Effects of temperature pretreatment on propane cracking over H-SSZ-13 zeolites

2015 ◽  
Vol 5 (1) ◽  
pp. 264-273 ◽  
Author(s):  
J. H. Yun ◽  
R. F. Lobo
Keyword(s):  
Catalytic Activity ◽  
Thermal Treatment ◽  
Propane Conversion ◽  
Temperature Pretreatment ◽  
Effects Of Temperature ◽  
Propane Cracking

The effect of thermal treatment of SSZ-13 on catalytic activity has been investigated by using monomolecular propane conversion as a probe reaction.

scholarly journals Role of CO2 During Oxidative Dehydrogenation of Propane Over Bulk and Activated-Carbon Supported Cerium and Vanadium Based Catalysts

2021 ◽  
Author(s):  
Petar Djinović ◽  
Janez Zavašnik ◽  
Janvit Teržan ◽  
Ivan Jerman
Keyword(s):  
Catalytic Activity ◽  
Activated Carbon ◽  
Oxidative Dehydrogenation ◽  
Active Phase ◽  
Lattice Oxygen ◽  
Chemisorbed Oxygen ◽  
Catalytically Active ◽  
Temperature Programmed ◽  
Propane Cracking

AbstractCeO2, V2O5 and CeVO4 were synthesised as bulk oxides, or deposited over activated carbon, characterized by XRD, HRTEM, CO2-TPO, C3H8-TPR, DRIFTS and Raman techniques and tested in propane oxidative dehydrogenation using CO2. Complete oxidation of propane to CO and CO2 is favoured by lattice oxygen of CeO2. The temperature programmed experiments show the ~ 4 nm AC supported CeO2 crystallites become more susceptible to reduction by propane, but less prone to re-oxidation with CO2 compared to bulk CeO2. Catalytic activity of CeVO4/AC catalysts requires a 1–2 nm amorphous CeVO4 layer. During reaction, the amorphous CeVO4 layer crystallises and several atomic layers of carbon cover the CeVO4 surface, resulting in deactivation. During reaction, V2O5 is irreversibly reduced to V2O3. The lattice oxygen in bulk V2O5 favours catalytic activity and propene selectivity. Bulk V2O3 promotes only propane cracking with no propene selectivity. In VOx/AC materials, vanadium carbide is the catalytically active phase. Propane dehydrogenation over VC proceeds via chemisorbed oxygen species originating from the dissociated CO2. Graphic Abstract

Application of Deep Eutectic Solvent (DES) as a Reaction Media for the Esterification of Acrylic Acid with n-Butanol

2015 ◽  
Vol 13 (3) ◽  
pp. 389-393 ◽  
Author(s):  
Emine Sert
Keyword(s):  
Catalytic Activity ◽  
Acrylic Acid ◽  
Batch Reactor ◽  
Choline Chloride ◽  
Deep Eutectic Solvent ◽  
Molar Ratio ◽  
Catalyst Loading ◽  
Toluene Sulfonic Acid ◽  
Effects Of Temperature ◽  
Reaction Media

Abstract Within the framework of green chemistry, catalysts should be met different criteria such as biodegradability, recyclability, flammability, non-toxicity and low price. Acidic deep eutectic solvent (DES) have been synthesized for this purpose, by mixing para-toluene sulfonic acid and choline chloride. The catalytic activity of DES was studied in the esterification of acrylic acid with n-butanol. The usage of DES as catalyst is simple, safe and cheap. The effects of temperature, catalyst loading, n-butanol/acrylic acid molar ratio on the conversion of acrylic acid were performed. The batch reactor experiments were carried out at temperatures of 338, 348, 358 and 368 K, molar ratio of butanol to acrylic acid of 1, 2,3 and catalyst loading of 10, 15, 20 and 90 g/L. 90.2% of acrylic acid conversion was achieved at a temperature of 358 K and catalyst loading of 20 g/L. Reusability of DES was investigated. Reusability and catalytic activity makes DES efficient as catalyst.

scholarly journals Graphene Oxide and Oxidized Carbon Black as Catalyst for Crosslinking of Phenolic Resins

Polymers ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1330 ◽  
Author(s):  
Maria Rosaria Acocella ◽  
Aniello Vittore ◽  
Mario Maggio ◽  
Gaetano Guerra ◽  
Luca Giannini ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Graphene Oxide ◽  
Catalytic Activity ◽  
Thermal Treatment ◽  
Carbon Black ◽  
Crosslinking Reaction ◽  
Scanning Calorimetry ◽  
Indirect Methods ◽  
Phenolic Resins ◽  
Oxidized Carbon

Influence of different graphite-based nanofillers on crosslinking reaction of resorcinol, as induced by hexa(methoxymethyl)melamine, is studied. Curing reactions leading from low molecular mass compounds to crosslinked insoluble networks are studied by indirect methods based on Differential Scanning Calorimetry. Reported results show a catalytic activity of graphene oxide (eGO) on this reaction, comparable to that one already described in the literature for curing of benzoxazine. For instance, for an eGO content of 2 wt %, the exothermic crosslinking DSC peak (upon heating at 10 °C/min) shifted 6 °C. More relevantly, oxidized carbon black (oCB) is much more effective as catalyst of the considered curing reaction. In fact, for an oCB content of 2 wt %, the crosslinking DSC peak can be shifted more than 30 °C and a nearly complete crosslinking is already achieved by thermal treatment at 120 °C. The possible origin of the higher catalytic activity of oCB with respect to eGO is discussed.

