## 1 Introduction  
The phenomenon of stratification is the result of concentrations and temperature variations or fluid having different densities. Stratification is an essential phenomenon in terms of heat and mass transfer. Thermal stratification in reservoirs such as oceans, rivers, groundwater helps in reducing the amalgamation of water and oxygen. Stratification plays a major role in keeping a balance between hydrogen and oxygen to rationalize the breeding of species. [PERSON] et al. [1] discussed double stratification on an inclined stretched cylinder with a chemical reaction on a Jeffery magnetic nanofluid. [PERSON] et al. [2] investigated the results of thermal stratification with Cattaneo-Christov (CC) heat flux on a stretching flow. [PERSON] et al. [3] examined a mixed convection flow with the impact of thermal stratification on a stretching cylinder. [PERSON] et al. [4] inspected natural convection on cylinders and isothermal spheres immersed in a stratified fluid. [PERSON] et al. [5] analyzed the thermal stratification effect in a fluid that was saturated in a porous enclosure with free convection. Many scholars have shown a huge interest in stratification, as cited in [6; 7; 8; 9; 10; 11; 12]. Chemical reactions have extensive applications and are categorized as homogeneous-heterogeneous (hh) reactions. Some reactions progress slowly, so a catalyst plays a key role in enhancing the rate of a chemical reaction. The relation shared by hh reactions is somewhat perplexing. As the rate of fabrication and incineration of reactant species fluctuates with time. Chemical reactions have a wide range of applications such as the formation of fog, the assembly of ceramics, polymers, crop damage through freezing, and the orchards of fruit trees. There has been extensive research that has discussed hh reactions, including that by [PERSON] et al. [13], who examined the influence of hh reactions with CC heat flux on an magneto hydro dynamic (MHD) 3D Maxwell fluid with convective boundary conditions. [PERSON] et al. [14] reported CC heat flux on the unsteady flow of a nanofluid with hh reactions. [PERSON] et al. [15] numerically studied hh reactions past a stretched cylinder with Newtonian heating and their impact on a silver-water nanofluid. More research on hh reactions is mentioned in [16; 17; 18; 19; 20; 21; 22]. A fluid flow through a porous medium is of extreme significance due to its appearance in the movement of water in reservoirs, the processing of mines and minerals, agriculture, the petroleum industry, the production of oil and gas, the insulation of thermal processes, and cooling reactors. Enormous problems involving porous mediums have been described with classical [PERSON]'s theory [23]. [PERSON]'s expression is only applicable to situations of small velocity and low porosity, as it lacks the capability of dealing with inertia and boundary effects at a high flow rate. Flows with a Reynold number (>1) are non-linear due to their higher velocities. The impact of inertia and boundary layer cannot be neglected, as a porous medium mostly involves relatively higher velocities. [PERSON] [24] added the term of square velocity in order to make [PERSON]'s law more conveniently applicable. [PERSON] [25] later recognized this term as [PERSON]'s term. [PERSON] et al. [26] examined a numerical study of the Darcy-Forchheimer (DF) flow with slip condition of the momentum of order two and chemically reactive species. [PERSON] et al. [27] scrutinized a thermally stratified porous medium on a stretching/shrinking surface with a DF flow and a second-order slip on a hydromagnetic nanofluid. [PERSON] et al. [28] detected a DF flow with a CC heat flux in a viscoelastic fluid with a porous medium. Recent research works involving the Darcy flow include [29; 30]. In many physical problems, variable source/sink plays an important role in controlling the transfer of heat. [PERSON] et al. [31] perceived the transfer of heat and mass on a chemically reacting Casson fluid with variable heat source/sink on an occupied MHD boundary layer.