Mid-temperature CO Adsorption over Different Alkaline Sorbents Dispersed over Mesoporous AlO.

CO adsorbents comprising various alkaline sorption active phases supported on mesoporous AlO were prepared. The materials were tested regarding their CO adsorption behavior in the mid-temperature range, i.e.

CO Physisorption over an Industrial Molecular Sieve Zeolite: An Experimental and Theoretical Approach.

The present work studies the adsorption of CO using a zeolitic industrial molecular sieve (IMS) with a high surface area. The effect of the CO feed concentration and the adsorption temperature in conjunction with multiple adsorption-desorption cycles was experimentally investigated. To assess the validity of the experimental results, theoretical calculations based on well-established equations were employed and the values of equilibrium, kinetic, and thermodynamic parameters are presented.

In-situ microbial protein production by using nitrogen extracted from multifunctional bio-electrochemical system.

Upgrading of waste nitrogen sources is considered as an important approach to promote sustainable development. In this study, a multifunctional bio-electrochemical system with three chambers was established, innovatively achieving 2.02 g/L in-situ microbial protein (MP) production via hydrogen-oxidizing bacteria (HOB) in the protein chamber (middle chamber), along with over 2.

Different reactor configurations for enhancement of CO methanation.

Greenhouse gas emissions are a massive concern for scientists to minimize the effect of global warming in the environment. In this study, packed bed, coated wall, and membrane reactors were investigated using three novel nickel catalysts for the methanation of CO. CFD modelling methodologies were implemented to develop 2D models.

Activity and Thermal Aging Stability of LaSrMnO (x = 0.0, 0.3, 0.5, 0.7) and Ir/LaSrMnO Catalysts for CO Oxidation with Excess O.

The catalytic oxidation of CO is probably the most investigated reaction in the literature, for decades, because of its extended environmental and fundamental importance. In this paper, the oxidation of CO on LaSrMnO perovskites (LSMx), either unloaded or loaded with dispersed Ir nanoparticles (Ir/LSMx), was studied in the temperature range 100-450 °C under excess O conditions (1% CO + 5% O). The perovskites, of the type LaSrMnO (x = 0.

Nanoparticle Exsolution from Nanoporous Perovskites for Highly Active and Stable Catalysts.

Nanoporosity is clearly beneficial for the performance of heterogeneous catalysts. Although exsolution is a modern method to design innovative catalysts, thus far it is predominantly studied for sintered matrices. A quantitative description of the exsolution of Ni nanoparticles from nanoporous perovskite oxides and their effective application in the biogas dry reforming is here presented.

Carbon Nanostructure/Zeolite Y Composites as Supports for Monometallic and Bimetallic Hydrocracking Catalysts.

In this study, we examine the effect of integrating different carbon nanostructures (carbon nanotubes, CNTs, graphene nanoplatelets, GNPs) into Ni- and Ni-W-based bi-functional catalysts for hydrocracking of heptane performed at 400 °C. The effect of varying the SiO2/Al2O3 ratio of the zeolite Y support (between 5 and 30) on the heptane conversion is also studied. The results show that the activity, in terms of heptane conversion, followed the order CNT/Ni-ZY5 (92%) > GNP/Ni-ZY5 (89%) > CNT/Ni-W-ZY30 (86%) > GNP/Ni-W-ZY30 (85%) > CNT/Ni-ZY30 (84%) > GNP/Ni-ZY30 (83%).

Efficient degradation of organic compounds in landfill leachate via developing bio-electro-Fenton process.

Efficient and harmless disposal of landfill leachate has attracted increasing attention. In this study, the bio-electro-Fenton method was investigated and developed to degrade the organic compounds in landfill leachate by hydroxyl radical oxidation. The optimal operational parameters (i.

Bimetallic Exsolved Heterostructures of Controlled Composition with Tunable Catalytic Properties.

In this paper, we show how the composition of bimetallic Fe-Ni exsolution can be controlled by the nature and concentration of oxygen vacancies in the parental matrix and how this is used to modify the performance of CO-assisted ethane conversion. Mesoporous A-site-deficient LaSrTiFeNiO (0 ≤ α ≤ 0.2) perovskites with substantial specific surface area (>40 m/g) enabled fast exsolution kinetics ( < 500 °C, < 1 h) of bimetallic Fe-Ni nanoparticles of increasing size (3-10 nm).

Calcium ion can alleviate ammonia inhibition on anaerobic digestion via balanced-strengthening dehydrogenases and reinforcing protein-binding structure: Model evaluation and microbial characterization.