Preparation, Characterization, and Oxidative Dehydrogenation of C3H8 with CO2 of V-Cr/SBA-15/Al2O3/FeCrAl Metal Monolithic Catalysts

2011 ◽  
Vol 287-290 ◽  
pp. 1671-1674 ◽  
Author(s):  
Hong Jiang Zhang ◽  
Zhi Gang Jia ◽  
Sheng Fu Ji
Keyword(s):  
Catalytic Activity ◽  
Oxidative Dehydrogenation ◽  
Mesoporous Structure ◽  
Propane Conversion ◽  
Monolithic Catalysts ◽  
Propylene Selectivity ◽  
Vanadium Species

A series of V-Cr/SBA-15/Al2O3/FeCrAlmetal monolithic catalystswithV content of 10wt% and Cr contents from 0 to 12.5wt% were prepared. The structure of the catalysts was characterized using XRD, XPS and TPR techniques. The catalytic activity for oxidative dehydrogenation (ODH) of propane with CO2was evaluated. The results indicate that the mesoporous structure of SBA-15 was retained after vanadium and chromium incorporation and the vanadium species were well dispersed. The V-Cr/SBA-15/Al2O3/FeCrAl catalyst with 10wt%V and 10 wt% Cr exhibited the best activity with a propane conversion of 49.9% and a propylene selectivity of 86.5% at 650 °C.

The Influence of Thermal Treatment Temperature on the Structure and Performance of Monocarboxyphenyl Cobalt Porphyrin Loaded on Carbon Carrier as an Electrocatalyst for Oxygen Reduction

2012 ◽  
Vol 573-574 ◽  
pp. 27-30
Author(s):  
Huan Bao Fa ◽  
Li Ping Zhang ◽  
Wei Yin ◽  
Jing Ting Zhou ◽  
Nan Nan Xu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Thermal Treatment ◽  
Oxygen Reduction ◽  
Catalytic Performance ◽  
Treatment Temperature ◽  
Proton Exchange ◽  
Thermal Treatment Temperature ◽  
Synthetic Compound ◽  
Cobalt Porphyrin ◽  
Carbon Carrier

The monocarboxyphenyl cobalt porphyrin (CoMCPP) was synthesized and incorporated into carbon carrier acetylene black (ACET) for proton exchange membrane fuel cell cathode oxygen reduction. The influence of different thermal treatment temperature on the catalytic performance of the composite catalysts was discussed. The synthetic compound catalyst was analyzed by XRD、IR. The electrochemical catalytic performance of catalyst, which was heat-treated under different temperature, for oxygen reduction was tested by linear sweep voltammetry (LSV). The result shows that the best thermal treatment temperature is 6000C, and its catalytic activity also shows the best, the catalytic activity site changes from CoN4 to C-N-Co.

scholarly journals Characteristics of polyamine stimulation of cyclic nucleotide-independent protein kinase reactions

1985 ◽  
Vol 232 (3) ◽  
pp. 767-771 ◽  
Author(s):  
K Ahmed ◽  
S A Goueli ◽  
H G Williams-Ashman
Keyword(s):  
Catalytic Activity ◽  
Protein Kinase ◽  
Protein Kinases ◽  
Nuclear Protein ◽  
Direct Stimulation ◽  
Protein Substrate ◽  
Protein Substrates ◽  
Effects Of Temperature ◽  
Independent Protein ◽  
Stimulation Of

The extent of direct stimulation by spermine of reactions catalysed by nuclear N1 and N2 protein kinases purified from liver and prostate depends critically on the nature of the protein substrate. The chemically inert Co(NH3)36+ ion exerts effects on protein kinase reactions similar to those of spermidine or spermine. This enhancement of the phosphorylation of various protein substrates by polyamines or Co(NH3)63+ by purified nuclear protein kinase preparations was studied in relation to effects of temperature, pH and other factors. The results provide further support for our hypothesis [Ahmed, Wilson, Goueli & Williams-Ashman (1978) Biochem. J. 176, 739-750] that the enhancement of certain protein kinase reactions by polycations relates primarily to their interaction with the protein substrate, yielding more favourable conformations for phosphorylation by the protein kinase, rather than a direct effect on its catalytic activity.

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