chemical-precipitation-method-for-synthesis-nb2o5-modified-bulk

Chemical Precipitation Method for the Synthesis of Nb<sub>2</sub>O<sub>5</sub> Modified Bulk Nickel Catalysts with High Specific Surface Area

We demonstrate a method for the synthesis of NixNb1-xO catalysts with sponge-like and fold-like nanostructures. By varying the Nb:Ni ratio, a series of ...

tuning-acidity-pt-cnts-catalysts-for-hydrodeoxygenation-diphenyl

Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether

We herein present a method for the synthesis of HNbWO6, HNbMoO6, HTaWO6 solid acid nanosheet modified Pt/CNTs. By varying the weight of various solid acid ...

synthesis-metal-nanoparticles-supported-on-carbon-nanotube-with-doped

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

A method for facile synthesis of nanostructured catalysts supported on carbon nanotubes with atomically dispersed cobalt and nitrogen dopant is presented ...

Technological and Higher Education Institute of Hong Kong

Technological and Higher Education Institute of Hong Kong (THEi)

Effective utilization of coal bed methane is very significant for energy utilization and environment protection. Catalytic combustion of methane is a promising way to eliminate trace amounts of oxygen in the coal bed methane and the key to this technology is the development of high-efficiency catalysts. Herein, we report a series of CeLaO(x = 0-0.8) monolithic catalysts for the catalytic combustion of methane, which are prepared by citric acid method. The structural characterization shows that the substitution of La enhance the oxygen vacancy concentration and reducibility of the supports and promote the migration of the surface oxygen, as a result improve the catalytic activity of CeO. M-CeLaO(monolithic catalyst, CeLaOcoated on cordierite honeycomb) exhibits outstanding activity for methane combustion, and the temperature for 10 and 90% methane conversion are 495 and 580 °C, respectively. Additionally, CeLaOmonolithic catalyst presents excellent stability at high temperature. These CeLaOmonolithic materials with a small amount of La incorporation therefore show promises as highly efficient solid solution catalysts for lean-oxygen methane combustion. Graphical abstract ᅟ.

Enhanced activity and stability of La-doped CeOmonolithic catalysts for lean-oxygen methane combustion.

Organic solid wastes (OSWs) should be regarded as valuable resources rather than dead-end landfill waste that causes public health and odor concerns. Anaerobic digestion (AD) is an ideal approach for managing organic solid waste issues and involves using a group of anaerobic microorganisms to transform OSWs into useful products. In this review, over 100 publications related to AD of OSWs have been compiled, discussed, and analyzed. A comprehensive analysis of the environmental and safety impacts of AD, its key environmental factors, co-digestion, and pretreatment, as well as the AD of OSWs by various anaerobic microbes uncovered by high throughput sequencing-based approaches, is presented. The purpose of this review is to provide an outline of the current knowledge of AD processes from a multi-angle perspective. A comprehensive understanding of AD of OSWs and genome-enabled biology development could be helpful for providing up-to-date knowledge of AD, developing it, overcoming its drawbacks and, ultimately, improving global waste control for more efficient environmental management. © 2018 Society of Chemical Industry.

A comprehensive review of anaerobic digestion of organic solid wastes in relation to microbial community and enhancement process.

In this study, hydrothermal synthesis of sea urchin-like NiCoO was successfully demonstrated by a versatile charge-driven self-assembly strategy using positively charged poly(diallydimethylammonium chloride) (PDDA) molecules. Physical characterizations implied that sea urchin-like microspheres of ~ 2.5 μm in size were formed by self-assembly of numerous nanoneedles with a typical dimension of ~ 100 nm in diameter. Electrochemical performance study confirmed that sea urchin-like NiCoO exhibited high reversible capacity of 663 mAh g after 100 cycles at current density of 100 mA g. Rate capability indicated that average capacities of 1085, 1048, 926, 642, 261, and 86 mAh g could be achieved at 100, 200, 500, 1000, 2000, and 3000 mA g, respectively. The excellent electrochemical performances were ascribed to the unique micro/nanostructure of sea urchin-like NiCoO, tailored by positively charged PDDA molecules. The proposed strategy has great potentials in the development of binary transition metal oxides with micro/nanostructures for electrochemical energy storage applications.

