“…Despite this, support/diluted-or dopant/promoter-induced effects, which provoke such a selectivity shift towards ethylene formation, are still unclear. For instance, a decrease in the electrical conductivity, [27,28] the reduction of NiO crystallite size, [29,30] generation of defects, [25,30] , or the elimination of non-selective oxygen species [25,31] have been claimed as common effects that increase ethylene selectivity in the ODH of ethane, for both promoted and supported/diluted NiO catalysts.…”