Experimental investigation and model simulation was combined to identify the effect of metal ions on mitigating ammonia inhibition during anaerobic digestion. Five metal ions (Ca, Mg, Cu, Zn, Fe) were tested in reactors with 1 g-glucose/L/d and 5 g-N/L under fed batch operation. Ca addition was considered the optimal approach with a 25% increment in methane production via balanced-strengthening dehydrogenases and reinforcing protein-binding structure.

Selective Catalytic Reduction of NO over Perovskite-Based Catalysts Using CH(O), H and CO as Reducing Agents-A Review of the Latest Developments.

Selective catalytic reduction (SCR) is probably the most widespread process for limiting NO emissions under lean conditions (O excess) and, in addition to the currently used NH or urea as a reducing agent, many other alternative reductants could be more promising, such as CH/CHO, H and CO. Different catalysts have been used thus far for NO abatement from mobile (automotive) and stationary (fossil fuel combustion plants) sources, however, perovskites demand considerable attention, partly due to their versatility to combine and incorporate various chemical elements in their lattice that favor deNO catalysis. In this work, the CH/CHO, H, and CO-SCR of NO on perovskite-based catalysts is reviewed, with particular emphasis on the role of the reducing agent nature and perovskite composition.

Bioaugmentation with well-constructed consortia can effectively alleviate ammonia inhibition of practical manure anaerobic digestion.

Bioaugmentation is an attractive method to improve methane production (MP) in the anaerobic digestion (AD) process. In this study, to tackle the ammonia inhibition problem, a long-term (operating over 6 months) acclimatized consortia and a well-constructed consortia were selected as the bioaugmentation consortia for sequencing batch AD reactors fed with dairy manure and pig manure under mesophilic condition. Similar responses, in terms of the reactor performance and microorganisms structure to the different consortia, were observed with both manure kinds indicating that the effectiveness of bioaugmentation was mainly decided by the composition of the added consortia, not the feedstock.

Adsorption of Hydrogen Sulfide at Low Temperatures Using an Industrial Molecular Sieve: An Experimental and Theoretical Study.

In the work presented herein, a joint experimental and theoretical approach has been carried out to obtain an insight into the desulfurization performance of an industrial molecular sieve (IMS), resembling a zeolitic structure with a morphology of cubic crystallites and a high surface area of 590 m g, with a view to removing HS from biogas. The impact of temperature, HS inlet concentration, gas matrix, and regeneration cycles on the desulfurization performance of the IMS was thoroughly probed. The adsorption equilibrium, sorption kinetics, and thermodynamics were also examined.

Methane production from acetate, formate and H/CO under high ammonia level: Modified ADM1 simulation and microbial characterization.

This study evaluated the methanogenic performance of typical substrates (acetate, formate, H/CO, and glucose) under low and high ammonia levels and the Anaerobic Digestion Model No.1 (ADM1) was extended and modified for better simulation and understanding of the process. Formate-utilizing and hydrogen-utilizing methanogenesis showed stronger ammonia resistance than acetate-utilizing methanogenesis (13-23% vs.

Continuous selective deoxygenation of palm oil for renewable diesel production over Ni catalysts supported on AlO and LaO-AlO.

The present study provides, for the first time in the literature, a comparative assessment of the catalytic performance of Ni catalysts supported on γ-AlO and γ-AlO modified with LaO, in a continuous flow trickle bed reactor, for the selective deoxygenation of palm oil. The catalysts were prepared the wet impregnation method and were characterized, after calcination and/or reduction, by N adsorption/desorption, XRD, NH-TPD, CO-TPD, H-TPR, H-TPD, XPS and TEM, and after the time-on-stream tests, by TGA, TPO, Raman and TEM. Catalytic experiments were performed between 300-400 °C, at a constant pressure (30 bar) and different LHSV (1.

Bimetallic Ni-Based Catalysts for CO Methanation: A Review.

CO methanation has recently emerged as a process that targets the reduction in anthropogenic CO emissions, via the conversion of CO captured from point and mobile sources, as well as H produced from renewables into CH. Ni, among the early transition metals, as well as Ru and Rh, among the noble metals, have been known to be among the most active methanation catalysts, with Ni being favoured due to its low cost and high natural abundance. However, insufficient low-temperature activity, low dispersion and reducibility, as well as nanoparticle sintering are some of the main drawbacks when using Ni-based catalysts.

Hydrogen Sulfide (HS) Removal via MOFs.

The removal of the environmentally toxic and corrosive hydrogen sulfide (HS) from gas streams with varying overall pressure and HS concentration is a long-standing challenge faced by the oil and gas industries. The present work focuses on HS capture using a relatively new type of material, namely metal-organic frameworks (MOFs), in an effort to shed light on their potential as adsorbents in the field of gas storage and separation. MOFs hold great promise as they make possible the design of structures from organic and inorganic units, but also as they have provided an answer to a long-term challenging objective, i.