Powder materials are generally used in a variety of applications due to advantageous properties such as high surface area, high dispersion and favorable diffusion of molecules. However, when used in a continuous flow process, it causes many problems such as loss of materials, pressure drop, and difficulty of recovery and recyclability. To overcome the drawbacks, the powder-typed materials should be processed to shaped particles such as pellet and bead. The shaped ones can be easily separated, recovered and recycled. In this presentation, we report our recently progress on synthesis of Bead-Shaped Porous Oxide materials with tunable property for environmental applications.
The development of metallocene/methylaluminoxane (MAO) catalysts was a way for the synthesis of new kinds of polyolefins, the biggest part in polymer chemistry and mainly produced by Ziegler-Natta and Phillips catalysts. Different transition metal complexes together with MAO as cocatalyst allow the synthesis of polymers with a highly defined microstructure, tacticity, and stereoregularity as well as short or long chain branched copolymers with excellent properties. The single site character of metallocene catalysts leads to a better understanding of the mechanism of the olefin polymerization.
Resid fluid catalytic cracking (RFCC), is more economical, flexible and can be controlled by adjusting the catalyst composition and operating conditions. Addition of olefin-selective catalyst into the catalyst system is another efficient option to increase the yield of light olefins. In this paper, we are presenting the results of maximizing the yield of ethylene, propylene and C4 olefins without impacting the main catalyst activity. The developed new additive catalyst was tested using ACE and circulating riser units. The outcome of the results showed that increase in ethylene, propylene and butylene than base case and with improved bottom cracking activity.
Energy conversion & storage is one of the most important technologies, related to not only environmental problems, but also cultures in future society consuming high energy. Especially, energy storage is of critical importance because it is a limiting factor in achieving complete and independent stretchable electronics for the next generation. Here, several types of electrode architectures were introduced to overcome the congested period of the energy storage systems, such as i) transparent and flexible energy storage systems, ii) origami-type electrodes by a patterning approach, iii) omnidirectional stretchable electrodes, and iv) dual planar-helix type wire electrodes. These concepts of new-type electrode architectures can provide noteworthy implications across a number of disciplines toward ultimate energy storage, power supply and stretchable devices for the next generation of electronics.
A series of silica-supported transition metal phosphate catalysts was tested in the partial oxidation of methane using an X+O2/AO system at moderate temperatures. It was found that iron group metal (Fe, Ni, Cu) phosphates were effective partial CH4 oxidation catalysts, and that the use of the X+O2/AO system led to higher catalytic formaldehyde production rates than have been previously reported for CH4 oxidation by O2. Catalysts with different phosphorus contents were prepared and tested to ascertain its effect on reactivity. Contact time and partial pressure dependency measurements on the best catalysts were used to derive a plausible reaction sequence.
Preparation of Ag2O nanoparticle decorated hierarchical TiO2 nanostructures was realised in this study by employing the facile hydrothermal method, which involved use of double comb copolymer-templated sol-gel and a chemical bath. The synthesized Ag2O@HNR nanostructures demonstrated a photocurrent density of 1.78 mA/cm2 at 1.23 V against RHE under an illumination of 1 sun. This observed value of photocurrent density exceeded that of pristine TiO2 nanorods by 2.18 times.
Ammonia can be catalytically decomposed into N2 and H2 as follows; 2NH3 -> N2 + 3H2 ΔHo = +46 kJ mol-1.However, associative desorption step of N atoms is known as the rate-limiting step in this catalysis, and these adsorbed N atoms work to block active sites at low temperature. This step seems to be influenced by the catalyst basicity. Therefore, this study has introduced the MAl2O4 supports that have different basicity and investigated on how basicity of support affects the ammonia decomposition reaction and the associative desorption step of N atoms.
フランジ接手は溶接接手と同様に内部流体を密封する性能が要求されるが、作業者の技術・技能レベルには明確な規定がない。弊社では10年前からフランジ締結作業の安全・品質に関する指導ができる監督者を育成するために「フランジ締結管理技術者」社内認定資格を制定し、体験型の教育を行ってきた。一方、作業者向けの教育は現場毎に行われているが、座学中心でその内容も現場に任されていた。本稿は、昨年発刊された「フランジ締結作業トレーニング指針」（HPI TR Z 110:2018）に準拠した作業者向け教育の標準化に関する取組みを紹介する。