Enhancement of chlorine on Pd catalyst for H2O2 in-situ synthesis in electro-Fenton system: Kinetics and Mechanism

Palladium-based catalyst has been widely employed in electro-Fenton process for in-situ generation of H2O2. However, the selectivity to H2O2 achieved so far is still far below application level. In this work, a series of Cl-FePd/γ-Al2O3/Al catalysts were prepared by a three-step-impregnation method, exhibiting excellent activity in H2O2 in-situ synthesis and high efficiency in phenol degradation. The characterization results showed that the Cl could assist in increasing the content of Pd0 and reducing the isoelectric point of catalyst, leading to the dramatic promotion in synthesis of H2O2. Moreover, theoretical calculation and kinetics further demonstrated that the Cl doping could facilitate the main reaction in H2O2 synthesis, as well as inhibit side reactions, including the dissociation of O-O bond, hydrogenation and decomposition. Furthermore, plausible mechanism and degradation pathways were elaborated based on ESR and GC-MS results. These findings illustrate the value of palladium-based Cl-FePd/γ-Al2O3/Al catalyst in its application in electro-Fenton process.

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Influence of Casting Solvents on CO2/CH4 Separation Using Polysulfone Membranes

Membranes ◽

10.3390/membranes11040286 ◽

2021 ◽

Vol 11 (4) ◽

pp. 286

Author(s):

Roba M. Almuhtaseb ◽

Ahmed Awadallah-F ◽

Shaheen A. Al-Muhtaseb ◽

Majeda Khraisheh

Keyword(s):

High Efficiency ◽

In Situ Synthesis ◽

Separation Process ◽

Polymeric Membranes ◽

Gas Mixture ◽

Manufacturing Cost ◽

Binary Gas Mixture ◽

Maximum Permeability ◽

Polysulfone Membranes

Polysulfone membranes exhibit resistance to high temperature with low manufacturing cost and high efficiency in the separation process. The composition of gases is an important step that estimates the efficiency of separation in membranes. As membrane types are currently becoming in demand for CO2/CH4 segregation, polysulfone will be an advantageous alternative to have in further studies. Therefore, research is undertaken in this study to evaluate two solvents: chloroform (CF) and tetrahydrofuran (THF). These solvents are tested for casting polymeric membranes from polysulfone (PSF) to separate every single component from a binary gas mixture of CO2/CH4. In addition, the effect of gas pressure was conducted from 1 to 10 bar on the behavior of the permeability and selectivity. The results refer to the fact that the maximum permeability of CO2 and CH4 for THF is 62.32 and 2.06 barrer at 1 and 2 bars, respectively. Further, the maximum permeability of CF is 57.59 and 2.12 barrer at 1 and 2 bars, respectively. The outcome selectivity values are 48 and 36 for THF and CF at 1 bar, accordingly. Furthermore, the study declares that with the increase in pressure, the permeability and selectivity values drop for CF and THF. The performance for polysulfone (PSF) membrane that is manufactured with THF is superior to that of CF relative to the Robeson upper bound. Therefore, through the results, it can be deduced that the solvent during in-situ synthesis has a significant influence on the gas separation of a binary mixture of CO2/CH4.

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In-situ synthesis of highly dispersed Cu-CuxO nanoparticles on porous carbon for the enhanced persulfate activation for phenol degradation

Separation and Purification Technology ◽

10.1016/j.seppur.2021.119260 ◽

2021 ◽

pp. 119260

Author(s):

Xinyu Li ◽

Xiaobo Min ◽

Xiaoxian Hu ◽

Zhi Jiang ◽

Chaofang Li ◽

...

Keyword(s):

Porous Carbon ◽

Phenol Degradation ◽

In Situ Synthesis ◽

Highly Dispersed ◽

Persulfate Activation

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In situ synthesis of MoS2/graphene nanosheets as free-standing and flexible electrode paper for high-efficiency hydrogen evolution reaction

RSC Advances ◽

10.1039/c8ra01226a ◽

2018 ◽

Vol 8 (19) ◽

pp. 10698-10705 ◽

Cited By ~ 15

Author(s):

Xianghui Zhang ◽

Mingguang Zhang ◽

Yiqun Tian ◽

Jing You ◽

Congxing Yang ◽

...

Keyword(s):

Hydrogen Evolution ◽

Hydrogen Evolution Reaction ◽

High Efficiency ◽

Graphene Nanosheets ◽

In Situ Synthesis ◽

Solvothermal Process ◽

Free Standing ◽

Flexible Electrode ◽

One Step

An improved flexible hybrid MoS2/graphene free-standing electrocatalyst paper was fabricated by a one-step in situ solvothermal process for hydrogen evolution reaction applications.

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