zhang Wen ◽  
Dong Siqing
Keyword(s):  
Thermal Stability ◽  
Reaction Time ◽  
Reaction Temperature ◽  
Guar Gum ◽  
Sodium Periodate ◽  
Decomposition Temperature ◽  
Melting Enthalpy ◽  
Cross Linking ◽  
The Cross ◽  
Thermal Stability Of

Dialdehyde cross-linking guar gum (DCLGG), as a novel material, was synthesized using phosphorus oxychloride as a cross-linking reagent, sodium periodate as an oxidant, and ethanol as a solvent through keeping the original particle form of guar gum. The process parameters such as the reaction temperature, reaction time, pH, amount of sodium periodate, and amount of ethanol were optimized by the response surface methodology in order to obtain the regression model of the oxidization. The covalent binding of L-asparagine onto the surfaces of DCLGG was further investigated. The results showed that the best technological conditions for preparing DCLGG were as follows: reaction temperature = 40°C, reaction time = 3.0 h, pH = 4.0, and amount of ethanol = 74.5%. The swelling power of DCLGG was intermediate between cross-linking guar gum and dialdehyde guar gum. The cross-linking and dialdehyde oxidization reduced the viscosity of GG. The cross-liking reduced the melting enthalpy of GG. However, the oxidization increased melting enthalpy of ACLGG. The thermal stability of GG was increased by cross-linking or oxidization. The variation of the onset decomposition temperature and end decomposition temperature of GG was not consistent with thermal stability of GG. L-asparagine could be chemically bound well by DCLGG through forming Schiff base under the weak acidity. The maximum adsorption capacity of L-asparagine on DCLGG with aldehyde content of 56.2% reached 21.9 mg/g.

scholarly journals In-situ TEM Study on Size-dependent Thermal Stability of Nickel Filled Silica Nano-Opals

2017 ◽  
Vol 23 (S1) ◽  
pp. 956-957 ◽  
Author(s):  
Parivash Moradifar ◽  
Yunzhi Liu ◽  
Jennifer L. Russell ◽  
Thomas E. Mallouk ◽  
John Badding ◽  
...  
Keyword(s):  
Thermal Stability ◽  
In Situ Tem ◽  
Size Dependent ◽  
Thermal Stability Of

scholarly journals Isogeometric analysis for size-dependent nonlinear thermal stability of porous FG microplates

2019 ◽  
Vol 221 ◽  
pp. 110838 ◽  
Author(s):  
Cuong-Le Thanh ◽  
Loc V. Tran ◽  
Tinh Quoc Bui ◽  
Hoang X. Nguyen ◽  
M. Abdel-Wahab
Keyword(s):  
Thermal Stability ◽  
Isogeometric Analysis ◽  
Size Dependent ◽  
Thermal Stability Of

Size-dependent formation and thermal stability of high-order twins in hierarchical nanotwinned metals

2020 ◽  
Vol 128 ◽  
pp. 102685 ◽  
Author(s):  
Ligang Sun ◽  
Dongfeng Li ◽  
Linli Zhu ◽  
Haihui Ruan ◽  
Jian Lu
Keyword(s):  
Thermal Stability ◽  
High Order ◽  
Size Dependent ◽  
Thermal Stability Of
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