Substitute natural gas

Substitute natural gas (SNG), or synthetic natural gas, is a fuel gas (predominantly methane, CH4) that can be produced from fossil fuels such as lignite coal, oil shale, or from biofuels (when it is named bio-SNG) or using electricity with power-to-gas systems.

SNG in the form of liquefied natural gas (LNG) or compressed natural gas (CNG) can be used in road, rail, air and marine transport vehicles as a substitute for costly fuels like diesel and petrol. The carbon footprint of SNG derived from coal is comparable to that of petroleum products. Bio-SNG has a much smaller carbon footprint compared to petroleum products. Liquefied petroleum gas (LPG) can also be produced by synthesising SNG with partial reverse hydrogenation at high pressure and low temperature. LPG is more easily transportable than SNG, more suitable as fuel in two-wheeler or smaller horsepower vehicles and engines, and also fetches higher price in international markets due to short supply.

Renewable electrical energy can also be used to create SNG (methane) via for example electrolysis of water or via a proton-exchange membrane fuel cell (PEMFC) in reverse to create hydrogen, which is then reacted with CO
2 from for example, CSS/U Utilisation in the Sabatier reaction.

2 \+ 4H2 → CH4 \+ 2H2O

## Contents

* 1 Distribution
* 2 Projects
* 3 See also
* 4 References
* 5 External links

## Distribution

It is advantageous to distribute SNG and bio-SNG together with natural gas in a gas grid. In this way, the production of renewable gas can be phased in at the same rate as the production capacity is increased. The gas market and infrastructure the natural gas has contributed is a condition for large scale introduction of renewable biomethane produced through anaerobic digestion (biogas) or gasification and methanation bio-SNG.

## Projects

| Parts of this chemistry (those related to section) need to be updated. Please update this chemistry to reflect recent events or newly available information. (November 2022)

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The Great Plains Synfuels Plant injects approximately 4.1 million m3/day of SNG from lignite coal into the United States national gas grid.[1] The production process of SNG at the Great Plains plant involves gasification, gas cleaning, shift, and methanation. China is constructing nearly 30 nos massive SNG production plants from coal / lignite with aggregate annual capacity of 120 billion standard cubic meters of SNG.[2] SNG can be produced from low rank coal/lignite using hydrogen.[3] When hydrogen is used in place of oxygen/air, the gasification process is called hydrogasification.[4]

## See also

* Landfill gas
* Renewable natural gas
* Oil shale gas
* Power to gas

## References

1. ↑ Dakota Gasification Company. "Gasification". http://www.dakotagas.com/Gasification/index.html.
2. ↑ "China's synthetic natural gas revolution". http://people.duke.edu/~cy42/SNG.pdf.
3. ↑ Sasidhar, Nallapaneni (May 2025). "In-situ and Ex-situ Conversion of Coal to Methane using Hydrogen". Indian Journal of Energy and Energy Resources 4 (3): 1–5. doi:10.54105/ijeer.C1044.04030525. ISSN 2583-1186. https://www.ijeer.latticescipub.com/wp-content/uploads/papers/v4i3/C104404030525.pdf. Retrieved 2025-05-28.
4. ↑ "Conversion of Coal to Substitute Natural Gas (SNG)". https://www.hceco.com/HCEI105001.pdf.

## External links

* SGC Rapport 187 Substitute natural gas from biomass gasification
* SGC-rapport on gasification and methanation

* v
* t
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Fuel gas

Types|

| Manufactured fuel gas
(History)|

* Coal gas
* Coal gasification
* Underground coal gasification
* Biogas
* Blast furnace gas
* Blau gas
* Gasification
* Landfill gas
* Mond gas
* Pintsch gas
* Producer gas
* Regasification
* Syngas
* Water gas
* Wood gas

|

Natural gas|

* APG
* CBM
* CNG
* HCNG
* LNG
* NGC
* SNG
* Bio-SNG

LPG|

* Autogas
* Butane
* Propane

Infrastructure|

* Compressor station
* Gas carrier
* Gas holder
* Gas meter
* Gasworks
* Natural-gas processing
* Natural gas storage
* Odorizer
* Pipeline transport

Uses|

* Bunsen burner
* Gas burner
* Gas engine
* Gas heater
* Gas lighting
* Gas mantle
* Gas stove
* Gas turbine
* Pilot light

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