By rational assembly of Zn(2+) and Cu(2+) with G, three metallogels (ZnG, CuG and Zn-CuG) were prepared. The gelation was controlled by the presence of specific anions, with their efficacy linked to the Hofmeister series. Zn-CuG could fluorescently detect CN(-) with specific selectivity over S(2-) and Cys through the competitive coordination of CN(-) and G with Cu(2+).

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Ammonia as a fuel can be a carbon-free and longduration scalable hydrogen energy carrier. In the carbon-neutral power system, co-firing ammonia with natural gas is a promising technique for flexible operations of gas turbines and gas-fired boilers. However, the NO x propensity of ammonia/methane flames is a severe problem under global fuel-lean conditions. This work has investigated the NO x performance of various fueloxidizer mixing strategies on a tangential swirl burner. We propose a new ammonia co-combustion technology with a central ammonia jet surrounded by a group of separately tangential swirl methane jets. The NO x emissions can be reduced to about 1000 ppm under lean combustion conditions (global Φ = 0.5−0.9) when the ammonia blending ratio (E NH3 , in terms of input energy) is 20% (corresponding to the ammonia molar fraction x NH3 as 0.41). Regarding the NO x emissions and ammonia slip at the tube exit, such a strategy outperforms other feed modes for a wide range of ammonia blending ratios (E NH3 up to 0.3 and x NH3 up to 0.52) and equivalence ratios (Φ ranging from 0.5 to 1.1). The variations of emitted NO x with the total flow rate and the axial position of ammonia injection were also studied. Combining measurements of gaseous temperature, composition, and NH 2 * chemiluminescence, we demonstrated the massive formation of NH 2 radicals in the central high-temperature ammonia-rich zone. A model involving the chemical reaction network was developed and validated against the experiments. It provides further evidence for the role of NH 2 radicals in reducing NO x emission.