Enhancement of hydrogen production using Ni catalysts supported by Gd-doped ceria.

A redox cycle between Ce and Ce is an elementary step in water gas shift (WGS) mechanism. By facilitating the redox cycle between +4 and +3 of cerium, a formation of oxygen vacancy can be enhanced. It is considered to be a dominating factor in developing the WGS performance and the stability of ceria in this work.

Inorganic nitrogen control in a novel zero-water exchanged aquaculture system integrated with airlift-submerged fibrous nitrifying biofilters.

This work examined the feasibility of applying shrimp diets to establish nitrification on submerged fibrous biofilters. It also investigated the performance of a proposed zero-water exchanged aquaculture system, which integrated growing of aquatic stocks and operation of acclimated biofilters in the same environment. Addition of shrimp diets fully established nitrification within 3 weeks as indicated by continuous increase of nitrate and trivial levels of ammonium and nitrite.