Synthesis of Catalytic Ni/Cu Nanoparticles from Simulated Wastewater on Li–Al Mixed Metal Oxides for a Two-Stage Catalytic Process in Ethanol Steam Reforming: Catalytic Performance and Coke Properties

This work recovered Ni or Cu cations from simulated electroplating wastewater to synthesize Ni/Cu nano-catalysts for H2 generation by ethanol steam reforming (ESR). Aluminum lathe waste was used as a framework to prepare the structured catalyst. Li–Al–CO3 layered double hydroxide (LDH) was electrodeposited on the surface of the framework. The LDH was in a platelet-like structure, working as a support for the formation of the precursor of the metal catalysts. The catalytic performance and the coke properties of a 6Cu_6Ni two-stage catalyst configuration herein used for ESR catalytic reaction were studied. The Cu–Ni two-stage catalyst configuration (6Cu_6Ni) yielded more H2 (~10%) than that by using the Ni-based catalyst (6Ni) only. The 6Cu_6Ni catalyst configuration also resulted in a relatively stable H2 generation rate vs. time, with nearly no decline during the 5-h reaction. Through the pre-reaction of ethanol-steam mixture with Cu/LiAlO2 catalyst, the Ni/LiAlO2 catalyst in the 6Cu_6Ni catalyst configuration could steadily decompose acetaldehyde, and rare acetate groups, which would evolve condensed coke, were formed. The Ni nanoparticles were observed to be lifted and separated by the carbon filaments from the support and had no indication of sintering, contributing to the bare deactivation of the Ni/LiAlO2 catalyst in 6Cu_6Ni.

Tekstil Takviyeli Beton Üretiminde Kullanılmak Üzere Yüksek Performanslı Hibrit İplik Geliştirilmesi Ve Üretim Parametrelerinin Optimizasyonu

Textile-Reinforced Concrete (TRC) is a new construction material and has been used in civil engineering applications such as façade systems, sandwich panel and outside furniture during the past several decades. Generally in TRC, glass, carbon filaments, etc. are used to reinforce concrete because these high-performance filaments have superior mechanical properties and corrosion resistance. Coating of these filaments with different polymers provide extra performance for TRC’s durability. But, because of coating materials’ cost and stiffness, using of coating for TRC is not so advantageous. For these reasons, new approaches are needed. In this study, a new hybrid yarn design and production for TRC are emphasized. AR-Glass and polypropylene filament were used for production of hybrid yarn by commingling method. It was aimed to optimize the parameters of commingling yarn production with Taguchi orthogonal design. The experiments were performed by using L9 orthogonal matrix with respect to Taguchi approach. The best strength value in the study was obtained in production parameters where the machine production speed is 50 m / min, the air pressure is 6 bar and the feeding amount is 2%. Analysis of variance (ANOVA) and signal/noise ratio were used to evaluate the experiment results. As a result of the analysis, it has been observed that the machine production speed has the greatest effect on the breaking strength and the feed amount has the lowest effect.

The effect of the addition of carbon nanoparticles and methods for combining them with an epoxy matrix on the properties of polymeric composite materials

The influence of the methods of introducing carbon nanoparticles into the epoxy binder and their amount on the complex of physicomechanical characteristics of unidirectional organic and carbon plastics was evaluated. An increase in the breaking load in microplastic made of carbon filaments up to 86% due to the introduction of nanoparticles is shown. An increase in the compressive strength of unidirectional carbon-fiber specimens modified with nanoparticles using a wave machine, up to 32% in comparison with unmodified, has been established.

Repair and Rehabilitation of RCC Beam using Synthetic Fiber Material

Retrofitting is the alteration of existing structures to make them continuously impenetrable to seismic development, ground development, etc. A large number of the current strengthened solid structures all through the world are in pressing need of recovery, fix or reproduction in light of crumbling because of different factors like consumption, absence of itemizing, disappointment of holding between pillar segment joints and so on. Fiber Reinforced Polymer (FRP) composite has been acknowledged in the development business as a promising substitute for fixing and in augmenting the quality of Reinforced concrete structures. This paper exhibits a test study on fortified solid shafts retrofitted with different kinds of filaments remotely. The goal of this examination is to explore the conduct of shafts in the wake of retrofitting utilizing different normal and engineered filaments including steel strands, polypropylene strands, glass filaments, Basalt filaments, carbon filaments and so forth.