What Is Ammonia Used For?

Ammonia is easy to overlook: it may arrive as granules in a fertilizer bag or as a clear, pungent liquid in an industrial tank. Yet this simple nitrogen-and-hydrogen compound supports food production and many everyday materials. The International Energy Agency’s 2021 Ammonia Technology Roadmap reports that about 70% of ammonia is used to make fertilizers. It also estimates that ammonia production accounted for roughly 2% of global final energy consumption and 1.3% of energy-related carbon dioxide emissions in 2020. Those figures reveal both its value and its cost.

The uses extend beyond farms. Manufacturers use ammonia in refrigeration systems, water treatment, and the production of plastics, fibers, and cleaning products. Interest is also growing in ammonia as a way to store and transport hydrogen, though this role remains constrained by safety, cost, and infrastructure requirements. The IEA’s Executive Director, Fatih Birol, has emphasized the need to reduce emissions from ammonia production as demand develops. That is the central tension: ammonia is useful, but conventional production is energy-intensive. The details matter.

This guide examines what ammonia is used for, how those applications work, and where newer uses may fit. It also distinguishes established uses from emerging ones. One caveat is important: global estimates vary by year and by how researchers define production and consumption. A fertilizer sack may be familiar; the energy system behind it is less visible. Understanding both helps readers assess ammonia’s practical value without overlooking its environmental footprint.

What Ammonia Is and How It Is Produced

Ammonia is a compound of nitrogen and hydrogen, with the formula NH₃. At room temperature, it is a colorless gas with a sharp, distinctive smell. It dissolves readily in water, forming an alkaline solution. In nature, small amounts arise as nitrogen-containing material breaks down, but most commercial ammonia is made in industrial plants. The chemistry is familiar; the full process is less simple.

Most production combines nitrogen separated from air with hydrogen, often made from natural gas using steam. A catalyst, high temperatures, and high pressure help the gases react. The ammonia is then cooled, separated, and often stored as a liquid under pressure. Plants recycle unreacted gases, which improves efficiency. Still, this conventional route uses substantial energy and can release carbon dioxide. That detail matters. Some newer approaches use hydrogen made with renewable electricity, though their cost and availability vary. Actual results depend on the energy source and plant design, so “low-carbon” is not automatic. Even a clear chemical equation can hide a complicated supply chain.

How Ammonia Supports Agriculture

Ammonia supports agriculture mainly by supplying nitrogen, an essential nutrient for crop growth. Plants use nitrogen to build proteins and chlorophyll, which helps leaves capture sunlight. Farmers apply ammonia directly in carefully managed forms or use it to produce fertilizers such as urea and ammonium salts. In soil, nitrogen may become available as ammonium or nitrate, which roots can absorb. The exact form and timing matter.

A soil test can help estimate how much nitrogen a field needs. Too little may limit growth; too much can wash into waterways or escape into the air. That matters. Farmers often consider crop type, soil conditions, weather, and the stage of plant growth when planning applications. For example, applying nitrogen close to a crop’s period of rapid growth can improve its chances of uptake, though heavy rain may still move nutrients away from roots.

Ammonia requires careful handling. Anhydrous ammonia is pressurized and can cause severe injury, so its storage and application call for suitable equipment and trained operators. Fertilizer planning is not exact. Fields vary, and even a sound estimate may need adjustment as conditions change. Used thoughtfully, ammonia-based fertilizers help maintain yields while reducing avoidable nutrient losses.

How Ammonia Is Used in Industry and Household Products

Ammonia’s Roles in Refrigeration and Energy Systems

What Is Ammonia Used For?

Ammonia’s Roles in Refrigeration and Energy Systems

In industrial refrigeration, ammonia circulates through pipes and evaporators, absorbing heat from cold rooms and food-processing spaces. It transfers heat efficiently, so systems can deliver strong cooling with relatively little refrigerant. Ammonia also has no ozone-depletion potential and very low direct climate impact when contained. But it is toxic, and leaks demand prompt, practiced responses. Safety is part of the system, not an extra feature.

Energy systems are exploring ammonia as a way to store and transport hydrogen. It can be liquefied more readily than hydrogen, which may simplify some storage and shipping steps. At its destination, ammonia can be used directly in certain energy applications or split into hydrogen and nitrogen. The process takes energy, and combustion can produce nitrogen oxides unless carefully controlled. The idea is useful, but not effortless. Real performance depends on the whole chain, from production to end use. That chain can be easy to overlook.

Tips: In refrigeration facilities, keep leak detectors, ventilation, and emergency procedures maintained. For energy projects, compare conversion losses and emissions across the full supply chain. Small details matter.

Safety and Environmental Considerations in Ammonia Use