Grigoriy Yablonsky (or Yablonskii) (Russian: Григорий Семенович Яблонский) is an expert in the area of chemical kinetics and chemical engineering, particularly in catalytic technology of complete and selective oxidation, which is one of the main driving forces of sustainable development.

His theory of complex steady-state and non-steady-state catalytic reactions[1] is widely used by research teams in many countries of the world (the USA, UK, Belgium, Germany, France, Norway, and Thailand).

[2] Yablonsky also created a theory of precise catalyst characterization for the advanced worldwide experimental technique (temporal analysis of products) developed by John T. Gleaves at Washington University in St.

[3] In 2008–2011, Yablonsky, together with Constales and Marin (Ghent University, Belgium), and Alexander Gorban (University of Leicester, UK), obtained new results on coincidences and intersections in kinetic dependences and found a new type of symmetry relation between the observable and initial kinetic data.

[4][5][6] Together with Alexander Gorban, Yablonsky developed the theory of chemical thermodynamics and detailed balance in the limit of irreversible reactions.

[7][8] A simple scheme for the nonlinear kinetic oscillations in heterogeneous catalytic reactions has been proposed by Bykov, Yablonsky, and Kim in 1978.

Then they have supplemented this classical adsorption mechanism of catalytic oxidation by a "buffer" step Here, A2, B, and AB are gases (for example, O2, CO, and CO2), Z is the "adsorption place" on the surface of the solid catalyst (for example, Pt), AZ and BZ are the intermediates on the surface (adatoms, adsorbed molecules, or radicals), and (BZ) is an intermediate that does not participate in the main reaction.

Then the law of mass action gives for this reaction mechanism a system of three ordinary differential equations that describe kinetics on the surface.

The detailed analysis shows that there are 23 different phase portraits for this system, including oscillations, multiplicity of steady states, and various types of bifurcations.

[14] This quasithermodynamic property of the systems without interaction of different components is important for the analysis of the dynamics of catalytic reactions: nonlinear steps with two (or more) different intermediate reagents are responsible for nontrivial dynamical effects like multiplicity of steady states, oscillations, or bifurcations.

Without interaction between different components, the kinetic curves converge into a simple norm, even for open systems.

The detailed mechanism of many real physico-chemical complex systems includes both reversible and irreversible reactions.

Such mechanisms are typical in homogeneous combustion, heterogeneous catalytic oxidation, and complex enzyme reactions.

The classical thermodynamics of perfect systems is defined for reversible kinetics and has no limit for irreversible reactions.

[8] On the contrary, the mass action law gives the possibility to write the chemical kinetic equations for any combination of reversible and irreversible reactions.

Without additional restrictions, this class of equations is extremely wide and can approximate any dynamical system with preservation of positivity of concentrations and the linear conservation laws.

[7] The extended principle of detailed balance is the characteristic property of all systems that obey the generalized mass action law and is the limit of systems with detailed balance when some of the reaction rate constants tend to zero (the Gorban-Yablonsky theorem).

From 1997 to 2007, Yablonsky was a research associate professor in the department of energy, environmental, and chemical engineering at Washington University in St. Louis.

Since 2007, Yablonsky has been an associate professor at Saint Louis University's Parks College of Engineering, Aviation, and Technology as well as in the department of chemistry.

Yablonsky frequently participates in interdisciplinary dialogues involving mathematicians, chemists, physicists, and chemical engineers.

[vague] Yablonsky was selected in 2013 for the James B. Eads Award,[16][17] which recognizes a distinguished individual for outstanding achievement in engineering or technology.

Yablonsky has numerous international designations as an honorary professor, fellow, doctor, and member of prestigious science academies and universities in Belgium, India, China, Russia, and Ukraine.

Kinetics of Chemical Reactions: Decoding Complexity Wiley-VCH (2011) (together with Guy B. Marin), and more than 200 papers.