Advanced nanomaterials in oil and gas industry: Design, application and challenges

High efficient separation of U(VI) and Th(IV) from rare earth elements in strong acidic solution by selective sorption on phenanthroline diamide functionalized graphene oxide

The reinforcing ability of the fillers results in significant improvements in properties of polymer matrix at extremely low filler loadings as compared to conventional fillers. In view of this, the present review article describes the different methods used in preparation of different rubber nanocomposites reinforced with nanodimensional individual carbonaceous fillers, such as graphene, expanded graphite, single walled carbon nanotubes, multiwalled carbon nanotubes and graphite oxide, graphene oxide, and hybrid fillers consisting combination of individual fillers. This is followed by review of mechanical properties (tensile strength, elongation at break, Young modulus, and fracture toughness) and dynamic mechanical properties (glass transition temperature, crystallization temperature, melting point) of these rubber nanocomposites. Finally, Payne and Mullin effects have also been reviewed in rubber filled with different carbon based nanofillers.

/pdf/nanocarbon-reinforced-rubber-nanocomposites-detailed-27j7z2eewd.pdf

Nanocarbon Reinforced Rubber Nanocomposites: Detailed Insights about Mechanical, Dynamical Mechanical Properties, Payne, and Mullin Effects.

Covalent modification of Aramid fibers' surface via direct fluorination to enhance composite interfacial properties

Facile electrochemical co-deposition of metal (Cu, Pd, Pt, Rh) nanoparticles on reduced graphene oxide for electrocatalytic reduction of nitrate/nitrite

An efficient and recyclable catalyst was prepared by depositing rhodium nanoparticles (Rh NPs) on a SiO2 support with the surface modified by 3-aminopropyl-trimethoxysilane (APTS). The obtained catalyst, Rh(III)/MSiO2, was extensively characterized by FTIR, SEM, XRD, XPS, BET, and ICP to demonstrate the incorporation of amine groups on the surface of the modified SiO2. The hydrogenation of acrylonitrile butadiene rubber (NBR) was used to evaluate the catalytic properties of Rh(III)/MSiO2, and a 98.68% conversion and nearly 100% selectivity to CC were obtained under optimum conditions (120 °C, 3.0 MPa H2, 8 h). A comparative study was made between Rh(III)/MSiO2 and Rh(III)/SiO2 in the hydrogenation of NBR, and Rh(III)/MSiO2 showed higher activity and higher stability. The results indicated that the increase of the amount of deposited metal particles and the improvement of the adhesion of metal particles to the support are the reasons for the high performance of Rh(III)/MSiO2. In addition, the Rh(III)/MSiO2 could be easily recovered by centrifugation and reused 3 times with only a slight loss in activity and selectivity. Furthermore, this modified method can be extended to other heterogeneous catalyst systems to improve their activity, recyclability and stability.

Enhanced catalytic properties of rhodium nanoparticles deposited on chemically modified SiO2 for hydrogenation of nitrile butadiene rubber

The concept of hydrogenation of NBR using graphene-based catalysts is applied to prepare RGO/HNBR composites. The catalyst is synthesized by reduction of the mixture of a rhodium salt and dispersed graphite oxide sheets. Compared with HNBR, the obtained composite exhibits enhanced mechanical and electrical properties.

One-step fabrication of RGO/HNBR composites via selective hydrogenation of NBR with graphene-based catalyst

The invention discloses preparation of a silane coupling agent-modified SiO2 loaded rhodium catalyst and a selective hydrogenation application of the catalyst to butadiene-acrylonitrile rubber. The method comprises the following steps: (1) carrier modification, namely, modifying SiO2 by utilizing a silane coupling agent with an amino group in an organic solution or water so as to obtain modified SiO2; and (2) loading catalyst preparation, namely, adding the modified SiO2 into a rhodium solution, standing, washing and drying so as to obtain the loaded catalyst APTS (aminopropyltriethoxysilane)-SiO2-Rh. The prepared catalyst is used for nitrile butadiene rubber (NBR) hydrogenation research, and the hydrogenated butadiene-acrylonitrile rubber with the hydrogenation strength being more than 98% can be obtained. The preparation process is simple, and the adopted reaction raw materials are wide in source scope and small in toxicity and are economic and practicable. The NBR hydrogenation research shows that the hydrogenation efficiency is greatly improved, the hydrogenation strength is improved to above 98% from the original 52% under the same condition, and moreover, the recycling performance of the catalyst is also greatly improved after the reaction is ended. The APTS-SiO2-Rh is a high activity recycled NBR hydrogenation heterogeneous catalyst and is beneficial to HNBR (hydrogenated butadiene-acrylonitrile rubber) large-scale production.

Preparation of silane coupling agent-modified SiO2 loaded rhodium catalyst and selective hydrogenation application of catalyst to butadiene-acrylonitrile rubber

An Rh-based complex, T-Rh-PPh3, was developed through a facile one-step process. The T-Rh-PPh3 exhibited high activity and air stability in the hydrogenation of acrylonitrile–butadiene rubber. The enhanced air stability can be ascribed to the phenolic hydroxyl structures in tannin.

A ternary Rh complex catalyst highly active and stable in the hydrogenation of acrylonitrile–butadiene rubber

The invention discloses preparation and nitrile rubber hydrogenation application of a tannic acid rhodium coordination catalyst, belonging to the field of hydrogenation of unsaturated compounds containing carbon-carbon double bonds. Tannic acid can coordinate with rhodium chloride to generate a compound with a stable five-membered ring structure according to the chemical characteristics of a pyrogallol structure in the tannic acid, and an NBR (nitrile-butadiene rubber) homogeneous solution hydrogenation catalyst with high hydrogenation activity, high selectivity and good stability is prepared. The hydrogenation process conditions of NBR (nitrile-butadiene rubber) are as follows: the dosage of the catalyst accounts for 0.05-0.50% of the dry weight of the nitrile-butadiene rubber, the concentration of the solution is 2-10%, the intensity of pressure of hydrogen is 0.2-3 MPa, the reaction temperature is 60-160 DEG C, the reaction time is 2-24 hours, the dosage of triphenylphosphine accounts for 0-12 times of the dosage of the catalyst, and hydrogenated butadiene-acrylonitrile rubber (HNBR) with a hydrogenation degree of 98% can be prepared. The preparation and application of the invention are simple and safe, and the prepared catalyst is good in air stability so as to be stored for a long time. Furthermore, the catalyst is high in hydrogenation activity, good in selectivity, low in production cost and contributed to promoting the large scale production of the hydrogenated butadiene-acrylonitrile rubber.

Preparation and nitrile rubber hydrogenation application of tannic acid rhodium coordination catalyst

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