H2SCR™ replaces delivered DEF with on-demand ammonia synthesis at the point of use — cutting logistics, eliminating storage, and achieving NOx reductions equivalent to traditional SCR systems. CO₂-free when paired with green hydrogen.
Every conventional SCR system depends on a continuous external supply of DEF or bulk ammonia — creating ongoing cost, complexity, and risk that H2SCR™ eliminates entirely.
H2SCR™ produces ammonia on site from hydrogen and nitrogen, then injects it into a conventional SCR catalyst — the same proven NOx chemistry, without the supply chain.
Hydrogen is generated via electrolysis, reforming, biomass, or sourced from existing industrial supply.
Nitrogen is extracted from ambient air or existing industrial gas systems — no cryogenic storage needed.
H₂ and N₂ are catalytically combined on demand at the point of use. No DEF, no bulk ammonia, no logistics.
Ammonia is injected into the SCR catalyst, converting NOx to clean nitrogen and water vapor — 90%+ efficiency.
H2SCR™ is designed for integration into existing and new equipment wherever NOx control is required.
Data centers, hospitals, emergency backup, and industrial gensets — high operating hours, high DEF consumption.
Cement plants, refineries, chemical plants, and manufacturing with continuous emissions obligations.
Municipal wastewater treatment, pumping stations, and utility backup generation.
Vessel engines facing tightening IMO NOx Tier III requirements and zero-tolerance port emissions zones.
Combined heat and power systems, microgrid operators, and distributed energy resources in regulated zones.
Remote operations where DEF logistics are especially costly, complex, and supply-chain constrained.
H2SCR™ is hydrogen-source agnostic. The four most commercially attractive pathways for stationary applications are below.
Uses natural gas, propane, diesel vapor, or RNG already on site. Lowest cost pathway with proven technology.
Produces the highest purity hydrogen from water and electricity. Zero point-source emissions when powered by renewables.
Very high efficiency electrolysis using waste steam. Ideal where heat is already available on site.
Converts exhaust NOx into the ammonia reagent itself — a fully circular NOx reduction architecture.
Major commercial and emerging pathways by feedstock, purity, CO₂ impact, and commercial readiness.
| Method | Feedstock | H₂ Purity | CO₂ Emissions | Status |
|---|---|---|---|---|
| Steam Methane Reforming (SMR) | Natural Gas | 99.9%+ | High | Commercial |
| SMR + Carbon Capture (Blue H₂) | Natural Gas | 99.9%+ | Medium | Commercial |
| Alkaline Electrolysis | Water | 99.5–99.99% | Grid-dependent | Commercial |
| PEM Electrolysis | Water | 99.99%+ | Near zero* | Commercial |
| Solid Oxide Electrolysis (SOEC) | Steam | 99.9%+ | Near zero* | Emerging |
| Biomass Gasification | Biomass | 95–99.9% | Low to negative | Emerging |
| Biogas Reforming | Biogas / RNG | 99.9%+ | Low | Commercial |
| Methane Pyrolysis | Natural Gas | 99.9%+ | Very low | Emerging |
| Ammonia Cracking | NH₃ | 99.9–99.999% | Low | Growing |
| Coal Gasification | Coal | 99.9%+ | Very high | Declining |
* When powered by renewable electricity.
H2SCR™ operates at the intersection of climate technology, industrial emissions control, hydrogen, ammonia, and advanced hard-tech infrastructure.
Technology that addresses climate and environmental challenges by reducing emissions, improving efficiency, or enabling cleaner energy. H2SCR™: Reduces NOx emissions and can potentially reduce the environmental footprint associated with DEF logistics.
Technologies that help heavy industry, power generation, transportation, and manufacturing reduce greenhouse-gas emissions. H2SCR™: Enables cleaner operation of combustion-based power systems and can integrate low-carbon hydrogen.
Physical technology requiring engineering, hardware, manufacturing, testing, and real-world deployment. H2SCR™: Combines ammonia generation, SCR, sensors, controls, and physical emissions-control equipment.
Technology based on significant scientific or engineering innovation that can be difficult to replicate and often requires substantial R&D. H2SCR™: Combines hydrogen/ammonia chemistry, emissions engineering, controls, and system integration.
Technologies that produce, store, manage, or enable energy with lower environmental impact. H2SCR™: Can use hydrogen produced from low-carbon energy sources to support emissions control.
Hardware and software designed to improve industrial processes, equipment, efficiency, safety, or performance. H2SCR™: Provides an industrial emissions-control system for engines and generators.
Energy produced or managed close to where it is consumed rather than exclusively at centralized power plants. H2SCR™: Can be deployed at distributed generators, microgrids, data centers, and onsite power systems.
Technologies that capture, convert, or prevent pollutants from entering the atmosphere. H2SCR™: Uses ammonia and SCR chemistry to convert NOx into primarily nitrogen and water.
A clean-energy carrier that can be produced from various feedstocks and used in industrial, energy, transportation, and chemical applications. H2SCR™: Uses hydrogen as a feedstock for on-demand ammonia production.
NH₃ is an important industrial chemical and a key reagent for SCR emissions-control systems. H2SCR™: Potentially produces ammonia on demand instead of relying on delivered DEF.
Next-generation manufacturing using sophisticated processes, automation, materials, controls, and system integration. H2SCR™: Can involve modular ammonia-generation equipment, automated dosing, sensors, controls, and packaged emissions systems.
Physical systems and equipment required to support essential economic activity and services. H2SCR™: Can become emissions-control infrastructure for generators, data centers, microgrids, marine engines, and industrial power systems.
CMXI.org is the commercialization partner for H2SCR™ and is currently accepting OEM licensing inquiries. Generator, engine, and emissions control manufacturers are invited to discuss integration.
Email Daniel Wells — daniel@cmxi.org