Synthesis of Sea Urchin-Like NiCoO via Charge-Driven Self-Assembly Strategy for High-Performance Lithium-Ion Batteries.

With the intensive development of lignocellulosic biorefineries to produce fuels and chemicals from biomass-derived carbohydrates, lignin was generated at a large quantity every year. Therefore, lignin has received increasing attention as an abundant aromatics resource in terms of research and development efforts for value-added chemicals production. In this review, studies about lignin degradation especially the crucial enzymes involved and the reaction mechanism were substantially discussed, which provided the molecular basis of lignin biodegradation. Then, the latest improvements in lignin valorization by biological methods were summarized and case studies about value-added compounds from lignin were introduced. Afterwards, challenges, opportunities and prospects regarding biorefinery of lignin were presented.

Recent advancement in lignin biorefinery: With special focus on enzymatic degradation and valorization.

It is imminent to develop renewable resources to replace fossil-derived energies as fossil resources are on the brink of exhaustion. Lignin is one of the major components of lignocellulosic biomass, which is a natural amorphous three-dimensional polymer with abundant C-O bonds and aromatic structure. Hence, valorization of lignin into high value-added liquid fuels and chemicals is regarded as a promising strategy to mitigate fossil resource shortages. Solid acid catalysts are extensively studied due to environmentally friendly in terms of the ease of separation, recovery and reduced amount of wastes. Hence, this review focuses on summarizing the recent progress of catalytic valorization of lignin over different kinds of solid acid catalysts including zeolites, heteropolyacids, metal oxides, amorphous SiO-AlO, metal phosphates, and Lewis acid. Based on reviewing of current progress of lignin conversion, the challenges and future prospects are emphasized.

A review on high catalytic efficiency of solid acid catalysts for lignin valorization.

This study evaluates the techno-economic feasibility of sophorolipid (SL) production process that co-utilizes food waste, glucose and oleic acid as substrates. Two variables are considered in terms of (a) Plant construction: Purchasing equipment either from the US or Mainland China and (b) Production: to produce SL crystals (about 97% active) or a concentrated SL liquid/syrup (about 78% active). Hence, four scenarios are generated: Scenario I: equipment made in the USA + SL crystals; Scenario II: equipment made in the USA + SL syrup; Scenario III: equipment made in China + SL crystals; Scenario IV: equipment made in China + SL syrup. It is found that all scenarios are economically feasible and Scenario I has the highest net profit. Scenario III has the highest internal rate of return, net present value and the shortest payback period at a 7% discount rate. Finally, comparison of food waste-related techno-economic studies was conducted.

Article Total : 3	Year
Publication title	2018
Publication title	2019
Publication title	2021

Article	Year
Enhanced activity and stability of La-doped CeOmonolithic catalysts for lean-oxygen methane combustion. Environmental science and pollution research international\| PubMed ID: 29222662	2017
A comprehensive review of anaerobic digestion of organic solid wastes in relation to microbial community and enhancement process. Journal of the science of food and agriculture\| PubMed ID: 30144051	2019
Synthesis of Sea Urchin-Like NiCoO via Charge-Driven Self-Assembly Strategy for High-Performance Lithium-Ion Batteries. Nanoscale research letters\| PubMed ID: 30613904	2019
Recent advancement in lignin biorefinery: With special focus on enzymatic degradation and valorization. Bioresource technology\| PubMed ID: 31395402	2019
A review on high catalytic efficiency of solid acid catalysts for lignin valorization. Bioresource technology\| PubMed ID: 31767425
Techno-economic evaluation of a biorefinery applying food waste for sophorolipid production - A case study for Hong Kong. Bioresource technology\| PubMed ID: 32036326

Chi-Wing Tsang

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